CN103771675A - Method for treating sludge from urban sewage plant to obtain land utilization mud - Google Patents
Method for treating sludge from urban sewage plant to obtain land utilization mud Download PDFInfo
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- CN103771675A CN103771675A CN201310722324.1A CN201310722324A CN103771675A CN 103771675 A CN103771675 A CN 103771675A CN 201310722324 A CN201310722324 A CN 201310722324A CN 103771675 A CN103771675 A CN 103771675A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/20—Sludge processing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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Abstract
The invention discloses a method for treating sludge from an urban sewage plant to obtain land utilization mud. The method comprises the steps: heating the weighed HMF (Hydroxymethyl-furfural) heavy metal curing agent to 100-150 DEG C through a spiral conveyor, feeding the HMF heavy metal curing agent into a mixing machine, and sufficiently mixing the HMF heavy metal curing agent and sludge; then, feeding the mixture into a sunlight fermentation tank, spraying aerobic fermentation bacteria, and carrying out aerobic fermentation at the temperature of 50-65 DEG C for about 10 days to enable the sludge to be sufficiently cured and dehydrated to obtain the land utilization mud up to the national standard. The mud can be used for landscaping, improving soil and producing nutrient soils for nursery stocks and flowers, organic fertilizers, controlled-release organic-inorganic compound fertilizers and the like. The method disclosed by the invention is simple in process, convenient to operate, not high in investment and cost, easy for large-scale production, free of odor and wastewater and other pollutions in the treatment process, high resident stability of heavy metals and capable of fundamentally realizing the harmless and resource utilization of the sludge from the urban sewage plant.
Description
Technical field
The invention belongs to field of environment protection, relate to a kind of sludge treatment by urban wastewater treatment firm and become the method for can soil utilizing shale.
Background technology
In the end of the year 2010, China's town domestic sewage facility processing power reached for 1.25 billion cubic meter/days.According to " " 12 " national town sewage is processed and the planning of regeneration Facilities Construction ", by 2015, wastewater treatment in China scale will reach for 2.08 billion cubic meter/days.By this estimation, the annual dewatered sludge producing can reach 1,100 ten thousand tons of left and right; Moisture 85% in mud, the actual generation of the annual mud of China reaches 7,300 ten thousand tons.
Mud is the sedimentable matter that urban wastewater treatment firm produces in sewage treatment process, the extremely complicated heterogeneous body being made up of organic relic, bacterium thalline, inorganic particle and colloid etc.Urban wastewater treatment firm mud not only water content is high, perishable, has strong odor, and the poisonous and harmful and the carcinogenic substance that contain the hard degradations such as heavy metal and Dioxins such as a large amount of pathogenic bacterias, parasitic ovum and chromium, mercury.The unprocessed random stacking of mud, through erosion and the seepage effect of rainwater, very easily causes secondary pollution to underground water, soil etc., directly harm humans health.The sharply increase of China's municipal sludge generation, is badly in need of harmless treatment and disposal of resources.Comprehensively more various sludge treating methods, the utilization of mud soil should be a most economical efficient manner.
The utilization of mud soil because of less investment, the advantage such as energy consumption is low, working cost is low, organic moiety can change into soil improvement composition, be considered to have most a kind of disposal options of development potentiality, this disposal options is land remediation and the reconstruction etc. that mud is applied to farmland, vegetable plot, orchard, meadow, municipal greening, seedling medium and serious disturbance.Scientific and reasonable soil utilization, can reduce the negative effect that mud brings, and the utilization of forest land and municipal administration greening is because being difficult for causing the pollution of food chain to become the effective means that mud soil utilizes.Mud is for reparation and the reconstruction in the soil of serious disturbance (soil that need to reclaim as mining site soil, forest harvesting field, refuse landfill, area of heavy damage, earth's surface etc.), reduce the potential threat of mud to human lives, not only disposed mud but also recovered ecotope.The utilization of mud soil is becoming the main sludge treating method in countries in the world, as the land utilization ratio of many national municipal sludges such as English, U.S., method can reach 70%, mud land utilization ratio in North America, Europe, Japan all constantly continuing to increase, and China's mud land utilization ratio is less than 10%.
In mud, contain needed other nutritive substances of abundant nitrogen, phosphorus, organic matter and plant production, but except nutritive substance, in mud, also contain the objectionable impuritiess such as organism, pathogenic bacteria, parasitic ovum and the heavy metal of some difficult degradations, can cause secondary environmental pollution if deal with improperly.Because continuous administration mud can significantly increase the heavy metal content in soil-plant system, so one of principal element that heavy metal is restriction mud soil to be utilized.Though China has promulgated the mandatory national standards of GB24188-2009 " urban wastewater treatment firm mud shales ", but because the sewage that enters Sewage Plant in cities and towns, various places is not only sanitary sewage, normally comprehensive sanitary sewage, trade effluent and the underground water three part compositions that infiltrate, source is complicated; Sewage work does not generally all have heavy metal removing system, causes heavy metal content in mud unstable or exceed standard.
Removing or reducing the heavy metal element exceeding standard in urban wastewater treatment firm mud is the necessary means of effectively disposing and utilize mud.The method of main research has at present: bioleaching, chemical method, Electroremediation method etc.Bioleaching is to utilize the distinctive oxidase system directed oxidation metal of microorganism (thiobacillus ferrooxidant) sulfide, generate the vitriol of solubility or utilize its metabolic substd to dissolve heavy metal with the product that Cucumber in mud reacts, this method is subject to the impact of bacterial classification stability, and the bioleaching residence time is long.Chemical method is to utilize various acid or organic complexing agent to sludge treatment, make to form soluble metal ion or complex compound and removal heavy metal, this method complicated operation, cost is high, nitrogen, phosphorus and organic matter in solubilized mud to a certain extent, the fertilizer efficiency of reduction mud.Electrochemical process is to utilize electric field to make heavy metal make it to move out mud by ion migration and electric osmose directional migration, energy consumption is low, repair thorough, recyclable heavy metal, but the mud high to perviousness, conductivity is poor is inapplicable, if heavy metal has been nonsoluble, electrochemical process is helpless especially.
Solidifying/stabilization technique (solidification/stabilization, abbreviation S/S technology) is widely used in heavy metal contamination site remediation and solid waste landfill disposal.For example, compared with other recovery techniques (chemical treatment, biological restoration), solidify/stabilization technique has that relative cost is lower, easy construction, foundation soil strength after treatment are high and biological degradation is had to the advantage of good obstruction.Just because of these advantages, extremely pay close attention in the world technique.Technique is applied to sewage sludge harmlessness processing, is a very tempting problem.
The in-situ passivation recovery technique of heavy-metal contaminated soil is also the focus of studying both at home and abroad.In-situ passivation recovery technique is to utilize the measures such as various chemistry, biology to change chemical form and the occurrence status of heavy metal contaminants in mud, thereby reduces biological effectiveness and the transport property of heavy metal, reduces the absorption of plant to heavy metal.In-situ passivation recovery technique is a kind of economic, efficient Pollution abatement technology, meets the needs of China's sustainable agriculture development, is subject to soil, environmentalist and pays close attention to more and more widely.
Key in passivation recovery technique is in position the selection of passivation renovation agent, and the permanent stability of heavy metal passivation must be considered.As utilize lime stabilization, and be the biological effectiveness that reduces heavy metal by improving pH value, this passivation is unsettled, once soil pH reduces by buffering or other factors, environmental risk will be reappeared.
Summary of the invention
Object of the present invention is exactly for the deficiencies in the prior art, provides a kind of urban wastewater treatment firm sludge treatment to become soil to utilize the method for shale.
Heavy Metals in urban wastewater treatment firm mud and biological effectiveness directly have influence on the security that mud soil utilizes.We are in the research of sewage sludge harmlessness, recycling, use the achievement of curing/stabilization technique and in-situ passivation recovery technique, mud is mixed, carries out high-temperature aerobic fermentation by a certain percentage with the HMF type heavy metals immobilization agent (fixative) that Yancheng City Baeyer logical sequence Environmental Protection Technology Co., Ltd researches and develops.Mud is after aerobic fermentation is processed, pathogen reduction, organic humus, heavy metal are fixed, plant can utilize form nutrient to increase, the physical behavior of mud, sanitation degree, solubleness, nutrient balance etc. are all greatly improved, product nitrogen, phosphorus, potassium total nutrient, organic content has had raising.
Technical scheme of the present invention is as follows:
Become soil to utilize a method for shale urban wastewater treatment firm sludge treatment, it comprises the following steps:
Step 1, is heated to 100～150 ℃ by the HMF type heavy metals immobilization agent measuring by spiral conveyer, sends into mixing machine, fully mixes with the mud dropping in mixing machine;
Step 2, to send in sunlight fermentation vat with metal-cured dose of mud mixing of thermogravimetric, spray aerobic beneficial microorganism microbial inoculum, maintain the temperature at and at 50～65 ℃, carry out aerobic fermentation, use turnover throwing machine scarifying material every day once, about aerobic fermentation 10 days, can make the abundant slaking of mud, dehydration, obtain qualified soil and utilize shale.
Above-mentioned soil that town sewage plant sludge treatment is become utilizes the method for shale, and in step 1, dewatered sludge is 1 ﹕ 0.25～0.5 with the massfraction ratio of HMF type heavy metals immobilization agent.
Above-mentioned becomes soil to utilize the method for shale town sewage plant sludge treatment, the soil obtaining utilizes shale to can be used for afforestation, build in forest land, the soil improvement of saltings, desertify ground and discarded mining site, can produce seedling wood flower Nutrition Soil, fertilizer, mixed organic manure, slowly-releasing organic-inorganic compound mixed fertilizer etc.
Of the present inventionly become soil to utilize the method for shale town sewage plant sludge treatment, technique is simple, easy to operate, investment and cost is not high, is easy to large-scale production, the environmental pollution such as odorless, waste water in treating processes.The most basic is that the fixing stability of heavy metal is high, process the slowly-releasing organic-inorganic compound mixed fertilizer of making after town sewage plant mud by method of the present invention, according to the method for GB/T23349-2009 " arsenic, cadmium, lead, chromium, mercury ecological index in fertilizer ", process fertilizer sample with chloroazotic acid, the heavy metal content recording is all very low.The present invention has fundamentally solved the problem of town sewage plant sludge harmless, recycling.
Embodiment
With specific embodiment, technical scheme of the present invention is described below.
Analytical data in following embodiment, except indicating especially, all detects according to relevant national standard regulation.
Embodiment 1
100 parts of heavy metals immobilization agent (HMF-21, Environmental Protection Technology Co., Ltd provides by Yancheng City Baeyer logical sequence, lower same) are heated to 140～150 ℃ by spiral conveyer and send into mixing machine, fully mix with the 4000 parts of mud (mud moisture approximately 90%) in mixing machine; The mud mixing with heavy metals immobilization agent is sent in sunlight fermentation vat, (by Yancheng City Baeyer logical sequence, Environmental Protection Technology Co., Ltd provides to spray the useful microbial inoculum of aerobic microbiological, lower same), maintain the temperature at and at 50～65 ℃, carry out aerobic fermentation, use turnover throwing machine scarifying material every day once, aerobic fermentation 10 days, can make the abundant slaking of mud, dehydration, obtains 910 parts of (moisture: 45%) seedling wood flower Nutrition Soil.This Nutrition Soil, according to the method for GB/T23349-2009 " arsenic, cadmium, lead, chromium, mercury ecological index in fertilizer ", is processed fertilizer sample and detects with chloroazotic acid, and the massfraction of its heavy metal is far below standard limit index.Detected result is as follows:
| Test item | Unit | Index | Detected result | Examination criteria |
| Arsenic and compound thereof (in As) | % | ≤0.0050 | 0.0005 | GB/T23349-2009 |
| Cadmium and compound thereof (in Cd) | % | ≤0.0010 | 0 | GB/T23349-2009 |
| Lead and compound thereof (in Pb) | % | ≤0.0150 | 0.0009 | GB/T23349-2009 |
| Chromium and compound (in Cr) | % | ≤0.0500 | 0.0013 | GB/T23349-2009 |
| Mercury and mercuric compounds (in Hg) | % | ≤0.0005 | 0 | GB/T23349-2009 |
Embodiment 2
100 parts of heavy metals immobilization agent (HMF-55) are heated to 100～120 ℃ by spiral conveyer and send into mixing machine, fully mix with the 1400 parts of mud (mud moisture approximately 76%) in mixing machine; The mud mixing with heavy metals immobilization agent is sent in sunlight fermentation vat, spray the useful microbial inoculum of aerobic microbiological, maintain the temperature at and at 50～65 ℃, carry out aerobic fermentation, use turnover throwing machine scarifying material every day once, aerobic fermentation 12 days, can make the abundant slaking of mud, dehydration, obtain 610 parts of (moisture: 28.5%) biological organic fertilizer.Sample, is processed fertilizer sample and detects with chloroazotic acid according to the method for NY/T1978-2010 " mensuration of fertilizer mercury, arsenic, cadmium, lead, chromium content " by certain agriculture product quality supervision and inspection center, and the massfraction of its heavy metal is far below standard limit index.Result is as follows:
| Test item | Unit | Index | Detected result | Examination criteria |
| Total arsenic (As) (in butt) | mg/kg | ≤15 | 3 | NY/T1978-2010 |
| Total cadmium (Cd) (in butt) | mg/kg | ≤3 | 0 | NY/T1978-2010 |
| Total plumbous (Pb) (in butt) | mg/kg | ≤50 | 8 | NY/T1978-2010 |
| Total chromium (Cr) (in butt) | mg/kg | ≤150 | 13 | NY/T1978-2010 |
| Total mercury (Hg) (in butt) | mg/kg | ≤2 | 0 | NY/T1978-2010 |
Embodiment 3
100 parts of heavy metals immobilization agent (HMF-42) are heated to 120～130 ℃ by spiral conveyer and send into mixing machine, fully mix with the 1660 parts of mud (mud moisture approximately 85%) in mixing machine; The mud mixing with heavy metals immobilization agent is sent in sunlight fermentation vat, spray the useful microbial inoculum of aerobic microbiological, maintain the temperature at and at 50～65 ℃, carry out aerobic fermentation, use turnover throwing machine scarifying material every day once, aerobic fermentation 8 days, can make the abundant slaking of mud, dehydration, obtain 480 parts of (moisture: 27%) can utilize shale in soil, then make organic fertilizer through conventional granulation.Sample, is processed fertilizer sample and detects with chloroazotic acid according to the method for NY/T1978-2010 " mensuration of fertilizer mercury, arsenic, cadmium, lead, chromium content " through certain agriculture product quality supervision and inspection center, and the massfraction of its heavy metal is far below standard limit index.Result is as follows:
| Test item | Unit | Index | Detected result | Examination criteria |
| Total arsenic (As) (to dry base) | mg/kg | ≤15 | 3 | NY/T1978-2010 |
| Total cadmium (Cd) (to dry base) | mg/kg | ≤3 | 0 | NY/T1978-2010 |
| Total plumbous (Pb) (to dry base) | mg/kg | ≤50 | 9 | NY/T1978-2010 |
| Total chromium (Cr) (to dry base) | mg/kg | ≤150 | 16 | NY/T1978-2010 |
| Total mercury (Hg) (to dry base) | mg/kg | ≤2 | 0 | NY/T1978-2010 |
Embodiment 4
100 parts of heavy metals immobilization agent (HMF-63) are heated to 110～130 ℃ by spiral conveyer and send into mixing machine, fully mix with the 1000 parts of mud (mud moisture approximately 80%) in mixing machine; The mud mixing with heavy metals immobilization agent is sent in sunlight fermentation vat, spray the useful microbial inoculum of aerobic microbiological, maintain the temperature at and at 50～65 ℃, carry out aerobic fermentation, use turnover throwing machine scarifying material every day once, aerobic fermentation 12 days, can make the abundant slaking of mud, dehydration, obtain 430 parts of (moisture: 30%) be applicable to manufacturing the shale that organic-inorganic compound mixed fertilizer is used.
Use this shale, add chemical fertilizer and the Chemical Mixed Fertilizer amendments such as nitrogen, phosphorus, potassium, prilling process is made slowly-releasing organic-inorganic compound mixed fertilizer routinely.Sample gives certain agriculture product quality supervision and inspection center according to standard detection such as GB18877-2009 " organic-inorganic complex fertilizer ", GB/T23349-2009 " arsenic, cadmium, lead, chromium, mercury ecological index in fertilizer ", GB/T23348-2009 " slow release fertilizer ", completely conformance with standard; Process fertilizer sample and detect with chloroazotic acid, the massfraction of its heavy metal is far below standard limit index.Result is as follows:
Claims (2)
1. urban wastewater treatment firm sludge treatment is become soil to utilize a method for shale, it is characterized in that it comprises the following steps:
Step 1, is heated to 100～150 ℃ by the HMF type heavy metals immobilization agent measuring by spiral conveyer, sends into mixing machine, fully mixes with the mud dropping in mixing machine;
Step 2, to send in sunlight fermentation vat with metal-cured dose of mud mixing of thermogravimetric, spray aerobic beneficial microorganism microbial inoculum, maintain the temperature at and at 50～65 ℃, carry out aerobic fermentation, use turnover throwing machine scarifying material every day once, about aerobic fermentation 10 days, can make the abundant slaking of mud, dehydration, obtain qualified soil and utilize shale.
2. according to claim 1ly become soil to utilize the method for shale town sewage plant sludge treatment, it is characterized in that: in step 1, dewatered sludge with the massfraction of HMF type heavy metals immobilization agent than being 1:0.25～0.5.
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| CN201310722324.1A CN103771675A (en) | 2013-12-24 | 2013-12-24 | Method for treating sludge from urban sewage plant to obtain land utilization mud |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112979134A (en) * | 2021-04-29 | 2021-06-18 | 中铁水务集团有限公司 | Granular bioretention facility medium layer filler made of waterworks residual mud |
| CN114890641A (en) * | 2022-05-27 | 2022-08-12 | 广西鸿生源环保股份有限公司 | Harmless recycling treatment method for sludge and application of treated sludge |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1544366A (en) * | 2003-11-21 | 2004-11-10 | 同济大学 | Sludge heavy metal disposing method in land utilization |
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- 2013-12-24 CN CN201310722324.1A patent/CN103771675A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1544366A (en) * | 2003-11-21 | 2004-11-10 | 同济大学 | Sludge heavy metal disposing method in land utilization |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112979134A (en) * | 2021-04-29 | 2021-06-18 | 中铁水务集团有限公司 | Granular bioretention facility medium layer filler made of waterworks residual mud |
| CN112979134B (en) * | 2021-04-29 | 2021-10-22 | 中铁水务集团有限公司 | Granular bioretention facility medium layer filler made of waterworks residual mud |
| CN114890641A (en) * | 2022-05-27 | 2022-08-12 | 广西鸿生源环保股份有限公司 | Harmless recycling treatment method for sludge and application of treated sludge |
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Application publication date: 20140507 |