CN114716018A - Integrated sewage treatment system and process - Google Patents
Integrated sewage treatment system and process Download PDFInfo
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- CN114716018A CN114716018A CN202210378767.2A CN202210378767A CN114716018A CN 114716018 A CN114716018 A CN 114716018A CN 202210378767 A CN202210378767 A CN 202210378767A CN 114716018 A CN114716018 A CN 114716018A
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- 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
Abstract
The invention belongs to the technical field of sewage treatment, and relates to an integrated sewage treatment system and process. The utility model provides a rural sewage treatment system need set up precipitation devices such as two heavy ponds or sludge impoundment at the end of giving out water among the prior art, the monomer structures that lead to are many, area is difficult to the technical problem who reduces, this application provides an integration sewage treatment system, with the delivery port setting in batch formula biomembrane reaction unit lower part, apart from bottom 1/10 ~ 1/5 department to fill and place a plurality of elastic packing, need not to set up the precipitation device, the monomer structures are few, the integration degree is high, area is little. The application also provides an integrated sewage treatment process, which combines a biofilm method and a sequencing batch treatment mode with drainage self-filtration, and does not need to set precipitation time in the treatment process.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to an integrated sewage treatment system and process.
Background
With the rapid development of rural economy in recent years, the rural domestic water consumption is greatly improved, but the rural sewage discharge problem is more and more prominent due to numerous rural population and weak environmental awareness, and a large amount of sewage is not effectively treated and directly discharged in an unorganized manner, so that the rural environment is seriously polluted, and the health problem of vast rural population is directly or indirectly influenced. Rural sewage has characteristics such as sewage water source dispersion, pipe network collection system are not sound, sewage quality water yield changes greatly and pollutant concentration is higher in the sewage, if unified the processing with rural domestic sewage is collected in unison, need build sewage pipe network collection system in a large scale, ton water cost is big and lack professional operation personnel and lead to the operation maintenance difficulty scheduling problem, and rural sewage still can not obtain economic effectual processing.
At present, most of common rural sewage treatment equipment adopts traditional biochemical water treatment processes, such as an MBR (membrane bioreactor) membrane method, a biological contact oxidation method and the like. The invention discloses a Chinese patent application publication No. CN112079528A, which is a centralized treatment type rural sewage treatment method, and the method is characterized in that waste water from a rural sewage pipe network is sent into a mechanical grid to isolate garbage in the water; stirring and pre-aerating the wastewater in an adjusting tank, and delivering the treated water into a methane tank for fermentation treatment; removing BOD in water in the anoxic reaction tank; degrading organic matters in the water in the aerobic gas reaction tank; the secondary sedimentation tank separates the sludge and the supernatant from the incoming water. The scheme improves the treatment efficiency of rural waste water and improves the recycling rate. However, although the sludge production amount is small, facilities such as a secondary sedimentation tank, a sludge tank and the like are still required to be arranged at the water outlet end, the number of single structures is large, and the occupied area is difficult to reduce. Also like Chinese patent application publication No. CN111908607A, the invention is named as a system suitable for treating rural sewage, and the disclosed method comprises a biological rotating disc tank, an anoxic tank, an anaerobic tank, a biological contact oxidation tank and a filter tank which are connected in sequence, wherein a first mixed liquid return pipe is arranged between the biological rotating disc tank and the anaerobic tank, and a second mixed liquid return pipe is arranged between the biological contact oxidation tank and the anoxic tank. In the process of treating sewage, three times of denitrification and three times of dephosphorization are realized, and the TP and TN values of the sewage are greatly reduced by multi-section denitrification and dephosphorization, so that the sewage reaches the discharge standard. But biological phosphorus removal is difficult to reach corresponding indexes, chemical phosphorus removal is used as a back-end technical guarantee in general process design, a coagulation structure agent precipitation structure is further added, a precipitation stage is required to be added in an operation section, and therefore equipment occupation and investment operation cost are improved. In addition, the operation and maintenance management of part of processes is complex, the requirement on the operation capacity of personnel is high, and the labor cost is high.
Chinese patent application publication No. CN1450004A entitled method for synchronous nitrification and denitrification treatment of municipal sewage by sequencing batch biofilm process discloses a method including four stages of anaerobic cycle water feeding, aerobic aeration, sedimentation, water drainage and the like, the operation process of the method is anaerobic/aerobic, and organic matter removal, nitrogen and phosphorus removal can be carried out in one reaction device. The method is characterized in that the anaerobic cycle time is 3-4 hours, the aerobic aeration time is 3-5 hours, the sedimentation time is 0.5-1 hour, and the drainage time is 0.3-0.5 hour. However, the process needs to set a separate settling time, and adopts a lower drainage mode, so that the settled drainage is easy to carry the sludge out of the system, and the effluent index exceeds the standard.
Disclosure of Invention
1. Problems to be solved
The utility model provides a rural sewage treatment system need set up precipitation devices such as two heavy ponds or sludge impoundment at the end of giving out water among the prior art, leads to the monomer structures many, and area is difficult to the technical problem who reduces, this application provides an integration sewage treatment system, sets up the delivery port in the batch biofilm reactor lower part simultaneously, fills and places a plurality of elastic filler, need not to set up the precipitation device, and the monomer structures are few, and the integration degree is high, and area is little. The application also provides an integrated sewage treatment process, which combines a biofilm method and a sequencing batch treatment mode with drainage self-filtration, and does not need to set precipitation time in the treatment process.
2. Technical scheme
In order to achieve the purpose, the technical scheme is as follows:
the integrated sewage treatment system comprises a sequencing batch biofilm reaction device, wherein the sequencing batch biofilm reaction device is provided with a water outlet, and the distance between the water outlet and the bottom of the sequencing batch biofilm reaction device is 1/10-1/5 of the height of the sequencing batch biofilm reaction device;
a plurality of elastic fillers are placed in the sequencing batch biofilm reaction device, and the filling volume of the fillers is 85-95% of the volume of the sequencing batch biofilm reaction device.
Preferably, the filling volume of the filler is 90-95% of the volume of the sequencing batch biofilm reactor.
Preferably, the water inlet is arranged at the bottom of the sequencing batch biofilm reactor, and the distance from the water inlet to the bottom is 1/10-1/5 of the height of the sequencing batch biofilm reactor.
By placing the elastic filler in the integrated sewage treatment system, a large number of microorganisms are attached to the surface of the filler to grow and breed, and by utilizing the characteristic of small particle size of the filler and the biological flocculation effect of a biological membrane, the pollutants in the sewage are intercepted, the higher microorganism concentration in a biochemical system is ensured, the pollutant treatment load is improved, the treatment flux is increased, and the hydraulic time is shortened. The system stability can be improved, the sludge bulking risk can be reduced, and the impact load resistance can be improved; and the device can also drain water and filter simultaneously, so that the precipitation device and the precipitation time of the water outlet end of the device are reduced.
The water outlet is arranged at the lower part of the sequencing batch biofilm reactor, and the mode can ensure that sludge is fully intercepted in the filler along with the ascending process of sewage in the water outlet process of the equipment, so that suspended matters in the outlet water reach the standard.
The integrated sewage treatment system does not need to be provided with a secondary sedimentation tank or a sludge tank or other sedimentation devices, and has few monomer structures and small occupied area.
Further, the elastic filler is one or more of polyurethane filler or modified polymer filler.
Sequencing batch biofilmThe reaction device is internally provided with an elastic filler as a carrier: 1. the three-dimensional elastic filler has high mechanical toughness, resists the friction collision and hydraulic shearing action among the fillers and has low wear rate; 2. the surface and the interior are rough, the hydrophilicity is good, the porosity is over 95 percent, and the specific surface area can reach 10000m2/m3(ii) a 3. In the nitration reaction system, the carrier can play a role in cutting and blocking bubbles, so that the retention time of the bubbles in a water body and the contact surface area of gas and liquid are greatly increased, and the mass transfer efficiency is improved; 4. the microorganism interception capacity is strong, suspended matters in water can be intercepted while water is discharged in the drainage process, and the water discharge effect is good.
The high porosity of the elastic filler is suitable for the growth of microorganisms, sewage flows through the filler and is fully contacted, and the sewage is quickly purified by utilizing the strong degradation capability of high-concentration biomass on the filler; in addition, the biological film intercepts pollutants in the sewage by utilizing the characteristic of smaller particle size of the filler and the biological flocculation of the biological film. Through the characteristic of mutual combination of the two functions, the treatment system can effectively remove pollutants in the sewage in the biochemical operation stage. After biochemical stage treatment is completed, a drainage valve is directly opened for drainage, and the filler intercepts pollutants and suspended matters generated in water in the drainage process, so that the filtration is changed from drainage to drainage, a precipitation device is not required to be arranged at the tail end, and the precipitation time is not required to be specially set in the operation process.
Further, when the elastic filler is a polyurethane filler, the size of the polyurethane filler is a cube with the side length of 20-30 mm; when the filler is a modified polymer filler, the modified polymer filler is a cylinder with the diameter of 5-25 mm and the length of 5-10 mm.
Preferably, the elastic polyurethane filler is a cube with a side length of 25 mm.
Preferably, the polymer filler is a cylinder with the diameter of 25mm and the length of 10 mm.
Furthermore, the system also comprises a regulation pool and a lifting device, wherein the regulation pool, the lifting device and the sequencing batch biofilm reaction device are sequentially connected; the lifting water amount of the lifting device is 10-15 times of the treatment amount of the sequencing batch biofilm reactor.
Preferably, the lifting device mainly comprises a lifting pump station and a grid, the lifting pump lifts the sewage into the sequencing batch biofilm reactor, the grid intercepts larger suspended matters in the sewage, and the lifting pump selects a large-square high-lift water pump to realize rapid water inflow.
Preferably, when the sequencing batch biofilm reactor with small volume (less than 200 square), the volume of the storage tank is set to be 20-24 h of water inflow; when the sequencing batch biofilm reactor with large volume (200 square and above) is used, in order to avoid the oversize of the regulating storage tank, the volume of the regulating storage tank is set to be 12-15 h of water inflow. By the design, the problem that the water pump is blocked due to continuous small-volume water inflow is avoided, the later-stage shutdown maintenance frequency is reduced, and the large-volume short-time water inflow is low in energy consumption due to the continuous small-volume water inflow. The system stability is improved, the impact load resistance is strong, and the system is suitable for use scenes with unstable water yield and unstable water quality of rural sewage.
Furthermore, the system also comprises a return pipeline arranged between the sequencing batch biofilm reactor and the regulating and storing tank.
Furthermore, the device also comprises a dosing device arranged in the sequencing batch biofilm reaction device.
Preferably, the system also comprises a back washing device arranged in the sequencing batch biofilm reactor.
An integrated sewage treatment process, which is used for the integrated sewage treatment system, and comprises the following steps:
pumping the sewage stored in the storage tank into the sequencing batch biofilm reactor through a lifting device and then carrying out anoxic reaction to obtain sewage subjected to anoxic treatment;
carrying out aerobic reaction on the sewage subjected to the anoxic treatment to obtain the sewage subjected to the aerobic treatment;
and directly discharging the sewage subjected to aerobic treatment through the water outlet without precipitation treatment.
Further, the method also comprises the step of refluxing supernatant liquid of the sewage after aerobic treatment to a regulation and storage tank.
Further, the water inlet time is 15-30 min; the anoxic and aerobic reaction time is 3-5 h; the drainage time is about 10-15 min.
Further, the method also comprises a step of adding drugs after the aerobic treatment step.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) according to the integrated sewage treatment system, the water outlet is arranged at the lower part of the sequencing batch biofilm reactor, the distance between the water outlet and the bottom is 1/10-1/5 of the height of the sequencing batch biofilm reactor, a plurality of elastic fillers are placed in the sequencing batch biofilm reactor, and the filling volume of the fillers is 85-95% of the volume of the sequencing batch biofilm reactor. In the system, the filler is added as a biological carrier, sewage flows through the filler and is fully contacted, and the sewage is rapidly purified by utilizing the strong degradation capability of high-concentration biomass on the filler; meanwhile, by utilizing the characteristic of smaller particle size of the filler and the biological flocculation effect of the biological membrane, the biological membrane intercepts pollutants in the sewage, and filters while draining, and a settling device is not required to be arranged at the tail end of the system, so that the equipment is low in overall cost, low in energy consumption, small in occupied area, high in stability and strong in impact load resistance.
(2) The integrated sewage treatment process can be summarized as follows: compared with the existing rural sewage treatment process, the treatment process does not need to set the sedimentation time, the treated water body is discharged and filtered at the same time, the precipitation is finished when the discharge of the discharged water is finished, and the water inlet pump can be started to start the next batch of treatment after the drainage is finished. The water inlet time is 15-30 min; the anoxic reaction time is 3-5 h; the water discharge time is about 10-15 min, i.e. the processing time of each batch is about 4-6 h, and 4-6 batches can be processed every day.
Drawings
FIG. 1 is a schematic view of the operation of an integrated sewage treatment process;
FIG. 2 is a schematic view of an integrated wastewater treatment process.
Detailed Description
For a further understanding of the contents of the present invention, reference will now be made in detail to the following examples.
Example 1
The integrated sewage treatment system of the embodiment comprises the following devices:
the device comprises a regulation storage pool, a lifting device and a sequencing batch biofilm reactor which are connected in sequence, wherein the size of the sequencing batch biofilm reactor is B H-phi 2200 mm-2000 mm, and the effective volume of the device is 6.7m3. The water inlet is 200mm away from the bottom of the device, and the water outlet is 180mm away from the bottom of the sequencing batch biofilm reactor.
The filling volume of the filler in the equipment is 6m3The filler is square frame polyurethane filler with the size of 25 × 25 mm.
The lifting water quantity of the lifting device is 15 times of the treatment quantity of the sequencing batch biofilm reactor. The lifting device mainly comprises a lifting pump station and a grid, the lifting pump lifts the sewage into the sequencing batch biofilm reaction device, the grid intercepts larger suspended matters in the sewage, and the lifting pump selects a large-square high-lift water pump to realize rapid water inflow.
The embodiment also comprises a return pipeline arranged between the sequencing batch biofilm reactor and the regulating and storing tank, and a dosing device arranged in the sequencing batch biofilm reactor.
The system can be highly combined with an automatic control system, and unattended stations can be realized.
Example 2
The integrated sewage treatment system of the embodiment is basically the same as that of embodiment 1, except that the filling volume of the filler in the equipment is 5.7m3At this time, the equipment filling rate is 85%; the size of the filler is 20 x 20mm, and the water outlet is 400mm away from the bottom of the sequencing batch biofilm reactor. The lifting water quantity of the lifting device is 10 times of the treatment quantity of the sequencing batch biofilm reactor.
Example 3
The integrated sewage treatment system of this embodiment is substantially the same as embodiment 1, except that the elastic filler of this embodiment is modifiedHigh-molecular filler HDPE (high-density polyethylene filler), the filling volume of the filler in the equipment is 6.4m3. The filler size is
The filler has the density of 0.95g/cm3, is close to water, and can be suspended in water well after film hanging without sinking and floating.
Comparative example 1
An integrated wastewater treatment system of this comparative example was substantially the same as example 1 except that the equipment used polyurethane filler size was 10 x 10 mm. The distance between the water outlet and the bottom of the sequencing batch biofilm reactor is 1000 mm.
Comparative example 2
The integrated sewage treatment system of the comparative example is basically the same as that in the example 1, except that the equipment adopts the traditional ceramsite filler as the filler. The filler size is 5mm, the filling height is 0.8m, and the filling volume is 3.5m3。
Comparative example 3
The integrated sewage treatment system of the comparative example is basically the same as that of example 1, except that the equipment adopts a filler with a filling volume of 3m3The packing percentage was 45%.
Example 4
An integrated wastewater treatment process of this example used the system of example 1.
When the first batch begins, the regulation pond top level gauge begins to read the regulation pond liquid level, and when the liquid level was greater than and sets up safe liquid level, system hoisting device opened, when the formula biofilm reactor top probe level gauge of the formula biofilm reactor of the preface detects the formula biofilm reactor liquid level of preface and reaches and predetermine the reaction liquid level, closed hoisting device. And (3) the system stands and starts an anoxic reaction stage, when the anoxic reaction is finished, the automatic control system turns on the blower to start aeration, the system enters an aerobic treatment stage along with the continuous rising of dissolved oxygen of the sewage, and after the set aerobic treatment time, the system turns on the PAC dosing pump in the last five minutes of the aerobic stage, and the PAC is fully reacted in the system through aeration. After the coagulation time is set, detecting the liquid level of the storage tank by a liquid level meter at the top of the storage tank, and when the water level in the storage tank is higher than the set lowest water inlet liquid level, opening a valve of a water outlet by the system, and discharging supernatant out of the system; when the water level in the regulating and storing tank is lower than the set lowest water inlet liquid level, the system is communicated with a return pipeline, supernatant liquid returns to the regulating and storing tank and is continuously mixed with residual sewage in the regulating and storing tank, and then returns to the system to participate in reaction, so that the condition that the system does not have water inlet is avoided.
In the process of system drainage, when a liquid level meter at the top of the sequencing batch biofilm reactor monitors that the liquid level in the system reaches the designed lowest liquid level, a water outlet valve is closed, the first batch of treatment is finished, and then water inlet is started for the next batch.
A large amount of nitrates which are reserved in the sequencing batch biofilm reaction device from the previous batch aerobic nitrification stage are reserved in the original sewage of the system, the inlet water is fully mixed with the original sewage in the system, the mixed liquid takes organic matters in the sewage as a carbon source, and denitrification is carried out in the process of an anoxic reaction system to achieve the purpose of removing total nitrogen; according to the operation condition, after the anoxic reaction time is reached, the aeration system is started, the concentration of the dissolved oxygen in the system is continuously increased, and the aerobic reaction stage is started. After aeration is added in the aerobic stage, the sewage further degrades organic matters, and mainly carries out nitrification of ammonia nitrogen and removal of partial COD. And after the reaction time of the aerobic system is reached, the aeration system is closed, the water outlet valve is opened, and the effluent is discharged out of the system through the water outlet.
Except for the normal treatment process, the system needs to be backwashed regularly, and generally the system is backwashed once in about 7-10 days according to the water quality condition. When the system detects that the total water inflow amount in the backwashing period reaches the set water inflow amount of 7-10 days, the system automatically performs backwashing before the next batch. And (3) backwashing: after the last batch is finished, the aeration valve is closed, the backwashing valves on the two sides are opened, the lift pump is opened, the fan is simultaneously opened, after the backwashing time is set, the fan and the backwashing valve are closed, the emptying valve is opened to empty into the sludge concentration tank, and the sludge in the concentration tank is periodically pumped and discharged.
In the embodiment, the sewage to be treated is typical rural sewage, and the water inlet parameters mainly comprise Chemical Oxygen Demand (COD), ammonia nitrogen, Total Phosphorus (TP) and Suspended Solids (SS). The rural sewageThe water inlet amount is 10m3And d, meeting the conventional rural sewage discharge characteristics, and always generating no water or intermittent water inflow. The water quality of the inlet water is designed to be less than or equal to 250mg/L of COD, less than or equal to 40mg/L of ammonia nitrogen, less than or equal to 4mg/L of TP and less than or equal to 200mg/L of SS. The water quality indexes of the designed effluent are that COD is less than or equal to 100mg/L, ammonia nitrogen is less than or equal to 25mg/L, TP is less than or equal to 3mg/L, and SS is less than or equal to 30 mg/L.
Sewage gets into the formula of prefacing by bottom water inlet behind the most solid impurity is got rid of behind the grid by hoisting device, and the fan provides oxygen for formula of prefacing formula biomembrane reaction device, and the microorganism carries out nitration under the aerobic condition and realizes getting rid of ammonia nitrogen and COD's getting rid of. And after the aerobic state is operated for a certain time, closing the fan system, opening the water outlet valve, discharging clear water out of the sequencing batch biofilm reaction device through the lower water outlet, and intercepting while the clear water is discharged out of the sequencing batch biofilm reaction device, wherein total phosphorus and suspended matters in the sewage are intercepted in the sequencing batch biofilm reaction device in a sludge form by the filler, so that two pollutants are removed. And after the system is precipitated, discharging supernatant, and periodically emptying sludge into a sludge collection tank.
The detection result of the inlet and outlet water shows that the ammonia nitrogen of the inlet water is about 46.9mg/L, the TP is about 4mg/L, the COD is about 360mg/L, the SS is about 120mg/L, the ammonia nitrogen of the outlet water is about 6mg/L, the TP is about 2.1mg/L, the COD is about 15mg/L, and the SS is about 13 mg/L. The high integrated design of each reaction stage can effectively remove each pollutant in the sewage and ensure that the effluent stably reaches the standard.
Example 5
The integrated sewage treatment system of the embodiment is basically the same as the embodiment 4, except that the system needs to examine the total nitrogen index, and the system comprises an anoxic reaction system. The method is suitable for scenes with total nitrogen index and low total phosphorus effluent requirement.
When the total nitrogen index is set in the water to be treated, on the basis of the embodiment 4, an anoxic reaction stage is added before the aerobic reaction stage, and the indexes such as total nitrogen, ammonia nitrogen, total phosphorus, SS and the like are removed in a sequential batch treatment mode of an anoxic reaction stage and an aerobic reaction stage.
After the sewage enters the system, an anoxic reaction is started, the original sewage of the system contains a large amount of nitrates which are remained in the system from the previous aerobic nitrification stage, the inlet water is fully mixed with the original sewage in the system, and the mixed liquid takes organic matters in the sewage as a carbon source to carry out denitrification in the process of an anoxic reaction system so as to achieve the purpose of removing total nitrogen; according to the operation condition, after the anoxic reaction time is reached, the aeration system is started, and the system enters an aerobic reaction stage. After aeration is added in the aerobic stage, the sewage further degrades organic matters, and mainly carries out nitrification of ammonia nitrogen and removal of COD. After the biochemical treatment is finished, the drainage valve is opened, and pollutants are intercepted while drainage is carried out.
Example 6
The integrated wastewater treatment process of this example is substantially the same as example 4, except that the system of example 2 is used.
The water to be treated in the embodiment is typical rural sewage, and the water inlet parameters mainly comprise Chemical Oxygen Demand (COD), ammonia nitrogen, Total Phosphorus (TP) and Suspended Solids (SS). The inlet water amount of the rural sewage is 10m3And d, meeting the conventional rural sewage discharge characteristics, and always generating no water or intermittent water inflow. The water quality of the inlet water is designed to be less than or equal to 200mg/L of COD, less than or equal to 35mg/L of ammonia nitrogen, less than or equal to 4mg/L of TP and less than or equal to 200mg/L of SS. The water quality indexes of the designed effluent are that COD is less than or equal to 100mg/L, ammonia nitrogen is less than or equal to 20mg/L, TP is less than or equal to 3mg/L, and SS is less than or equal to 30 mg/L.
After the embodiment adopts the filling rate and the filler size to treat the sewage, the ammonia nitrogen of the effluent is about 10.6mg/L, the TP is about 2.3mg/L, the COD is about 63mg/L, the SS is about 21mg/L when the sewage starts to run, and the effluent can stably reach the standard.
Example 7
The integrated wastewater treatment process of this example is substantially the same as example 6, except that the system of example 3 is used.
The same situation as that of the water quality and the water quantity treated in the embodiment 6, after the sewage is treated by adopting the filling rate and the filler size in the embodiment, the ammonia nitrogen of the effluent is about 16.6mg/L, the TP is about 2.2mg/L, the COD is about 49mg/L, and the SS is about 27mg/L when the sewage starts to run, so that various pollutants in the sewage can be effectively removed, and the effluent stably reaches the standard.
Comparative example 4
An integrated sewage treatment system of this comparative example is substantially the same as example 4, except that the filler of comparative example 2 is used.
The same conditions as those of the water quality and the water quantity treated in the embodiment 4 are adopted, after the sewage is treated by adopting the ceramsite filler, the ammonia nitrogen of the effluent is about 9.6mg/L, the TP is about 2.4mg/L, the COD is about 49mg/L, the SS is about 24mg/L when the sewage starts to run, and the effluent can stably reach the standard. After the equipment runs for a period of time, the inside of the ceramsite filler is blocked, the sewage treatment efficiency is obviously reduced, the ammonia nitrogen in the effluent is about 19.5mg/L, the TP is about 2.9mg/L, the COD is about 87mg/L, the SS is about 31.6mg/L, the effluent index is obviously increased, and the effluent of the system occasionally does not reach the standard.
Compared with the comparative example 4, the polyurethane filler in the agricultural sewage system has higher porosity, smaller gaps and easier attachment of microorganisms compared with ceramsite, volcanic rock filler and the like. Therefore, in the filler with the same volume, the concentration of the polyurethane filler and the microorganisms is higher than that of the ceramsite filler, the treatment efficiency is higher, and the concentration of effluent pollutants is lower under the same condition. In addition, the ceramsite filler has high self weight, high requirement on wind pressure and water pressure in the backwashing process, incomplete backwashing is easy to occur, and the filler is easy to block, so that the subsequent effluent is easy to not reach the standard.
Comparative example 5
The integrated sewage treatment system of the comparative example is basically the same as that in example 4, except that the water outlet is arranged at a middle upper position in the side wall of the box body, and the distance from the water outlet to the top of the equipment is 300 mm. The operation mode adopted in the comparative example 4 is the same as that of the example 4, and after sewage sequentially passes through the lifting system, the grating and the aerobic system, the effluent of the equipment is discharged outside. When the mode of upper drainage is adopted for treatment, a water inlet valve needs to be opened, the clear water of the previous batch of treatment is ejected out of the system through continuous water inlet, the ammonia nitrogen of the outlet water is about 21mg/L, the TP is about 2.6mg/L, the COD is about 75mg/L, the SS is about 24mg/L, the outlet water can reach the standard, but the concentration of the outlet water pollutants is higher.
Compared with the comparative example 5, the embodiment 4 shows that compared with the lower drainage mode and the upper drainage mode, the filler has better pollutant interception effect in the system and more stable water outlet in the agricultural sewage system. Therefore, in the same treatment system, the interception effect of the polyurethane filler can be better embodied by adopting a drainage mode, pollutants are intercepted in the system, and the water outlet of the system is more stable.
Comparative example 6
An integrated wastewater treatment system of this comparative example was substantially the same as example 4, except that the filler of comparative example 1 was used in a size corresponding thereto.
The operation mode adopted in the comparative example 6 is the same as that of the example 4, and after sewage sequentially passes through the lifting system, the grating and the aerobic system, the effluent of the equipment is discharged outside. After the sewage is treated by adopting a drainage mode, the ammonia nitrogen of the effluent is about 11mg/L, the TP is about 2.1mg/L, the COD is about 45mg/L, the SS is about 26mg/L, the effluent can reach the standard, but the SS index has overproof risk. In addition, because the size of the filler is small, the filler is seriously abraded due to mutual friction and solarization among the fillers in the using process, and the filler needs to be supplemented or replaced regularly.
Compared with the comparative example 6, the agricultural sewage system adopting the filler with smaller size has the advantages that the pollutant interception effect of the filler on the system is poor, the effluent is unstable, and the abrasion condition of the filler is more prominent. Therefore, in the same treatment system, the proper filler size is adopted, pollutants are more effectively trapped in the system, and the system effluent is more stable.
Comparative example 7
An integrated sewage treatment system of this comparative example is substantially the same as example 4, except that the filler of comparative example 3 having a filling rate corresponding thereto was used.
The operation mode adopted in the comparative example 7 is the same as that of the example 4, and after sewage sequentially passes through the lifting system, the grating and the aerobic system, the effluent of the equipment is discharged outside. After the sewage is treated by adopting a drainage mode, the ammonia nitrogen of the discharged water is about 23mg/L, TP is about 3.2mg/L, COD is about 79mg/L, SS is about 36mg/L, and the discharged water can not stably reach the standard.
In the agricultural sewage system, when the filling rate of the filler in the treatment system is low, on one hand, the microorganisms in the treatment system are few, and the pollutants in the sewage cannot be stably removed, so that various water quality indexes are high, and on the other hand, when the filling rate of the filler is low, the effect of intercepting the pollutants in the system by the filler is poor, and the effluent is unstable. Therefore, in the same treatment system, the appropriate filling rate of the filler is adopted, so that the corresponding pollutants are more effectively removed and trapped in the system, and the effluent of the system is more stable.
Example 1 is the best mode, example 2 is the lowest value mode within the practical range, example 3 is the highest value mode within the practical range, example 3 is the mode of adopting the lowest water outlet point, example 4 is the best mode corresponding to the specific system and the operation mode thereof, and example 5 is to add an anoxic reaction system on the basis of the examples. Comparative example 1 is an embodiment that does not satisfy the size of the filler, comparative example 2 is an embodiment that does not satisfy the kind of the filler, comparative example 3 is an embodiment that does not satisfy the filling ratio of the filler, and comparative example 4 is a specific system and its operation data in the case of using the filler of comparative example 2. Comparative example 5 is the specific system and its operating data when the outlet height does not meet the range, and comparative example 6 is the specific system and its operating data in the case of using the filler size of comparative example 1. Comparative example 7 is a specific system and its operating data using the filler fill rate of comparative example 3. Comparing the examples with the comparative examples, it can be seen that the water quality of the effluent is better and the effluent is more stable in the embodiment of the examples.
The above examples are merely representative of preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that various changes, modifications and substitutions may be made by those skilled in the art without departing from the spirit of the invention, and all are intended to be included within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An integrated sewage treatment system, the system comprises a sequencing batch biofilm reaction device, and is characterized in that:
the sequencing batch biofilm reactor is provided with a water outlet, and the distance between the water outlet and the bottom of the sequencing batch biofilm reactor is 1/10-1/5 of the height of the sequencing batch biofilm reactor;
a plurality of elastic fillers are placed in the sequencing batch biofilm reaction device, and the filling volume of the fillers is 85-90% of the volume of the sequencing batch biofilm reaction device.
2. The integrated wastewater treatment system according to claim 1, wherein: the elastic filler is one or more of polyurethane filler or modified polymer filler.
3. The integrated wastewater treatment system according to claim 2, wherein: when the elastic filler is a polyurethane filler, the size of the polyurethane filler is a cube with the side length of 20-30 mm; when the filler is a modified polymer filler, the modified polymer filler is a cylinder with the diameter of 5-25 mm and the length of 5-10 mm.
4. The integrated wastewater treatment system according to claim 1, wherein: the system also comprises a regulation and storage tank and a lifting device, wherein the regulation and storage tank, the lifting device and the sequencing batch biofilm reaction device are sequentially connected; the lifting water amount of the lifting device is 10-15 times of the treatment amount of the sequencing batch biofilm reactor.
5. The integrated wastewater treatment system according to claim 1, wherein: the system also comprises a return pipeline arranged between the sequencing batch biofilm reactor and the regulating and storing tank.
6. The integrated wastewater treatment system according to claim 1, wherein: the device also comprises a dosing device arranged in the sequencing batch biofilm reaction device.
7. An integrated wastewater treatment process using the integrated wastewater treatment system according to any one of claims 1 to 6, wherein: the method comprises the following steps:
pumping the sewage stored in the storage tank into the sequencing batch biofilm reactor through a lifting device and then carrying out anoxic reaction to obtain sewage subjected to anoxic treatment;
carrying out aerobic reaction on the sewage subjected to the anoxic treatment to obtain the sewage subjected to the aerobic treatment;
and directly discharging the sewage subjected to aerobic treatment through the water outlet without precipitation treatment.
8. The integrated wastewater treatment process according to claim 7, wherein: also comprises the step of taking supernatant from the sewage after the aerobic treatment and refluxing the supernatant to a regulation and storage tank.
9. The integrated sewage treatment process according to claim 7, wherein: the water inlet time is 15-30 min; the anoxic and aerobic reaction time is 3-5 h; the drainage time is about 10-15 min.
10. The integrated wastewater treatment process according to claim 7, wherein: also comprises a step of adding drugs after the aerobic treatment step.
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