CN106477829B - Animal carcass harmless wastewater treatment system and wastewater treatment method - Google Patents
Animal carcass harmless wastewater treatment system and wastewater treatment method Download PDFInfo
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- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
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- 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 discloses an animal carcass harmless wastewater treatment system and a wastewater treatment method, wherein the system comprises a wastewater pretreatment unit, a hydrolysis acidification reactor and an MBBR-MBR combined biological treatment unit; the wastewater pretreatment unit comprises an ozone catalytic oxidation reactor, an activated sludge adsorption reactor and an ammonia nitrogen stripping absorption tower; the MBBR-MBR combined biological treatment unit comprises an anoxic moving bed biological membrane reactor, an aerobic moving bed biological membrane reactor and an MBR membrane biological reactor, wherein aeration devices are respectively arranged in the aerobic moving bed biological membrane reactor and the MBR membrane biological reactor, and a digestive fluid return pipeline is arranged between the MBR membrane biological reactor and the anoxic moving bed biological membrane reactor. The method comprises the steps of pretreatment, hydrolytic acidification and biological treatment. By adopting the system and the method, the waste water generated in the innocent treatment process of the animal carcasses can be sterilized and disinfected, the system and the method are suitable for the characteristics of the waste water of the innocent treatment of the animal carcasses, and the ammonia nitrogen removal rate is high.
Description
Technical Field
The invention relates to the technical field of animal carcass harmless wastewater treatment, in particular to an animal carcass harmless wastewater treatment system and an animal carcass harmless wastewater treatment method.
Background
Performing innocent treatment on the livestock, poultry and animal carcasses with disability by adopting a drying method (hot steam is not in direct contact with the meat carcasses made by chemical conversion and circulates in an interlayer), wherein the hot steam generated in the chemical conversion process contains various organic matters, nitrogen, grease, volatile malodor (VOCs) and the like with lower boiling points in the livestock, poultry and animal carcasses with disability to form dirty steam, the dirty steam is condensed by a vacuum pump station to generate wastewater, and the main pollutants of pollution factors in the wastewater are CODCr, BOD5, NH3-N, animal oil, volatile organic matters VOCs and the like; in addition, the flushing sewage of the primary carrying, tearing and crushing working procedures of innocent treatment of the livestock, the poultry and the carcasses contains a certain amount of polluted wastewater (raw water), and the two wastewater streams are collected in a wastewater regulating tank for treatment. The biodegradability of the wastewater is still (B/C=0.34) obtained by analyzing the raw water properties, and the pollution sources of high carbon, high nitrogen, malodor, bacteria and viruses are main pollution characteristics.
At present, a treatment process mainly based on a biological method is adopted for the production wastewater with good biodegradability, but the traditional biological treatment process has a certain limit value (low nitrogen) on the nitrogen content of the inlet water and has no effective treatment measure on the process wastewater containing pathogenic pollution sources, the characteristics of the treatment process and the wastewater generated in the harmless treatment process cannot be effectively adapted, the treated wastewater hardly reaches the national first-level discharge standard, and bacteria and viruses possibly existing in the wastewater during epidemic situation are not effectively treated; and the process has large civil engineering occupation area and long construction period. Therefore, the technical innovation of the wastewater treatment mode is carried out, and the development of a treatment system with high pollutant removal rate and suitability for the harmless treatment of animal carcasses and a treatment method thereof is a problem to be solved by the technicians in the field.
Disclosure of Invention
In view of this, the first technical problem to be solved by the present invention is: the harmless waste water treatment system for the animal carcasses can sterilize and disinfect waste water generated in the harmless treatment process of the animal carcasses, is suitable for the characteristics of the harmless waste water treatment of the animal carcasses, and has high ammonia nitrogen removal rate.
In order to solve the first technical problem, the technical scheme of the invention is as follows: the animal carcass harmless wastewater treatment system comprises a wastewater pretreatment unit, a hydrolytic acidification unit and an MBBR-MBR combined biological treatment unit which are sequentially arranged;
the wastewater pretreatment unit comprises an ozone catalytic oxidation reactor, an activated sludge adsorption reactor and an ammonia nitrogen stripping absorption tower;
the hydrolytic acidification unit comprises a hydrolytic acidification reactor;
the MBBR-MBR combined biological treatment unit comprises an anoxic moving bed biological membrane reactor, an aerobic moving bed biological membrane reactor and an MBR membrane biological reactor, wherein aeration devices are respectively arranged in the aerobic moving bed biological membrane reactor and the MBR membrane biological reactor, and a digestive fluid return pipeline is connected between the MBR membrane biological reactor and the anoxic moving bed biological membrane reactor.
According to the animal carcass harmless wastewater treatment system, the wastewater is pretreated by the wastewater pretreatment unit, so that the wastewater can be sterilized and disinfected, a germ and virus pollution source is removed, and VOCs, partial COD, animal grease and ammonia nitrogen in the wastewater are removed; the hydrolysis acidification unit is used for carrying out hydrolysis acidification on the wastewater, undissolved organic matters in the wastewater are converted into dissolved organic matters, and macromolecular substances which are difficult to biodegrade are converted into micromolecular substances which are easy to degrade, so that conditions are created for subsequent biological treatment; the wastewater is subjected to biological treatment by the MBBR-MBR combined biological treatment unit, so that residual carbon-containing organic matters, nitrogen-containing organic matters and the like in the wastewater can be removed; the animal carcass harmless wastewater treatment system disclosed by the invention is suitable for the characteristic of animal carcass harmless wastewater treatment, has high pollutant removal rate in wastewater, and meets the discharge requirement.
The following are a plurality of optimal designs of the animal carcass harmless wastewater treatment system:
wherein, the anoxic moving bed biomembrane reactor is provided with a stirrer. The biological filler in the anoxic moving bed biological membrane reactor is rotated and overturned and freely moves by stirring of the stirrer, so that the denitrification reaction in the anoxic moving bed biological membrane reactor is enhanced, and the removal rate of organic pollutants in the wastewater is improved.
Wherein the aerobic moving bed biomembrane reactor is provided with one stage, two stages or more than two stages; two or more stages of aerobic moving bed biomembrane reactors are connected in series. The aerobic moving bed biomembrane reactor adopts a two-stage or more than two-stage series connection mode, can strengthen the oxidative decomposition of the aerobic organisms on organic pollutants, and improves the removal rate of the pollutants.
Wherein, each stage of aerobic moving bed biomembrane reactor is internally provided with a plurality of groups of aeration devices which are independently controlled. Each aeration device is independently controlled, so that different water flow states can be conveniently adjusted according to actual needs.
The MBBR-MBR combined biological treatment unit comprises a shell, wherein a plurality of partition plates are arranged in the shell, the partition plates divide the shell into a plurality of pond bodies, a water inlet chamber is arranged in each pond body, a water inlet chamber water inlet is arranged at the upper part of the water inlet chamber, a water inlet chamber water outlet is arranged at the bottom of the water inlet chamber, and the water outlet of the pond body positioned at the upstream is communicated with the water inlet chamber water inlet of the pond body positioned at the downstream; the anoxic moving bed biological membrane reactor, the aerobic moving bed biological membrane reactor and the MBR membrane biological reactor are respectively and correspondingly arranged in one of the tanks. The MBBR-MBR combined biological treatment unit is integrated in a shell, so that the modular installation and positioning are convenient, and the construction period is short.
Wherein, the wastewater pretreatment unit, the hydrolytic acidification unit and the MBBR-MBR combined biological treatment unit are all arranged on the ground. The whole set of treatment system adopts an overground arrangement mode, so that each component unit is convenient to transport, modularly install and position. The civil engineering process is omitted, the occupied area is small, and the construction period is short.
Based on a general inventive concept, the second technical problem to be solved by the invention is as follows: provides a wastewater treatment method adopting the animal carcass harmless wastewater treatment system.
In order to solve the second technical problem, the technical scheme of the invention is as follows: the waste water treatment method of the animal carcass harmless waste water treatment system comprises a pretreatment step, a hydrolytic acidification step and a biological treatment step;
wherein the preprocessing step comprises the following steps:
s1, performing ozone catalytic oxidation, namely enabling wastewater to be treated to enter an ozone catalytic oxidation reactor, sterilizing, and removing VOCs, partial COD and animal fat in the wastewater through ozone catalytic oxidation;
s2, activated sludge is adsorbed, the wastewater treated in the step S1 is mixed with the activated sludge and then enters an activated sludge adsorption reactor from the bottom, and organic matters and odor in the wastewater are removed again through activated sludge adsorption;
s3, ammonia nitrogen stripping and absorption, namely, enabling the wastewater treated by the S2 to enter an ammonia nitrogen stripping and absorption tower, adding a sodium hydroxide solution into the wastewater to be stripped, adjusting the pH value of the mixed solution to 11.5-12, circularly stripping, removing ammonia nitrogen, adding sulfuric acid into the stripped wastewater, and adjusting the pH value of the mixed solution to 7-8; most ammonia nitrogen in the water is removed through cyclic stripping, so that the ammonia nitrogen concentration of the wastewater is reduced, and the poisoning or inhibiting effect of high-concentration ammonia nitrogen in the wastewater on microorganisms is avoided;
wherein the hydrolytic acidification step comprises:
s4, hydrolysis acidification, wherein the pretreated wastewater enters a hydrolysis acidification reactor, and insoluble organic matters in the wastewater are intercepted and gradually converted into soluble organic matters in the hydrolysis acidification reactor, and some macromolecular substances which are difficult to biodegrade are converted into micromolecular substances which are easy to degrade;
wherein the biological treatment step comprises:
s5, performing anoxic biological treatment, namely enabling the hydrolyzed and acidified wastewater to enter an MBBR-MBR combined biological treatment unit, mixing the wastewater with digestion liquid returned by an MBR membrane bioreactor in a water inlet chamber of an anoxic moving bed biological membrane reactor, and performing denitrification reaction of nitrate nitrogen under the anoxic condition and the action of denitrifying bacteria in the anoxic moving bed biological membrane reactor to remove part of carbon-containing organic matters and a large amount of nitrogen-containing organic matters in the wastewater;
s6, aerobic biological treatment, namely, introducing the wastewater treated by the anoxic moving bed biological membrane reactor into the aerobic moving bed biological membrane reactor, aerating by an aeration device, contacting with biological filler flowing along with aeration, and removing a large amount of carbon-containing organic matters and partial nitrogen-containing organic matters in the wastewater under the action of microorganisms;
s7, performing MBR membrane biological treatment, namely enabling the wastewater treated by the aerobic moving bed biological membrane reactor to enter the MBR membrane biological reactor, performing nitration reaction with nitrifying bacteria in the MBR membrane biological reactor, and deeply removing nitrogen and phosphorus; the middle-layer fluidization liquid of the MBR membrane bioreactor flows back to the anoxic moving bed biological membrane reactor; filtering with MBR membrane to remove suspended substances and obtain clear water.
Further, the wastewater treatment method further comprises:
s8, a sludge treatment step, namely, enabling the residual sludge in the MBR membrane bioreactor to enter a sludge concentration tank, standing for precipitation, and enabling the supernatant after precipitation to enter a hydrolysis acidification reactor; the precipitated sludge enters a sludge homogenizing tank, a flocculating agent is added into the sludge homogenizing tank, and the flocculated sludge enters a plate-and-frame filter press to prepare a mud cake.
Due to the adoption of the technical scheme, when the waste water generated in the innocent treatment process of animal carcasses is treated, ozone is utilized to sterilize and disinfect the waste water, and VOCs, partial COD and animal fat in the waste water are removed through ozone catalytic oxidation; removing organic matters and odor in the wastewater again through activated sludge adsorption; most ammonia nitrogen in the wastewater is removed through ammonia nitrogen circulating stripping, so that the high-concentration ammonia nitrogen in the wastewater is prevented from generating toxic or inhibiting effect on subsequent microorganisms; through hydrolysis and acidification, the non-dissolved organic matters are converted into dissolved organic matters, and the macromolecular matters which are difficult to biodegrade are converted into micromolecular matters which are easy to degrade, so that the biodegradability and degradation speed of the wastewater are greatly improved, and conditions are created for subsequent biological treatment; removing part of carbon-containing organic matters and a large amount of nitrogen-containing organic matters from the wastewater through anoxic biological treatment; removing a large amount of carbon-containing organic matters and partial nitrogen-containing organic matters in the wastewater through aerobic biological treatment, wherein the anoxic biological treatment and the aerobic biological treatment are cooperatively matched to basically remove all carbon-containing organic matters and all nitrogen-containing organic matters; the wastewater is deeply denitrified and dephosphorized by MBR membrane biological treatment, the pollutant is thoroughly removed, and the digestive juice is refluxed to supplement nitrate nitrogen for anoxic biological treatment, so that the guarantee is provided for denitrification reaction; and filtering by an MBR membrane to finally obtain clear water. The wastewater treatment method is used for treating the wastewater generated in the innocent treatment process of animal carcasses, and finally the effluent quality is good and stable, and the effluent bacteria, suspended matters and turbidity are close to zero, so that the wastewater treatment method completely meets the national first-level emission standard requirements.
Drawings
FIG. 1 is a flow chart of a method for treating harmless waste water of animal carcasses in an embodiment of the invention;
FIG. 2 is a schematic diagram of the MBBR-MBR combined biological treatment unit in FIG. 1;
FIG. 3 is a schematic top view of FIG. 2;
in the figure: 1-anoxic moving bed biofilm reactor; 2-a primary aerobic moving bed biomembrane reactor; a 3-second-stage aerobic moving bed biomembrane reactor; a 4-MBR membrane bioreactor; 5-a water inlet chamber; 6-a stirrer; 7-MBR membrane; 81-an aeration device; 82-an aeration device; 83-an aeration device; 84-an aeration device; 85-aeration device; 86-aeration device.
Detailed Description
The following detailed description of specific embodiments of the invention is, but is not limited to, the accompanying drawings.
Referring to fig. 1, the animal carcass harmless wastewater treatment system of the present invention comprises: the device comprises a wastewater pretreatment unit, a hydrolysis acidification unit and an MBBR-MBR combined biological treatment unit which are sequentially arranged.
Wherein the wastewater pretreatment unit comprises: ozone catalytic oxidation reactor, activated sludge adsorption reactor and ammonia nitrogen stripping absorption tower.
Wherein the hydrolytic acidification unit comprises a hydrolytic acidification reactor.
Referring to fig. 2 and 3, wherein the MBBR-MBR combined biological treatment unit comprises: an anoxic moving bed biological membrane reactor 1, an aerobic moving bed biological membrane reactor and an MBR membrane biological reactor 4. In order to strengthen the oxidative decomposition of the aerobic organisms to the organic pollutants and improve the removal rate of the pollutants, the aerobic moving bed biomembrane reactor adopts a two-stage series connection mode, namely: a primary aerobic moving bed biological membrane reactor 2 and a secondary aerobic moving bed biological membrane reactor 3; of course, the aerobic moving bed biofilm reactor is not limited to two stages connected in series, and only one stage or more than two stages can be arranged according to actual treatment requirements. A digestive juice reflux pipeline is connected between the MBR membrane bioreactor 4 and the anoxic moving bed biofilm reactor 1. The first-stage aerobic moving bed biological membrane reactor 2, the second-stage aerobic moving bed biological membrane reactor 3 and the MBR membrane biological reactor 4 are respectively provided with an aeration device, and a Roots blower can be used for conveying compressed air to forcedly transfer oxygen in the air into wastewater, so that not only is enough dissolved oxygen ensured to be obtained, but also the rotary overturning and free movement of biological fillers are enhanced, sinking is prevented, the contact of organic matters in a pool with microorganisms and the dissolved oxygen is enhanced, and the oxidative decomposition of the organic matters in the wastewater is ensured under the condition of sufficient dissolved oxygen of the microorganisms in the pool.
In order to strengthen the aeration effect and facilitate the adjustment of different water flow states, a plurality of groups of independently controlled aeration devices are respectively arranged in each stage of aerobic moving bed biomembrane reactor. Referring to FIG. 3, there are illustrated five groups of aeration devices 81, 82, 83, 84, and 85 in the primary aerobic moving bed biofilm reactor 2; of course, the aeration devices in the aerobic moving bed biofilm reactor are not limited to five groups, and can be increased or decreased according to actual treatment requirements. In fig. 3, a situation is schematically shown in which a set of aeration devices 86 are provided in the MBR membrane bioreactor 4, and of course, aeration devices may be added according to actual treatment requirements.
Referring to fig. 2, wherein an anoxic moving bed biofilm reactor 1 is provided with a stirrer 6. The stirrer 6 is preferably a hyperboloid stirrer. The biological filler in the anoxic moving bed biological membrane reactor 1 is rotated and turned over by stirring of the stirrer 6, so that the denitrification reaction in the anoxic moving bed biological membrane reactor 1 can be enhanced, and the removal rate of organic pollutants in wastewater can be improved.
Referring to fig. 2 and 3, the MBBR-MBR combined biological treatment unit is provided with a shell, a plurality of partition boards are arranged in the shell, the shell is divided into a plurality of tanks by the plurality of partition boards, three partition boards and four tanks are schematically shown in the figure, a water inlet chamber 5 is arranged in each tank, a water inlet chamber water inlet is arranged at the upper part of the water inlet chamber 5, a water inlet chamber water outlet is arranged at the bottom of the water inlet chamber, and the water outlet of the tank positioned at the upstream is communicated with the water inlet chamber water inlet of the tank positioned at the downstream; the anoxic moving bed biological membrane reactor 1, the primary aerobic moving bed biological membrane reactor 2, the secondary aerobic moving bed biological membrane reactor 3 and the MBR membrane biological reactor 4 are respectively and correspondingly arranged in one of the tanks. The MBBR-MBR combined biological treatment unit is integrated in a shell, so that the modular installation and positioning are facilitated, and the construction period is shortened. Compared with the traditional surface water inlet mode, each tank body adopts the bottom water inlet mode, so that sewage is mixed more fully and uniformly.
Wherein, the waste water pretreatment unit, the hydrolytic acidification unit and the MBBR-MBR combined biological treatment unit in the animal carcass harmless waste water treatment system are all arranged on the ground. The whole set of animal carcass harmless wastewater treatment system adopts an overground arrangement mode, so that each constituent unit is convenient to transport, modularly install and position. The civil engineering process is omitted, the occupied area is small, and the construction period is short.
Referring to fig. 1, the animal carcass harmless wastewater treatment system of the present invention is further provided with a sludge treatment unit comprising: a sludge concentration tank, a sludge homogenizing tank, a plate-and-frame filter press and the like, and the sludge concentration tank is connected with the MBR membrane bioreactor 4 through a pipeline.
Referring to fig. 1, the method for treating wastewater by using the animal carcass harmless wastewater treatment system of the present invention includes a pretreatment step, a hydrolytic acidification step and a biological treatment step.
Wherein the pretreatment step comprises the following steps:
s1, ozone catalytic oxidation, namely, extracting wastewater to be treated into an ozone catalytic oxidation reactor, removing VOCs, partial COD, animal fat and the like in the wastewater through ozone catalytic oxidation, sterilizing and disinfecting the wastewater, and utilizing ozone to fracture the animal fat and the annular molecules or long-chain molecules of the organic matters difficult to biodegrade in the wastewater so as to change macromolecular substances into micromolecular substances, further change the structure of the organic matters difficult to biodegrade, convert the substances into substances easy to biodegrade, and improve the biodegradability of the wastewater.
S2, activated sludge is absorbed, the wastewater treated in the step S1 is mixed with the activated sludge and then enters an activated sludge absorption reactor from the bottom, the mixed wastewater is stirred through aeration in the activated sludge absorption reactor, meanwhile, sufficient dissolved oxygen is provided for the activated sludge, the sludge activity is ensured, the sludge absorption efficiency is improved, and organic matters and odor in the wastewater are removed again through the activated sludge absorption.
S3, ammonia nitrogen stripping and absorption, pumping the sediment supernatant fluid treated by the S2 into an adjusting box of an ammonia nitrogen stripping and absorption tower, adding sodium hydroxide solution into the wastewater to be stripped, adjusting the pH value of the mixed solution to 11.5-12, circularly stripping, removing ammonia nitrogen, absorbing and purifying the ammonia gas stripped by the absorption liquid of the absorption tower, and discharging without secondary pollution; sulfuric acid is added into the blown-off wastewater, and the pH value of the mixed solution is regulated to 7-8. Most ammonia nitrogen in the wastewater is removed by ammonia nitrogen stripping, the ammonia nitrogen concentration of the wastewater is reduced, and the poisoning or inhibiting effect of high-concentration ammonia nitrogen in the wastewater on subsequent microorganisms is avoided.
Wherein the hydrolysis acidification step comprises:
s4, hydrolyzing and acidifying, namely, the pretreated wastewater enters a hydrolysis and acidification reactor, and under the action of a large amount of hydrolytic bacteria and acidizing bacteria, insoluble organic matters in the wastewater are intercepted and gradually converted into soluble organic matters, and some macromolecular substances which are difficult to biodegrade are converted into small molecular substances which are easy to degrade, such as organic acid and the like, so that the biodegradability of the wastewater is improved, the degradation speed is greatly improved, and a good foundation is laid for subsequent biological treatment.
The hydrolyzed and acidified wastewater enters an MBBR-MBR combined biological treatment unit, and sequentially enters an anoxic moving bed biological membrane reactor 1, a primary aerobic moving bed biological membrane reactor 2, a secondary aerobic moving bed biological membrane reactor 3 and an MBR membrane biological reactor 4 for biological treatment. Wherein the biological treatment step comprises:
s5, performing anoxic biological treatment, namely enabling the hydrolyzed and acidified wastewater to enter an anoxic moving bed biomembrane reactor 1, mixing the wastewater with digestion liquid returned by an MBR membrane bioreactor 4 in a water inlet chamber 5 of the anoxic moving bed biomembrane reactor 1, performing denitrification reaction of nitrate nitrogen under the anoxic condition and the action of denitrifying bacteria in the anoxic moving bed biomembrane reactor, removing part of carbon-containing organic matters and a large amount of nitrogen-containing organic matters in the wastewater, and continuously stirring by a stirrer 6 to strengthen the denitrification reaction.
S6, aerobic biological treatment, namely sequentially entering the wastewater treated by the anoxic moving bed biological membrane reactor into the first-stage aerobic moving bed biological membrane reactor 2 and the second-stage aerobic moving bed biological membrane reactor 3, aerating by an aeration device, contacting with biological filler flowing along with aeration, and removing a large amount of carbon-containing organic matters and partial nitrogen-containing organic matters in the wastewater under the action of microorganisms. The density of the biological filler is close to that of water, the biological filler is easy to move freely along with the water under slight stirring, and the biological filler has larger specific surface area and is suitable for microorganism adsorption growth. During aeration, biological filler in the two-stage aerobic moving bed biofilm reactor continuously rolls and flows in sewage along with aeration, the biological filler and water are in a complete mixing state, the environment in which microorganisms grow is in gas, liquid and solid phases, small molecular organic matters in the sewage fully contact with biological membranes attached to the biological filler, and organic pollutants in the sewage are continuously oxidized and decomposed by the biological filler deposited microorganisms, so that the organic pollutants in the sewage are removed. As the biological filler of the microbial carrier, collision and shearing continuously occur in water, so that air bubbles are finer, and the utilization rate of oxygen is increased. Different microorganism types are arranged inside and outside each carrier, anaerobic bacteria or facultative bacteria grow inside, and bacteria are well cultured outside, so that each carrier is a micro-reactor, and the nitrification reaction and the denitrification reaction exist simultaneously, thereby improving the wastewater treatment effect.
The biological filler carrier can be made of composite polyethylene material with density of 0.96-0.98g/cm 3 The specific surface area is 220 square meters per meter 3 Because the filler and the water flow can be mixed in the whole volume of the biological tank, the possibility of blocking the biological tank is radically eliminated, and the tank capacity is completely utilized.
S7, performing MBR membrane biological treatment, namely enabling the wastewater treated by the two-stage aerobic moving bed biological membrane reactor to enter an MBR membrane biological reactor 4, performing nitration reaction with nitrifying bacteria in the MBR membrane biological reactor 4, and removing organic matters and nitrogen substances in the wastewater again; the middle-layer fluidization liquid of the MBR membrane bioreactor 4 flows back to the anoxic moving bed biofilm reactor 1, and the digestion liquid flows back to supplement nitrate nitrogen for anoxic biological treatment, so that a guarantee is provided for denitrification reaction; the MBR membrane 7 is used for filtering to remove suspended matters, and the effluent enters a clean water tank and can be directly reused as cooling water, greening water and the like.
In the MBR membrane bioreactor 4, the MBR membrane flushing aeration and the activated sludge oxygen supply aeration are respectively supplied, and the two sets of aeration devices are respectively regulated, so that the stability of the dissolved oxygen in the MBR membrane bioreactor 4 is fully ensured. In the MBR membrane bioreactor 4, the effluent is filtered through the MBR membrane 7, so that the activated sludge is not lost along with the effluent, the separation of hydraulic retention time and sludge retention time is realized, the ultra-high concentration activated sludge is formed in the tank, and pollutants are thoroughly decomposed.
The actual production shows that: by adopting the method to treat the wastewater generated by the innocuous animal carcasses, the removal rate of organic pollutants is up to 98 percent, the effluent quality is good and stable, and the effluent bacteria, suspended matters and turbidity are close to zero. Meanwhile, the residual sludge generated by the MBR membrane bioreactor 4 is very small, which is only 30-40% of that of the traditional activated sludge method, and the sludge treatment requirement is very low. Referring to fig. 1, the wastewater treatment method of the present invention further includes, with respect to the excess sludge:
s8, a sludge treatment step, namely, enabling the residual sludge in the MBR membrane bioreactor 4 to enter a sludge concentration tank, standing for precipitation, and enabling the supernatant after precipitation to enter a hydrolysis acidification reactor; the precipitated sludge enters a sludge homogenizing tank, flocculating agents such as PAM are added into the sludge homogenizing tank, the flocculated sludge enters a plate-and-frame filter press, and the sludge cake can be transported to the outside for treatment after being obtained by filter pressing.
Claims (7)
1. The waste water treatment method of the animal carcass harmless waste water treatment system is characterized in that the waste water treatment system comprises a waste water pretreatment unit, a hydrolysis acidification unit and an MBBR-MBR combined biological treatment unit which are sequentially arranged;
the wastewater pretreatment unit comprises an ozone catalytic oxidation reactor, an activated sludge adsorption reactor and an ammonia nitrogen stripping absorption tower;
the hydrolytic acidification unit comprises a hydrolytic acidification reactor;
the MBBR-MBR combined biological treatment unit comprises an anoxic moving bed biological membrane reactor, an aerobic moving bed biological membrane reactor and an MBR membrane biological reactor, wherein aeration devices are respectively arranged in the aerobic moving bed biological membrane reactor and the MBR membrane biological reactor, and a digestive fluid return pipeline is connected between the MBR membrane biological reactor and the anoxic moving bed biological membrane reactor;
the wastewater treatment method comprises a pretreatment step, a hydrolytic acidification step and a biological treatment step;
the pretreatment step comprises the following steps:
s1, performing ozone catalytic oxidation, namely enabling wastewater to be treated to enter an ozone catalytic oxidation reactor, sterilizing, and removing VOCs, partial COD and animal fat in the wastewater through ozone catalytic oxidation;
s2, activated sludge is adsorbed, the wastewater treated in the step S1 is mixed with the activated sludge and then enters an activated sludge adsorption reactor from the bottom, and organic matters and odor in the wastewater are removed again through activated sludge adsorption;
s3, ammonia nitrogen stripping and absorption, namely, enabling the wastewater treated by the S2 to enter an ammonia nitrogen stripping and absorption tower, adding a sodium hydroxide solution into the wastewater to be stripped, adjusting the pH value of the mixed solution to 11.5-12, circularly stripping, removing ammonia nitrogen, adding sulfuric acid into the stripped wastewater, and adjusting the pH value of the mixed solution to 7-8;
the hydrolytic acidification step comprises:
s4, hydrolysis acidification, wherein the pretreated wastewater enters a hydrolysis acidification reactor, and insoluble organic matters in the wastewater are intercepted and converted into soluble organic matters in the hydrolysis acidification reactor, so that macromolecular substances which are difficult to biodegrade are converted into micromolecular substances which are easy to degrade;
the biological treatment step comprises:
s5, performing anoxic biological treatment, namely enabling the hydrolyzed and acidified wastewater to enter an MBBR-MBR combined biological treatment unit, mixing the wastewater with digestion liquid returned by an MBR membrane bioreactor in a water inlet chamber of an anoxic moving bed biological membrane reactor, and performing denitrification reaction of nitrate nitrogen under the anoxic condition and the action of denitrifying bacteria in the anoxic moving bed biological membrane reactor to remove part of carbon-containing organic matters and a large amount of nitrogen-containing organic matters in the wastewater;
s6, performing aerobic biological treatment, namely enabling the wastewater treated by the anoxic moving bed biomembrane reactor to enter the aerobic moving bed biomembrane reactor, aerating by an aeration device, enabling the wastewater to contact with biological fillers flowing along with aeration, and removing a large amount of carbon-containing organic matters and part of nitrogen-containing organic matters in the wastewater under the action of microorganisms;
s7, performing MBR membrane biological treatment, namely enabling the wastewater treated by the aerobic moving bed biological membrane reactor to enter the MBR membrane biological reactor, performing nitration reaction with nitrifying bacteria in the MBR membrane biological reactor, and deeply removing nitrogen and phosphorus; the middle-layer fluidization liquid of the MBR membrane bioreactor flows back to the anoxic moving bed biological membrane reactor; filtering with MBR membrane to remove suspended substances and obtain clear water.
2. The method for treating waste water of a harmless waste water treatment system for animal carcasses according to claim 1, wherein the anoxic moving bed biofilm reactor is provided with a stirrer.
3. The method for treating waste water of a harmless waste water treatment system for animal carcasses according to claim 1, wherein the aerobic moving bed biofilm reactor is provided with one stage, two stages or more than two stages;
two or more stages of aerobic moving bed biomembrane reactors are connected in series.
4. The method for treating waste water of animal carcass harmless waste water treatment system according to claim 3, wherein a plurality of groups of independently controlled aeration devices are respectively arranged in each stage of aerobic moving bed biomembrane reactor.
5. The method for treating waste water of animal carcass harmless waste water treatment system of claim 4, wherein the MBBR-MBR combined biological treatment unit comprises a housing, wherein a plurality of partition boards are arranged in the housing, the partition boards divide the housing into a plurality of tanks, a water inlet chamber is arranged in each tank, a water inlet chamber water inlet is arranged at the upper part of the water inlet chamber, a water inlet chamber water outlet is arranged at the bottom of the water inlet chamber, and the water outlet of the tank positioned at the upstream is communicated with the water inlet chamber water inlet of the tank positioned at the downstream;
the anoxic moving bed biological membrane reactor, the aerobic moving bed biological membrane reactor and the MBR membrane biological reactor are respectively and correspondingly arranged in one of the tanks.
6. The method for wastewater treatment of animal carcass harmless wastewater treatment system according to any one of claims 1 to 5, wherein the wastewater pretreatment unit, the hydrolytic acidification unit, and the MBBR-MBR combined biological treatment unit are all disposed on the ground.
7. The method for wastewater treatment of an animal carcass innocuous wastewater treatment system according to claim 1, wherein the wastewater treatment method further comprises:
s8, a sludge treatment step, namely, enabling the residual sludge in the MBR membrane bioreactor to enter a sludge concentration tank, standing for precipitation, and enabling the supernatant after precipitation to enter a hydrolysis acidification reactor; the precipitated sludge enters a sludge homogenizing tank, a flocculating agent is added into the sludge homogenizing tank, and the flocculated sludge enters a plate-and-frame filter press to prepare a mud cake.
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| CN108975490B (en) * | 2018-10-08 | 2023-09-08 | 天津城建大学 | Split MBBR-MBR coupling sewage treatment system based on Internet of things |
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| CN109987792A (en) * | 2019-04-16 | 2019-07-09 | 河北绿之梦环保科技有限公司 | A kind of animal carcass harmless treatment generates the processing method and equipment of sewage |
| CN111268865A (en) * | 2020-03-10 | 2020-06-12 | 山东瑞赛克环保有限公司 | Process for treating harmless sewage of animals |
| CN112499894A (en) * | 2020-11-09 | 2021-03-16 | 产学研(广州)环境服务有限公司 | Integrated MBBR (moving bed biofilm reactor) process for treating high-organic high-ammonia nitrogen industrial wastewater |
| CN112830634A (en) * | 2021-01-19 | 2021-05-25 | 南京中洲环保科技有限公司 | High-concentration wastewater COD and N synchronous degradation process in same tank |
| CN114380456A (en) * | 2021-11-24 | 2022-04-22 | 东营市利民无害化处理有限公司 | Technology for treating animal-based sewage died of illness |
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