CN101913703A - Primary sludge fermentation pretreatment method and system for improving performances of dephosphorization and denitrification on town sewage - Google Patents
Primary sludge fermentation pretreatment method and system for improving performances of dephosphorization and denitrification on town sewage Download PDFInfo
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Abstract
The invention relates to primary sludge fermentation pretreatment method and system for improving the performances of dephosphorization and denitrification on town sewage. In an integrated flocculation fermentation settling pond, a suspended sludge floc layer is formed and maintained with a certain interface height through auxiliary stirring and natural flocculent settling so as to realize the flocculent settling of suspended solids and colloids and tendentious separation of suspended solid inorganic components, and biotic populations in the suspended sludge floc layer have stronger effects of hydrolysis and fermentation on the suspended solids, the colloids and soluble organic matters. In the invention, the resolution ratio on the suspended solids and the colloids is 15-50 percent, the volatile fatty acid concentration is improved by 20-150 percent, the VSS/SS (Volatile Suspended Solid/Suspended Solid) ratio of effluent is improved by 20-60 percent, and the proportion of a high-quality carbon source is improved while the content of the suspended solid inorganic components is obviously reduced, which is beneficial to improving the capability of the subsequent processes on sludge activation as well as dephosphorization and denitrification. The invention has the advantages of convenient implementation, simple operation and management, flexible process adjustment and obvious effect.
Description
Technical field:
The present invention relates to a kind of pretreatment system and treatment process of town sewage, particularly a kind of first heavy fermentation pretreatment method and treatment system of improving town sewage dephosphorization denitrogenation performance.
Background technology:
The pollutant removal object of urban wastewater treatment firm and emission control index mainly comprise chemical oxygen demand (COD) (COD), biochemical oxygen demand (BOD
5), suspended solids (SS), ammonia nitrogen (NH
3-N), total nitrogen (TN) and total phosphorus (TP).No. 21 bulletin according to State Environmental Protection Administration's issue in 2006; the 4.1.2.2 bar of " urban wastewater treatment firm pollutant emission standard " (GB 18918-2002) is revised as " when the urban wastewater treatment firm water outlet enters sealing, semiclosed waters such as country and the major river valley of economize determining and lake, reservoir; carry out the A standard of primary standard; when entering GB3838 surface water III class function waters (except the Potable Water Conservation district and Swimming area of delimitation), GB3097 seawater two class function waters, carry out the B standard of primary standard ".
The first discharge standard of GB 18918-2002 has proposed quite high requirement to the emission control of nitrogen, phosphorus, and wherein primary standard A standard is: TP≤0.5mg/L, NH
3-N≤5mg/L, TN≤15mg/L, primary standard B standard is TP≤1.0mg/L, NH
3-N≤8mg/L, TN≤20mg/L.But the water inlet carbon-nitrogen ratio of China's overwhelming majority urban wastewater treatment firm is obviously on the low side, water inlet BOD
5/ TKN ratio only 3～4 is starkly lower than 5～6 of developed country, has a strong impact on the biological dephosphorize denitrification ability.Be provided with under the situation of conventional preliminary sedimentation tank, owing to the removal ratio difference to carbon, nitrogen, the problem that carbon-nitrogen ratio is on the low side can be more outstanding, BOD
5/ TKN ratio can be reduced to 2.5～3 level, and the unitary treatment efficiency of follow-up biological dephosphorization and denitrification process can be subjected to more significantly disadvantageous effect.
Mass production operation practice both domestic and external and laboratory study result show, the influent quality characteristic has very significantly influence to the dephosphorization and denitrification effect of urban wastewater treatment firm, the test determination result that country's urban water supply and drainage Engineering Technical Research Centre is finished in the Taihu Lake basin urban wastewater treatment firm shows, it is very limited only to carry out the TN removal amount that endogenous denitrification improved by the hydraulic detention time that increases the biological denitrification pond, and the organic denitrification denitrogenation speed of fast degraded biologically is 7～9 times of endogenous denitrification speed, when the outside adds the fast degraded biologically organism, the TN clearance can be significantly improved, and the carbon source of water inlet constitutes and carbon-nitrogen ratio is the key factor that influences biological denitrificaion and phosphor-removing effect.
Therefore, how at the actual water quality situation of China's town sewage and more and more higher dephosphorization denitrogenation processing requirements, new first heavy and sludge fermentation treatment system and treatment process are proposed, in the inorganic suspended solids component of effectively removing in the sewage, keep its organic constituent as far as possible, simultaneously the graininess organic constituent is converted into solvability organic constituent capable of being fast degraded, has crucial practical value.
Summary of the invention:
Purpose of the present invention just is to overcome above-mentioned the deficiencies in the prior art, and provide a kind of first heavy fermentation pretreatment system that improves town sewage dephosphorization denitrogenation performance, this system has biofloculation, precipitation and hydrolysed ferment function, can obviously improve the influent quality characteristic of urban wastewater treatment firm, improve the operating performance of its biological dephosphorize denitrification ability and integrated artistic flow process.
As above design, technical scheme of the present invention is: a kind of first heavy fermentation pretreatment method that improves town sewage dephosphorization denitrogenation performance, it is characterized in that: in urban wastewater treatment firm, flow into the bottom of just heavy fermentation vat earlier through the sewage after mechanical grille and the desilting processing, and realize the water distribution uniformity of sewage by the water inlet water distribution system, pass the first suspended sludge flco layer that sinks fermentation vat by the mode of upward flow then and carry out the biological fermentation pre-treatment, in suspended sludge flco layer, constantly carry out the liquefaction dissolving of particulate form solid organic matters, the hydrolysis of macromolecule organic, organic fermentation of monomer and acidifying, act on just heavy fermentation vat top by gravitational settling then and form solid-liquid displacement zone and carry out sinking separating of suspended solids and hydrolysed ferment product, the fermented supernatant fluid of formation is as the water outlet of this pretreatment system; The solid that the suspended solids liquefaction process is formed, inorganic content is higher sinks to the bottom of reaction tank, together with the excess sludge of suspended sludge flco layer, discharges subsequent disposal and the disposal of carrying out necessity by the reaction tank bottom.
Above-mentioned suspended sludge flco layer can advance or stir and obtain hybrid power by low speed, makes the suspended sludge flco keep the flco structure and the suspended sludge flco layer height of appropriateness.
A kind of first heavy fermentation pretreatment system that improves town sewage dephosphorization denitrogenation performance, it is characterized in that: by the first heavy fermentation vat (1), the water inlet water distribution system (2) that integrate just heavy and fermentation function, be installed on scraping of just heavy fermentation vat top and inhale mud crane span structure (3), be installed on the spoil disposal subsystem composition of scraping several thrusters (4) of inhaling on the mud crane span structure, be positioned at the water outlet weir plate (5) on just heavy fermentation vat top and go out water collecting groove (6), be positioned at bottom the just heavy fermentation vat; Wherein, central tube water distributor (2) is connected with the grid and the sand setting treat effluent mouth A of front end by pipeline, go out water collecting groove (6) and be connected with follow-up biological dephosphorization and denitrification process structures B by pipeline, the spoil disposal subsystem is connected with follow-up sludge treatment structures C by sludge pump and pipeline.
Can form in the above-mentioned just heavy fermentation vat and have the active suspended sludge flco of biological fermentation layer (9), the interfacial level of suspended sludge flco layer be less than or equal to just heavy effective pond, fermentation vat top dark 1/3.
The design surface rate of load condensate of above-mentioned just heavy fermentation vat is 3～5m
3/ (m
2H), the design hydraulic detention time is 30～60min, and the solid retention time of suspended sludge layer is 1～5d.
Above-mentioned water inlet water distribution system (2) is the center drum water distributor (2) of band nose cone or inclined to one side bottom opening, and it goes out the inclined to one side bottom position in bottom that head piece is positioned at just heavy fermentation vat, and the hole of center drum water distributor is a horizontal direction 45 opening.
Above-mentioned thruster (4) is low speed underwater scooter or submersible agitator.
The present invention has following advantage and positively effect:
(1) multiple functional, technical construction is simple, in a reaction tank, finish into separating of water suspended solids and the liquefaction decomposition of colloidal solid, the hydrolysis of complicated macromolecule organic, organic acidogenic fermentation and solid residue and tunning simultaneously, sewage quality is constituted take place to improve the dephosphorization denitrogenation ability of its subsequent technique than obvious variation.
(2) this pretreatment system can ferment by biological hydrolysis, biofloculation precipitates, physical sedimentation separates three kinds of modes and moves, change with the water quality and quantity that adapts to the different periods of sewage work, the technology operation is adjusted handiness and is obviously improved, and the construction costs of whole technological process and running cost reduce.
(3) suspended sludge flco layer height in the reaction tank and sludge concentration can be passed through the in addition control flexibly of adjustment of thruster stirring intensity (power and speed), to reach different acidication and solid separating effects, satisfy the improvement demand of follow-up biological dephosphorization and denitrification process to influent quality.
(4) sewage pretreating effect of the present invention is: water inlet suspended solids and colloidal liquefaction rate of decomposition reaches 15%～50%, the volatile fat acid concentration improves 20%～150%, the VSS/SS ratio of heavy fermentation water outlet just improves 20%～60%.
Description of drawings:
Fig. 1 is just heavy fermentation pretreatment system structure 1 synoptic diagram of the present invention.
Fig. 2 is just heavy fermentation pretreatment system structure 2 synoptic diagram of the present invention.
Embodiment:
A kind of first heavy fermentation pretreatment method that improves town sewage dephosphorization denitrogenation performance, in urban wastewater treatment firm, flow into the bottom (inclined to one side bottom) of just heavy fermentation vat earlier through the sewage after mechanical grille and the desilting processing, realize the water distribution uniformity of sewage and form the hydraulics of upward flow by the water inlet water distribution system, provide low intensive mixing condition by stirring at low speed (mixing) device for the suspended sludge flco layer that forms in the just heavy fermentation vat, make suspended sludge flco layer be in hybrid motion and suspended state more slowly, thereby finish the into biofloculation and the microorganism activation of water suspended solids and colloidalmaterial, but formation has the suspended sludge flco continuous supplementation suspended sludge layer of strong flocculation and sedimentation function, in the suspended sludge layer, constantly carry out the liquefaction (dissolving) of particulate form solid organic matters, the hydrolysis of macromolecule organic, organic fermentation of monomer and acidifying, acting on reaction tank top by gravitational settling then forms solid-liquid displacement zone and carries out sinking separating of suspended solids and hydrolysed ferment product, comprise the VFA that formed trickle suspended solids of suspended solids liquefaction process and acidification form in the fermented supernatant fluid that forms, discharge water as native system, enter follow-up biological treatment unit, the suspended solids liquefaction process is formed, the higher solid of inorganic content sinks to the bottom of reaction tank, excess sludge together with the suspended sludge layer, discharge by the reaction tank bottom, carry out necessary subsequent disposal and disposal then.
As depicted in figs. 1 and 2, in this specific embodiment, sewage primary sedimentation fermentation vat pretreatment system of the present invention by the first heavy fermentation vat (1), the water inlet water distribution system (2) that integrate just heavy and fermentation function, be installed on scraping of just heavy fermentation vat top and inhale mud crane span structure (3), be installed on the spoil disposal subsystem composition of scraping several low speed underwater scooters or the submersible agitator (4) inhaled on the mud crane span structure, be positioned at the water outlet weir plate (5) on just heavy fermentation vat top and go out water collecting groove (6), be positioned at bottom the just heavy fermentation vat; Wherein, central tube water distributor (2) is connected with the grid and the sand setting treat effluent mouth A of front end by pipeline, go out water collecting groove (6) and be connected with follow-up biological dephosphorization and denitrification process structures B by pipeline, the spoil disposal subsystem is connected with follow-up sludge treatment structures C by sludge pump and pipeline.The design surface rate of load condensate of above-mentioned just heavy fermentation vat is 3～5m
3/ (m
2H), the design hydraulic detention time is 30～60min, and the solid retention time of suspended sludge layer is 1～5d.Above-mentioned water inlet water distribution system (2) is the center drum water distributor (2) of band nose cone or inclined to one side bottom opening, and it goes out the inclined to one side bottom position in bottom that head piece is positioned at just heavy fermentation vat, and the hole of center drum water distributor is a horizontal direction 45 opening.Can form in the above-mentioned just heavy fermentation vat and have the active suspended sludge flco of biological fermentation layer (9), the interfacial level of suspended sludge flco layer be less than or equal to just heavy effective pond, fermentation vat top dark 1/3.
Because above-mentioned technical characterstic makes the treatment effect and the operational efficiency of sewage primary sedimentation fermentation pretreatment system of the present invention and method obviously be better than existing other types pretreatment system and method.According to the test determination of actual town sewage, sewage pretreating effect of the present invention is: water inlet suspended solids and colloidal liquefaction rate of decomposition reaches 15%～50%, the volatile fat acid concentration improves 20%～150%, the VSS/SS ratio of heavy fermentation water outlet just improves 20%～60%.
What need special proposition here is that above-mentioned description to specific embodiment is can understand and apply the invention for ease of those skilled in the art.The person skilled in the art obviously can be easily make various modifications and replenishes specific embodiment, and the General Principle of this explanation and method be applied among other embodiment and needn't pass through performing creative labour.Therefore, the invention is not restricted to above-mentioned specific embodiment, those skilled in the art should be within protection scope of the present invention for similar modification and the improvement of class Sihe that the present invention makes according to announcement of the present invention and method.
Claims (7)
1. first heavy fermentation pretreatment method that improves town sewage dephosphorization denitrogenation performance, it is characterized in that: in urban wastewater treatment firm, flow into the bottom of just heavy fermentation vat earlier through the sewage after mechanical grille and the desilting processing, and realize the water distribution uniformity of sewage by the water inlet water distribution system, pass the first suspended sludge flco layer that sinks fermentation vat by the mode of upward flow then and carry out the biological fermentation pre-treatment, in suspended sludge flco layer, constantly carry out the liquefaction dissolving of particulate form solid organic matters, the hydrolysis of macromolecule organic, organic fermentation of monomer and acidifying, act on just heavy fermentation vat top by gravitational settling then and form solid-liquid displacement zone and carry out sinking separating of suspended solids and hydrolysed ferment product, the fermented supernatant fluid of formation is as the water outlet of this pretreatment system; The solid that the suspended solids liquefaction process is formed, inorganic content is higher sinks to the bottom of reaction tank, together with the excess sludge of suspended sludge flco layer, discharges subsequent disposal and the disposal of carrying out necessity by the reaction tank bottom.
2. he requires the 1 described first heavy fermentation pretreatment method that improves town sewage dephosphorization denitrogenation performance according to right, it is characterized in that: above-mentioned suspended sludge flco layer can obtain hybrid power by auxiliary the stirring, makes the suspended sludge flco keep the flco structure and the suspended sludge flco layer height of appropriateness.
3. have the active suspended sludge flco of biological fermentation layer (9) according to forming in the above-mentioned just heavy fermentation vat of claim, the interfacial level of suspended sludge flco layer be less than or equal to just heavy effective pond, fermentation vat top dark 1/3.
4. first heavy fermentation pretreatment system that improves town sewage dephosphorization denitrogenation performance, it is characterized in that: by the first heavy fermentation vat (1), the water inlet water distribution system (2) that integrate just heavy and fermentation function, be installed on scraping of just heavy fermentation vat top and inhale mud crane span structure (3), be installed on the spoil disposal subsystem composition of scraping several thrusters (4) of inhaling on the mud crane span structure, be positioned at the water outlet weir plate (5) on just heavy fermentation vat top and go out water collecting groove (6), be positioned at bottom the just heavy fermentation vat; Wherein, central tube water distributor (2) is connected with the grid and the sand setting treat effluent mouth A of front end by pipeline, go out water collecting groove (6) and be connected with follow-up biological dephosphorization and denitrification process structures B by pipeline, the spoil disposal subsystem is connected with follow-up sludge treatment structures C by sludge pump and pipeline.
5. the first heavy fermentation pretreatment system that improves town sewage dephosphorization denitrogenation performance according to claim 4 is characterized in that: the design surface rate of load condensate of above-mentioned just heavy fermentation vat is 3～5m
3/ (m
2H), the design hydraulic detention time is 30～60min, and the solid retention time of suspended sludge layer is 1～5d.
6. the first heavy fermentation pretreatment system that improves town sewage dephosphorization denitrogenation performance according to claim 4, it is characterized in that: above-mentioned water inlet water distribution system (2) is the center drum water distributor (2) of band nose cone or inclined to one side bottom opening, it goes out the inclined to one side bottom position in bottom that head piece is positioned at just heavy fermentation vat, and the hole of center drum water distributor is a horizontal direction 45 opening.
7. the first heavy fermentation pretreatment system that improves town sewage dephosphorization denitrogenation performance according to claim 4 is characterized in that: above-mentioned thruster (4) is low speed underwater scooter or submersible agitator.
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| CN2010102184389A CN101913703B (en) | 2010-07-06 | 2010-07-06 | Primary sludge fermentation pretreatment system for improving performances of dephosphorization and denitrification on town sewage |
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Cited By (4)
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| CN104743743A (en) * | 2015-03-10 | 2015-07-01 | 浦华环保有限公司 | Upward flowing type deposition-hydrolyzing and two-stage AO biochemical treatment system and application thereof |
| CN104944577A (en) * | 2015-06-29 | 2015-09-30 | 浦华环保有限公司 | Sewage activity primary precipitation hydrolysis tank and application thereof |
| CN109354343A (en) * | 2018-12-18 | 2019-02-19 | 青岛沐邦环境科技有限公司 | Sewage treatment system and sewage treatment method by utilizing sludge fermentation of primary sedimentation tank |
| CN111450616A (en) * | 2020-04-07 | 2020-07-28 | 中国市政工程华北设计研究总院有限公司 | Efficient activated sludge interception type secondary sedimentation tank process system with coupling depth filtering function |
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| CN101139155A (en) * | 2007-08-20 | 2008-03-12 | 北京科技大学 | Non-excess activated sludge discharged printing and dyeing wastewater processing equipment and operation method thereof |
| CN201106003Y (en) * | 2007-09-24 | 2008-08-27 | 中山市环保实业发展有限公司 | Integral self-reflux multi-stage biochemical sewage water processing unit having sludge scraper |
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| CN2481705Y (en) * | 2001-06-11 | 2002-03-13 | 重庆市生华环保研究所 | Non-power domestic sewage intensified treating device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104743743A (en) * | 2015-03-10 | 2015-07-01 | 浦华环保有限公司 | Upward flowing type deposition-hydrolyzing and two-stage AO biochemical treatment system and application thereof |
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| CN109354343A (en) * | 2018-12-18 | 2019-02-19 | 青岛沐邦环境科技有限公司 | Sewage treatment system and sewage treatment method by utilizing sludge fermentation of primary sedimentation tank |
| CN109354343B (en) * | 2018-12-18 | 2021-07-06 | 青岛沐邦环境科技有限公司 | Sewage treatment system and sewage treatment method by utilizing sludge fermentation of primary sedimentation tank |
| CN111450616A (en) * | 2020-04-07 | 2020-07-28 | 中国市政工程华北设计研究总院有限公司 | Efficient activated sludge interception type secondary sedimentation tank process system with coupling depth filtering function |
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Effective date of registration: 20170623 Address after: 300074 Hexi District Meteorological Observatory Road, Tianjin, No. 99 Patentee after: China public works North China design studies Zong Yuan company limited Address before: 300074 Hexi District Meteorological Observatory Road, Tianjin, No. 99 Patentee before: National City Water Supply and Drainage Engineering Technology Research Center |