AU2021102747A4 - A Municipal Wastewater Treatment Process Applicable to Quasi-Class IV Water Standard - Google Patents
A Municipal Wastewater Treatment Process Applicable to Quasi-Class IV Water Standard Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 26
- 239000010841 municipal wastewater Substances 0.000 title claims abstract description 24
- 238000004062 sedimentation Methods 0.000 claims abstract description 44
- 239000010802 sludge Substances 0.000 claims abstract description 36
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 20
- 239000011574 phosphorus Substances 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 238000010992 reflux Methods 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000002957 persistent organic pollutant Substances 0.000 claims abstract description 7
- 239000002351 wastewater Substances 0.000 claims description 44
- 238000001914 filtration Methods 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 238000005189 flocculation Methods 0.000 claims description 12
- 230000016615 flocculation Effects 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 7
- 238000004659 sterilization and disinfection Methods 0.000 claims description 7
- 239000006004 Quartz sand Substances 0.000 claims description 6
- 239000003344 environmental pollutant Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000005416 organic matter Substances 0.000 claims description 6
- 231100000719 pollutant Toxicity 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000000460 chlorine Substances 0.000 claims description 3
- 229910052801 chlorine Inorganic materials 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 244000005700 microbiome Species 0.000 claims description 3
- 229920000620 organic polymer Polymers 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 3
- VJYFKVYYMZPMAB-UHFFFAOYSA-N ethoprophos Chemical compound CCCSP(=O)(OCC)SCCC VJYFKVYYMZPMAB-UHFFFAOYSA-N 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 101000713585 Homo sapiens Tubulin beta-4A chain Proteins 0.000 description 1
- 102100036788 Tubulin beta-4A chain Human genes 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003851 biochemical process Effects 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000009287 sand filtration Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
Classifications
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
- C02F3/1215—Combinations of activated sludge treatment with precipitation, flocculation, coagulation and separation of phosphates
-
- 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
-
- 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
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/18—PO4-P
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Analytical Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention provides a municipal wastewater treatment process applicable to quasi
class IV water standard, including a primary pretreatment system, secondary biochemical
treatment system, tertiary deep treatment system; secondary biochemical system that adopts
PFEAS biochemical system (plug flow extended activated sludge method), which is connected
by anaerobic zone, anoxic zone and PFEAS zone in turn. The anaerobic zone and anoxic zone
are equipped with mixing devices, and the reflux pump for the mixture is set at the end of the
PFEAS zone to connect to the anoxic zone; the outlet water of the PFEAS zone is connected
to the secondary sedimentation tank, and the sludge outlet of the secondary sedimentation tank
is connected to the anaerobic tank through the sludge reflux pipeline; the outlet water of the
secondary sedimentation tank is connected to the high-speed sedimentation tank, and the outlet
water of the high-speed sedimentation tank is connected to the deep-bedded denitrification
filter. Finally,the outlet water is disinfected and discharged after reaching the standard of quasi
IV water; the wastewater treatment process described in the invention has good effect on
removing organic pollutants, denitrification and phosphorus removal, and can ensure the stable
realization of quasi-IV water discharge standard.
1/2
FIGURES
Municipal
Wastewtr
AnsaxobiecTank
An Tank
PFEAS Aeobic Tmk
3econdarySedinflation ,
Tank
Phophos High ed Sdadation Remained Removal .TakSldge
Chemicals ludge
Crbon DeepBeddedfDemitriication
Source Fle
Disimfedion Tank
Standardized
Discharge
Figure 1
Description
1/2 FIGURES
Municipal Wastewtr
AnsaxobiecTank
An Tank
PFEAS Aeobic Tmk
3econdarySedinflation , Tank
Phophos High ed Sdadation Remained Removal .TakSldge Chemicals ludge
Crbon DeepBeddedfDemitriication Source Fle
Disimfedion Tank
Standardized Discharge
Figure 1
A Municipal Wastewater Treatment Process Applicable to Quasi-Class IV Water
Standard
The invention relates to the technical field of wastewater treatment process, especially to the municipal wastewater treatment process applicable to quasi-class IV water standard
In recent years, the latest national "Discharge Standard of Pollutants for Municipal Wastewater Treatmentplant" (draft from public comment) announced by the Ministry of Environmental Protection. New indicators related to the special discharge limits, whose main indicators refer to the "Environmental Quality Standards for Surface Water (3838 2002)" in Class IV water indicators. See the following table for detail: "Discharge Standard of Pollutants for Municipal Wastewater Treatmentplant"(GB18918)(draft from public comment) Maximum allowable emission concentration of basic control items (daily average value) unit: mg/L Beijing, Tianjin, Guangdong, Jiangsu, Zhejiang and other regions have issued local standards, one after another to carry out the work related to the standard IV water. the municipal wastewater treatment process applicable to quasi-class IV water standard mainly includes a primary pretreatment system, secondary biochemical treatment system, tertiary deep treatment consisting of sewage treatment system; most of the existing wastewater plant treatment processes adopt the primarily A or B process combination and parameter design, and treatment efficiency is low, in order to achieve quasi-IV water requirements, many localities tried a variety of new processes for urban wastewater treatment; secondary treatment in the biofilm treatment is used more, its treatment effect is good, occupies a small area, but high investment, high operating costs, complex operation and management remain, and the treatment effect, investment costs, operating costs between the difficult to optimize and balance.
In summary, municipal wastewater treatment still need to develop economically efficient and stable operation of the new deep treatment process of total nitrogen and total phosphorus.
The technical problem to be solved: The problem to be solved by the present invention is to provide the municipal wastewater treatment process applicable to quasi-class IV water standard, in order to overcome the defects of the existing technology such as low degree of organic pollutant removal, low efficiency of denitrification with insufficient carbon source and poor system synergy, and make municipal wastewater treatment more economical, efficient and stable. Technical Solution: To solve the described technical problem, the present invention provides the municipal wastewater treatment process applicable to quasi-class IV water standard, comprising a primary pretreatment system, a secondary biochemical treatment system, and a tertiary depth treatment system, characterized by comprising the steps of: (1) The untreated wastewater undergoes primary pretreatment. (2) The primarily pretreated wastewater passes through a secondary biochemical system consisting of an anaerobic zone, anoxic zone, and PFEAS zone, the secondary biochemical using AAO process combined with plug flow extended activated sludge method method. (3) the anaerobic zone and anoxic zone are equipped with mixing device; the anaerobic zone through mixing makes the wastewater and the refluxed sludge discharged from the sedimentation tank reach a complete mixed state; the anaerobic zone releases phosphorus, while some of the organic matter is ammoniated, and some of the organic matter is adsorbed by the activated sludge and enters the next reaction. (4) The wastewater treated in the anaerobic zone enters the anoxic zone for denitrification and denitrification reaction, and the nitrate nitrogen is fed from the reflux mixture in the aerobic reaction tank with a reflux ratio of> 200% of the mixture.
(5) The PFEAS zone is provided with a partition wall so that the wastewater flows forward in the direction of the tank length, and the wastewater enters the PFEAS zone from the anoxic zone to remove COD, nitrification and sludge absorption of phosphorus and many other functions are completed in the PFEAS zone. (6) Mud-water separation is carried out in the secondary sedimentation tank to remove most of the organic pollutants, simultaneous denitrification and phosphorus removal, with part of the sludge flowing back into the anaerobic zone and the other part of the sludge discharged from the secondary sedimentation tank. (7) The outlet water of the secondary sedimentation tank enters the high-speed sedimentation tank, which is set up with mixing tank, flocculation tank and sedimentation tank to further remove the total phosphorus pollutants and reduce the SS in the wastewater by adding phosphorus remover and flocculation agent. (8) The wastewater from the high-speed sedimentation tank enters the deep-bedded denitrification filter, which adopts gravity filtration and adds carbon source as needed to achieve further denitrification through the bioflm on the surface of the filter media and to retain suspended matter in the wastewater. (9) The wastewater from the deep-bedded denitrification filter enters the disinfection filter, and the disinfected treated wastewater reaches the quasi-IV water standard for discharge. Further, the anaerobic zone HRT is controlled at 1 to 2h, DO is maintained at 0 to 0.2mg/L; anoxic zone HRT is control at 3h to 6h, denitrification rate is 0.03 to 0.06 (kgNO 3 -N/kgMLSS-d), DO is maintained at 0.2 to 0.5 mg/L; the PFEAS zone HRT is controlled 12~18h; sludge load is 0.03~0.08(kgBOD 5 /kgMLSS-d); total nitrogen load
rate is O0.05kgTN/kgMLSS-d; sludge reflux ratio is 50%~100; mixed liquor reflux
ratio is 300%400%, DO is maintained at 2~4mg/L.
Further,the PFEAS biochemical system treatment efficiency is: COD > 90%, TN= % to 85%, TP = 50% to 60%. Further,the high-speed sedimentation tank set mixing zone, flocculation zone, sedimentation zone. The mixing time is controlled within 2 ~ 3min; flocculation time is controlled within 5 ~ 8min; discharge mud concentration is 15 ~ 40g / L; sludge return flow rate is 3 ~ 5%; inclined pipe area rising flow rate id 10 ~ 15m / h; the treated wastewater SS is <0mg/L.
Further, the deep-bedded denitrification filter using uniformly graded coarse sand filtering media (d10 = 0.9 ~ 1.2mm, uneven coefficient K80 <1.4, sand layer height 1.8 ~ 2.5m), setting gas flushing, steam and water rinsing at the same time with rinsing by clear water. Controlling the filtration speed at 4-8m/h, denitrification load is <0.6(kgNO3 N/m3-d), the wastewater is SS <5mg/L, TP is <0.3mg/L by filter media retention and adsorption, with appropriate carbon source, the nitrate nitrogen is removed by denitrification of microorganisms, and the wastewater TN is <1Omg/L. Further, the disinfection process uses chlorine with contact time > 30min. Further, the filtering media layer in the deep bed denitrification filter adopts a quartz sand layer or a composite layer of quartz sand and organic polymer carrier. Further, the primary pre-treatment system, secondary biochemical treatment system, tertiary depth treatment system is connected to the PCL control system. Features of the present invention: The secondary biochemical treatment system in this invention adopts AAO process combined with plug flow extended activated sludge method, which can significantly improve the removal efficiency and purification degree of organic pollutants and TN than the conventional AAO process with lower sludge load and longer sludge age. The COD of the outlet can stably reach the quasi-IV water discharge standard; the process is simple and effective, easy to operate and manage, and solves the problem of low TN removal rate of the current conventional secondary biochemical process that cannot meet the requirements of the new standard. The high-speed sedimentation tank in this invention, compared with the traditional final sedimentation tank design, has the characteristics of occupying small spaces, removing the total phosphorus material by dosing to have good outlet water quality. The process sets the high-speed sedimentation tank in front of the denitrification filter, which can ensure the treatment effect of the denitrification filter and significantly reduce the backwashing frequency and water consumption of the subsequent denitrification filter. The deep-bedded denitrification filter is set after the high-speed sedimentation tank. The deep-bedded denitrification filter integrates denitrification biochemical reaction and filtration and retention functions into one set, and the denitrification reaction removes the residual nitrate nitrogen carried out by the PFEAS biochemical system, ensuring the removal of TN from the outlet under the condition of low carbon source, while the sand filtration function retains SS, allowing the outlet to meet the requirements of quasi-IV water standard. Functions are integrated; process is simplified, footprint is small, PLC control is supported, and intelligence is high. Beneficial effect: The process of the invention is suitable for municipal wastewater upgrading and new projects required by new standards. Through the improvement and orderly combination of primary pretreatment, PFEAS secondary biochemical treatment, high-speed sedimentation tank and deep-bedded denitrification filter, it has good effect of organic pollutant removal, nitrogen removal and phosphorus removal, and can ensure the stable realization of quasi-IV water discharge standard. BRIEF DESCRIPTION OF THE FIGURES Figure 1 shows a flow chart of an urban wastewater treatment process of the present invention that applies quasi-IV water standards. Figure 2 shows the flow chart of the treatment process after the standard improvement of the embodiment. DESCRIPTION OF THE INVENTION Specific embodiments of the present invention are described in further detail below in conjunction with embodiments. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the invention. The municipal wastewater treatment process applicable to quasi-class IV water standard includes a primary pretreatment system, secondary biochemical treatment system, tertiary deep treatment system; secondary biochemical system that adopts PFEAS biochemical system, which is connected by anaerobic zone, anoxic zone and PFEAS zone in turn. The anaerobic zone and anoxic zone are equipped with mixing devices, and the reflux pump for the mixture is set at the end of the PFEAS zone to connect to the anoxic zone; the outlet water of the PFEAS zone is connected to the secondary sedimentation tank, and the sludge outlet of the secondary sedimentation tank is connected to the anaerobic tank through the sludge reflux pipeline; the outlet water of the secondary sedimentation tank is connected to the high-speed sedimentation tank, and the outlet water of the high-speed sedimentation tank is connected to the deep-bedded denitrification filter. Finally,the outlet water is disinfected and discharged after reaching the standard of quasi-IV water Specifically, The municipal wastewater treatment process applicable to quasi-class IV water standard comprises a primary pretreatment system, a secondary biochemical treatment system, and a tertiary depth treatment system, characterized in that it includes the steps of: (1) The untreated wastewater undergoes primary pretreatment. (2) The primarily pretreated wastewater passes through a secondary biochemical system consisting of an anaerobic zone, anoxic zone, and PFEAS zone, the secondary biochemical using AAO process combined with plug flow extended activated sludge method method. (3) the anaerobic zone and anoxic zone are equipped with mixing device; the anaerobic zone through mixing makes the wastewater and the refluxed sludge discharged from the sedimentation tank reach a complete mixed state; the anaerobic zone releases phosphorus, while some of the organic matter is ammoniated, and some of the organic matter is adsorbed by the activated sludge and enters the next reaction. (4) The wastewater treated in the anaerobic zone enters the anoxic zone for denitrification and denitrification reaction, and the nitrate nitrogen is fed from the reflux mixture in the aerobic reaction tank with a reflux ratio of> 200% of the mixture. (5) PFEAS zone is provided with a partition wall so that the wastewater flows forward in the direction of the tank length, and the wastewater enters the PFEAS zone from the anoxic zone to remove COD, nitrification and sludge absorption of phosphorus and many other functions are completed in the PFEAS zone. (6) Mud-water separation is carried out in the secondary sedimentation tank to remove most of the organic pollutants, simultaneous denitrification and phosphorus removal, with part of the sludge flowing back into the anaerobic zone and the other part of the sludge discharged from the secondary sedimentation tank. (7) The outlet water of the secondary sedimentation tank enters the high-speed sedimentation tank, which is set up with mixing tank, flocculation tank and sedimentation tank to further remove the total phosphorus pollutants and reduce the SS in the wastewater by adding phosphorus remover and flocculation agent. (8) The wastewater from the high-speed sedimentation tank enters the deep-bedded denitrification filter, which adopts gravity filtration and adds carbon source as needed to achieve further denitrification through the biofilm on the surface of the filter media and to retain suspended matter in the wastewater.
9) The wastewater from the deep-bedded denitrification filter enters the disinfection filter, and the disinfected treated wastewater reaches the quasi-IV water standard for discharge. Preferably, the anaerobic zone HRT is controlled at 1 to 2h, DO is maintained at 0 to 0.2mg/L; anoxic zone HRT is control at 3h to 6h, denitrification rate is 0.03 to 0.06 (kgNO 3 -N/kgMLSS-d), DO is maintained at 0.2 to 0.5 mg/L; the PFEAS zone HRT is controlled 12~18h; sludge load is 0.03~0.08(kgBOD 5 /kgMLSS-d); total nitrogen load
rate is <0.05kgTN/kgMLSS-d; sludge reflux ratio is 50%~100%; mixed liquor reflux
ratio is 300%~400 % , DO is maintained at 2~4mg/L.
Preferably, the PFEAS biochemical system treatment efficiency is: COD > 90%, TN = 75% to 85%, TP = 50% to 60%.
Preferably, the high-speed sedimentation tank set mixing zone, flocculation zone, sedimentation zone. The mixing time is controlled within 2 ~ 3min; flocculation time is controlled within 5 ~ 8min; discharge mud concentration is 15 ~ 40g / L; sludge return flow rate is 3 ~ 5%; inclined pipe area rising flow rate id 10 ~ 15m / h; the treated wastewater SS is <10mg/L.
Preferably, the deep-bedded denitrification filter using uniformly graded coarse sand filtering media (d10 = 0.9 ~ 1.2mm, uneven coefficient K80 <1.4, sand layer height 1.8 ~ 2.5m), setting gas flushing, steam and water rinsing at the same time with rinsing by clear water. Controlling the filtration speed at 4-8m/h, denitrification load is <0.6(kgNO3-N/m3 d), the wastewater is SS <5mg/L, TP is <0.3mg/L by filter media retention and adsorption, with appropriate carbon source, the nitrate nitrogen is removed by denitrification of microorganisms, and the wastewater TN is <10mg/L. Preferably, the disinfection process uses chlorine with contact time > 30min.
Preferably, the filtering media layer in the deep bed denitrification filter adopts a quartz sand layer or a composite layer of quartz sand and organic polymer carrier. Preferably, the primary pretreatment system, secondary biochemical treatment system, tertiary depth treatment system is connected to the PCL control system. This embodiment is located in a municipal wastewater treatment plant in Zhejiang Province; the original plant wastewater treatment process is grating -- sand sedimentation tank -- improved SBR reaction tank -- disinfection. The treatment scale is ,000m 3 / d, in accordance with the implementation of "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant" (GB18918-2002) level B standard and the standard requirements of the quasi-IV water discharge standards. The inlet and outlet water quality parameters before and after the upgrading of municpal wastewater applicable to quasi-class IV water standard provided by the present invention are listed below:
Basic New Special Before Upgrading After Upgrading Control Emission (The Average Valure) (The Average Valure) Items Limits(ml/L Inlet Water Outlet Water Inlet Water Outlet Water ) Quality(ml/L Quality(ml/L Quality(ml/L Quality(ml/L ) ) )
) CODcr 30 283.75 24.82 286.8 13.4 BOD5 6 116.9 5.85 123.6 3.09 SS 5 158 10.33 182.72 2.92 TN "N" 10 46.8 20.09 40.63 5.97 Ammoni 1.5(3) 38.7 2.53 34.37 0.31 a Nitrogen "N" TP "P" 0.3 5.0 2.37 4.38 0.068
As can be seen from the above table, the original process operation inlets NH 3 -N, TN is high; the inlet load is high; the outlet NH 3 -N, TN, TP are unable to reach the design outlet quality stably. After using the process provided by the invention to improve the standard, the original modified SBR tank is changed to PFEAS biochemical system, with sludge load of 0.047kgBOD 5 /kgMLSS-d. The deep bed The denitrification filter is improved. The carbon source is supplemented to strengthen denitrification capacity, with a denitrification load of 0.575kgNO 3 - -N/m 3 -, and the carbon source is quantitatively added according to the inlet TN value through the automatic control system. The high speed sedimentation tank is added in number, with a surface load of 0.8m 3 /m 2 -h. The phosphorus remover and flocculant are added. The water quality of the treated outlet after the reformation has stably reached the quasi-IV water discharge standard. In summary, the above embodiment is not a limiting embodiment of the present invention, and any modification or equivalent deformation made by a person skilled in the art on the basis of the substance of the present invention is within the technical scope of the present invention.
Claims (8)
1. The municipal wastewater treatment process applicable to quasi-IV water standards comprises a primary pretreatment system, a secondary biochemical treatment system, and a tertiary depth treatment system, characterized by the following steps of: (1) The untreated wastewater undergoes primary pretreatment. (2) The primarily pretreated wastewater passes through a secondary biochemical system consisting of an anaerobic zone, anoxic zone, and PFEAS zone, the secondary biochemical using AAO process combined with plug flow extended activated sludge method method. (3) the anaerobic zone and anoxic zone are equipped with mixing device; the anaerobic zone through mixing makes the wastewater and the refluxed sludge discharged from the sedimentation tank reach a complete mixed state; the anaerobic zone releases phosphorus, while some of the organic matter is ammoniated, and some of the organic matter is adsorbed by the activated sludge and enters the next reaction. (4) The wastewater treated in the anaerobic zone enters the anoxic zone for denitrification and denitrification reaction, and the nitrate nitrogen is fed from the reflux mixture in the aerobic reaction tank with a reflux ratio of> 200% of the mixture. (5) The PFEAS zone is provided with a partition wall so that the wastewater flows forward in the direction of the tank length, and the wastewater enters the PFEAS zone from the anoxic zone to remove COD, nitrification and sludge absorption of phosphorus and many other functions are completed in the PFEAS zone. (6) Mud-water separation is carried out in the secondary sedimentation tank to remove most of the organic pollutants, simultaneous denitrification and phosphorus removal, with part of the sludge flowing back into the anaerobic zone and the other part of the sludge discharged from the secondary sedimentation tank. (7) The outlet water of the secondary sedimentation tank enters the high-speed sedimentation tank, which is set up with mixing tank, flocculation tank and sedimentation tank to further remove the total phosphorus pollutants and reduce the SS in the wastewater by adding phosphorus remover and flocculation agent. (8) The wastewater from the high-speed sedimentation tank enters the deep-bedded denitrification filter, which adopts gravity filtration and adds carbon source as needed to achieve further denitrification through the biofilm on the surface of the filter media and to retain suspended matter in the wastewater. 9) The wastewater from the deep-bedded denitrification filter enters the disinfection filter, and the disinfected treated wastewater reaches the quasi-IV water standard for discharge.
2. The municipal wastewater treatment process applicable to quasi-IV water standards according to claim 1 characterizes in that the anaerobic zone HRT is controlled at 1 to 2h, DO is maintained at 0 to 0.2mg/L; anoxic zone HRT is control at 3h to 6h, denitrification rate is 0.03 to 0.06 (kgNO 3 -N/kgMLSS-d), DO is maintained at 0.2 to 0.5 mg/L; the PFEAS zone HRT is controlled 12~18h; sludge load is 0.03~0.08(kgBOD 5 /kgMLSS d); total nitrogen load rate is <0.05kgTN/kgMLSS-d; sludge reflux ratio is 50%~100O; mixed liquor reflux ratio is 300%400%, DO is maintained at 2~4mg/L.
3. The municipal wastewater treatment process applicable to quasi-IV water standards according to claim 1 characterizes in that the PFEAS biochemical system treatment efficiency is: COD > 90%, TN = 75% to 85%, TP = 50% to 60%.
4. The municipal wastewater treatment process applicable to quasi-IV water standards according to claim 1 characterizes in that the high-speed sedimentation tank set mixing zone, flocculation zone, sedimentation zone. The mixing time is controlled within 2 ~ 3min; flocculation time is controlled within 5 ~ 8min; discharge mud concentration is 15 ~ g / L; sludge return flow rate is 3 ~ 5%; inclined pipe area rising flow rate id 10 15m/ h; the treated wastewater SS is <0mg/L.
5. The municipal wastewater treatment process applicable to quasi-IV water standards according to claim 1 characterizes in the deep-bedded denitrification filter using uniformly graded coarse sand filtering media (d10 = 0.9 ~ 1.2mm, uneven coefficient K80 <1.4, sand layer height 1.8 ~ 2.5m), setting gas flushing, steam and water rinsing at the same time with rinsing by clear water. Controlling the filtration speed at 4-8m/h, denitrification load is <0.6(kgNO3-N/m3-d), the wastewater is SS <5mg/L, TP is <0.3mg/L by filter media retention and adsorption, with appropriate carbon source, the nitrate nitrogen is removed by denitrification of microorganisms, and the wastewater TN is <1Omg/L.
6. The municipal wastewater treatment process applicable to quasi-IV water standards according to claim 1 characterizes in that the disinfection process uses chlorine with contact time > 30min.
7.The municipal wastewater treatment process applicable to quasi-IV water standards according to claim 1 characterizes in that the filtering media layer in the deep bed denitrification filter adopts a quartz sand layer or a composite layer of quartz sand and organic polymer carrier.
8. The municipal wastewater treatment process applicable to quasi-IV water standards according to claim 1 characterizes in that the primary pretreatment system, secondary biochemical treatment system, tertiary depth treatment system is connected to the PCL control system.
FIGURES 1/2
Figure 1
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113716666A (en) * | 2021-09-27 | 2021-11-30 | 福州创源同方水务有限公司 | Sewage advanced treatment system |
| CN115010258A (en) * | 2022-08-03 | 2022-09-06 | 北京汇馥低碳环保科技有限公司 | Integrated aeration sewage treatment tank for enriching microorganisms in intensive self-circulation manner and construction method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113716666A (en) * | 2021-09-27 | 2021-11-30 | 福州创源同方水务有限公司 | Sewage advanced treatment system |
| CN115010258A (en) * | 2022-08-03 | 2022-09-06 | 北京汇馥低碳环保科技有限公司 | Integrated aeration sewage treatment tank for enriching microorganisms in intensive self-circulation manner and construction method thereof |
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