CN109133531A - A kind of process for town sewage treatment being applicable in quasi- IV class water quality standard - Google Patents
A kind of process for town sewage treatment being applicable in quasi- IV class water quality standard Download PDFInfo
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- CN109133531A CN109133531A CN201811178888.2A CN201811178888A CN109133531A CN 109133531 A CN109133531 A CN 109133531A CN 201811178888 A CN201811178888 A CN 201811178888A CN 109133531 A CN109133531 A CN 109133531A
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- 239000010865 sewage Substances 0.000 title claims abstract description 78
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000001914 filtration Methods 0.000 claims abstract description 33
- 239000004744 fabric Substances 0.000 claims abstract description 22
- 239000008188 pellet Substances 0.000 claims abstract description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 18
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 12
- 150000001875 compounds Chemical class 0.000 claims abstract description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 10
- 239000011574 phosphorus Substances 0.000 claims abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims abstract description 4
- 230000001954 sterilising effect Effects 0.000 claims abstract description 4
- 239000006228 supernatant Substances 0.000 claims abstract description 4
- 239000010802 sludge Substances 0.000 claims description 38
- 238000010992 reflux Methods 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 16
- 238000004062 sedimentation Methods 0.000 claims description 10
- 239000002957 persistent organic pollutant Substances 0.000 claims description 9
- 238000005189 flocculation Methods 0.000 claims description 7
- 230000016615 flocculation Effects 0.000 claims description 7
- 239000000356 contaminant Substances 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 5
- 238000011068 loading method Methods 0.000 claims description 5
- 238000006396 nitration reaction Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 230000013011 mating Effects 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000011001 backwashing Methods 0.000 claims description 3
- 238000005660 chlorination reaction Methods 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 238000010348 incorporation Methods 0.000 claims description 2
- 238000004065 wastewater treatment Methods 0.000 abstract description 8
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 238000005345 coagulation Methods 0.000 abstract description 2
- 230000015271 coagulation Effects 0.000 abstract description 2
- 239000003153 chemical reaction reagent Substances 0.000 abstract 1
- 239000000701 coagulant Substances 0.000 abstract 1
- 230000003750 conditioning effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 230000001376 precipitating effect Effects 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- 229920000388 Polyphosphate Polymers 0.000 description 2
- 229920000037 Polyproline Polymers 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000001205 polyphosphate Substances 0.000 description 2
- 235000011176 polyphosphates Nutrition 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002306 biochemical method Methods 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- 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
- C02F3/30—Aerobic and anaerobic processes
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The present invention provides a kind of process for town sewage treatment for being applicable in quasi- IV class water quality standard.The present invention relates to urban wastewater treatment fields, for a kind of sewage treatment process that quasi- IV class water up to standard requires, comprising the following steps: town sewage is by greater particle size rubbish, floating material, suspended matter and sandstone in coagulation (mainly by processing units such as thickness grid, setting pot, conditioning tanks) removal sewage etc.；It, which is discharged, enters the compound IFAS biochemical system of multistage AO, the pollutants such as removal most organic, total nitrogen, total phosphorus；IFAS water outlet enters A2The water outlet of the pond O enters secondary settling tank and is separated by solid-liquid separation；The supernatant of secondary settling tank discharge enters high speed pellets pond, and Dephosphorization reagent and coagulant reaction precipitating is added；The water outlet of high speed pellets pond enters high-precision filtering cloth filtering pool, and sewage is filtered removal SS；Water outlet reaches quasi- IV class water quality standard discharge after carrying out disinfection processing into sterilization pool.
Description
Technical field
The invention belongs to urban wastewater treatment fields, the newly-built sewage plant or existing particular for quasi- IV class water ring guaranteed request
Sewage plant proposes the whole process sewage technique of mark improvement project.
Background technique
In recent years, country's " urban wastewater treatment firm pollutant emission standard " of the newest announcement of Chinese Ministry of Environmental Protection (consults on
Original text), increase the index of correlation of special emission limit newly, main indicator refers to " water environment quality standard (3838-
2002) IV class water index in ".
" urban wastewater treatment firm pollutant emission standard " (GB18918) (exposure draft)
Basic item controlled highest allows concentration of emission (annual average) unit: mg/L
Beijing, Tianjin, Guangdong, Jiangsu, zhejiang and other places area have issued provincial standard in succession, have carried out the standard of proposing successively
The related work of IV class water.Existing sewage plant treatment process is directed to level-one A or level-one B progress process combination mostly and parameter is set
Meter, treatment effeciency is lower, and in order to reach quasi- IV class water requirement, the new process of urban wastewater treatment is attempted in various regions, and embrane method processing is adopted
With more, high treating effect is taken up little area, but invests that high, operating cost is high, and operational management is complicated, treatment effect, capital cost
With being difficult to optimize between, operating cost and balance.
Therefore, for national new standard and " five water are controlled altogether " target, emphasis solves persistent organic pollutants and removes degree
Not high, carbon source is insufficient the problems such as nitric efficiency is low, systematic collaboration is poor, urban wastewater treatment need exploiting economy efficiently and stablize
Total nitrogen, the total phosphorus advanced treating new process of operation.
Summary of the invention
Technical problems to be solved
The problem to be solved in the present invention is to provide a kind of process for town sewage treatment for being applicable in quasi- IV class water quality standard, to overcome
Organic pollutant removal degree is not high in the prior art, carbon source is insufficient, nitric efficiency is low, the defect of systematic collaboration difference etc., makes
Urban wastewater treatment more economical and efficient, stabilization.
Technical solution
To solve the technical problem, the present invention provides a kind of process for town sewage treatment for being applicable in quasi- IV class water quality standard,
Including level-one pretreatment system, secondary biochemical treatment system, three-level advanced treatment system composition, it is characterised in that including walking as follows
It is rapid:
(1) enter technique secondary biochemical treatment system by the pretreated town sewage of level-one, at the secondary biochemical
Reason system uses the compound IFAS technology of multistage AO, by the anaerobic zone A1, the anoxic zone A2, the aerobic zone O1, the aerobic zone O2, A3 anoxic
Area, the aerobic zone O3 are sequentially connected, and the anaerobic zone A1, the anoxic zone A2, the anoxic zone A2 are equipped with agitating device, and the A2 is lacked
Oxygen area, the anoxic zone A3, the aerobic zone O1 to the aerobic zone O3 add floating stuffing；The aerobic zone the O3 water outlet access secondary settling tank, two
The sludge outlet in the heavy pond A1 anaerobic zone described by sludge return pipe connection；Sewage initially enters the anaerobic zone A1, when stop
Between 1~2h, meanwhile, sedimentation in secondary sedimentation tank sludge enters the pond by sludge reflux pump, and blender operation promotes sewage and sludge mixed
It closing sufficiently, controls anaerobic state in pond, DO ≈ 0mg/L, sludge carries out release phosphorus in the anaerobic environment of the anaerobic zone A1, while into
Row aminating reaction.
(2) sewage enters the anoxic zone A2,0.5~3h of dwell time of sewage behind the anaerobic zone A1, and denitrification rates are designed as
0.03~0.06 (kgNO3- N/kgMLSSd), when flowing through the aerobic zone O2, the mixing liquid flowed through is nitrified, then passes through reflux
Pump enters the anoxic zone A2, reflux ratio >=200%, and agitating device operation promotes sewage and sludge mixing sufficiently, controls anoxic in pond
State, 0.2~0.5mg/L of DO ≈.The organic pollutant in sewage is removed, while carrying out denitrification denitrogenation reaction.It is first in the pond
It wants function denitrification denitrogenation to react, while removing dirty organic pollutants.
(3) sewage enters the aerobic zone O1, removal BOD and absorption phosphorus, BOD from the anoxic zone A25Sludge loading is designed as 0.4~
0.7(kgBOD5/ kgMLSSd), 2~4h of residence time.
(4) then sewage from the aerobic zone O1 enters the aerobic zone O2, this reaction tank primarily serves further removal BOD, complete
At nitration reaction function, nitrification liquid is back to the anoxic zone A2, total nitrogen load rate design≤0.05kgTN/ by reflux pump
KgMLSSd, 2~4h of residence time.
(5) then sewage from the aerobic zone O2 enters the anoxic zone A3, this reaction tank primarily serves carry out denitrification function, into
One step removes total nitrogen in sewage, and mixing is back to the anoxic zone A3, reflux ratio 50%~100%, when sewage stops by reflux pump
Between 1~2h, denitrification rates are designed as 0.03~0.06 (kgNO3- N/kgMLSSd), agitating device operation promotes sewage and dirt
Mud mixing sufficiently, controls anaerobic condition in pond, 0.2~0.5mg/L of DO ≈.
(6) then sewage from the anoxic zone A3 enters the aerobic zone O3, this reaction tank, which primarily serves, to carry out reoxygenation, further goes
Removal organic polluter and nitrification, residence time about 1h.
(7) then sewage from the aerobic zone O3 enters secondary settling tank, and the secondary settling tank carries out mud-water separation, and supernatant is as going out
Water is discharged into next treatment process, and a part of sludge is back to the anaerobic zone A1, and another part is discharged as excess sludge.It is more
The section pond AO and secondary settling tank form secondary biochemical treatment system, remove most organic pollutants, synchronous denitrification dephosphorizing.
(8) secondary clarifier effluent weir water outlet access high speed pellets pond, secondary clarifier effluent enter high speed pellets pond, high speed pellets pond
Mixing pit, flocculation basin, sedimentation basin are set, by the way that dephosphorization agent and flocculant is added, further remove total phosphor contaminant in sewage, drop
SS in low sewage.
(9) water outlet of high speed pellets pond enters high-precision filtering cloth filtering pool, further removes total phosphor contaminant in sewage, reduces dirty
SS in water.
(10) water outlet of high-precision filtering cloth filtering pool enters sterilization pool, after disinfection, qualified discharge.
The further preferred embodiment of the present invention are as follows: the compound IFAS process efficiency BOD of multistage AO5> 95%, TN >
80%, TP > 70% is discharged TN < 10mg/L.
The further preferred embodiment of the present invention are as follows: high speed pellets pond described in step (8) is disposed with mixed zone, wadding
Coagulation zone, settling zone control 2~3min of incorporation time, 5~8min of flocculation time, 15~40g/L of sediment, sludge reflux amount 3
~5%, inclined tube area 10~15m/h of upflow velocity are discharged SS < 10mg/L after processing.
The further preferred embodiment of the present invention are as follows: the filter-cloth filtering precision of high-precision filtering cloth filtering pool described in step (9)
It is 5 μm, mating improved backwashing system and control system guarantee that filtration treatment stable water outlet reaches SS≤5mg/L.
The further preferred embodiment of the present invention are as follows: disinfection uses chlorination, time of contact >=30min in step (10).
Its feature of the invention:
The compound IFAS technique of multistage AO of the invention increases biomass by increasing floating stuffing, steps up the place of system
Reason ability or performance, therefore higher processing capacity can be obtained under lesser occupied area；It solves polyP bacteria and nitrification is thin
The different sludge age battles of bacterium, nitrifier and polyP bacteria are cultivated respectively in different sludge systems, can be conducive to denitrification,
Dephosphorization and nitration reaction respectively carry out, and really realize synchronous denitrification dephosphorizing.Retain biomass to increase, sludge yield is reduced, simultaneously
The solid loading for not increasing sedimentation basin, can improve sedimentation function；Prepositive denitrification and rear-mounted denitrification comprehensively utilize, biomembrane
In can occur nitration denitrification simultaneously, improve technique entirety denitrification ability.Solves current routine secondary biochemical technique TN removal
Rate is lower, is not able to satisfy the problem of new standard requires.
High speed pellets pond of the invention, more traditional final deposition pool design, has and takes up little area, and removes total phosphorus object by dosing
Matter, effluent quality good feature can guarantee high-precision filter cloth before high speed pellets pond is set to high-precision filtering cloth filtering pool in technique
Filter tank treatment effect, and subsequent filter back washing frequency and water consumption are significantly reduced, extend filtering cloth filtering pool service life.
High-precision filtering cloth filtering pool of the invention uses high-precision filter cloth, and filter-cloth filtering precision is 5 μm, and design flexibility is strong,
SS intake in 20~30mg/L, is still able to satisfy the requirement of water outlet SS≤5mg/L, takes up little area, mating PLC control, degree of intelligence height.
Have the beneficial effect that technique of the invention is suitable for the grassroot project that town sewage proposes mark transformation and new standard requires,
By pretreatment, the compound IFAS technology of multistage AO, high speed pellets pond, the improvement of high-precision filtering cloth filtering pool and sequential combination, have
It is good to remove removal organic polluter, Nitrogen/Phosphorus Removal, it can ensure that stablizing for quasi- IV class water quality standard is realized.
Detailed description of the invention
Fig. 1 is a kind of flow chart of process for town sewage treatment for being applicable in quasi- IV class water quality standard.
Fig. 2 is embodiment sewage treatment process figure
Specific embodiment
With reference to embodiment, the embodiment of the present invention is furthur described in detail.Following embodiment is used for
Illustrate the present invention, but is not intended to limit the scope of the invention.
A kind of process for town sewage treatment being applicable in quasi- IV class water quality standard of the invention, including level-one pretreatment system, two
Grade biochemical treatment system, three-level advanced treatment system composition, it is characterised in that include the following steps:
(1) enter technique secondary biochemical treatment system by the pretreated town sewage of level-one, at the secondary biochemical
Reason system uses the compound IFAS technology of multistage AO, by the anaerobic zone A1, the anoxic zone A2, the aerobic zone O1, the aerobic zone O2, A3 anoxic
Area, the aerobic zone O3 are sequentially connected, and the anaerobic zone A1, the anoxic zone A2, the anoxic zone A2 are equipped with agitating device, and the A2 is lacked
Oxygen area, the anoxic zone A3, the aerobic zone O1 to the aerobic zone O3 add floating stuffing；The aerobic zone the O3 water outlet water accesses secondary settling tank,
The sludge outlet of the secondary settling tank A1 anaerobic zone described by sludge return pipe connection；Sewage initially enters the anaerobic zone A1, stops
1~2h of time, meanwhile, sedimentation in secondary sedimentation tank sludge enters the pond by sludge reflux pump, and blender operation promotes sewage and sludge
Mixing sufficiently, controls anaerobic state in pond, DO ≈ 0mg/L, and sludge carries out release phosphorus in the anaerobic environment of the anaerobic zone A1, simultaneously
Carry out aminating reaction.
(2) sewage enters the anoxic zone A2,0.5~3h of dwell time of sewage behind the anaerobic zone A1, and denitrification rates are designed as
0.03~0.06 (kgNO3- N/kgMLSSd), when flowing through the aerobic zone O2, the mixing liquid flowed through is nitrified, then passes through reflux
Pump enters the anoxic zone A2, reflux ratio >=200%, and agitating device operation promotes sewage and sludge mixing sufficiently, controls anaerobism in pond
State, 0.2~0.5mg/L of DO ≈.The organic pollutant in sewage is removed, while carrying out denitrification denitrogenation reaction.It is first in the pond
It wants function denitrification denitrogenation to react, while removing dirty organic pollutants.
(3) sewage enters the aerobic zone O1, removal BOD and absorption phosphorus, BOD from the anoxic zone A25Sludge loading is designed as 0.4~
0.7(kgBOD5/ kgMLSSd), 2~4h of residence time.
(4) then sewage from the aerobic zone O1 enters the aerobic zone O2, this reaction tank primarily serves further removal BOD, complete
At nitration reaction function, nitrification liquid is back to the anoxic zone A2, total nitrogen load rate design≤0.05kgTN/ by reflux pump
KgMLSSd, 2~4h of residence time.
(5) then sewage from the aerobic zone O2 enters the anoxic zone A3, this reaction tank primarily serves carry out denitrification function, into
One step removes total nitrogen in sewage, and mixing is back to the anoxic zone A3, reflux ratio 50%~100%, when sewage stops by reflux pump
Between 1~2h, denitrification rates are designed as 0.03~0.06 (kgNO3- N/kgMLSSd), agitating device operation promotes sewage and dirt
Mud mixing sufficiently, controls anaerobic condition in pond, 0.2~0.5mg/L of DO ≈.
(6) then sewage from the anoxic zone A3 enters the aerobic zone O3, this reaction tank, which primarily serves, to carry out reoxygenation, further goes
Removal organic polluter and nitrification, residence time about 1h.
(7) then sewage from the aerobic zone O3 enters secondary settling tank, and the secondary settling tank carries out mud-water separation, and supernatant is as going out
Water is discharged into next treatment process, and a part of sludge is back to the anaerobic zone A1, and another part is discharged as excess sludge.It is more
The section pond AO and secondary settling tank form secondary biochemical treatment system, remove most organic pollutants, synchronous denitrification dephosphorizing.
(8) secondary clarifier effluent weir water outlet access high speed pellets pond, secondary clarifier effluent enter high speed pellets pond, high speed pellets pond
Mixed zone, flocculation zone, settling zone are set, by the way that dephosphorization agent and flocculant is added, further remove total phosphor contaminant in sewage, drop
SS in low sewage.
(9) water outlet of high speed pellets pond enters high-precision filtering cloth filtering pool, further removes total phosphor contaminant in sewage, reduces dirty
SS in water.
(10) water outlet in fiber filter cloth filter tank enters sterilization pool, after disinfection, qualified discharge.Preferably, multistage AO is compound
IFAS process efficiency BOD5> 95%, TN > 80%, TP > 70% are discharged TN < 10mg/L.
Preferably, high speed pellets pond described in step (8) is disposed with mixed zone, flocculation zone, settling zone, and control is mixed
Close 2~3min of time, 5~8min of flocculation time, 15~40g/L of sediment, sludge reflux amount 3~5%, inclined tube area upper up-flow
10~15m/h of speed is discharged SS < 10mg/L after processing.
Preferably, the filter-cloth filtering precision of high-precision filtering cloth filtering pool described in step (9) is 5 μm, mating improved anti-
System and control system are washed, guarantees that filtration treatment stable water outlet reaches SS≤5mg/L.
Preferably, disinfection uses chlorination, time of contact >=30min in step (10).
The present embodiment is located at Zhejiang Province's urban wastewater treatment firm, and sewage treatment process is grid → setting pot → multistage AO
Compound IFAS biochemistry pool → secondary settling tank → high efficiency clarification tank → fiber filter cloth filter tank → disinfection, 200,000 m for the treatment of scale3/ d, disengaging
Water water quality parameter such as following table.
As seen from the above table, water inlet NH3- N, TN are higher, and influent load is higher, and the sludge loading in the compound pond IFAS multistage AO is
0.5kgBOD5/ kgMLSSd, the intensified anti-nitrated ability of supplementary carbon source, denitrification rates 0.05kgNO3- N/kgMLSSd leads to
Robot control system(RCS) is crossed, carbon source is quantitatively added according to water inlet TN value, dephosphorization agent and flocculant are added in high speed pellets pond, is discharged through high-precision
Spend filtering cloth filtering pool processing.Sewage disposal plant effluent water stabilization reaches quasi- IV class water discharge standard.
In conclusion it is restricted embodiment of the invention, all those skilled in the art that above embodiment, which is not,
The modification carried out on the basis of substantive content of the invention or equivalent deformation, in technology scope of the invention.
Claims (5)
1. a kind of process for town sewage treatment for being applicable in quasi- IV class water quality standard, including level-one pretreatment system, secondary biochemical treatment
System, three-level advanced treatment system composition, it is characterised in that include the following steps:
(1) enter technique secondary biochemical treatment system, the secondary biochemical treatment system by the pretreated town sewage of level-one
System use the compound IFAS technology of multistage AO, by the anaerobic zone A1, the anoxic zone A2, the aerobic zone O1, the aerobic zone O2, the anoxic zone A3,
The aerobic zone O3 is sequentially connected, and the anaerobic zone A1, the anoxic zone A2, the anoxic zone A2 are equipped with agitating device, the A2 anoxic
Area, the anoxic zone A3, the aerobic zone O1 to the aerobic zone O3 add floating stuffing；The aerobic zone the O3 water outlet access secondary settling tank, two is heavy
The sludge outlet in the pond A1 anaerobic zone described by sludge return pipe connection；Sewage initially enters the anaerobic zone A1, residence time 1
~2h, meanwhile, sedimentation in secondary sedimentation tank sludge enters the pond by sludge reflux pump, and blender operation promotes sewage and sludge mixing
Sufficiently, anaerobic state in pond, DO ≈ 0mg/L are controlled, sludge carries out release phosphorus in the anaerobic environment of the anaerobic zone A1, carries out simultaneously
Aminating reaction.
(2) sewage enters the anoxic zone A2,0.5~3h of dwell time of sewage behind the anaerobic zone A1, and denitrification rates are designed as 0.03
~0.06 (kgNO3- N/kgMLSSd), when flowing through the aerobic zone O2, nitrify the mixing liquid flowed through, then by reflux pump into
Enter the anoxic zone A2, reflux ratio >=200%, agitating device operation promotes sewage and sludge mixing sufficiently, controls anoxic shape in pond
State, 0.2~0.5mg/L of DO ≈.The organic pollutant in sewage is removed, while carrying out denitrification denitrogenation reaction.
(3) sewage enters O1 aerobic reaction tank, removal BOD and absorption phosphorus, BOD from the anoxic zone A25Sludge loading is designed as 0.4~
0.7(kgBOD5/ kgMLSSd), 2~4h of residence time.
(4) then sewage from the aerobic zone O1 enters the aerobic zone O2, to further removal BOD, completes nitration reaction function, nitrification liquid
The anoxic zone A2, total nitrogen load rate design≤0.05kgTN/kgMLSSd, 2~4h of residence time are back to by reflux pump.
(5) then sewage from the aerobic zone O2 pond enters the anoxic zone A3, carries out denitrification function, further removes total nitrogen in sewage,
Mixing is back to the anoxic zone A3, reflux ratio 50%~100%, 1~2h of dwell time of sewage, denitrification rates design by reflux pump
For 0.03~0.06 (kgNO3- N/kgMLSSd), agitating device operation promotes sewage and sludge mixing sufficiently, controls in pond
Anaerobic condition, 0.2~0.5mg/L of DO ≈.
(6) then sewage from the pond A3 enters O3 aerobic tank, carries out reoxygenation, further goes removal organic polluter and nitrification, stops
Stay time about 1h.
(7) then sewage from O3 aerobic tank enters secondary settling tank, and the secondary settling tank carries out mud-water separation, and supernatant is as water outlet row
It puts into next treatment process, a part of sludge is back to the anaerobic zone A1, and another part is discharged as excess sludge.
(8) secondary clarifier effluent weir water outlet access high speed pellets pond, secondary clarifier effluent enter high speed pellets pond, the setting of high speed pellets pond
Mixing pit, flocculation basin, sedimentation basin further remove total phosphor contaminant in sewage, reduce dirty by the way that dephosphorization agent and flocculant is added
SS in water.
(9) water outlet of high speed pellets pond enters high-precision filtering cloth filtering pool, further removes total phosphor contaminant in sewage, reduces in sewage
SS。
(10) water outlet in cloth filter tank enters sterilization pool, after disinfection, reaches quasi- IV class water quality standard discharge.
2. a kind of process for town sewage treatment for being applicable in quasi- IV class water quality standard according to claim 1, it is characterised in that: more
The compound IFAS process efficiency BOD of section AO5> 95%, TN > 80%, TP > 70% are discharged TN < 10mg/L.
3. a kind of process for town sewage treatment for being applicable in quasi- IV class water quality standard according to claim 1, it is characterised in that: step
Suddenly high speed pellets pond described in (8) is disposed with mixed zone, flocculation zone, settling zone, controls 2~3min of incorporation time, wadding
Solidifying 5~8min of time, 15~40g/L of sediment, sludge reflux amount 3~5%, inclined tube area 10~15m/h of upflow velocity, processing
It is discharged SS < 10mg/L afterwards.
4. a kind of process for town sewage treatment for being applicable in quasi- IV class water quality standard according to claim 1, it is characterised in that: step
Suddenly the filter-cloth filtering precision of high-precision filtering cloth filtering pool described in (9) is 5 μm, mating improved backwashing system and control system,
Guarantee that filtration treatment stable water outlet reaches SS≤5mg/L.
5. a kind of process for town sewage treatment for being applicable in quasi- IV class water quality standard according to claim 1, it is characterised in that: step
Suddenly disinfection uses chlorination, time of contact >=30min in (10).
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| CN112028394A (en) * | 2020-08-25 | 2020-12-04 | 长江勘测规划设计研究有限责任公司 | Low-consumption type high-standard treatment device for urban sewage and its treatment method |
| CN112028394B (en) * | 2020-08-25 | 2023-01-24 | 长江勘测规划设计研究有限责任公司 | Low-consumption and high-standard treatment device for urban sewage and its treatment method |
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| CN113264645A (en) * | 2021-06-09 | 2021-08-17 | 中铁环境科技工程有限公司 | Domestic sewage treatment system and treatment method |
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| CN116425363A (en) * | 2023-05-12 | 2023-07-14 | 沈阳环境科学研究院 | An emergency treatment method for urban sewage treatment plants |
| CN116282771A (en) * | 2023-05-16 | 2023-06-23 | 中国市政工程华北设计研究总院有限公司 | Village sewage treatment system and treatment process with suspended filler as core |
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