CN106630388B - Integral energy-saving method for sewage treatment of industrial park - Google Patents
Integral energy-saving method for sewage treatment of industrial park Download PDFInfo
- Publication number
- CN106630388B CN106630388B CN201611040373.7A CN201611040373A CN106630388B CN 106630388 B CN106630388 B CN 106630388B CN 201611040373 A CN201611040373 A CN 201611040373A CN 106630388 B CN106630388 B CN 106630388B
- Authority
- CN
- China
- Prior art keywords
- treatment
- sewage
- sludge
- sewage treatment
- energy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- 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
-
- 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
- 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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
-
- 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
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
-
- 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
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Treatment Of Sludge (AREA)
- Activated Sludge Processes (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses an integral energy-saving method for sewage treatment of an industrial park, which is mainly used for optimizing the integral route of sewage treatment of the industrial park, and comprehensively considers the relation between sewage pretreatment of enterprises and the sewage treatment process at the tail end of the park, namely, the aerobic biochemical process of sewage pretreatment of the enterprises is omitted, organic matters are left in the sewage treatment plant of the park for treatment, and the problem of insufficient carbon source at the denitrification and denitrification section of the sewage treatment plant at the tail end is solved; meanwhile, an energy extraction process link is arranged in a park sewage treatment system, namely an intensified primary treatment system, a high-load biochemical treatment system and a sludge anaerobic digestion system are arranged to recover energy; the energy consumption of sewage treatment is reduced, and the effect of extracting energy from sewage and treating sewage in a feedback way is achieved. The effect of the sewage treatment plant in the industrial park with the treated water amount of more than 10 ten thousand tons/day is particularly obvious.
Description
Technical Field
The invention relates to an integral energy-saving method for sewage treatment of an industrial park, belonging to the field of sewage treatment of the industrial park.
Background
The existing industrial park sewage treatment process is that after the sewage of an enterprise is treated by an internal sewage pretreatment facility of the enterprise, the sewage is discharged into a park sewage treatment plant for further treatment and then discharged into an external environment. The existing sewage treatment mainly comprises twoOne of the problems is that the whole sewage treatment process of the industrial park is a technology of 'using energy consumption', namely, the sewage pretreatment of enterprises and the sewage treatment plants of the park do not recover energy sources for organic matters in water, and the organic matters in the sewage are converted into CO through aerobic biochemistry2、H2The process for treating O by energy consumption consumes a large amount of energy. The second problem is the repeated construction of the aerobic biochemical treatment sections at the front and rear sections of the whole process of the industrial park, namely, organic carbon sources are excessively removed by aerobic biochemical treatment in the sewage pretreatment of the front-end enterprise, so that the carbon sources at the denitrification and denitrification sections of the tail-end sewage treatment plant are insufficient, carbon sources (such as methanol, sodium acetate and the like) need to be additionally added, and the overall treatment cost of the sewage of the industrial park is high. The invention discloses an integral energy-saving method for sewage treatment of an industrial park, which optimizes the integral route of sewage treatment of the industrial park, optimizes sewage pretreatment of enterprises and sewage treatment process at the tail end of the park by a general disc and solves the problem of insufficient carbon source of a denitrification and denitrification section of a tail-end sewage treatment plant; the process link of extracting energy from sewage is arranged, so that the energy consumption of sewage treatment is reduced, and the effect of reverse feeding sewage treatment by extracting energy from sewage is achieved.
Disclosure of Invention
The invention discloses an integral energy-saving method for sewage treatment of an industrial park, which is characterized by comprising the following steps:
(1) and (3) discharging the enterprise sewage after pretreatment: the sewage produced by enterprise production enters an internal sewage treatment facility of an enterprise for treatment, and is discharged into a sewage treatment plant of a park for unified treatment after treatment.
(2) Primary treatment: the method comprises the following steps that sewage firstly enters a grid, floating objects in the sewage are separated out, then the sewage enters a grit chamber, sand with large specific gravity in the sewage is removed from the sewage, the hydraulic retention time is 1-2 min, and then the sewage enters subsequent reinforced primary treatment;
(3) strengthening first-stage treatment: mechanically stirring and mixing the effluent and the return sludge in the step (2) for reaction for 10-20 min, then carrying out sludge-water separation by precipitation for 40-60 min, allowing the supernatant to enter a subsequent treatment process, and allowing the sludge to enter sludge anaerobic digestion for energy extraction; the return sludge refers to: sludge delivered from the secondary sedimentation tank.
(4) High-load biochemical treatment: carrying out high-load biochemical treatment on the supernatant obtained in the step (3), mixing and reacting the supernatant with return sludge in a secondary sedimentation tank and a primary sedimentation tank for 30min, wherein the sludge age is 0.3-0.5 d, and the dissolved oxygen is 0.2-0.7 mg/L, further transferring organic matters and the like in the sewage into the sludge, and then carrying out subsequent sedimentation and separation;
(5) primary precipitation: enabling the effluent in the step (4) to flow into the section for precipitation separation, wherein the precipitation time is 60-90 min, enabling the supernatant to enter a subsequent multi-stage AO process for treatment, enabling 50% of sludge to flow back to a high-load biochemical section, and discharging 50% of sludge into sludge for anaerobic digestion to extract energy;
(6) multistage AO biochemistry: and (5) performing multistage AO biochemical treatment on the supernatant, wherein the hydraulic retention time of the section is 8-10 hr, the sludge age is 15-20 d, organic substances and nitrogen and phosphorus phytonutrients in the sewage are basically removed to reach the discharge concentration of the effluent of a sewage treatment plant through biological treatment taking activated sludge as a main body in the section, and then the effluent enters a secondary sedimentation tank for separation.
(7) Secondary precipitation: enabling the effluent water in the step (6) to flow into the section for precipitation separation, wherein the precipitation time is 90-120 min, enabling supernatant fluid to enter subsequent advanced treatment, enabling 70-50% of sludge to flow back to multi-stage AO biochemical treatment, 20-30% of sludge to flow back to an enhanced first-stage treatment section, enabling 10-20% of sludge to flow back to high-load biochemical treatment, and discharging other surplus parts into sludge for anaerobic digestion and energy extraction;
(8) deep treatment: the effluent water in the step (7) enters an advanced treatment part to further degrade organic matters, phosphorus and suspended matters in the sewage, and is discharged to a natural water body after reaching the standard after being disinfected;
(9) anaerobic digestion of sludge: adopting A, B two sets of sludge anaerobic digestion systems to respectively treat the sludge generated by the reinforced primary treatment and other sludge; the two sludge treatment systems adopt medium-temperature digestion with T = 33-35 ℃, the digestion time is 20-30 d, the sludge solid concentration is 8% -12%, and after anaerobic digestion, energy recovery is carried out on methane; the supernatant returns to the front end of the sewage treatment system (namely primary treatment) for continuous treatment; and (3) the stable sludge discharged from the system A is dehydrated and then is identified to determine a disposal mode, and the stable sludge discharged from the system B is dehydrated and then is recycled.
The enterprise sewage is discharged after being pretreated, and the method comprises the following steps: the sewage pretreatment of enterprises is optimized, the aerobic biochemical process is not arranged, easily degradable organic pollutants are discharged to a tail-end sewage treatment plant for unified treatment, the sewage treatment cost of the enterprises and the investment of sewage treatment facilities are reduced, the problem of insufficient carbon source in the denitrification section of the sewage treatment plant in a park is solved, and good conditions are provided for extracting energy from subsequent sewage.
The invention is provided with the reinforced primary treatment section, and the organic matters in the sewage are adsorbed and flocculated by the sludge reflowing the secondary sedimentation without adding a flocculating agent in the reinforced primary treatment section, so that more energy sources are extracted, the operation load of the subsequent treatment process is reduced, and no chemical sludge is generated.
The invention sets two stages of organic matter adsorption flocculation transfer of reinforced first-stage treatment and high-load biochemical treatment to extract more energy sources; meanwhile, the operation load of the subsequent treatment process is reduced, and the energy consumption of the subsequent treatment is reduced.
The two sets of sludge anaerobic digestion devices can effectively minimize the dangerous waste sludge, fully play the scale and economic effect of a sewage treatment plant at the tail end of a park and realize the reverse feeding sewage treatment by extracting energy from the sewage. Wherein the method mainly aims at the sewage treatment of the industrial park with the water treatment amount of more than 10 ten thousand tons/day.
The invention further discloses an application of the integral energy-saving method for sewage treatment of the industrial park in solving the problem of repeated construction of aerobic biochemical process links for sewage treatment at the tail ends of enterprises and parks. The experimental results prove that: the invention can cancel the aerobic biochemical process in the sewage treatment of enterprises, reduce the sewage treatment cost of enterprises and the investment of sewage treatment facilities; meanwhile, the sewage discharged by enterprises is more beneficial to energy extraction of sewage treatment plants in parks and the operation of a multi-stage AO process.
The invention is described in more detail below:
an integral energy-saving method for sewage treatment of an industrial park is based on that the integral technical energy consumption of the sewage treatment of the industrial park is the lowest, mainly considers the relation between the sewage pretreatment of front-end enterprises and the treatment process of water quality and a tail-end sewage treatment plant, establishes an integral technical energy-saving method for the whole process of the sewage treatment of the industrial park, utilizes the capacity of the tail-end sewage treatment to reversely feed the sewage treatment, reduces the energy consumption and the sewage treatment cost of the industrial park, and establishes the integral technical energy-saving method for the sewage treatment of the industrial park. The method comprises the following steps:
(1) and (3) discharging the enterprise sewage after pretreatment: the sewage produced in enterprise production enters an enterprise internal sewage treatment facility for treatment, the key point is to remove toxic and harmful pollutants, reduce the removal of easily degradable organic pollutants as far as possible, and the enterprise sewage treatment facility is not provided with an aerobic biochemical section. After being pretreated, sewage of each enterprise in the park enters a park sewage treatment plant for unified treatment;
(2) primary treatment: the sewage firstly enters a grid to separate floating objects in the water, then enters a grit chamber to remove sand with large specific gravity from the sewage, the hydraulic retention time is 1-2 min, and then the sewage enters a subsequent process, namely enhanced first-stage treatment.
(3) Strengthening first-stage treatment: mechanically stirring and mixing the effluent and the return sludge in the step (2) for reaction for 10-20 min, then carrying out sludge-water separation by precipitation for 40-60 min, allowing the supernatant to enter a subsequent treatment process, and allowing the sludge to enter sludge anaerobic digestion for energy extraction; the return sludge refers to: sludge delivered from the secondary sedimentation tank.
(4) High-load biochemical treatment: carrying out high-load biochemical treatment on the supernatant obtained in the step (3), mixing and reacting the supernatant with return sludge in a secondary sedimentation tank and a primary sedimentation tank for 30min, wherein the sludge age is 0.3-0.5 d, and the dissolved oxygen is 0.2-0.7 mg/L, further transferring organic matters and the like in the sewage into the sludge, and then carrying out subsequent sedimentation and separation;
(5) primary precipitation: and (4) allowing the effluent in the step (4) to flow into the section for precipitation separation, allowing the precipitation time to be 60-90 min, allowing the supernatant to enter a subsequent multistage AO process for treatment, allowing 50% of sludge to flow back to a high-load biochemical section, and discharging 50% of sludge into sludge for anaerobic digestion to extract energy.
(6) Multistage AO biochemistry: and (3) performing multistage AO biochemical treatment on the supernatant obtained in the step (5), wherein the hydraulic retention time is 8-10 hr and the sludge age is 15-20 d, organic substances, nitrogen, phosphorus and other plant nutrient substances in the sewage are basically removed to reach the standard discharge concentration of the effluent of a sewage treatment plant through the composite action of activated sludge, and then the effluent enters a secondary sedimentation tank for separation. The activated sludge refers to a biological flocculating constituent of a biochemical pool, the sludge in the process section can be prepared by taking excess sludge of a municipal sewage treatment plant as inoculated sludge and carrying out culture and domestication, and belongs to the prior art, see Zhang Youjie main edition, and production of 4.10.1 sections of activated sludge treatment systems and culture and domestication of activated sludge in the 4 th edition of drainage engineering published by Chinese construction publishing company.
(7) Secondary precipitation: and (3) allowing the effluent in the step (6) to flow into the section for precipitation separation, wherein the precipitation time is 90-120 min, allowing supernatant to enter subsequent advanced treatment, allowing 50-70% of sludge to flow back to a multistage AO biochemical treatment stage, allowing 20-30% of sludge to flow back to an enhanced first-stage treatment stage, allowing 10-20% of sludge to flow back to a high-load biochemical treatment stage, and discharging other excess parts into sludge anaerobic digestion to extract energy.
(8) Deep treatment: and (4) enabling the effluent obtained in the step (7) to enter an advanced treatment part, further degrading organic matters, phosphorus and suspended matters in the sewage, and discharging the water to a natural water body after reaching the standard after disinfection.
(9) Anaerobic digestion of sludge: the anaerobic sludge digestion system is provided with two A, B systems respectively, and sludge generated by the reinforced primary treatment and other sludge are treated respectively. The reason is that if the industrial wastewater contains toxic and harmful pollutants, the sludge subjected to the enhanced primary treatment can be treated as hazardous waste after anaerobic digestion, so that on one hand, the minimization of hazardous waste can be ensured, and on the other hand, the resource utilization of the subsequent sludge is not influenced. The two sludge treatment systems adopt medium-temperature digestion with T = 33-35 ℃, the digestion time is 20-30 d, the sludge solid concentration is 8% -12%, and after anaerobic digestion, energy recovery is carried out on methane; the supernatant returns to the front end of the sewage treatment system (namely primary treatment) for continuous treatment; and (3) the stable sludge discharged from the system A is dehydrated and then is identified to determine a disposal mode, and the stable sludge discharged from the system B is dehydrated and then is recycled. The anaerobic sludge digestion system belongs to the prior art, and refers to anaerobic sludge digestion in section 8.3 in the 4 th edition of drainage engineering published by Zhang Zijie.
Compared with the prior art, the integral energy-saving method for treating the sewage in the industrial park has the positive effects that:
(1) the invention optimizes the sewage pretreatment (without aerobic biochemical process) and the water quality of the discharged water of enterprises, discharges easily degradable organic pollutants to a tail-end sewage treatment plant for unified treatment, and reduces the sewage treatment cost of enterprises and the investment of sewage treatment facilities. The technical link of the sewage treatment in the optimized park is provided with the reinforced primary treatment section, a flocculating agent is not additionally added in the reinforced primary treatment section, and organic matters in the sewage are adsorbed and flocculated by the sludge of the backflow secondary sedimentation, so that more energy sources are extracted, the operation load of the subsequent treatment process is reduced, and no chemical sludge is generated.
(2) The invention optimizes the technical link of the sewage treatment in the park, sets the adsorption flocculation transfer of two-stage organic matters of strengthening first-stage treatment and high-load biochemical treatment, improves the content of organic matters in the sludge, and can produce more biogas; and the organic pollutant load of a treatment facility is reduced, and the energy consumption of subsequent sewage treatment is favorably reduced.
(3) The invention is provided with two sets of sludge anaerobic digestion devices, can effectively minimize dangerous waste sludge, fully exerts the scale and economic effect of a sewage treatment plant at the tail end of a park, and extracts energy from sewage to feed back the sewage for treatment.
(4) The invention is based on the lowest overall technical energy consumption of industrial park sewage treatment, mainly considers the relation between the sewage pretreatment of front-end enterprises and the treatment process of water quality and park sewage treatment plants, the retention of carbon source can solve the problem of carbon source of denitrification process in park sewage treatment, and meanwhile, the park sewage treatment plants can convert organic matters into energy, thereby reducing the energy consumption of subsequent sewage treatment, reducing the sewage treatment cost of the industrial park and leading the overall sewage treatment of the industrial park to achieve real low carbon and environmental protection.
Drawings
FIG. 1 is a schematic flow diagram of an overall energy-saving method for sewage treatment in an industrial park according to the present invention.
Detailed Description
The invention is described below by means of specific embodiments. Unless otherwise specified, the technical means used in the present invention are well known to those skilled in the art. In addition, the embodiments should be considered illustrative, and not restrictive, of the scope of the invention, which is defined solely by the claims. It will be apparent to those skilled in the art that various changes or modifications in the components and amounts of the materials used in these embodiments can be made without departing from the spirit and scope of the invention. The raw materials and reagents used in the present invention are commercially available.
Example 1
(1) And (3) discharging the enterprise sewage after pretreatment: the sewage produced by enterprise production enters an enterprise internal sewage treatment facility for treatment, the key point is to remove toxic and harmful pollutants and reduce the removal of easily degradable organic pollutants as much as possible, and the enterprise sewage treatment facility is not provided with an aerobic biochemical section. After being pretreated, sewage of each enterprise in the park enters a sewage treatment plant at the tail end of the park for unified treatment;
(2) primary treatment: the sewage discharged by each enterprise enters a sewage treatment plant treatment process in an industrial park, primary treatment is started, namely physical treatment such as a grating, a grit chamber and the like, the hydraulic retention time is 2min, so as to remove the solid pollutants in a floating and suspended state in the sewage, and then the sewage enters subsequent reinforced primary treatment.
(3) Strengthening first-stage treatment: and (3) mechanically stirring, mixing and reacting the effluent and the return sludge for 15min, then performing sludge-water separation by settling for 60min, allowing the supernatant to enter a subsequent treatment process, and allowing the sludge to enter sludge anaerobic digestion to extract energy.
(4) High-load biochemical treatment: the supernatant obtained in the step (3) enters high-load biochemical treatment, is mixed and reacts with return sludge of a secondary sedimentation tank and a primary sedimentation tank for 30min, the sludge age is 0.5d, and the dissolved oxygen is 0.5mg/L, and in the section, pollutants are removed by taking the physical and chemical action as the dominant adsorption function, and organic matters and the like in the sewage are further transferred to the sludge and then enter subsequent sedimentation and separation;
(5) primary precipitation: high-load biochemical effluent flows into the section for precipitation separation, the precipitation time is 90min, supernatant enters a subsequent multistage AO process for treatment, 50% of sludge flows back to the high-load biochemical section, and 50% of sludge is discharged into the sludge for anaerobic digestion to extract energy.
(6) Multistage AO biochemistry: and (3) enabling the supernatant to enter a multistage AO biochemical treatment, wherein the hydraulic retention time of the section is 10hr, the sludge age is 15-20 d, organic substances, nitrogen, phosphorus and other plant nutrient substances in the sewage are basically removed to reach the standard discharge concentration of the effluent of a sewage treatment plant through the biological treatment taking the activated sludge as a main body in the section, and then the effluent enters a secondary sedimentation tank for separation.
(7) Secondary precipitation: and (3) allowing the multi-stage AO biochemical effluent to flow into the section for precipitation separation, wherein the precipitation time is 120min, allowing supernatant to enter subsequent advanced treatment, allowing 60% of sludge to flow back to the multi-stage AO biochemical treatment section, allowing 25% of sludge to flow back to the reinforced first-stage treatment section, allowing 15% of sludge to flow back to the high-load biochemical treatment section, and discharging other excess parts into sludge anaerobic digestion to extract energy.
(8) Deep treatment: and the secondary precipitated effluent enters an advanced treatment part to further degrade organic matters, phosphorus and suspended matters in the sewage, and is discharged to a natural water body after reaching the standard after being disinfected.
(9) Anaerobic digestion of sludge: the anaerobic sludge digestion system is provided with two A, B systems respectively, and sludge anaerobic digestion is respectively carried out on the sludge generated by the reinforced primary treatment and the subsequent sludge. The reason is that if the industrial wastewater contains toxic and harmful pollutants, the sludge subjected to the enhanced primary treatment can be treated as hazardous waste after anaerobic digestion, so that on one hand, the minimization of hazardous waste can be ensured, and on the other hand, the resource utilization of the subsequent sludge is not influenced. The two sludge treatment systems adopt medium-temperature digestion with T = 33-35 ℃, the digestion time is 30d, the sludge solid concentration is 10%, and after anaerobic digestion, energy recovery is carried out on methane; the supernatant returns to the front end of the sewage treatment system (namely primary treatment) for continuous treatment; and (3) determining a disposal mode by identification after the sludge discharged from the system A is stably dehydrated, and performing resource utilization after the sludge discharged from the system B is stably dehydrated.
Example 2 comparative experiment
And (4) conclusion:
(1) the invention considers the industrial park sewage integral treatment system, solves the problem of repeated construction of the aerobic biochemical process link of sewage treatment at the tail ends of enterprises and parks, omits the aerobic biochemical process in the sewage pretreatment process of the enterprises, reduces the sewage treatment investment and cost of the enterprises, simultaneously solves the problem of insufficient carbon source of the denitrification and denitrification section of the park sewage treatment plant, and provides good conditions for extracting energy sources for subsequent sewage.
(2) The invention sets reinforced one-stage treatment and two-stage adsorption flocculation transfer of organic matters and the like in a high-load biochemical section in the sewage treatment of the park, so as to be beneficial to more energy extraction from the sewage and the organic matters, reduce the operation load of the subsequent treatment process and reduce the energy consumption of the subsequent treatment.
(3) The invention does not add chemical agents, fully utilizes the adsorption and flocculation of the sludge, saves the treatment cost and avoids the generation of chemical sludge.
(4) The invention is provided with the mesophilic anaerobic digestion system, extracts energy from sludge, and is provided with two systems respectively, so that the recycling of the sludge is facilitated, and the amount of hazardous waste is reduced.
Claims (5)
1. An integral energy-saving method for sewage treatment of an industrial park is characterized by comprising the following steps:
(1) and (3) discharging the enterprise sewage after pretreatment: sewage produced by enterprise production enters an internal sewage treatment facility of an enterprise for treatment, and is discharged into a sewage treatment plant of a park for unified treatment after treatment;
(2) primary treatment: the method comprises the following steps of (1) enabling sewage to enter a grid firstly, separating floating objects in the sewage, enabling the sewage to enter a grit chamber, removing sand with large specific gravity in the sewage, enabling the sand to stay for 1-2 min by waterpower, and enabling the sewage to enter subsequent reinforced primary treatment;
(3) strengthening first-stage treatment: mixing the effluent and the return sludge in the step (2) for 10-20 min, then performing sludge-water separation by precipitation for 40-60 min, allowing the supernatant to enter a subsequent treatment process, and allowing the sludge to enter sludge anaerobic digestion to extract energy; the return sludge refers to sludge conveyed from a secondary sedimentation tank;
(4) high-load biochemical treatment: carrying out high-load biochemical treatment on the supernatant obtained in the step (3), mixing the supernatant with return sludge for 30min, wherein the sludge age is 0.3-0.5 d, and the dissolved oxygen is 0.7mg/L, further transferring organic matters in the sewage into the sludge, and then carrying out subsequent precipitation separation;
(5) primary precipitation: enabling the effluent in the step (4) to flow into the section for precipitation separation, wherein the precipitation time is 60-90 min, enabling the supernatant to enter a subsequent multistage AO biochemical process for treatment, enabling 50% of sludge to flow back to a high-load biochemical section, and discharging 50% of sludge into sludge for anaerobic digestion to extract energy;
(6) multistage AO biochemistry: performing multistage AO biochemical treatment on the supernatant in the step (5), wherein the hydraulic retention time of the section is 8-10 hr, the sludge age is 15-20 d, removing organic substances and nitrogen and phosphorus vegetative nutrient substances in the sewage through biological treatment taking activated sludge as a main body until the effluent of a sewage treatment plant reaches the standard discharge concentration, and then separating the effluent in a secondary sedimentation tank;
(7) secondary precipitation: enabling the effluent water in the step (6) to flow into the section for precipitation separation, wherein the precipitation time is 90-120 min, enabling supernatant fluid to enter subsequent advanced treatment, enabling 70-50% of sludge to flow back to multi-stage AO biochemical treatment, 20-30% of sludge to flow back to an enhanced first-stage treatment section, enabling 10-20% of sludge to flow back to high-load biochemical treatment, and discharging other surplus parts into sludge for anaerobic digestion and energy extraction;
(8) deep treatment: the effluent water in the step (7) enters an advanced treatment part to further degrade organic matters, phosphorus and suspended matters in the sewage, and is discharged to a natural water body after reaching the standard after being disinfected;
(9) anaerobic digestion of sludge: adopting two sludge anaerobic digestion systems of a system A and a system B to respectively treat the sludge generated by the enhanced primary treatment and other sludge; the two sludge treatment systems adopt medium-temperature digestion with T = 33-35 ℃ for 20-30 d, the solid concentration of the sludge is controlled to be 8% -12%, and after anaerobic digestion, energy recovery is carried out on the methane; the supernatant returns to the front end of the primary sewage treatment for continuous treatment; the treatment mode is determined by identifying the dewatered stable sludge discharged by the system A, and the resource utilization is carried out on the dewatered stable sludge discharged by the system B;
the method optimizes the pretreatment method of the sewage of the enterprise, does not set up aerobic biochemical process, discharges easily degradable organic pollutants to a tail-end sewage treatment plant for unified treatment, reduces the sewage treatment cost of the enterprise and the investment of sewage treatment facilities, simultaneously solves the problem of insufficient carbon source in the denitrification and denitrification section of the sewage treatment plant in a park and provides good conditions for extracting energy sources from the subsequent sewage;
wherein the park sewage treatment plant is provided with the organic matter adsorption flocculation transfer of high-load biochemical treatment, the flocculant is not added in the part of the adsorption flocculation, and the organic matter in the sewage is adsorbed and flocculated by the sludge of the reflux primary sedimentation tank and the secondary sedimentation tank.
2. The overall energy saving method of claim 1, wherein the park sewage treatment plant is provided with an enhanced primary treatment section which does not add a flocculating agent additionally, but adsorbs and flocculates organic matters in the sewage by refluxing the secondary precipitated sludge, thereby facilitating more energy extraction and reducing the operation load of the subsequent treatment process without generating chemical sludge.
3. The integrated energy saving method of claim 1, wherein the park sewage treatment plant is provided with two stages of organic adsorption flocculation transfer of enhanced primary treatment and high load biochemical treatment to extract more energy; meanwhile, the operation load of the subsequent treatment process is reduced, and the energy consumption of the subsequent treatment is reduced.
4. The integrated energy saving process for industrial park sewage treatment according to claim 1, wherein the process is primarily directed to industrial park sewage treatment with water volumes greater than 10 million tons/day.
5. The application of the overall energy-saving method for industrial park sewage treatment according to claim 1 in solving the problem of repeated construction of the aerobic biochemical process links for sewage treatment at the tail ends of enterprises and parks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611040373.7A CN106630388B (en) | 2016-11-24 | 2016-11-24 | Integral energy-saving method for sewage treatment of industrial park |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611040373.7A CN106630388B (en) | 2016-11-24 | 2016-11-24 | Integral energy-saving method for sewage treatment of industrial park |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106630388A CN106630388A (en) | 2017-05-10 |
| CN106630388B true CN106630388B (en) | 2020-05-22 |
Family
ID=58811367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611040373.7A Active CN106630388B (en) | 2016-11-24 | 2016-11-24 | Integral energy-saving method for sewage treatment of industrial park |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106630388B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107992973B (en) * | 2017-12-07 | 2021-05-28 | 天津大学 | Method for optimizing industrial park water pollution control scheme |
| CN108341560A (en) * | 2018-04-27 | 2018-07-31 | 江苏环集团有限公司 | A kind of Small Town Wastewater treatment process based on anaerobism MBR technology |
| CN110697807A (en) * | 2019-09-30 | 2020-01-17 | 天津大学 | Industrial park negotiation emission reduction feasibility assessment method based on Monte Carlo simulation |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997047561A1 (en) * | 1996-06-12 | 1997-12-18 | Bio Specific Systems, S.L. | Biological process for purifying liquid residues with high contaminating content and/or high toxicity, particularly liquid manures and dregs of oil |
| CN102718358A (en) * | 2012-06-08 | 2012-10-10 | 郑州梦溪环保科技有限公司 | Sewage treatment method |
| CN102826711A (en) * | 2012-08-23 | 2012-12-19 | 安徽省华鑫铅业集团有限公司 | Energy-saving and environmental-protection process flow of sewage treatment |
| CN104355504A (en) * | 2014-11-24 | 2015-02-18 | 富阳鸿祥技术服务有限公司 | Industrial wastewater treatment system |
| CN104803546A (en) * | 2015-03-25 | 2015-07-29 | 中国电器科学研究院有限公司 | Technology for reducing and recycling treatment of sludge of sewage treatment plant |
| CN204550197U (en) * | 2015-02-13 | 2015-08-12 | 中蓝连海设计研究院 | A kind for the treatment of unit being applicable to high density, difficult degradation organic nitrogen-containing waste water total nitrogen |
| CN204689842U (en) * | 2015-06-03 | 2015-10-07 | 福建广汇龙环保科技有限公司 | The ecological wastewater treatment system of vertical multistage AO |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7547394B2 (en) * | 2005-12-21 | 2009-06-16 | Zenon Technology Partnership | Wastewater treatment with aerobic granules |
| CN101462016B (en) * | 2007-12-17 | 2010-09-22 | 王绍文 | Return sludge flow type metafiltration pool for precipitating sludge |
-
2016
- 2016-11-24 CN CN201611040373.7A patent/CN106630388B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997047561A1 (en) * | 1996-06-12 | 1997-12-18 | Bio Specific Systems, S.L. | Biological process for purifying liquid residues with high contaminating content and/or high toxicity, particularly liquid manures and dregs of oil |
| CN102718358A (en) * | 2012-06-08 | 2012-10-10 | 郑州梦溪环保科技有限公司 | Sewage treatment method |
| CN102826711A (en) * | 2012-08-23 | 2012-12-19 | 安徽省华鑫铅业集团有限公司 | Energy-saving and environmental-protection process flow of sewage treatment |
| CN104355504A (en) * | 2014-11-24 | 2015-02-18 | 富阳鸿祥技术服务有限公司 | Industrial wastewater treatment system |
| CN204550197U (en) * | 2015-02-13 | 2015-08-12 | 中蓝连海设计研究院 | A kind for the treatment of unit being applicable to high density, difficult degradation organic nitrogen-containing waste water total nitrogen |
| CN104803546A (en) * | 2015-03-25 | 2015-07-29 | 中国电器科学研究院有限公司 | Technology for reducing and recycling treatment of sludge of sewage treatment plant |
| CN204689842U (en) * | 2015-06-03 | 2015-10-07 | 福建广汇龙环保科技有限公司 | The ecological wastewater treatment system of vertical multistage AO |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106630388A (en) | 2017-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102225825B (en) | Zero-energy-consumption enhanced AB (adsorption-biodegradation) treatment method for urban sewage | |
| CN111777179B (en) | A/O coupling sulfur autotrophic denitrification enhanced low-carbon-nitrogen-ratio sewage nitrogen and phosphorus removal device and method | |
| CN101935136B (en) | Zero energy consumption low sludge yield municipal sewage dephosphorization and denitrification treatment method | |
| CN105461174A (en) | Method for removing high ammonia nitrogen from pig farm dry manure cleaning livestock wastewater | |
| CN106630388B (en) | Integral energy-saving method for sewage treatment of industrial park | |
| CN210711175U (en) | Kitchen garbage anaerobic digestion waste water non-membrane method processing system | |
| CN103880253A (en) | Garbage leachate advanced treatment method and Fenton reaction tower | |
| CN112607963A (en) | System and method for reducing percolate concentrated solution of waste incineration plant | |
| CN113860637A (en) | Method and system for treating leachate of refuse transfer station in southern region | |
| CN105776751A (en) | Process for efficient separation of organic carbon source in sewage and energy development and utilization | |
| CN110642478A (en) | Coupled treatment system and method for coking phenol-cyanogen wastewater by biochemical method and physicochemical method | |
| CN101962247A (en) | Composite biological denitrification treatment method for ammonia-nitrogen wastewater | |
| CN212581728U (en) | Wastewater treatment system for sludge and blue-green algae synergistic deep dehydration | |
| CN211445412U (en) | Biochemical method and physicochemical method coupling treatment system for coking phenol-cyanogen wastewater | |
| CN203319825U (en) | Multi-point water inlet aeration anoxia and aerobiotic efficient denitrification and phosphorus removing system | |
| CN106915861B (en) | Coal chemical industry wastewater biological treatment system based on sludge ozone catalytic oxidation and treatment method thereof | |
| CN111333253A (en) | Method for treating leachate of waste incineration plant | |
| CN113998848B (en) | Ammonia distillation, gas water seal, rainwater and sludge filtrate mixed wastewater treatment system and method | |
| CN106746178B (en) | Advanced sewage denitrification process based on chemical separation-physical transfer of nitrate and nitrogen | |
| CN112194312B (en) | Enhanced denitrification system and method for landfill leachate | |
| CN212050998U (en) | Cassava starch effluent treatment plant | |
| CN110040848B (en) | Method for realizing treatment of inorganic wastewater containing ammonia nitrogen and sulfate based on sulfur cycle | |
| CN111807626A (en) | Wastewater treatment system and process for sludge and blue-green algae synergistic deep dehydration | |
| CN207891216U (en) | A kind of processing system of high-concentration hardly-degradable pharmacy waste water | |
| CN112429913A (en) | High-concentration wastewater treatment system and high-concentration wastewater treatment process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210517 Address after: 300191 No. 17, rehabilitation Road, Tianjin, Nankai District Patentee after: Tianjin Institute of ecological and Environmental Sciences Address before: 300192 No. 17, rehabilitation Road, Tianjin, Nankai District Patentee before: TIANJIN ACADEMY OF ENVIRONMENTAL SCIENCES |
|
| TR01 | Transfer of patent right |