CN102583905B - Sewage treatment method - Google Patents
Sewage treatment method Download PDFInfo
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- CN102583905B CN102583905B CN201210074160.1A CN201210074160A CN102583905B CN 102583905 B CN102583905 B CN 102583905B CN 201210074160 A CN201210074160 A CN 201210074160A CN 102583905 B CN102583905 B CN 102583905B
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Abstract
The invention discloses a sewage treatment method and belongs to the field of sewage treatment. The method comprises the following steps of: pre-treatment, i.e. removing suspensions from the sewage; main treatment, i.e. conveying the pre-treated sewage into a main treatment system to be treated, wherein the main treatment system comprises an anaerobic zone, an anoxic zone, an aerobic zone and a settling region which are sequentially communicated, suspension fillers are respectively added into the anaerobic zone, the anoxic zone and the aerobic zone of the main treatment system, organics, ammonia nitrogen and phosphor are removed from the sewage through active sludge suspended in the anaerobic zone, the anoxic zone and the aerobic zone and a biological film attached to the suspension fillers, and sludge and water in a mixed solution discharged from the aerobic zone are separated through the settling region; and post treatment, i.e. after sterilizing the sewage subjected to the main treatment, directly discharging or reclaiming the sewage. The method is simple in technical step, low in cost and high in efficiency and can remove phosphor and nitrogen at the same time.
Description
Technical field
The present invention relates to sewage treatment area, relate in particular to a kind of efficient sewage water treatment method.
Background technology
From 20 beginnings of the century, the sewage biochemical processing taking activated sludge process as representative has been all to remove the sewage second-level biochemical treatment that carbonaceous organic material is core since setting up.Its water quality level of processing water only can reach BOD
520mg/L, SS20mg/L, and in raw waste water, ammonia nitrogen and phosphorus only have small portion synthetic for cell.In recent years, China clearly proposes sewage work and progressively will reach the requirement of GB18918-2002 " urban wastewater treatment firm pollutant emission standard " one-level A, and this standard and many users' reuse water standard approaches.Water quality slip-stick artist is in the time transforming and the former B-grade sewage of upgrading processes water or newly-built regeneration effluent water factory, also just get used to first carrying out sewage second-level processing, then carry out deep purifying, consider respectively its treatment process and flow process, then simple combination is got up, and reaches reuse water water quality or one-level A standard.At the beginning of design, from raw waste water to reuse water, do not purify and carry out whole process consideration.Therefore, in each unit structures, the removal kind of pollutent and load are all unavoidable there is unreasonable, uneconomical even wrong part, the problems such as this just makes, and existing town sewage processing exists that technical process is long, unit collocation is unreasonable, investment and working cost height.
The removal approach of phosphor in sewage is mainly to utilize chemical method or biological process, first the phosphorus in sewage is enriched in mud, then carries out mud-water separation, thereby realize the removal of the phosphorus in sewage.Because biological process dephosphorization has without adding chemical agent and mud nutriment in a fertilizer compared with advantages of higher, more meet the requirement of Sustainable development, there is good researching value and application prospect.The removal approach of nitrogen in municipal effluent, is mainly to utilize chemistry or biological method, first changes the nitrogen in sewage into gaseous substance as NH
3, N
2, then realize the removal of the nitrogen in sewage by gas-liquid separation, in addition, also have part nitrogen to discharge with excess sludge, and enter sludge treating system.With respect to chemical denitrogenation, biological denitrificaion has does not need to add the advantages such as chemical agent, has more wide development space in advanced treatment of wastewater process.
Biological phosphate-eliminating need to just can complete dephosphorization under anaerobism, the aerobic environment replacing at present, and biological denitrificaion need to carry out under anoxic, aerobic two kinds of conditions.Therefore, reach simultaneous nitrogen and phosphorus removal object, aerobic, anoxic, the three kinds of physiological environments of anaerobism that just must create that microorganism needs, so just formed the A of not only dephosphorization but also denitrogenation
2/ O (anaerobic-anoxic-oxic, anaerobic/anoxic/aerobic) technique.At present, this technique is applied in many sewage works all over the world, and still, long-time running result shows, when phosphor-removing effect is better, denitrification effect is often poor; And denitrification effect is when better, phosphor-removing effect is undesirable, generally cannot reach good removal effect simultaneously.
Summary of the invention
Embodiment of the present invention provides a kind of sewage water treatment method, can solve existing sewage treatment process and cannot take into account generally dephosphorization, denitrogenation problem simultaneously up to standard; Its economical and efficient and up to standard when can taking into account dephosphorization and denitrogenation.
As follows for addressing the above problem technical scheme provided by the invention:
Embodiment of the present invention provides a kind of sewage water treatment method, comprising:
Pre-treatment: by filtering and precipitating, remove the suspended substance in disposing of sewage;
Main processing: pretreated sewage is sent into and comprised that the host processing system of anaerobic zone, oxygen-starved area, aerobic zone and the settling region of connection is processed successively; Wherein, anaerobic zone, oxygen-starved area and the aerobic district of host processing system have added respectively floating stuffing, remove organism, ammonia nitrogen and the phosphorus in sewage by the active sludge suspending in anaerobic zone, oxygen-starved area and aerobic zone and the microbial film being attached on floating stuffing, the mixed solution of aerobic zone being discharged by settling region carries out mud-water separation;
Aftertreatment: will lead sewage after treatment sterile-processed after, directly discharge or reuse.
Can be found out by the above-mentioned technical scheme providing, the method that the invention process provides, cooperatively interact by pre-treatment, main processing and aftertreatment, and, in main treatment step, by the anaerobic zone, oxygen-starved area, aerobic zone and the settling region that are communicated with are successively set in host processing system used, by organism, ammonia nitrogen and phosphorus in anaerobic zone, oxygen-starved area and aerobic zone effective elimination sewage, the mixed solution that discharge aerobic zone settling region carries out mud-water separation, after aftertreatment sterilization, water outlet can directly be discharged or reuse again.The method processing step is simple, and cost is low and efficiency is high, can realize when taking into account dephosphorization and denitrogenation up to standard.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain other accompanying drawings according to these accompanying drawings.
The sewage water treatment method schematic diagram that Fig. 1 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with specific embodiment, the technical scheme in the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on embodiments of the invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to protection scope of the present invention.
Below the embodiment of the present invention is described in further detail.
Embodiment provided by the present invention provides a kind of sewage water treatment method, can be used for the upgrading of Small Town Wastewater processing and existing urban wastewater treatment firm, realize sewage is carried out to high-level efficiency advanced treatment cheaply, up to standard when making water outlet can take into account dephosphorization and denitrogenation, as shown in Figure 1, the method specifically comprises the following steps:
1) pre-treatment: by filtering and precipitating, remove the suspended substance in disposing of sewage;
Specifically can be communicated with and be formed pretreatment system by the structures such as grid and preliminary sedimentation tank, institute disposes of sewage and is introduced in the structures such as grid and preliminary sedimentation tank, removes the suspended substance such as hair, grit in sewage.
2) main processing: above-mentioned sewage after pretreatment is sent in host processing system, host processing system comprises the anaerobic zone, oxygen-starved area, aerobic zone and the settling region that are communicated with successively, wherein, in anaerobic zone, oxygen-starved area and aerobic zone, add respectively floating stuffing, by the active sludge that suspends in anaerobic zone, oxygen-starved area and aerobic zone be attached to the biomembranous synergy on floating stuffing, efficiently remove organism, ammonia nitrogen and phosphorus in sewage, the muddy water of mixed solution being discharged in aerobic zone by settling region separates;
In the host processing system of above-mentioned main treatment step, in anaerobic zone, oxygen-starved area and aerobic zone, add respectively the floating stuffing of different filling ratios, be specially:
The filling ratio of the floating stuffing adding in anaerobic zone accounts for 10%～20% of anaerobic zone useful volume;
The filling ratio of the floating stuffing adding in oxygen-starved area accounts for 20%～30% of oxygen-starved area useful volume;
The filling ratio of the floating stuffing adding in aerobic zone accounts for 30%～50% of aerobic zone useful volume.
Further, in the each reaction zone of above-mentioned host processing system, floating stuffing used is the floating stuffing that carries microorganism, and what floating stuffing, the oxygen-starved area that what anaerobic zone added is carries polyP bacteria added is, and what to carry that the floating stuffing of denitrifying bacteria and aerobic zone add is the floating stuffing that carries nitrifier.
Further, the floating stuffing that the anaerobic zone of above-mentioned host processing system, oxygen-starved area and aerobic district add respectively be shaped as cylindricality, spherical, its diameter or radius size are 10～20mm.
In the host processing system operational process of above-mentioned main treatment step, sewage in anaerobic zone, the hydraulic detention time (HRT) of oxygen-starved area and aerobic zone is respectively 0.5～1 hour, 0.5～2 hour and 3～5 hours; The return sludge ratio of settling region to anaerobic zone is 10%～60%; The return current ratio of the mixed liquid of aerobic zone to oxygen-starved area is 100%～200%.
Further, the anaerobic zone of the host processing system of above-mentioned main treatment step, oxygen-starved area, aerobic zone and settling region are arranged in one reaction pool, and reaction tank is square, circular, oval or their combination.Thereby form a kind of host processing system of integrated module.
Further, between anaerobic zone, oxygen-starved area, aerobic zone and the settling region of the host processing system of above-mentioned main treatment step, all there are dividing plate or partition wall, and dividing plate or partition wall are provided with floating stuffing blocking apparatus, the graticule mesh aperture ratio of blocking apparatus adds diameter or the little 2～5mm of radius of floating stuffing.Simultaneously, anaerobic zone and oxygen-starved area in the host processing system of above-mentioned main treatment step are provided with whipping appts, aerating apparatus is installed in aerobic zone, by whipping appts or aerating apparatus Shi Ge district (being anaerobic zone, oxygen-starved area and aerobic zone) interior active sludge and floating stuffing in fluidized state.
3) aftertreatment: will be through above-mentioned master sewage after treatment after disinfecting, directly discharge or reuse.
Below in conjunction with specific embodiment, aforesaid method is described further.
Embodiment
Handled sewage quality is: water temperature=12～25 DEG C, COD=200～500mg/L, BOD
5=100～250mg/L, SS≤200mg/L, NH
4 +-N=35～75mg/L, NO
2 --N < 0.25mg/L, NO
3 --N < 1.5mg/L, TP=3.5～8.0mg/L, pH=7.0～8.5.
The concrete steps of utilizing sewage water treatment method that the embodiment of the present invention provides to process above-mentioned water quality sewage are as follows:
(1) pre-treatment: by the structures such as grid and preliminary sedimentation tank, remove the suspended substance such as hair, grit in sewage;
(2) main processing: will send in host processing system through above-mentioned pretreated sewage, host processing system comprises the anaerobic zone, oxygen-starved area, aerobic zone and the settling region that are communicated with successively, by the synergy of suspended sludge and floating stuffing in anaerobic zone, oxygen-starved area and aerobic zone, remove organism, ammonia nitrogen and phosphorus in sewage, discharge mixed solution by aerobic zone, settling region and carry out mud-water separation;
(3) aftertreatment: sewage after treatment above-mentioned master, after disinfecting, is directly discharged or reuse.
Concrete technology parameter in above-mentioned treatment scheme with in aforesaid method, provide identical, no longer repeat at this.
Above-mentioned effluent quality after treatment is detected, and effluent quality is: water temperature=12～25 DEG C; COD < 50mg/L, clearance is more than 90%; BOD
5< 10mg/L, clearance is more than 95%; SS < 10mg/L, clearance is more than 95%; NH
4 +-N < 5mg/L, clearance is more than 95%; TN≤15mg/L, clearance is more than 90%; TP≤0.5mg/L, clearance is more than 90%; PH=7.0～8.5.
Known by the contrast of effluent quality after above-mentioned processing and sewage quality before treatment, the method for the embodiment of the present invention, compared with existing sewage treatment process, can be controlled the sludge age of obligate dephosphorization bacterial and obligate denitrifier in sewage disposal preferably, has greatly alleviated A
2in/O system, consider the intrinsic contradictions of dephosphorization and denitrogenation simultaneously.There is following beneficial effect: (1) the method good sewage processing effect, by the synergy of suspended sludge and floating stuffing, when realizing in sewage nitrogen and phosphorus, remove, meanwhile, sludge yield can reduce more than 30%; (2) the method is processed by system floor space little, initial cost and working cost are low, and take full advantage of floating stuffing and efficiently hold back the advantage of obligate microorganism, greatly shorten HRT and the return sludge ratio in sewage treatment process, therefore, system for use in carrying floor space, initial cost and working cost all can be saved more than 20%; (3) the method institute employing system can design integration modular structure, conveniently realizes automatization, and management maintenance is convenient.In sum, the disposal methods of the embodiment of the present invention is effective and economic performance is high, has all reached the leading level in the world.
The above; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (8)
1. a sewage water treatment method, for Small Town Wastewater processing, is characterized in that, is made up of following steps:
Pre-treatment: by filtering and precipitating, remove the suspended substance in disposing of sewage;
Main processing: pretreated sewage is sent into and comprised that the host processing system of anaerobic zone, oxygen-starved area, aerobic zone and the settling region of connection is processed successively; Wherein, anaerobic zone, oxygen-starved area and the aerobic district of host processing system adds respectively the floating stuffing of different filling ratios, remove organism, ammonia nitrogen and the phosphorus in sewage by the active sludge suspending in anaerobic zone, oxygen-starved area and aerobic zone and the microbial film being attached on floating stuffing, the mixed solution of aerobic zone being discharged by settling region carries out mud-water separation;
What floating stuffing, the oxygen-starved area that what the anaerobic zone of the host processing system of described main treatment step added is carries polyP bacteria added is, and what to carry that the floating stuffing of denitrifying bacteria and aerobic zone add is the floating stuffing that carries nitrifier;
Aftertreatment: will lead sewage after treatment sterile-processed after, directly discharge or reuse.
2. the method for claim 1, is characterized in that, in described pre-treatment step, remove the suspended substance in disposing of sewage be:
Grid and preliminary sedimentation tank are set before Main Processor Unit, remove hair, the grit suspended substance in sewage by grid filtration and preliminary sedimentation tank precipitation.
3. the method for claim 1, is characterized in that, in the host processing system of described main treatment step,
The filling ratio of the floating stuffing adding in anaerobic zone accounts for 10%～20% of anaerobic zone useful volume;
The filling ratio of the floating stuffing adding in oxygen-starved area accounts for 20%～30% of oxygen-starved area useful volume;
The filling ratio of the floating stuffing adding in aerobic zone accounts for 30%～50% of aerobic zone useful volume.
4. the method for claim 1, is characterized in that, in the host processing system operational process of described main treatment step, sewage in anaerobic zone, the hydraulic detention time of oxygen-starved area and aerobic zone is respectively 0.5～1 hour, 0.5～2 hour and 3～5 hours; The return sludge ratio of settling region to anaerobic zone is 10%～60%; The return current ratio of the mixed liquid of aerobic zone to oxygen-starved area is 100%～200%.
5. the method for claim 1, is characterized in that, anaerobic zone, oxygen-starved area, aerobic zone and the settling region of the host processing system of described main treatment step are all arranged in one reaction pool; Described reaction tank is square, circular, oval or their combination.
6. the method for claim 1, is characterized in that, the floating stuffing that anaerobic zone, oxygen-starved area and the aerobic district of the host processing system of described main treatment step adds respectively be shaped as cylindricality, spherical, its diameter or radius size are 10～20mm.
7. the method for claim 1, it is characterized in that, between anaerobic zone, oxygen-starved area, aerobic zone and the settling region of the host processing system of described main treatment step, all there are dividing plate or partition wall, and dividing plate or partition wall are provided with floating stuffing blocking apparatus, the graticule mesh aperture of blocking apparatus is less than the diameter or the radius 2～5mm that add floating stuffing.
8. the method for claim 1, it is characterized in that, the anaerobic zone of the host processing system of described main treatment step and oxygen-starved area are all provided with whipping appts, and aerating apparatus is installed in aerobic zone, by active sludge and floating stuffing in whipping appts or aerating apparatus Shi Ge district in fluidized state.
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