CN117023899B - Livestock breeding sewage purification treatment process - Google Patents
Livestock breeding sewage purification treatment process Download PDFInfo
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- CN117023899B CN117023899B CN202311145901.5A CN202311145901A CN117023899B CN 117023899 B CN117023899 B CN 117023899B CN 202311145901 A CN202311145901 A CN 202311145901A CN 117023899 B CN117023899 B CN 117023899B
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000008569 process Effects 0.000 title claims abstract description 28
- 238000000746 purification Methods 0.000 title claims abstract description 16
- 244000144972 livestock Species 0.000 title abstract description 10
- 238000009395 breeding Methods 0.000 title abstract description 7
- 230000001488 breeding effect Effects 0.000 title abstract description 7
- 239000007788 liquid Substances 0.000 claims abstract description 63
- 238000000855 fermentation Methods 0.000 claims abstract description 49
- 230000004151 fermentation Effects 0.000 claims abstract description 49
- 238000005189 flocculation Methods 0.000 claims abstract description 44
- 230000016615 flocculation Effects 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000000926 separation method Methods 0.000 claims abstract description 25
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- 238000001179 sorption measurement Methods 0.000 claims abstract description 16
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- 239000002351 wastewater Substances 0.000 claims abstract description 11
- 241000894006 Bacteria Species 0.000 claims abstract description 10
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 74
- 238000002791 soaking Methods 0.000 claims description 23
- 238000002360 preparation method Methods 0.000 claims description 22
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 21
- 239000007858 starting material Substances 0.000 claims description 21
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 20
- 239000000725 suspension Substances 0.000 claims description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 244000063299 Bacillus subtilis Species 0.000 claims description 16
- 235000014469 Bacillus subtilis Nutrition 0.000 claims description 16
- 230000002906 microbiologic effect Effects 0.000 claims description 16
- 241000589516 Pseudomonas Species 0.000 claims description 14
- 239000003463 adsorbent Substances 0.000 claims description 14
- 239000003513 alkali Substances 0.000 claims description 14
- 239000000706 filtrate Substances 0.000 claims description 14
- 230000001580 bacterial effect Effects 0.000 claims description 12
- 239000002253 acid Substances 0.000 claims description 11
- 239000012535 impurity Substances 0.000 claims description 11
- 230000007935 neutral effect Effects 0.000 claims description 11
- 238000001354 calcination Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 238000002386 leaching Methods 0.000 claims description 10
- 238000007873 sieving Methods 0.000 claims description 10
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 8
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 8
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 8
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 7
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 7
- 230000003213 activating effect Effects 0.000 claims description 7
- 239000002585 base Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 7
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- 229920002401 polyacrylamide Polymers 0.000 claims description 7
- 235000010413 sodium alginate Nutrition 0.000 claims description 7
- 239000000661 sodium alginate Substances 0.000 claims description 7
- 229940005550 sodium alginate Drugs 0.000 claims description 7
- 230000001954 sterilising effect Effects 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 239000006228 supernatant Substances 0.000 claims description 7
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 6
- 238000012258 culturing Methods 0.000 claims description 6
- 239000008363 phosphate buffer Substances 0.000 claims description 5
- 241001259677 Pseudomonas guguanensis Species 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 abstract description 7
- 231100000719 pollutant Toxicity 0.000 abstract description 7
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- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000000813 microbial effect Effects 0.000 abstract description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 26
- 230000000052 comparative effect Effects 0.000 description 14
- 241001465754 Metazoa Species 0.000 description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 12
- 230000000694 effects Effects 0.000 description 10
- 239000000203 mixture Substances 0.000 description 8
- 229940041514 candida albicans extract Drugs 0.000 description 6
- 230000000249 desinfective effect Effects 0.000 description 6
- 239000012153 distilled water Substances 0.000 description 6
- 239000002609 medium Substances 0.000 description 6
- 239000011780 sodium chloride Substances 0.000 description 6
- 239000012137 tryptone Substances 0.000 description 6
- 239000012138 yeast extract Substances 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000005909 Kieselgur Substances 0.000 description 4
- 210000003608 fece Anatomy 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 239000010871 livestock manure Substances 0.000 description 3
- 244000144977 poultry Species 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 2
- 235000010855 food raising agent Nutrition 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
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- 150000004676 glycans Chemical class 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/14—Diatomaceous earth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3021—Milling, crushing or grinding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3078—Thermal treatment, e.g. calcining or pyrolizing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3085—Chemical treatments not covered by groups B01J20/3007 - B01J20/3078
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
- C02F3/1226—Particular type of activated sludge processes comprising an absorbent material suspended in the mixed liquor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/348—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the way or the form in which the microorganisms are added or dosed
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Geochemistry & Mineralogy (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a livestock breeding sewage purification treatment process, and belongs to the technical field of environmental protection. The purification treatment process comprises the steps of solid-liquid separation, acid-base regulation, fermentation treatment, flocculation treatment, solid-liquid separation, disinfection and the like. Firstly, preliminarily filtering to remove suspended solid matters in livestock-raising wastewater, then adding a composite microbial agent for mixed fermentation, mixing the two bacteria in equal proportion, and then carrying out symbiotic cooperation and mutual promotion to realize the preliminary purification of main pollutants such as ammonia nitrogen in water; the sewage after fermentation treatment is further treated by using a composite flocculant, so that the efficient adsorption and fixation of pollutants in the sewage are realized; finally, secondary solid-liquid separation and disinfection treatment are carried out, and sewage is thoroughly purified.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a livestock breeding sewage purification treatment process.
Background
The development speed of animal husbandry in China is steadily improved, and the total yield of animal husbandry products and the occupation amount of people are obviously increased. The development of animal husbandry gradually develops to large-scale, intensive and factory-like from original extensive, small-sized and decentralized animal husbandry, so that a large number of livestock and poultry are raised together in a centralized mode, a large amount of animal excreta and various sewage can cause serious pollution to surrounding natural environment and ecological environment, if the environment is not timely and reasonably solved, only more serious environmental problems are caused, and not only economic development is hindered, but also survival of people is threatened.
The sewage on the animal farm mainly comes from the excrement of animals, and various sterilized, cleaned and scrubbed sewage on the animal farm. Animal manure without treatment is decomposed through chemical reaction under anaerobic condition to generate a large amount of organic matters, heavy metals, pathogenic bacteria and microorganisms such as phenols and amine organic matters, which pollute drinking water sources to deteriorate water quality and further cause harm to health of livestock and poultry and human bodies. Due to the rapid large-scale development of animal husbandry, the number of the concentrated livestock and poultry raising is increased, and various pollutants are also increased. However, due to the driving of benefits, a plurality of livestock farms are not visible to the problem. The large amount of excrement and urine are piled up anywhere, sewage is discharged in disorder, and sanitation and disinfection of a farm are not taken into account, so that a sanitation and epidemic prevention system of the whole animal farm is paralyzed, the balance of the environment and an ecological system is seriously destroyed, and sustainable development of the animal farm is also hindered.
A plurality of farms adopt a water-flushing and manure-cleaning process, the flushing time is concentrated, the waste water amount is large, more manure is carried, the concentration of pollutants is high, and the treatment difficulty is high. In addition, some devices are used in the prior art to treat sewage, for example, patents with publication numbers of CN112591819A, CN110282822A and the like, but the technologies all depend on complex devices to treat sewage, so that the treatment difficulty and the treatment cost are increased, the market application rate is low, and the effective implementation cannot be realized. The sewage treatment modes of the breeding industry in the world can be summarized into two modes: one is a returning mode aiming at resource utilization, and the other is a manual strengthening treatment mode aiming at standard emission. The Chinese large-scale farms are generally concentrated in suburbs, insufficient land is available for absorbing manure, a returning mode is inconvenient to use, and most of the Chinese large-scale farms are manually reinforced by combining fermentation treatment and other methods. The sewage is fermented to remove most of organic matters, but the indexes such as N, P and COD are still high. If a large amount of high-concentration effluent water which is not subjected to subsequent treatment is directly discharged, huge harm to the environment is necessarily caused.
Therefore, the search for a simple and efficient sewage treatment agent is a technical problem to be solved urgently at present.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a novel livestock-raising sewage purification treatment process, which realizes the efficient purification of pollutants in the livestock-raising sewage in a mode of combining biological treatment and chemical adsorption.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the livestock-raising sewage purifying treatment process comprises the following treatment steps:
(1) Solid-liquid separation; performing preliminary filtration on the sewage to remove solid suspended matters in the sewage, so as to obtain primary filtrate;
(2) Acid-base regulation: after the pH value of the primary filtrate is regulated to 6.8-7.2 by alkali liquor, the sewage to be treated is led to a flocculation tank;
(3) Fermentation treatment: adding a biological starter into a flocculation tank for fermentation to obtain fermentation liquor;
(4) Flocculation treatment: after fermentation is completed, adding a composite flocculation adsorbent into fermentation liquor according to a solid-to-liquid ratio of 10-20 g/ton, wherein the treatment time of flocculation adsorption treatment is 30-60min, and continuously stirring in the treatment process;
(5) Solid-liquid separation: carrying out solid-liquid separation on the flocculated wastewater by a continuous centrifuge to obtain solid and separated liquid, and discharging the separated liquid to a water collecting tank;
(6) And (3) disinfection: and finally disinfecting the separating liquid by utilizing ultraviolet rays or ozone.
Further, the alkali liquor in the step (2) is sodium hydroxide solution and/or potassium hydroxide solution, and the molar concentration is 1-3mol/L.
Further, the addition amount of the biological leavening agent in the step (3) is 100-300mL/m 3 The fermentation time is 24-36h; the preparation method of the biological starter comprises the following steps: activating two strains of Bacillus subtilis (Bacillus subtilis) and Pseudomonas glutinosa (Pseudomonas guguanensis), inoculating to LB culture medium, shake culturing at 30deg.C for 24 hr/min for 5min under constant temperature of 4000r/min, centrifuging, removing supernatant, collecting thallus, adding phosphate buffer to make thallus concentration of suspension reach 2×10 9 CFU/mL, obtaining bacterial suspension, and mixing the bacterial suspensions of the two bacteria according to the volume ratio of 1:1 to obtain the biological starter.
The composition of the LB medium was: yeast extract 5g, tryptone 10g, sodium chloride 10g, distilled water 1000mL, pH 7.0; and steam sterilizing at 121deg.C for 20min.
Further, the bacillus subtilis is purchased from China General Microbiological Collection Center (CGMCC) 1.8955, and the original collection date is 2009, 2 months and 26 days; the Pseudomonas glutinosa is purchased from China general microbiological collection center, the collection number is CGMCC1.15627, and the original collection date is 2015, 2 months and 25 days.
Both strains related by the invention can be purchased through an ordering flow in the China general microbiological preservation management center.
Further, the composition of the composite flocculation adsorbent is as follows: 8-10 parts of polymeric ferric sulfate, 4-6 parts of polymeric aluminum sulfate, 8-10 parts of polyacrylamide, 4-8 parts of modified diatomite and 1-3 parts of sodium alginate.
Further, the preparation method of the modified diatomite comprises the following steps:
(1) Removing impurities from natural diatomite, crushing, sieving with a 200-mesh sieve, placing in a muffle furnace, calcining for 2 hours, cooling, and then, according to the solid-to-liquid ratio of 100g:1L is subjected to acid leaching for 6 hours by using a sulfuric acid solution with the mass concentration of 25 percent, and is washed by water until the pH value is neutral, so as to obtain pretreated diatomite;
(2) Sequentially soaking pretreated diatomite into nano silica sol solution with mass concentration of 3-5%, 10-12% and 20-22% for 1h, and fully drying after soaking to obtain the modified diatomite.
The average grain diameter of the nano silica sol is not more than 1 mu m.
Advantageous effects
(1) Firstly, primarily filtering to remove suspended solid matters in livestock breeding wastewater, and regulating the pH value of the system to be neutral. Secondly, adding a compound microbial agent for mixed fermentation, wherein the selected bacillus subtilis can utilize organic matters in a water body to carry out photosynthesis, so that COD and N, P content in the water body are reduced, the Pseudomonas glutinosa can degrade COD and N, P, and the secreted polymer substances are generally composed of polysaccharide substances, protein and lipid substances, and a large number of adsorption active groups are contained in molecules, so that a better adsorption effect on heavy metal ions in sewage can be generated, and after the two bacteria are mixed in equal proportion, the two bacteria are in symbiotic cooperation and mutual promotion, so that the functions of single bacteria are integrated, the cooperative symbiotic effect among the bacteria is increased, the pH of the water body can be stabilized, and the dissolved oxygen and transparency of the water body are improved;
(2) The sewage after fermentation treatment is further treated by using a composite flocculant, and the added polymeric ferric sulfate and polymeric aluminum sulfate cooperate with the formed floccule to carry out adsorption sedimentation on inorganic matters and organic matters of the sewage, so as to enhance flocculation; meanwhile, modified diatomite is added, and the modified diatomite is utilized to efficiently adsorb and fix pollutants in water. However, although diatomaceous earth has the characteristics of large specific surface area, high void fraction, strong adsorptivity, high chemical stability, low price, etc., the adsorption performance of natural diatomaceous earth is poor, and further improvement of adsorption performance by modification and loading of other materials is required. The method removes surface impurities of natural diatomite by acid etching, opens the surface and internal gaps of the diatomite, treats the diatomite by treating silica sol from low concentration to high concentration, ensures that the nano silica sol has extremely high adsorptivity and catalysis, can be fully adsorbed on the surface of the diatomite and the surface of an internal pore canal, increases the adsorption activity of the diatomite on one hand, can play a supporting role on the other hand, increases the strength, and finally realizes the efficient adsorption and fixation of pollutants in sewage;
(3) Finally, secondary solid-liquid separation and disinfection treatment are carried out, and sewage is thoroughly purified.
Drawings
FIG. 1 is a microscopic image of the diatomaceous earth of the present invention, wherein (a) is natural diatomaceous earth and (b-c) is modified diatomaceous earth obtained in example 3 of the present invention.
Detailed Description
The technical scheme of the present invention is further described below with reference to specific examples, but is not limited thereto.
Example 1
The livestock-raising sewage purifying treatment process comprises the following treatment steps:
(1) Solid-liquid separation; performing preliminary filtration on the sewage to remove solid suspended matters in the sewage, so as to obtain primary filtrate;
(2) Acid-base regulation: after the pH value of the primary filtrate is regulated to 6.8-7.2 by alkali liquor, the sewage to be treated is led to a flocculation tank;
(3) Fermentation treatment: adding a biological starter into a flocculation tank for fermentation to obtain fermentation liquor;
(4) Flocculation treatment: after fermentation is completed, adding a composite flocculation adsorbent into fermentation liquor according to a solid-to-liquid ratio of 10 g/ton, wherein the treatment time of flocculation adsorption treatment is 30min, and continuously stirring in the treatment process;
(5) Solid-liquid separation: carrying out solid-liquid separation on the flocculated wastewater by a continuous centrifuge to obtain solid and separated liquid, and discharging the separated liquid to a water collecting tank;
(6) And (3) disinfection: and finally disinfecting the separating liquid by utilizing ultraviolet rays or ozone.
The alkali liquor in the step (2) is sodium hydroxide solution, and the molar concentration is 1mol/L.
The addition amount of the biological leavening agent in the step (3) is 100mL/m 3 The fermentation time is 24 hours; the preparation method of the biological starter comprises the following steps: activating two strains of Bacillus subtilis and Pseudomonas glutinosa, inoculating to LB culture medium, shake culturing at constant temperature of 30deg.C for 24 hr at 200r/min for 5min, centrifuging at 4000r/min, removing supernatant, collecting thallus, adding phosphate buffer to make thallus concentration of suspension reach 2×10 9 CFU/mL, obtaining bacterial suspension, and mixing the bacterial suspensions of the two bacteria according to the volume ratio of 1:1 to obtain the biological starter.
The composition of the LB medium was: yeast extract 5g, tryptone 10g, sodium chloride 10g, distilled water 1000mL, pH 7.0; and steam sterilizing at 121deg.C for 20min.
The bacillus subtilis is purchased from China General Microbiological Collection Center (CGMCC) 1.8955, and the original collection date is 2009, 2 months and 26 days; the Pseudomonas glutinosa is purchased from China general microbiological collection center, the collection number is CGMCC1.15627, and the original collection date is 2015, 2 months and 25 days.
Both strains related to this example can be purchased openly through the ordering process in the China general microbiological preservation management center.
The composite flocculation adsorbent comprises the following components: 8 parts of polymeric ferric sulfate, 4 parts of polymeric aluminum sulfate, 8 parts of polyacrylamide, 4 parts of modified diatomite and 1 part of sodium alginate.
The preparation method of the modified diatomite comprises the following steps:
(1) Removing impurities from natural diatomite, crushing, sieving with a 200-mesh sieve, placing in a muffle furnace, calcining for 2 hours, cooling, and then, according to the solid-to-liquid ratio of 100g:1L is subjected to acid leaching for 6 hours by using a sulfuric acid solution with the mass concentration of 25 percent, and is washed by water until the pH value is neutral, so as to obtain pretreated diatomite;
(2) Sequentially soaking pretreated diatomite into nano silica sol solution with mass concentration of 3-5%, 10-12% and 20-22% for 1h, and fully drying after soaking to obtain the modified diatomite.
The average grain diameter of the nano silica sol is not more than 1 mu m.
Example 2
The livestock-raising sewage purifying treatment process comprises the following treatment steps:
(1) Solid-liquid separation; performing preliminary filtration on the sewage to remove solid suspended matters in the sewage, so as to obtain primary filtrate;
(2) Acid-base regulation: after the pH value of the primary filtrate is regulated to 6.8-7.2 by alkali liquor, the sewage to be treated is led to a flocculation tank;
(3) Fermentation treatment: adding a biological starter into a flocculation tank for fermentation to obtain fermentation liquor;
(4) Flocculation treatment: after fermentation is completed, adding a composite flocculation adsorbent into fermentation liquor according to a solid-to-liquid ratio of 15 g/ton, wherein the treatment time of flocculation adsorption treatment is 40min, and continuously stirring in the treatment process;
(5) Solid-liquid separation: carrying out solid-liquid separation on the flocculated wastewater by a continuous centrifuge to obtain solid and separated liquid, and discharging the separated liquid to a water collecting tank;
(6) And (3) disinfection: and finally disinfecting the separating liquid by utilizing ultraviolet rays or ozone.
The alkali liquor in the step (2) is potassium hydroxide solution, and the molar concentration is 2mol/L.
The addition amount of the biological leaven in the step (3) is 200mL/m 3 The fermentation time is 30 hours; the preparation method of the biological starter comprises the following steps: activating two strains of Bacillus subtilis and Pseudomonas glutinosa, inoculating to LB culture medium, shake culturing at constant temperature of 30deg.C for 24 hr at 200r/min for 5min, centrifuging at 4000r/min, removing supernatant, collecting thallus, adding phosphate buffer to make thallus concentration of suspension reach 2×10 9 CFU/mL, obtaining bacterial suspension, and mixing the bacterial suspensions of the two bacteria according to the volume ratio of 1:1 to obtain the biological starter.
The composition of the LB medium was: yeast extract 5g, tryptone 10g, sodium chloride 10g, distilled water 1000mL, pH 7.0; and steam sterilizing at 121deg.C for 20min.
The bacillus subtilis is purchased from China General Microbiological Collection Center (CGMCC) 1.8955, and the original collection date is 2009, 2 months and 26 days; the Pseudomonas glutinosa is purchased from China general microbiological collection center, the collection number is CGMCC1.15627, and the original collection date is 2015, 2 months and 25 days.
Both strains related to this example can be purchased openly through the ordering process in the China general microbiological preservation management center.
The composite flocculation adsorbent comprises the following components: 9 parts of polymeric ferric sulfate, 5 parts of polymeric aluminum sulfate, 9 parts of polyacrylamide, 6 parts of modified diatomite and 2 parts of sodium alginate.
The preparation method of the modified diatomite comprises the following steps:
(1) Removing impurities from natural diatomite, crushing, sieving with a 200-mesh sieve, placing in a muffle furnace, calcining for 2 hours, cooling, and then, according to the solid-to-liquid ratio of 100g:1L is subjected to acid leaching for 6 hours by using a sulfuric acid solution with the mass concentration of 25 percent, and is washed by water until the pH value is neutral, so as to obtain pretreated diatomite;
(2) Sequentially soaking pretreated diatomite into nano silica sol solution with mass concentration of 3-5%, 10-12% and 20-22% for 1h, and fully drying after soaking to obtain the modified diatomite.
The average grain diameter of the nano silica sol is not more than 1 mu m.
Example 3
The livestock-raising sewage purifying treatment process comprises the following treatment steps:
(1) Solid-liquid separation; performing preliminary filtration on the sewage to remove solid suspended matters in the sewage, so as to obtain primary filtrate;
(2) Acid-base regulation: after the pH value of the primary filtrate is regulated to 6.8-7.2 by alkali liquor, the sewage to be treated is led to a flocculation tank;
(3) Fermentation treatment: adding a biological starter into a flocculation tank for fermentation to obtain fermentation liquor;
(4) Flocculation treatment: after fermentation is completed, adding a composite flocculation adsorbent into fermentation liquor according to a solid-to-liquid ratio of 20 g/ton, wherein the treatment time of flocculation adsorption treatment is 60min, and continuously stirring in the treatment process;
(5) Solid-liquid separation: carrying out solid-liquid separation on the flocculated wastewater by a continuous centrifuge to obtain solid and separated liquid, and discharging the separated liquid to a water collecting tank;
(6) And (3) disinfection: and finally disinfecting the separating liquid by utilizing ultraviolet rays or ozone.
The alkali liquor in the step (2) is sodium hydroxide solution and/or potassium hydroxide solution, and the molar concentration is 3mol/L.
The addition amount of the biological leaven in the step (3) is 300mL/m 3 The fermentation time is 36h; the preparation method of the biological starter comprises the following steps: activating two strains of Bacillus subtilis and Pseudomonas glutinosa, inoculating to LB culture medium, shake culturing at constant temperature of 30deg.C for 24 hr at 200r/min for 5min, centrifuging at 4000r/min, removing supernatant, collecting thallus, adding phosphate buffer to make thallus concentration of suspension reach 2×10 9 CFU/mL, obtaining bacterial suspension, and mixing the bacterial suspensions of the two bacteria according to the volume ratio of 1:1 to obtain the biological starter.
The composition of the LB medium was: yeast extract 5g, tryptone 10g, sodium chloride 10g, distilled water 1000mL, pH 7.0; and steam sterilizing at 121deg.C for 20min.
The bacillus subtilis is purchased from China General Microbiological Collection Center (CGMCC) 1.8955, and the original collection date is 2009, 2 months and 26 days; the Pseudomonas glutinosa is purchased from China general microbiological collection center, the collection number is CGMCC1.15627, and the original collection date is 2015, 2 months and 25 days.
Both strains related to this example can be purchased openly through the ordering process in the China general microbiological preservation management center.
The composite flocculation adsorbent comprises the following components: 10 parts of polymeric ferric sulfate, 6 parts of polymeric aluminum sulfate, 10 parts of polyacrylamide, 8 parts of modified diatomite and 3 parts of sodium alginate.
The preparation method of the modified diatomite comprises the following steps:
(1) Removing impurities from natural diatomite, crushing, sieving with a 200-mesh sieve, placing in a muffle furnace, calcining for 2 hours, cooling, and then, according to the solid-to-liquid ratio of 100g:1L is subjected to acid leaching for 6 hours by using a sulfuric acid solution with the mass concentration of 25 percent, and is washed by water until the pH value is neutral, so as to obtain pretreated diatomite;
(2) Sequentially soaking pretreated diatomite into nano silica sol solution with mass concentration of 3-5%, 10-12% and 20-22% for 1h, and fully drying after soaking to obtain the modified diatomite.
The average grain diameter of the nano silica sol is not more than 1 mu m.
Comparative example 1
The livestock-raising sewage purifying treatment process comprises the following treatment steps:
(1) Solid-liquid separation; performing preliminary filtration on the sewage to remove solid suspended matters in the sewage, so as to obtain primary filtrate;
(2) Acid-base regulation: after the pH value of the primary filtrate is regulated to 6.8-7.2 by alkali liquor, the sewage to be treated is led to a flocculation tank;
(3) Fermentation treatment: adding a biological starter into a flocculation tank for fermentation to obtain fermentation liquor;
(4) Flocculation treatment: after fermentation is completed, adding a composite flocculation adsorbent into fermentation liquor according to a solid-to-liquid ratio of 20 g/ton, wherein the treatment time of flocculation adsorption treatment is 60min, and continuously stirring in the treatment process;
(5) Solid-liquid separation: carrying out solid-liquid separation on the flocculated wastewater by a continuous centrifuge to obtain solid and separated liquid, and discharging the separated liquid to a water collecting tank;
(6) And (3) disinfection: and finally disinfecting the separating liquid by utilizing ultraviolet rays or ozone.
The alkali liquor in the step (2) is sodium hydroxide solution and/or potassium hydroxide solution, and the molar concentration is 3mol/L.
The addition amount of the biological leaven in the step (3) is 300mL/m 3 The fermentation time is 36h; the preparation method of the biological starter comprises the following steps: activating bacillus subtilis strain, inoculating to LB culture medium, shake culturing at 30deg.C for 24 hr at 200r/min for 5min, centrifuging at 4000r/min, removing supernatant, collecting thallus, adding phosphate buffer solution to make thallus concentration of suspension reach 2×10 9 CFU/mL to obtain bacterial suspension, namely the biological starter.
The composition of the LB medium was: yeast extract 5g, tryptone 10g, sodium chloride 10g, distilled water 1000mL, pH 7.0; and steam sterilizing at 121deg.C for 20min.
The bacillus subtilis is purchased from China General Microbiological Collection Center (CGMCC) 1.8955, and the original collection date is 2009, 2 months and 26 days.
The composite flocculation adsorbent comprises the following components: 10 parts of polymeric ferric sulfate, 6 parts of polymeric aluminum sulfate, 10 parts of polyacrylamide, 8 parts of modified diatomite and 3 parts of sodium alginate.
The preparation method of the modified diatomite comprises the following steps:
(1) Removing impurities from natural diatomite, crushing, sieving with a 200-mesh sieve, placing in a muffle furnace, calcining for 2 hours, cooling, and then, according to the solid-to-liquid ratio of 100g:1L is subjected to acid leaching for 6 hours by using a sulfuric acid solution with the mass concentration of 25 percent, and is washed by water until the pH value is neutral, so as to obtain pretreated diatomite;
(2) Sequentially soaking pretreated diatomite into nano silica sol solution with mass concentration of 3-5%, 10-12% and 20-22% for 1h, and fully drying after soaking to obtain the modified diatomite.
The average grain diameter of the nano silica sol is not more than 1 mu m.
In this comparative example, the raw materials and the preparation process were the same as in example 3, except that only Bacillus subtilis was used in the biological agent.
Comparative example 2
The livestock-raising sewage purifying treatment process comprises the following treatment steps:
(1) Solid-liquid separation; performing preliminary filtration on the sewage to remove solid suspended matters in the sewage, so as to obtain primary filtrate;
(2) Acid-base regulation: after the pH value of the primary filtrate is regulated to 6.8-7.2 by alkali liquor, the sewage to be treated is led to a flocculation tank;
(3) Fermentation treatment: adding a biological starter into a flocculation tank for fermentation to obtain fermentation liquor;
(4) Flocculation treatment: after fermentation is completed, adding a composite flocculation adsorbent into fermentation liquor according to a solid-to-liquid ratio of 20 g/ton, wherein the treatment time of flocculation adsorption treatment is 60min, and continuously stirring in the treatment process;
(5) Solid-liquid separation: carrying out solid-liquid separation on the flocculated wastewater by a continuous centrifuge to obtain solid and separated liquid, and discharging the separated liquid to a water collecting tank;
(6) And (3) disinfection: and finally disinfecting the separating liquid by utilizing ultraviolet rays or ozone.
The alkali liquor in the step (2) is sodium hydroxide solution and/or potassium hydroxide solution, and the molar concentration is 3mol/L.
The addition amount of the biological leaven in the step (3) is 300mL/m 3 The fermentation time is 36h; the preparation method of the biological starter comprises the following steps: activating two strains of Pseudomonas glutinosa, inoculating to LB culture medium, centrifuging at 200deg.C for 24 hr/min under shaking culture at 30deg.C for 5min, removing supernatant, collecting thallus, adding phosphate buffer solution to make thallus concentration of suspension reach 2×10 9 CFU/mL to obtain bacterial suspension, namely the biological starter.
The composition of the LB medium was: yeast extract 5g, tryptone 10g, sodium chloride 10g, distilled water 1000mL, pH 7.0; and steam sterilizing at 121deg.C for 20min.
The Pseudomonas glutinosa is purchased from China general microbiological collection center, the collection number is CGMCC1.15627, and the original collection date is 2015, 2 months and 25 days.
The composite flocculation adsorbent comprises the following components: 10 parts of polymeric ferric sulfate, 6 parts of polymeric aluminum sulfate, 10 parts of polyacrylamide, 8 parts of modified diatomite and 3 parts of sodium alginate.
The preparation method of the modified diatomite comprises the following steps:
(1) Removing impurities from natural diatomite, crushing, sieving with a 200-mesh sieve, placing in a muffle furnace, calcining for 2 hours, cooling, and then, according to the solid-to-liquid ratio of 100g:1L is subjected to acid leaching for 6 hours by using a sulfuric acid solution with the mass concentration of 25 percent, and is washed by water until the pH value is neutral, so as to obtain pretreated diatomite;
(2) Sequentially soaking pretreated diatomite into nano silica sol solution with mass concentration of 3-5%, 10-12% and 20-22% for 1h, and fully drying after soaking to obtain the modified diatomite.
The average grain diameter of the nano silica sol is not more than 1 mu m.
In this comparative example, the raw materials and the preparation process were the same as in example 3, except that only Pseudomonas glutinosa was used in the biological starter.
Comparative example 3
This comparative example was the same as example 3 except that only a nano silica sol solution having a mass concentration of 3 to 5% was used for the treatment in the preparation of the modified diatomaceous earth. The method comprises the following steps:
the preparation method of the modified diatomite comprises the following steps:
(1) Removing impurities from natural diatomite, crushing, sieving with a 200-mesh sieve, placing in a muffle furnace, calcining for 2 hours, cooling, and then, according to the solid-to-liquid ratio of 100g:1L is subjected to acid leaching for 6 hours by using a sulfuric acid solution with the mass concentration of 25 percent, and is washed by water until the pH value is neutral, so as to obtain pretreated diatomite;
(2) Sequentially soaking pretreated diatomite in a nano silica sol solution with the mass concentration of 3-5%, wherein the soaking time is 1h, and fully drying after the soaking is finished to obtain the modified diatomite.
Comparative example 4
This comparative example was the same as example 3 except that in the preparation of modified diatomaceous earth, only a 10-12% by mass nano silica sol solution was used for the treatment. The method comprises the following steps:
the preparation method of the modified diatomite comprises the following steps:
(1) Removing impurities from natural diatomite, crushing, sieving with a 200-mesh sieve, placing in a muffle furnace, calcining for 2 hours, cooling, and then, according to the solid-to-liquid ratio of 100g:1L is subjected to acid leaching for 6 hours by using a sulfuric acid solution with the mass concentration of 25 percent, and is washed by water until the pH value is neutral, so as to obtain pretreated diatomite;
(2) Sequentially soaking pretreated diatomite into a nano silica sol solution with the mass concentration of 10-12%, wherein the soaking time is 1h, and fully drying after the soaking is finished to obtain the modified diatomite.
Comparative example 5
This comparative example was the same as example 3 except that in the preparation of modified diatomaceous earth, only a nano silica sol solution having a mass concentration of 20 to 22% was used for the treatment. The method comprises the following steps:
the preparation method of the modified diatomite comprises the following steps:
(1) Removing impurities from natural diatomite, crushing, sieving with a 200-mesh sieve, placing in a muffle furnace, calcining for 2 hours, cooling, and then, according to the solid-to-liquid ratio of 100g:1L is subjected to acid leaching for 6 hours by using a sulfuric acid solution with the mass concentration of 25 percent, and is washed by water until the pH value is neutral, so as to obtain pretreated diatomite;
(2) Sequentially soaking pretreated diatomite into a nano silica sol solution with the mass concentration of 20-22%, wherein the soaking time is 1h, and fully drying after the soaking is finished to obtain the modified diatomite.
Performance testing
Experimental verification of the purification Effect of the Process of examples 1-3 and comparative examples 1-5
Cultivation sewage for test
The water sample is taken from a large pig farm in Yi-Lin-city, mengyin county in Shandong province
Detection method
The water quality index is detected according to the national standard method, and is specifically shown in table 1:
TABLE 1 Water quality measurement index and method
The water quality of the culture wastewater treated according to the above examples and comparative examples was measured, and the results are shown in Table 2:
TABLE 2 Water purification effect
As can be seen from the data in Table 2, the treatment process of the embodiment of the invention has good purification effect on the livestock-raising sewage, while the comparative examples 1-2 with changed strain composition and the comparative examples 3-5 with changed diatomite treatment process have reduced purification effect due to disappearance of synergy among strains and incomplete diatomite modification. The process steps and the selection of raw materials are critical to realizing the efficient purification effect of the livestock breeding sewage, and the lack of the efficient purification effect is weak.
It should be noted that the above-mentioned embodiments are merely some, but not all embodiments of the preferred mode of carrying out the invention. It is evident that all other embodiments obtained by a person skilled in the art without making any inventive effort, based on the above-described embodiments of the invention, shall fall within the scope of protection of the invention.
Claims (2)
1. The livestock-raising sewage purification treatment process is characterized by comprising the following treatment steps:
(1) Solid-liquid separation; performing preliminary filtration on the sewage to remove solid suspended matters in the sewage, so as to obtain primary filtrate;
(2) Acid-base regulation: after the pH value of the primary filtrate is regulated to 6.8-7.2 by alkali liquor, the sewage to be treated is led to a flocculation tank;
(3) Fermentation treatment: adding a biological starter into a flocculation tank for fermentation to obtain fermentation liquor;
(4) Flocculation treatment: after fermentation is completed, adding a composite flocculation adsorbent into fermentation liquor according to a solid-to-liquid ratio of 10-20 g/ton, wherein the treatment time of flocculation adsorption treatment is 30-60min, and continuously stirring in the treatment process;
(5) Solid-liquid separation: carrying out solid-liquid separation on the flocculated wastewater by a continuous centrifuge to obtain solid and separated liquid, and discharging the separated liquid to a water collecting tank;
(6) And (3) disinfection: finally sterilizing the separating liquid by utilizing ultraviolet rays or ozone;
the addition amount of the biological leaven in the step (3) is 100-300mL/m 3 The fermentation time is 24-36h; the preparation method of the biological starter comprises the following steps: activating two strains of Bacillus subtilis (Bacillus subtilis) and Pseudomonas glutinosa (Pseudomonas guguanensis), inoculating to LB culture medium, shake culturing at 30deg.C for 24 hr/min for 5min under constant temperature of 4000r/min, centrifuging, removing supernatant, collecting thallus, adding phosphate buffer to make thallus concentration of suspension reach 2×10 9 CFU/mL is adopted to obtain bacterial suspension, and then the bacterial suspension of the two bacteria is mixed according to the volume ratio of 1:1 to obtain the biological fermentation agent;
the bacillus subtilis is purchased from China General Microbiological Collection Center (CGMCC) 1.8955; the Pseudomonas glutinosa is purchased from China general microbiological collection center, and the collection number is CGMCC1.15627;
the composite flocculation adsorbent comprises the following components: 8-10 parts of polymeric ferric sulfate, 4-6 parts of polymeric aluminum sulfate, 8-10 parts of polyacrylamide, 4-8 parts of modified diatomite and 1-3 parts of sodium alginate;
the preparation method of the modified diatomite comprises the following steps:
(1) Removing impurities from natural diatomite, crushing, sieving with a 200-mesh sieve, placing in a muffle furnace, calcining for 2 hours, cooling, and then, according to the solid-to-liquid ratio of 100g:1L is subjected to acid leaching for 6 hours by using a sulfuric acid solution with the mass concentration of 25 percent, and is washed by water until the pH value is neutral, so as to obtain pretreated diatomite;
(2) Sequentially soaking pretreated diatomite into nano silica sol solution with mass concentration of 3-5%, 10-12% and 20-22% for 1h, and fully drying after soaking to obtain the modified diatomite.
2. The livestock-raising sewage purification treatment process according to claim 1, wherein the alkali liquor in the step (2) is sodium hydroxide solution and/or potassium hydroxide solution, and the molar concentration is 1-3mol/L.
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| CN108439695A (en) * | 2018-03-02 | 2018-08-24 | 云南龙帜环境工程有限公司 | A kind of livestock breeding wastewater integral treatment method |
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