CN105347613A - Municipal sewage deep bed denitrification and dephosphorization treatment process - Google Patents

Municipal sewage deep bed denitrification and dephosphorization treatment process Download PDF

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Publication number
CN105347613A
CN105347613A CN201510742426.9A CN201510742426A CN105347613A CN 105347613 A CN105347613 A CN 105347613A CN 201510742426 A CN201510742426 A CN 201510742426A CN 105347613 A CN105347613 A CN 105347613A
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CN
China
Prior art keywords
denitrogenation dephosphorizing
sewage
filter
pond
bed
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Application number
CN201510742426.9A
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Chinese (zh)
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CN105347613B (en
Inventor
肖劲忠
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Guangzhou Qianfeng Environmental Treatment Engineering Co Ltd
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Guangzhou Qianfeng Environmental Treatment Engineering Co Ltd
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Priority to CN201510742426.9A priority Critical patent/CN105347613B/en
Publication of CN105347613A publication Critical patent/CN105347613A/en
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/2826—Anaerobic digestion processes using anaerobic filters

Abstract

The invention relates to the sewage treatment field, and particularly discloses a municipal sewage deep bed denitrification and dephosphorization treatment process. Specifically, the sewage from a sewage pool is subjected to treatment by a mixing tank and a denitrification and dephosphorization tank in order, and is discharged into a clean water tank; the clean water in the clean water tank and air are combined to perform back wash on a filter bed. The deep bed denitrification and dephosphorization pool provided by the invention can realize the technological method of multiple use of one pool, concentrated function and flexible operation. Through pneumatic and hydraulic united back wash operation at the filter pool bottom, the sewage treatment effect is further improved, and the filter bed service life is increased. The treatment process provided by the invention has the advantages of excellent municipal sewage treatment effect and simple operation.

Description

A kind of municipal wastewater dark bed denitrogenation dephosphorizing treatment process
Technical field
The present invention relates to sewage treatment area, be specifically related to a kind of municipal wastewater dark bed denitrogenation dephosphorizing treatment process.
Background technology
Sewage disposal technology can be divided into physical processing techniques, physical chemistry treatment technology, biochemistry treatment technology and chemical treatment method in general, wherein conventional with the biochemistry treatment technology of sewage, generally use biological denitrification phosphorous removal technique in the world at present.Biological treatment will reach denitrogenation dephosphorizing object just in the space of reactor or must create anaerobism, anoxic, the region such as aerobic the time, to realize multi-form anaerobic-aerobic dephosphorization, aerobic-anaerobic denitrogenation, required hydraulic detention time is longer, some technique reaches more than 12 hours, and capital cost and working cost are all higher.
Municipal wastewater is that a kind of change of water quality is large, deal with very difficult water source, total dissolved solidss, COD, BOD, total silicon, ammonia and the change of some other Pollutant levels are very frequent, add the organism containing high density in sewage before treatment, microorganisms etc., use single sewage water treatment method treatment effect often unsatisfactory.
Summary of the invention
In view of this, be necessary for above-mentioned problem, a kind of municipal wastewater dark bed denitrogenation dephosphorizing treatment process is provided.
Municipal wastewater of the present invention dark bed denitrogenation dephosphorizing treatment process comprises:
Step 1: the sewage in sewage lagoon enters mixing pit, and fills into carbon source in mixing pit;
Step 2: the carbonaceous sources sewage flowed out from mixing pit enters denitrogenation dephosphorizing pond, carries out machinery every filter, retain large particulate matter in sewage to sewage; Meanwhile, in denitrogenation dephosphorizing pond, add flocculation agent make sewage small particles material constantly carry out tiny flocculation, throw out is constantly retained by the filter bed in denitrogenation dephosphorizing pond, with the phosphorus in decontaminated water; And add in filter bed and be attached with microorganism, denitrification is carried out to the nitrate in sewage or nitrite and removes; The nitrogen that denitrification process produces constantly is driven away out from denitrogenation dephosphorizing pond.
Step 3: the waste water behind denitrogenation dephosphorizing pond, forms clear water and enters clean water basin;
Step 4: back flushing is carried out to described denitrogenation dephosphorizing pond, described back flushing comprises gas back-flushing and water body back flushing; Described gas back-flushing and water body back flushing are respectively and adopt gas blower to blast air bottom denitrogenation dephosphorizing pond, and are added bottom denitrogenation dephosphorizing pond via backwashing pump by the clear water in clean water basin, carry out back flushing to described filter bed; Water after back flushing flows out through top, denitrogenation dephosphorizing pond and enters wastewater disposal basin.
Further, the filter bed in described denitrogenation dephosphorizing pond comprises homogeneous filtering material layer, supporting layer; Described homogeneous filtering material layer is layed in above supporting layer; Denitrogenation dephosphorizing is equipped with filter block bottom pond, and described supporting layer is layed in above filter block; Described homogeneous filtering material layer is made up of silica sand; The proportion of described silica sand is greater than 2.6, and order number is 6 × 9, and diameter range is 2.0-3.0mm, and uniformity coefficient is less than 1.35, and sphericity is 0.8-0.9, and Mohs' hardness is 6-7; Described supporting layer is cobble, and supporting layer height is 0.45m; Described filter block is T-shaped filter block, and filter block height is 0.2m.
Further, described carbon source is the one in voltaile fatty acid, alcohols, carbohydrate, sanitary sewage; Preferred voltaile fatty acid.
Further, described microorganism is denitrifying bacteria.
Further, the temperature of reaction that removes of nitrogen described in step 2 is 20-35 DEG C, and the PH of reaction controls at 7-7.5.
Further, the DO removing reaction of nitrogen described in step 2 is 0.2-0.5mg/L.
Further, filter bed described in step 2 also added iron or manganese, to improve the speed of reaction that nitrogen removes reaction process.
Beneficial effect of the present invention is as follows:
Municipal wastewater of the present invention dark bed denitrogenation dephosphorizing treatment process process, comprises physical filtering, chemical tiny flocculation, biological denitrification; By the particulate matter in physical filtering effectively catching sewage; The total phosphorus in sewage effectively can be removed by chemical tiny flocculation; Remove the total nitrogen in sewage by denitrification, realize a pond multiplex, function is concentrated, the processing method gone slick.By the dynamic hydraulic combined backwash operation bottom filter tank, improve the effect of sewage disposal further, increase filter bed work-ing life.The present invention is good to municipal wastewater treatment effect, easy and simple to handle.
Accompanying drawing explanation
Fig. 1 is municipal wastewater of the present invention dark bed denitrogenation dephosphorizing processing technological flow schematic diagram.
Fig. 2 is municipal wastewater of the present invention dark bed denitrogenation dephosphorizing pool device schematic diagram.
Fig. 3 is that the process of dark bed pond contrasts with the water environment capacity of traditional tank process and shows graphic representation.
Fig. 4 is that the process of dark bed pond contrasts with the water head loss by filtration of traditional tank process and shows graphic representation.
Fig. 5 contrasts to show graphic representation in the backwash cycle of the process of dark bed pond and traditional tank process.
Description of symbols in accompanying drawing: sewage lagoon 1; Mixing pit 2; Denitrogenation dephosphorizing pond 3; Clean water basin 4; Gas blower 5; Backwashing pump 6; Head 11 in filter; Homogeneous filtering material 22; Supporting layer 33; Filter block 44; Receive water channel 55.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
Deep-bed filtration is compared with traditional filtering, and filter bed is darker, and particle diameter is larger.
Deep-bed filtration process is to reduce solid matter quantity discharged, and strengthen the rear water sterilization effect of filter, tiny flocculation removes total phosphorus, and denitrification removes total nitrogen.
The principle of deep-bed filtration comprises:
Every filter, namely machinery every filter and brought into incidental contact every filter.Machinery is used for particle diameter every filter and is greater than the particle in filtrate aperture by filtrate elimination; Filter material layer is made up of the filtering material particle varied in size, and has a lot of hole therebetween, wastewater streams through time, first the particle larger than hole be trapped within hole, indication hole more and more less, the less suspended particle later entered also is retained down, and waste water is purified.Brought into incidental contact comprises every filter the particle that particle diameter is less than filtrate aperture and is intercepted and captured due to brought into incidental contact; Particle can be deposited on filtrate accidentally isolates: or by collision, heavier particle is not with water sport; Or intercept and capture, be removed when the particle with water flow contacts with filter material surface; Or adhere to, when coagulated particles is by filtrate, they will be attached to filter material surface.
Absorption, contact cohesion, namely wastewater streams is in the process of filter material layer, will through sinuate current duct, the touch opportunity of suspended particle and filtrate is a lot, when contact, due to mutual intermolecular reactive force result, there is absorption and contact cohesion, when having added flocculation agent before especially filtering, contact cohesion is more outstanding, and it is better with the effect contacting cohesion to adsorb.
Denitrogenation dephosphorizing pond of the present invention treating processes adopts dark bed pond to carry out sewage water filtration, has significant difference compared with traditional filter tank, as shown in Table 1 and Table 2:
Table 1 denitrogenation dephosphorizing of the present invention pond and traditional filter tank surface contrast
Project Tradition filter tank Denitrogenation dephosphorizing pond
Filter tank structure H-type groove, V-type groove Rectangle
Distribute water and air Filter plate+filter Filter block
Maintenance repair Founding, scrape sand, filter maintenance Nothing
Filterins media run-off Have, need regular replenishment Nothing
Control overflow Accuracy requirement is high Accuracy requirement is low
Backwash mode Air water+surface sweep washing Air water
Construction period Long, need filter plate secondary to build and leveling filter head Short
Construction precision High Low
Table 2 denitrogenation dephosphorizing of the present invention pond and traditional filter tank internal feature contrast
Project Tradition filter tank Denitrogenation dephosphorizing pond
Filtrate material Fine sand Silica sand
Specification of filter material (diameter) mm 0.5-1 2-3
Filtrate uniformity coefficient K60<1.5，K80<2.0 K60<1.4，K80<1.45
Filter Machinery top layer is filtered into master Machinery, brought into incidental contact, adhesion, micro flocculating filter
Filtrate floor height mm 800-1200 1500-2200
Water environment capacity kg/m 2 1-2 4
Backwash cycle h 8-12 36-18
Water consumption % 5-8 2-4
Denitrification principle: under the environment of anoxic, by under the effect that is attached to the denitrifying bacteria on filtrate, utilizes carbon source as electron donor, by the process that nitrate or nitrate reductase become nitrogen to discharge, can be expressed as follows:
Nitrate+carbon source+microorganism → nitrogen
The state change process of denitrification N is as follows:
NO 3-N→NO 2-N→NO→N 2O→N 2↑
As shown in Figure 1, municipal wastewater of the present invention dark bed denitrogenation dephosphorizing treatment process comprises:
Step 1: the sewage in sewage lagoon 1 enters mixing pit 2 from intake vent 2-1, and by intake vent 2-2, one in voltaile fatty acid, alcohols, carbohydrate, sanitary sewage is filled into as carbon source to mixing pit 2; Preferred voltaile fatty acid.
Step 2: the carbonaceous sources sewage flowed out from mixing pit 2 enters denitrogenation dephosphorizing pond 3 through the gallery structure of narrow long type by intake vent 3-1, carries out machinery every filter, retain large particulate matter in sewage to sewage; Meanwhile, in sewage, add flocculation agent make sewage small particles material constantly carry out tiny flocculation, throw out is constantly retained by filter bed, except the phosphorus in decontaminated water; In filter bed, be attached with denitrifying bacteria denitrification denitrogenation process is carried out to the nitrate in sewage or nitrite; Described anti-nitration reaction temperature is 20-35 DEG C, and the PH of reaction controls at 7-7.5, DO to be that 0.2-0.5mg/L is conducive to anti-nitration reaction process; Anti-nitration reaction process can also add iron or manganese, to improve speed of reaction.The nitrogen that denitrification process produces constantly is driven away out from denitrogenation dephosphorizing pond, to reduce the vapour lock produced filtration procedure.
Step 3: the waste water behind denitrogenation dephosphorizing pond 3, forms clear water and enters clean water basin 4 by intake vent 4-1;
Step 4: carry out back flushing to described denitrogenation dephosphorizing pond 3, described back flushing comprises gas back-flushing and water backwashing; Described gas back-flushing and water body back flushing blast air for adopting gas blower 5 from denitrogenation dephosphorizing pond 3 bottom inlet passage 3-2, clear water in clean water basin 4 is added from denitrogenation dephosphorizing pond 3 bottom inlet passage 3-3 via backwashing pump 6 simultaneously, back flushing is carried out to described filter bed; Water after back flushing flows out through denitrogenation dephosphorizing pond 3 upper outlet passage 3-4 and enters wastewater disposal basin 1.
As shown in Figure 2, the filter bed in denitrogenation dephosphorizing pond of the present invention comprises homogeneous filtering material layer 22, supporting layer 33; Described homogeneous filtering material layer 22 is layed in above supporting layer 33; Be equipped with filter block 44 bottom denitrogenation dephosphorizing pond, described supporting layer 33 is layed in above filter block 44; Filter tank is installed and is provided with the upper head 11 of filter, filter tank outlet at bottom is also installed to be provided with and is received water channel 55; Described homogeneous filtering material layer 22 is made up of silica sand or compressible filtrate, and be highly 1.8-2.4m, the uniformity coefficient of filtrate is less than 1.35; As preferably, the silica sand of described homogeneous filtering material layer 22 is spherical, and the proportion of described silica sand is greater than 2.6, and order number is 6 × 9, and diameter range is 2.0-3.0mm, and sphericity is 0.8-0.9, and Mohs' hardness is 6-7; Described supporting layer 33 is cobble, and supporting layer 33 is highly 0.45m; Described filter block is T-shaped filter block, and described filter block is that HDPE material has good resistance to compression preservative activity, and filter block height is 0.2m.
As shown in Figure 3, the strainability test and comparison in dark bed process of the present invention and traditional filter tank is used: curve a is that traditional filter tank treat surface cuts dirt; Curve b is that the dark bed treat surface of the present invention cuts dirt.Visible traditional filter tank is cut pollution layer apart from filter material surface 30cm for main, and deep-bed filter is cut pollution layer apart from filter material surface 60-70cm for main.
As shown in Figure 4, use compared with dark bed process of the present invention processes with traditional filter tank, water head loss by filtration of the present invention is obviously little than traditional filter tank.
As shown in Figure 5, dark bed process of the present invention, under identical filtering velocity, has longer backwash cycle compared with processing with traditional filter tank.
From Fig. 3-5, compared with dark bed process of the present invention processes with traditional filter tank, there is better filtrate and receive dirty filtration capacity; Filter loss is less, and the backwash cycle of filtration unit is longer.
Below adopt voltaile fatty acid as carbon source, add a certain amount of denitrifying bacteria and iron, be 25 DEG C in temperature, under PH=7.0, DO be 0.3mg/L condition, use processing method of the present invention to carry out situation of disposing of sewage as follows:
The dark bed denitrogenation dephosphorizing of table 3 municipal wastewater
Project COD CR BOD 5 SS TN NH 4-N TP
Influent quality ≤50 ≤10 ≤40 ≤25 ≤5(8) ≤2
Effluent quality ≤50 ≤10 ≤10 ≤10 ≤5(8) ≤0.5
Above data show, sewage solid suspension substrate concentration SS, total nitrogen content TN after treatment, total phosphorous TP all can effectively remove.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (6)

1. a municipal wastewater dark bed denitrogenation dephosphorizing treatment process, is characterized in that, comprising:
Step 1: the sewage in sewage lagoon enters mixing pit, and fills into carbon source in mixing pit;
Step 2: the carbonaceous sources sewage flowed out from mixing pit enters denitrogenation dephosphorizing pond, carries out machinery every filter, retain large particulate matter in sewage to sewage; Meanwhile, in denitrogenation dephosphorizing pond, add flocculation agent make sewage small particles material constantly carry out tiny flocculation, throw out is constantly retained by the filter bed in denitrogenation dephosphorizing pond, with the phosphorus in decontaminated water; And add in filter bed and be attached with microorganism, denitrification is carried out to the nitrate in sewage or nitrite and removes; The nitrogen that denitrification process produces constantly is driven away out from denitrogenation dephosphorizing pond.
Step 3: the waste water behind denitrogenation dephosphorizing pond, forms clear water and enters clean water basin;
Step 4: back flushing is carried out to described denitrogenation dephosphorizing pond, described back flushing comprises gas back-flushing and water body back flushing; Described gas back-flushing and water body back flushing are respectively and adopt gas blower to blast air bottom denitrogenation dephosphorizing pond, and are added bottom denitrogenation dephosphorizing pond via backwashing pump by the clear water in clean water basin, carry out back flushing to described filter bed; Water after back flushing flows out through top, denitrogenation dephosphorizing pond and enters wastewater disposal basin.
2. municipal wastewater according to claim 1 dark bed denitrogenation dephosphorizing treatment process, is characterized in that, described carbon source is the one in voltaile fatty acid, alcohols, carbohydrate, sanitary sewage.
3. municipal wastewater according to claim 1 dark bed denitrogenation dephosphorizing treatment process, is characterized in that, described microorganism is denitrifying bacteria.
4. municipal wastewater according to claim 1 dark bed denitrogenation dephosphorizing treatment process, is characterized in that, the temperature of anti-nitration reaction described in step 2 is 20-35 DEG C, and the PH of reaction controls at 7-7.5.
5. municipal wastewater according to claim 1 dark bed denitrogenation dephosphorizing treatment process, is characterized in that, the DO of anti-nitration reaction described in step 2 is 0.2-0.5mg/L.
6. municipal wastewater according to claim 1 dark bed denitrogenation dephosphorizing treatment process, is characterized in that, the anti-nitration reaction process described in step 2 also added iron or manganese.
CN201510742426.9A 2015-11-02 2015-11-02 A kind of municipal wastewater depth bed denitrogenation dephosphorizing treatment process Expired - Fee Related CN105347613B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106082556A (en) * 2016-08-08 2016-11-09 华电水务工程有限公司 A kind of advanced nitrogen dephosphorization double layer filter system
CN106477719A (en) * 2016-10-26 2017-03-08 哈尔滨工业大学深圳研究生院 Integral synchronous dephosphorization denitrification deep-bed filter and processing system and its processing method
CN107686171A (en) * 2017-09-30 2018-02-13 神美科技有限公司 A kind of comprehensive sewage-treating agent for possessing dephosphorization and removing ammonia nitrogen complex function
CN108314183A (en) * 2018-03-13 2018-07-24 太平洋水处理工程有限公司 A kind of operation method of denitrification deep-bed filter system

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CN105000760A (en) * 2015-08-14 2015-10-28 得利满水处理系统(北京)有限公司 Technology of synchronous removal of nitrogen, phosphorus and suspended solids

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CN104609545A (en) * 2013-11-05 2015-05-13 中国科学院沈阳应用生态研究所 Method and apparatus for biochemical treatment of high concentration nitrate wastewater
CN105000760A (en) * 2015-08-14 2015-10-28 得利满水处理系统(北京)有限公司 Technology of synchronous removal of nitrogen, phosphorus and suspended solids

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106082556A (en) * 2016-08-08 2016-11-09 华电水务工程有限公司 A kind of advanced nitrogen dephosphorization double layer filter system
CN106477719A (en) * 2016-10-26 2017-03-08 哈尔滨工业大学深圳研究生院 Integral synchronous dephosphorization denitrification deep-bed filter and processing system and its processing method
CN106477719B (en) * 2016-10-26 2019-05-03 哈尔滨工业大学深圳研究生院 Integral synchronous dephosphorization denitrification deep-bed filter and processing system and its processing method
CN107686171A (en) * 2017-09-30 2018-02-13 神美科技有限公司 A kind of comprehensive sewage-treating agent for possessing dephosphorization and removing ammonia nitrogen complex function
CN107686171B (en) * 2017-09-30 2019-12-06 神美科技有限公司 Comprehensive sewage treatment agent with composite functions of removing phosphorus and ammonia nitrogen
CN108314183A (en) * 2018-03-13 2018-07-24 太平洋水处理工程有限公司 A kind of operation method of denitrification deep-bed filter system

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