CN202610075U - Nutrient self-compensation and residual sludge reduction type sewage treatment system - Google Patents
Nutrient self-compensation and residual sludge reduction type sewage treatment system Download PDFInfo
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- CN202610075U CN202610075U CN 201220255160 CN201220255160U CN202610075U CN 202610075 U CN202610075 U CN 202610075U CN 201220255160 CN201220255160 CN 201220255160 CN 201220255160 U CN201220255160 U CN 201220255160U CN 202610075 U CN202610075 U CN 202610075U
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Abstract
The utility model discloses a nutrient self-compensation and residual sludge reduction type sewage treatment system. The system comprises a primary settling tank, a biological treatment tank, a secondary settling tank, a concentrated tank, a sludge digestion tank and a solid-liquid separation tank which are sequentially connected. A pH value regulating unit is arranged in the sludge digestion tank and is used for regulating a pH value in the sludge digestion tank, and the solid-liquid separation tank is arranged at the outlet of the sludge digestion tank and is used for enabling part of sludge to flow back to the sludge digestion tank. The solid-liquid separation tank is also connected with a sewage inlet channel, and a digested nutrient solution flows back to the sewage inlet channel. According to the system, the own nutrients in sludge is fully utilized, the treatment capacity of the system is enhanced, the good treatment effect of the system is ensured. Meanwhile, the emission of residual activated sludge of the system is greatly reduced, and the system has good economic and social benefits.
Description
Technical field
The utility model belongs to water-treatment technology field, relates to a kind of Sewage treatment systems, relates in particular to a kind of nutrition self-compensating and residual sludge reduction Sewage treatment systems.
Background technology
Along with urbanization and industrialized developing rapidly; Raising that cities and towns and industrial park environmental improvement require and Sewage treatment systems perfect; The wastewater treatment in China ability improves day by day, and the sewage plant sludge quantity that the need that bring are thus handled also increases rapidly (data show that the annual municipal sludge that produces of present China is up to more than 100,000,000 tons).Because the singularity of sludge quality, not only water ratio is high, perishable for it; Distribute the intensive foul smell; Also contain organic substance, nitrogen, phosphorus, heavy metal and salt and pathogenic micro-organism and parasitic ovum in the mud,, will influence environment as sewage treatment plant residual mud not being carried out effective treatment and disposal; Polluted-water and soil are detrimental to health.
Owing to draining system imperfection, receive that dirty rate is low excessively, the management of official website with safeguard reasons such as not in place, urbanite water consumption custom, have many sewage works especially the sewage work of combined system also be faced with into water COD
CrThe situation that concentration is on the low side.According to investigations, some sewage treatment plant inflow COD
CrConcentration is lower than 100mg/l, and is minimum even less than 60mg/l.Yet along with the problem of body eutrophication also becomes increasingly conspicuous, countries in the world are to but increasingly stringent of the nitrogen of sewage work, phosphorus emission standard.Cross the effect that low organic concentration must have influence on denitrogenation dephosphorizing, many sewage works are different according to the composition in its source, demonstrate the unbalance situation of nutritive proportion toward contact, are difficult to reach mikrobe ideal BOD: N: P=100: 5: 1 ratio.Thereby in actual motion, reach emission standard in order to ensure each item index, and the extra nutrition such as carbon, nitrogen, phosphorus that add of practical situation often need be looked by sewage work, and this has increased the operation cost of sewage work greatly.
Traditional sludge treatment mode such as landfill, throwing sea, burning etc.; Owing to receive self-technique to limit and possibly cause the risk of secondary pollution to environment; Be under an embargo gradually or be restricted, therefore recycling and the minimizing technology to sewage plant sludge also more becomes the focus that this area is paid close attention to.
Recycling sludge
Utilize mode to mainly contain to recycling sludge at present: compost is agricultural, material utilization and recovery energy etc.Compost is under certain condition through the fermentative action of mikrobe, organism constantly is degraded and stablizes, and produce a kind of process that is suitable for the product that the soil utilizes.Sludge composting mainly contains aerobic compost and anaerobic composting.Though sludge composting can stabilization mud and is processed fertilizer; But it is big that this method also is faced with floor space; Complicated, the made fertilizer of process management possibly perplex because of receiving problems such as heavy metal contamination, market acceptance is lower, especially industrial wastewater sludge is restricted especially.
The material utilization of mud mainly contains making brick from sludge, system cement, system light ceramic etc.Making brick from sludge is dewatered sludge or sludge burning ash residue to be mixed other material by a certain percentage as spike be fired into brick.Both can mud effectively be utilized with making brick from sludge, can reduce the consumption of clay and shale again.But equally also exist the energy consumption height, problems such as potential heavy metal contamination risk and produce market acceptance are arranged, so range of application is limited.
The recovery energy of mud has digestion producing methane, burning electricity generation etc.Burning is with utilizing incinerator to burn after the dewatered sludge mummification, and the heat energy that sludge incineration discharged is through the conversion of heat recovery system with power generation system realization energy, and roughly flow process is as shown in Figure 1 for it.
Though sludge incineration can subtract the appearance decrement largely, kill pathogenic agent and transform portion electric energy; But technology and equipment is complicated, the investment high, management difficulty is high; And because the combustion heat value of mud is low, water ratio is that 80% mud needs auxiliary fuel when burning electricity generation, causes therefore that energy consumption is big, expense is high, economy is not good; Be non-low-carbon (LC) treatment process, and the risk of topsoil is arranged.
Sludge reduction
The sludge reduction technology mainly contains supersonic method at present, adds the oxygenant method, warm aerobic method, anaerobic digestion in the metabolism uncoupling method, high temperature, add enzyme process, microfauna predation method etc.These methods all are the decrement methods of mud behind the technological process generation mud, are not that reform technology produces mud less in technological process.Make mud in the source decrement.Though above-mentioned these methods are from the different qualities of mud, the mud that has produced is had the effect that reduces sludge quantity, but also all have technical sophistication, drop into high, operation cost is high, some medicament even environmental safety problem etc. is arranged, so use all limited.
Comprehensive above-mentioned analysis, mud contains many heterogeneities, have by recycling maybe but as can reduce the output of mud from the source, avoid follow-up a series of investment for recycling or minimizing mud.
Particularly, see also Fig. 2, for general sewage work and combined system municipal wastewater treatment plant; Conventional excess sludge gets into and carries out processed after concentration basin concentrates; The concentration basin supernatant is back to system's feed-water end with the dehydration supernatant, and nutritive substances such as a large amount of carbon in the mud, nitrogen, phosphorus are got rid of with dehydration back excess sludge, not only cause system's desired nutritional material to run off; And the sludge quantity that residue need be handled is huge, drops into very big.
In view of this, nowadays press for and propose a kind of new sewage water treatment method, to dispose of sewage better.
The utility model content
The utility model technical problem to be solved is: a kind of nutrition self-compensating and residual sludge reduction Sewage treatment systems are provided, can increase the processing power of water treatment system, and guarantee that stable effluent quality is up to standard.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of nutrition self-compensating and residual sludge reduction Sewage treatment systems, said system comprise preliminary sedimentation tank, biological treatment tank, second pond, concentration basin, sludge digestion pond, solid-liquid separation tank;
Preliminary sedimentation tank is provided with the aquaporin of going into of sewage, and sewage is gone into aquaporin through this and got into preliminary sedimentation tank; Preliminary sedimentation tank, biological treatment tank, second pond connect successively;
Said second pond is provided with water exit, returned sluge passage, excess sludge passage, and second pond is with the mud and the water sepn of sewage; Isolated water flows out through water exit; Isolated a part of mud is back to biological treatment tank through the returned sluge passage, and excess sludge gets into concentration basin through the excess sludge passage and handles;
Said concentration basin connects the sludge digestion pond respectively, and preliminary sedimentation tank go into aquaporin;
Be provided with pH value regulon in the said sludge digestion pond,, make pH value in the sludge digestion pond remain on 7～8.5 scope in order to the pH value in the real-time regulated sludge digestion pond; PH value regulon comprises pH value detection module, regulator solution control module; Said pH value detection module is in order to the pH value in the real-time detection sludge digestion pond; Said regulator solution control module is in order to the detected result according to pH value detection module, the flow of regulating and controlling liquid;
The exit in said sludge digestion pond is provided with solid-liquid separation tank, carries out solid-liquid separation through solid-liquid separation tank; Solid-liquid separation tank is back to the sludge digestion pond with part mud, also will clear up the aquaporin of going into that nutritive medium is back to sewage.
A kind of nutrition self-compensating and residual sludge reduction Sewage treatment systems, said system comprise preliminary sedimentation tank, biological treatment tank, second pond, concentration basin, sludge digestion pond, the solid-liquid separation tank that connects successively;
Be provided with pH value regulon in the said sludge digestion pond, in order to regulate the pH value in the sludge digestion pond; The exit in said sludge digestion pond is provided with solid-liquid separation tank, in order to part mud is back to the sludge digestion pond; Solid-liquid separation tank also connects the aquaporin of going into of sewage, will clear up the aquaporin of going into that nutritive medium is back to sewage.
As a kind of preferred version of the utility model, said second pond is provided with water exit, returned sluge passage, excess sludge passage, and second pond is with the mud and the water sepn of sewage; Isolated water flows out through water exit; Isolated a part of mud is back to biological treatment tank through the returned sluge passage, and excess sludge gets into concentration basin through the excess sludge passage and handles.
As a kind of preferred version of the utility model, said concentration basin connects the sludge digestion pond respectively, and preliminary sedimentation tank go into aquaporin.
As a kind of preferred version of the utility model, said pH value regulon comprises pH value detection module, regulator solution control module; Said pH value detection module is in order to the pH value in the real-time detection sludge digestion pond; Said regulator solution control module is in order to the detected result according to pH value detection module, the flow of regulating and controlling liquid.
The beneficial effect of the utility model is: nutrition self-compensating and residual sludge reduction Sewage treatment systems that the utility model proposes; Technology is simply effective; Former technology is not being had under the situation of about-face too, making full use of the nutritive substance that excess sludge self contains system is replenished, increasing sludge concentration and system processing power greatly; And need not to add nutritive substance and medicament, effectively reduce working cost.
The utility model system has only the mud of minute quantity stabilization to discharge, and most of excess sludge is back in the biological treatment system through after clearing up, and has reduced the output of system's excess sludge.The utility model technology is according to the test measuring and calculating, and the final spoil disposal of system can reduce more than 60%, and this has greatly reduced the output of mud, has saved the expense of follow-up a series of sludge dewatering, outward transport, landfill.In addition, the dewatering of discharging the few stable excess sludge of system increases significantly, and finds that through the gravel water penetration test excess sludge character changes, and the settling property of testing active sludge in the also discovery system through SVI has remarkable lifting.
Because the improvement of this technology is to carry out to excess sludge, so the scale of construction is very little, therefore improved cost is very low, can not cause the increase of sewage work's operation cost in addition.On the contrary,, not only saved the expense that adds the nutrition medicament, also greatly reduced the cost of sludge disposal through the nutrient compensate in the excess sludge is arrived the processing system.
Therefore, the utility model technology is own nutritive substance in making full use of mud, and the enhanced system processing power when guaranteeing system's process well effect, has significantly reduced the excess activated sludge discharged amount of system, has good economical, societal benefits.
Description of drawings
Fig. 1 is the recovery energy schema of mud.
Fig. 2 is biologic process for treating sewage schema commonly used.
Fig. 3 is the schema of the utility model (SEP technology) sewage water treatment method.
Embodiment
Specify the preferred embodiment of the utility model below in conjunction with accompanying drawing.
Embodiment
The oneself that the utility model (can be described as the SEP novel process) can not only reach the nutritive substance of active sludge biological processing replenishes; And the surplus sludge volume of the generation of reduction system greatly; In the lifting system processing power, reduced the sludge treatment disposal costs.
The utility model SEP novel process is not carried out processed when handling concentrated back mud; But the sludge digestion pond is set; And, guarantee that nutritive substance efficiently discharges in the mud through regulating mixing parametric in the sludge digestion pond, making the pH value remain on 7～8.5 scope.Rear end, sludge digestion pond is provided with solid-liquid separation tank, can part mud be back to the sludge digestion pond to guarantee the sludge concentration in the sludge digestion pond on the one hand, discharges minute quantity stabilization mud simultaneously, has reduced the sludge disposal expense; Can be back to feed-water end entering system to replenish nutritive substances such as the required carbon of biochemical treatment, nitrogen, phosphorus with clearing up nutritive medium on the other hand.
The principle of the utility model technology (sewage work's nutrition self-compensating and residual sludge reduction new technology) is: under the prerequisite that does not increase a lot of investments; Through suitable improvement operational path; Make the residual active sludge of originally discharging system all through the effect in sludge thickener and sludge digestion pond, significantly improved the sludge concentration in sludge digestion pond, sludge digestion is provided with solid-liquid separation tank behind the pond; Through the modulation process parameter, reach nutrition self-liquidating in the technology.
See also Fig. 3, the utility model has disclosed a kind of nutrition self-compensating and residual sludge reduction Sewage treatment systems, and said system comprises preliminary sedimentation tank 1, biological treatment tank 2, second pond 3, concentration basin 4, sludge digestion pond 5, solid-liquid separation tank 6.
Preliminary sedimentation tank 1 is provided with the aquaporin of going into of sewage, and sewage is gone into aquaporin through this and got into preliminary sedimentation tank 1; Preliminary sedimentation tank 1, biological treatment tank 2, second pond 3 connect successively.
Said second pond 3 is provided with water exit, returned sluge passage, excess sludge passage, and second pond 3 is with the mud and the water sepn of sewage; Isolated water flows out through water exit; Isolated a part of mud is back to biological treatment tank 2 through the returned sluge passage, and excess sludge gets into concentration basin 4 through the excess sludge passage and handles.
Said concentration basin 4 connects sludge digestion pond 5 respectively, and preliminary sedimentation tank 1 go into aquaporin.Said concentration basin 4 carries out concentration with excess sludge, and the mud after concentrating inputs to sludge digestion pond 5.
Be provided with pH value regulon in the said sludge digestion pond 5,, make sludge digestion pond 5 interior pH values remain on 7～8.5 scope in order to regulate the pH value in the sludge digestion pond 5.PH value regulon comprises pH value detection module, regulator solution control module; Said pH value detection module is in order to the pH value in the real-time detection sludge digestion pond 5; Said regulator solution control module is in order to the detected result according to pH value detection module, the flow of regulating and controlling solution.
The exit in said sludge digestion pond 5 is provided with solid-liquid separation tank 6, carries out solid-liquid separation through solid-liquid separation tank 6; Solid-liquid separation tank 6 is back to sludge digestion pond 5 with part mud, also will clear up the aquaporin of going into that nutritive medium is back to sewage, then gets into preliminary sedimentation tank 1.
More than introduced nutrition self-compensating and residual sludge reduction Sewage treatment systems, the utility model also discloses a kind of nutrition self-compensating and residual sludge reduction sewage water treatment method when disclosing above-mentioned Sewage treatment systems; As shown in Figure 3, said method comprises the steps:
[step S1] sewage gets into preliminary sedimentation tank 1, but the hypostasis and the swimmer that remove in the decontaminated water through preliminary sedimentation tank 1.
The sewage that [step S2] handles through preliminary sedimentation tank 1 gets into biological treatment tank 2, utilizes activated sludge process that sewage is handled.Activated sludge process is to be the biologic process for treating sewage of main body with the active sludge.Activated sludge process is specially: in sewage, inject air and carry out aeration, keep throw out every day, change fresh sewage, so operate and after lasting for some time, generate a kind of filemot flocs unit, i.e. active sludge in the sewage.
The outlet of [step S3] biological treatment tank 2 connects second pond 3, makes mud and water sepn; Isolated water flows out through the outlet conduit of second pond 3; Isolated a part of mud is back to biological treatment tank 2, and excess sludge gets into concentration basin 4 and handles.
[step S4] excess sludge gets into concentration basin 4 and concentrates, and the concentration basin supernatant is back to the aquaporin of going into of sewage, inputs to preliminary sedimentation tank 1; Get into sludge digestion pond 5 through concentration basin 4 spissated excess sludges.
[step S5] regulates the pH value in the sludge digestion pond, makes the pH value remain on 7～8.5 scope, guarantees that nutritive substance efficiently discharges in the mud.Hydrolysis digestion pool domestic demand stirs, and stirring frequency is one day 2～4 times, each 1.5～3 hours; Hydraulic detention time is 10～20 hours.Particularly, through the pH value in the pH value regulon real-time regulated sludge digestion pond 5, make sludge digestion pond 5 interior pH values remain on 7～8.5 scope.PH value regulon comprises pH value detection module, regulator solution control module; Said pH value detection module is in order to the pH value in the real-time detection sludge digestion pond 5; Said regulator solution control module is in order to the detected result according to pH value detection module, the flow of regulating and controlling solution.
The exit in [step S6] sludge digestion pond 5 is provided with solid-liquid separation tank 6, carries out solid-liquid separation through solid-liquid separation tank 6, and part mud is back to sludge digestion pond 5 to guarantee the sludge concentration in the sludge digestion pond, discharges minute quantity stabilization mud simultaneously; In addition, will clear up the aquaporin of going into that nutritive medium is back to sewage, to replenish biochemical treatment desired nutritional material.
This technology can also effectively reduce processing cost when the system of assurance water outlet each item index reaches discharging standards.System has only the minute quantity excess sludge discharge of stabilization, has saved the investment and the consumption of sludge treatment and disposal.The dewatering of excess sludge is also significantly improved, and the water ratio of dehydrated sludge obviously descends.
Through lab scale, pilot scale research; Proof present technique utility model can make full use of mud idiotrophic element; Improve sink drainage self processing power; Significantly reduce excess sludge and discharge, and the mud of discharging is sufficient stabilization and good dehydration property is arranged, handle back water outlet each item index and reach discharging standards.The utility model is the new technology that can realize nutrition self-compensating and residual sludge reduction in the WWT fully.
Here description of the utility model and application is illustrative, is not to want the scope of the utility model is limited in the above-described embodiments.Here the distortion of the embodiment that is disclosed and change are possible, and the replacement of embodiment is known with the various parts of equivalence for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation of spirit that does not break away from the utility model or essential characteristic, and the utility model can be with other form, structure, layout, ratio, and realize with other assembly, material and parts.Under the situation that does not break away from the utility model scope and spirit, can carry out other distortion and change here to the embodiment that is disclosed.
Claims (5)
1. nutrition self-compensating and residual sludge reduction Sewage treatment systems is characterized in that said system comprises preliminary sedimentation tank, biological treatment tank, second pond, concentration basin, sludge digestion pond, solid-liquid separation tank;
Preliminary sedimentation tank is provided with the aquaporin of going into of sewage, and sewage is gone into aquaporin through this and got into preliminary sedimentation tank; Preliminary sedimentation tank, biological treatment tank, second pond connect successively;
Said second pond is provided with water exit, returned sluge passage, excess sludge passage, and second pond is with the mud and the water sepn of sewage, and isolated water flows out through water exit; Isolated a part of mud is back to biological treatment tank through the returned sluge passage, and excess sludge gets into concentration basin through the excess sludge passage and handles;
Said concentration basin connects the sludge digestion pond respectively, and preliminary sedimentation tank go into aquaporin;
Be provided with pH value regulon in the said sludge digestion pond, in order to the pH value in the real-time regulated sludge digestion pond; PH value regulon comprises pH value detection module, regulator solution control module; Said pH value detection module is in order to the pH value in the real-time detection sludge digestion pond; Said regulator solution control module is in order to the detected result according to pH value detection module, the flow of regulating and controlling solution;
The exit in said sludge digestion pond is provided with solid-liquid separation tank, carries out solid-liquid separation through solid-liquid separation tank; Solid-liquid separation tank is back to the sludge digestion pond with part mud, also will clear up the aquaporin of going into that nutritive medium is back to sewage.
2. nutrition self-compensating and residual sludge reduction Sewage treatment systems is characterized in that, said system comprises preliminary sedimentation tank, biological treatment tank, second pond, concentration basin, sludge digestion pond, the solid-liquid separation tank that connects successively;
Be provided with pH value regulon in the said sludge digestion pond, in order to regulate the pH value in the sludge digestion pond;
The exit in said sludge digestion pond is provided with solid-liquid separation tank, in order to part mud is back to the sludge digestion pond; Solid-liquid separation tank also connects the aquaporin of going into of sewage, will clear up the aquaporin of going into that nutritive medium is back to sewage.
3. nutrition self-compensating according to claim 2 and residual sludge reduction Sewage treatment systems is characterized in that:
Said second pond is provided with water exit, returned sluge passage, excess sludge passage, and second pond is with the mud and the water sepn of sewage, and isolated water flows out through water exit; Isolated a part of mud is back to biological treatment tank through the returned sluge passage, and excess sludge gets into concentration basin through the excess sludge passage and handles.
4. nutrition self-compensating according to claim 2 and residual sludge reduction Sewage treatment systems is characterized in that:
The outlet of said concentration basin connects the sludge digestion pond respectively, and preliminary sedimentation tank go into aquaporin.
5. nutrition self-compensating according to claim 2 and residual sludge reduction Sewage treatment systems is characterized in that:
Said pH value regulon comprises pH value detection module, regulator solution control module; Said pH value detection module is in order to the pH value in the real-time detection sludge digestion pond; Said regulator solution control module is in order to the detected result according to pH value detection module, the flow of regulating and controlling liquid.
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| CN 201220255160 CN202610075U (en) | 2012-05-31 | 2012-05-31 | Nutrient self-compensation and residual sludge reduction type sewage treatment system |
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| CN 201220255160 CN202610075U (en) | 2012-05-31 | 2012-05-31 | Nutrient self-compensation and residual sludge reduction type sewage treatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102659242A (en) * | 2012-05-31 | 2012-09-12 | 上海环保（集团）有限公司 | Nutrient self compensation and excess sludge reduction sewage treatment method and system thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102659242A (en) * | 2012-05-31 | 2012-09-12 | 上海环保（集团）有限公司 | Nutrient self compensation and excess sludge reduction sewage treatment method and system thereof |
| CN102659242B (en) * | 2012-05-31 | 2014-07-23 | 上海环保（集团）有限公司 | Nutrient self compensation and excess sludge reduction sewage treatment method and system thereof |
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