CN210287088U

CN210287088U - Melamine formaldehyde resin effluent treatment plant

Info

Publication number: CN210287088U
Application number: CN201921225324.XU
Authority: CN
Inventors: 左小伟; 魏俊敏; 赵军辉; 刘佳佳; 程小龙; 刘佳琳
Original assignee: Henan Lance Environmental Protection Technology Co ltd
Current assignee: Henan Lance Environmental Protection Technology Co ltd
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-04-10
Anticipated expiration: 2029-07-31

Abstract

The utility model discloses a melamine formaldehyde resin effluent treatment plant belongs to waste water treatment technical field, its equalizing basin, coagulating sedimentation tank, middle pond, anaerobism pond, blow off the pond, hydrolysis-acidification pool, contact oxidation pond, MBR membrane cisterna and clean water basin that communicate in proper order, coagulating sedimentation tank with sludge thickening tank is discharged into to the mud that the MBR membrane cisterna produced, hydrolysis-acidification pool with contact oxidation pond nitration backward flow, MBR membrane cisterna with hydrolysis-acidification pool mud backward flow, sludge thickening tank and van-type pressure filter intercommunication, the supernatant that the sludge thickening tank produced with the filtration liquid that van-type pressure filter produced all flows back to the equalizing basin. The utility model discloses can carry out effective treatment to formaldehyde, melamine formaldehyde resin and urea-formaldehyde resin in the melamine impregnated paper waste water.

Description

Melamine formaldehyde resin effluent treatment plant

Technical Field

The utility model relates to a waste water treatment technical field specifically is a melamine formaldehyde resin effluent treatment plant.

Background

In the process of manufacturing furniture, the surface decoration of the furniture can be carried out after or before the furniture is assembled, and a plurality of decoration methods are often used in combination. The surface decoration can make the furniture more beautiful, and has color, luster and texture which are coordinated with the shape, so that people can feel beautiful and comfortable. The surface of the furniture is covered with a protective layer with certain water resistance, heat resistance, weather resistance, wear resistance and chemical corrosion resistance, so that the aims of protecting the furniture and prolonging the service life can be fulfilled. The melamine impregnated paper is a common paper for furniture decoration, which is prepared by soaking various special printing papers in melamine resin and drying. It can imitate various patterns, beautify appearance and cover up the surface defects of the base material.

In the production process of the melamine impregnated paper, cleaning wastewater is generated when a glue tank for glue making and glue dipping is regularly cleaned, and the main components of the melamine impregnated paper comprise formaldehyde, melamine formaldehyde resin, urea formaldehyde resin and the like. If the waste water is directly discharged without being treated, the waste water not only causes pollution to the environment, but also has great harm to the human body, and simultaneously destroys the surrounding environment to cause adverse effects. In order to further carry out project environment protection work, the national guidelines and policies on environment protection are seriously implemented, the physical and mental health of production workers and the quality of the surrounding environment are protected, the influence on the surrounding environment is reduced to the maximum extent, the call of environmental protection departments is actively responded, and the wastewater needs to be treated.

The patent with publication number CN 103723860B discloses a method for treating hexamethylol melamine wastewater and a treatment system thereof, and the process flow comprises the following steps: feeding hexamethylol melamine wastewater into a wastewater treatment kettle, and adding melamine and a catalyst into the wastewater treatment kettle; sending the primarily treated wastewater in the wastewater treatment kettle into a multistage sedimentation tank for sedimentation treatment in sequence; sending the supernatant in the final-stage sedimentation tank into a formaldehyde recovery device for recycling formaldehyde; returning the precipitate in each stage of sedimentation tank as a raw material to the wastewater treatment kettle for reaction; or filtering the precipitate in each stage of sedimentation tank by a suction filter to obtain a solid product, and returning the liquid after suction filtration to the final stage of sedimentation tank. According to the treatment method and the treatment system, the hexamethylol melamine wastewater is subjected to operations of reaction and precipitation, cyclic utilization of precipitate, formaldehyde recovery and the like, so that the aim of zero emission of the hexamethylol melamine wastewater is fulfilled, and the whole treatment process is simple, pollution-free and low in energy consumption. However, the invention can not effectively treat melamine formaldehyde resin, urea formaldehyde resin and other organic matters in the melamine impregnated paper production wastewater.

Disclosure of Invention

In view of this, the utility model discloses to prior art not enough, the melamine formaldehyde resin effluent treatment plant who provides can carry out effective processing to formaldehyde, melamine formaldehyde resin and urea-formaldehyde resin in the melamine impregnated paper waste water.

In order to solve the technical problem, the utility model discloses the technical scheme who takes is: the utility model provides a melamine formaldehyde resin effluent treatment plant, is including equalizing basin, coagulating sedimentation tank, middle pond, anaerobism pond, the pond of blowing off, hydrolysis-acidification pond, contact oxidation pond, MBR membrane cisterna and the clean water basin that communicates in proper order, coagulating sedimentation tank with sludge thickening tank is arranged into to the mud that MBR membrane cisterna produced, hydrolysis-acidification pond with contact oxidation pond nitration backward flow, MBR membrane cisterna with hydrolysis-acidification pond mud backward flow, sludge thickening tank and van-type pressure filter intercommunication, the supernatant that sludge thickening tank produced with the filtration liquid that van-type pressure filter produced all flow back to the equalizing basin.

Further, a pH on-line monitor is arranged in the regulating reservoir.

Furthermore, the coagulating sedimentation tank is provided with a coagulant feeding device and a flocculating agent feeding device.

Further, the anaerobic tank is a UASB reactor.

Further, sludge generated by the coagulation sedimentation tank and the MBR membrane tank is concentrated in a sludge concentration tank and then is lifted into the chamber filter press through a screw pump, a dewatered sludge cake is transported out for disposal, and supernatant of the sludge concentration tank and leachate of the chamber filter press flow back to the regulating tank.

Furthermore, a water pump is arranged between the adjusting tank and the coagulating sedimentation tank, and a water pump is arranged between the middle water tank and the anaerobic tank.

Further, an alkali adding device and an acid adding device are arranged on the stripping pool.

Further, the contact oxidation tank and the MBR membrane tank are both communicated with an aeration device.

Compared with the prior art, the beneficial effects of the utility model are as follows:

the utility model discloses melamine formaldehyde resin effluent treatment plant, washing wastewater stay to the equalizing basin through underground piping and carry out the regulation of quality of water, water yield. The effluent of the regulating tank is lifted into a coagulating sedimentation tank, and by adding some coagulant and coagulant aid into the water, the particles which are difficult to precipitate in the water can be mutually polymerized to form colloid, thereby being beneficial to precipitation. The effluent of the coagulating sedimentation tank enters an intermediate water tank and is lifted by a lifting pump to enter an anaerobic tank, the anaerobic tank adopts a UASB reactor, sewage flows into the anaerobic sludge bed from the bottom and is in mixed contact with sludge, microorganisms in the sludge decompose organic matters in the water and convert the organic matters into biogas, a sludge-water mixture rises to enter a three-phase separator, and the biogas passes through a water layer to enter an air chamber and is led out by a guide pipe. And the sludge-water mixed liquor enters a settling zone of the three-phase separator, the sludge is flocculated and settled under the action of gravity, the sludge settled on the inclined wall slides back to the anaerobic reaction zone along the inclined wall, and the effluent separated from the sludge overflows from the upper part of an overflow weir of the settling zone and is discharged out of a sludge bed. The effluent of the anaerobic tank automatically flows into a stripping tank, most of ammonia nitrogen is removed, the effluent enters a hydrolysis acidification tank, hydrolysis acidification bacteria open C-C in organic molecules by H + and-OH ionized by H2O, H + is added at one end, and-OH is added at the other end, so that a long chain can be hydrolyzed into a short chain, a branched chain becomes a straight chain, and a cyclic structure forms a straight chain or a branched chain, thereby improving the biodegradability of sewage. Then the wastewater enters a biological contact oxidation tank, a filler is arranged in the tank, the wastewater is in contact with the filler after blast aeration at the bottom of the oxidation tank, and the wastewater is purified under the dual actions of a biological film on the surface of the filler and activated sludge in the gap between the fillers. The effluent of the contact oxidation tank enters an MBR (membrane bioreactor), a membrane component consisting of membrane elements with the same structure is immersed in an aeration tank, the passing of bacteria can be blocked by the pore diameter of 0.3 mu m of an MBR membrane, so that the bacterial micelle and free bacteria in the aeration tank can be retained in the aeration tank, then the sludge-water separation is completed, a subsequent secondary sedimentation tank is avoided, various suspended particles, bacteria, algae, CODcr and organic matters are effectively removed, the water treated by the MBR is discharged into a clean water tank after being pumped out by a self-priming pump, and the sewage in the clean water tank is discharged into a next-level sewage treatment plant through a pipe network.

Sludge generated by the system is concentrated in a sludge concentration tank, lifted into a chamber filter press through a screw pump for dehydration, and then is transported outside for disposal, and supernatant of the sludge concentration tank and percolate of the chamber filter press flow back to an adjusting tank and then return to a sewage treatment system again.

Drawings

Fig. 1 is a flow chart of the structure of the present invention.

Detailed Description

For a better understanding of the present invention, the contents of the present invention will be further clarified below by referring to examples, but the present invention is not limited to the following examples. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details.

As shown in fig. 1, a melamine formaldehyde resin wastewater treatment device comprises an adjusting tank, a coagulating sedimentation tank, an intermediate water tank, an anaerobic tank, a stripping tank, a hydrolysis acidification tank, a contact oxidation tank, an MBR membrane tank and a clean water tank which are sequentially communicated, wherein sludge generated by the coagulating sedimentation tank and the MBR membrane tank is discharged into a sludge concentration tank, the hydrolysis acidification tank and the contact oxidation tank are nitrified and refluxed, the MBR membrane tank and the hydrolysis acidification tank are refluxed with sludge, the sludge concentration tank is communicated with a chamber type filter press, and supernatant generated by the sludge concentration tank and percolate generated by the chamber type filter press are both refluxed to the adjusting tank.

And a pH on-line monitor is arranged in the regulating reservoir.

The coagulating sedimentation tank is provided with a coagulant feeding device and a flocculant feeding device, wherein the coagulant feeding device and the flocculant feeding device are static pipeline mixers, and PAC and PAM are respectively arranged in the static pipeline mixers.

The anaerobic tank is a UASB reactor.

And sludge generated by the coagulation sedimentation tank and the MBR membrane tank is concentrated in the sludge concentration tank and then is lifted into the chamber filter press through a screw pump, a dewatered sludge cake is transported out for disposal, and supernatant of the sludge concentration tank and leachate of the chamber filter press flow back to the regulating tank.

A water pump is arranged between the adjusting tank and the coagulating sedimentation tank, and a water pump is arranged between the middle water tank and the anaerobic tank.

And an alkali adding device and an acid adding device are arranged on the stripping tank, and both the alkali adding device and the acid adding device are static pipeline mixers, wherein quick lime and hydrochloric acid are respectively arranged.

The contact oxidation tank and the MBR membrane tank are both communicated with an aeration device, and the aeration device is a fan.

The utility model discloses in, the equalizing basin mainly plays the regulating action to water yield and quality of water to and adjust sewage pH value, still can be used as accident drainage. The production wastewater is sensitive to water quality, water quantity and impact load, and the regulation of the water quality and the water quantity is the guarantee of stable operation of subsequent biochemical treatment by arranging the regulation tank with proper size.

Coagulating sedimentation tank, coagulating the colloid and fine suspended matter in waste water into floccule under the action of coagulant, and separating and removing. The application of the coagulating sedimentation method in water treatment is very wide, and the coagulating sedimentation method can not only reduce the sensory indexes of the raw water such as turbidity, chromaticity and the like, but also remove various toxic and harmful pollutants.

The UASB reactor features that the gas-solid-liquid three-phase separator is set at the upper part of the reactor, the sludge suspension layer and sludge bed area are at the lower part, the waste water is introduced to the bottom of the reactor as uniformly as possible, and the sewage flows upwards through the sludge bed containing granular sludge. The anaerobic reaction occurs during the contact of the wastewater with the sludge particles. Biogas (mainly methane and carbon dioxide) produced under anaerobic conditions causes internal circulation, which is beneficial for the formation and maintenance of granular sludge. Some of the gas formed in the sludge blanket adheres to the sludge particles, and the adhering and non-adhering gas rises toward the top of the reactor. The particles rising to the surface hit the bottom of the gas baffle, causing degassing of the sludge flocs adhering to the bubbles. Sludge particles will settle to the surface of the sludge bed due to the release of bubbles. The attached and unattached gases are collected in a plenum at the top of the reactor. The baffles placed below the plenum unit gaps act as gas reflectors and prevent biogas bubbles from entering the settling zone, which would otherwise cause turbulence in the settling zone and impede particle settling. The liquid containing some remaining solids and sludge particles passes through the separator gap into the settling zone.

Since the flow area of the inclined wall settling zone of the separator increases near the water surface, the upward flow velocity decreases near the discharge point. Due to the reduced flow velocity, sludge flocs can flocculate and settle in the settling zone. Sludge flocs accumulated on the phase separator will to some extent exceed the friction it holds on the inclined wall, and will slide back into the reaction zone, which in turn can react with the influent organic matter.

The most important component of a UASB reactor is a three-phase separator, which is disposed at the top of the reactor and divides the reactor into a lower reaction zone and an upper settling zone. In order to achieve a satisfactory sedimentation effect of sludge flocs/particles in the upflow in the sedimentation zone, the first main objective of the three-phase separator is also to separate the biogas generated from the sludge bed/bed as efficiently as possible, especially at high loads. The function of the reflecting plate below the gas collecting chambers is to prevent methane from escaping to the settling chamber through gaps between the gas collecting chambers.

The UASB reactor is adopted, the process has quick starting process when treating high-concentration wastewater, granulated activated sludge is easy to form, and the maximum volume load rate of 20kgCOD/m can be achieved when the process stably runs and the COD removal rate is kept above 80 percent³D, the maximum gas production rate can reach 10.6 m³/m³D; when the project is in normal production operation, the HRT is 1d, and the volume load rate can reach 7.5-12.5 kgCOD/m under the condition of the temperature of 30-32 DEG C³D, COD removal rate of 92.5%, its impact load resistance and low pH value of the ability is also very strong. The UASB has the advantages of high treatment efficiency, good three-phase separation effect and good sludge settling property when used for treating high-concentration wastewater.

The air stripping tank makes a large amount of air contact with the wastewater under an alkaline condition, converts the ionic ammonia nitrogen in the wastewater into free ammonia and blows the free ammonia out, so as to achieve the purpose of removing the ammonia nitrogen in the wastewater. The air stripping method has the advantages of ammonia nitrogen removal rate of over 85 percent, simple process and simple and convenient operation. After the sewage is subjected to anaerobic treatment, a large amount of ammonia gas and other gases are generated, in order to reduce the load of subsequent treatment facilities and ensure that the ammonia nitrogen of a treatment system reaches the standard, a stripping tank is arranged to blow the ammonia nitrogen off by using air, and the effluent of the stripping tank automatically flows into a hydrolysis acidification tank.

Hydrolysis acidification pool, in wastewater treatment, hydrolysis refers to biochemical reactions that take place extracellularly before organic substrates enter the cells. Hydrolysis is the process by which a complex, non-soluble polymer is converted to a simple, soluble monomer or dimer. Hydrolysis chemically refers to the generic term for a type of reaction that a compound undergoes with water. Since the high molecular weight organic substance is relatively large in molecular weight and cannot permeate cell membranes, it is impossible to directly utilize the high molecular weight organic substance for bacteria. And obtains energy through intracellular biochemical reaction, and discharges metabolites (mainly various organic acids under anaerobic condition). If both insoluble and soluble organics are present in the wastewater, hydrolysis and acidification are more inseparably simultaneous. If acidification lowers the pH too much, hydrolysis is not favored. Acidification is a typical fermentation process, i.e., acidogenic fermentation. Acidification is a biodegradation process of organic substrates, i.e. acting as electron acceptor and also electron donor. During the acidification process the soluble organics are converted to end products with predominantly volatile acids. They are first converted into small-molecule substances by hydrolysis by extracellular enzymes of the bacteria. The most typical feature of this stage is that the site of the biological reaction occurs outside the cell, and the microorganism performs the biocatalytic oxidation reaction (mainly involving chain scission and water solubility of macromolecular species) by releasing free extracellular enzymes or immobilized enzymes attached to the outer wall of the cell.

In mixed microbial systems under anaerobic conditions, hydrolysis and acidification cannot be separated clearly even if conditions are strictly controlled, since the hydrolytic bacteria are actually a fermentative bacteria with hydrolytic capacity, hydrolysis being an energy-consuming process, and the energy expended by the fermentative bacteria for hydrolysis in order to obtain a water-soluble substrate capable of fermentation.

The process of producing the biogas by anaerobic fermentation can be divided into four stages, namely a hydrolysis stage, an acidification stage, an acetoxylation stage, a methane stage and the like. The hydrolysis acidification process is a process for controlling anaerobic treatment in a first stage and a second stage with short reaction time, namely hydrolyzing insoluble organic matters into soluble organic matters and converting macromolecular substances which are difficult to biodegrade into micromolecular organic substances which are easy to biodegrade.

Compared with a single aerobic process, the combined use of the hydrolysis acidification process and the aerobic process has the following advantages:

the operation cost of the hydrolysis acidification process is low, and the removal of organic matters in the wastewater can also save the oxygen demand of an aerobic section, so that the operation cost of the whole process is saved; the hydrolysis acidification process can buffer the change of the water inlet load, thereby creating a stable water inlet condition for aerobic treatment; the products in hydrolysis and acid production stages are mainly micromolecular organic matters, and the biodegradability is generally good. Therefore, the hydrolysis tank can change the biodegradability of the original sewage, thereby reducing the reaction time and the energy consumption of treatment. The degradation of solid organic matters can reduce the sludge amount, and the function of the digestion tank is the same as that of the digestion tank. The process only generates little biological activated sludge which is difficult to be anaerobically degraded, so that the sewage and sludge can be treated at one time without a frequently-heated mesophilic digestion tank.

The organic matters in the sewage are greatly changed in quantity and physical and chemical properties by the hydrolysis acidification process, so that the sewage is more suitable for subsequent aerobic treatment, and the aerobic treatment efficiency is improved; the sludge yield of the hydrolysis acidification process is far lower than that of the aerobic process, and the hydrolysis acidification process is highly mineralized and easy to treat.

A contact oxidation pond is a method for treating organic sewage by using microorganisms (namely biological membranes) attached to and growing on the surfaces of certain solid matters. The biological membrane is an ecological system consisting of highly dense aerobic bacteria, anaerobic bacteria, facultative bacteria, fungi, protozoa, algae and the like, and a solid medium attached to the biological membrane is called as a filter material or a carrier. The biological membrane can be divided into a gentleness gas layer, a good gas layer, an attaching water layer and a sport water layer from the filter material to the outside. The principle is that the biomembrane firstly adsorbs water layer organic matters, the organic matters are decomposed by aerobic bacteria of an aerobic layer and then enter an anaerobic layer for anaerobic decomposition, and a flowing water layer washes away the aged biomembrane to grow a new biomembrane, so that the aim of purifying sewage is fulfilled. The aged biological membrane continuously falls off, flows into the MBR membrane tank along with water, and is removed through sludge discharge.

The biological contact oxidation pond is internally provided with a filler which is submerged in the wastewater, the filler is full of a biological membrane, and in the contact process of the wastewater and the biological membrane, organic matters in the water are adsorbed, oxidized, decomposed and converted into a new biological membrane by microorganisms. The biomembrane dropped from the filler flows into the MBR membrane tank along with water, and is removed by sludge discharge, so that the wastewater is purified. In the contact oxidation pond, oxygen is continuously introduced into the pond through a Roots blower and is uniformly supplied to microorganisms through a gas distribution system arranged at the bottom of the pond.

The biological contact oxidation method has no sludge bulking problem, and particularly shows superiority for sewage which is easy to generate bulking by an activated sludge method. The strain (such as coccobacillus or the like) which is easy to swell in the activated sludge process does not swell in the contact oxidation process, and can fully exert the advantage of strong decomposition and oxidation capability. The operation may be intermittent. When power is cut off or other sudden accidents happen, the biological membrane has stronger adaptability to intermittent operation. When the vehicle is parked for a long time, the bacteria adapt to the unfavorable conditions of the environment, and the bacteria and the protozoa can enter a dormant state, so that the vehicle has strong adaptability to the unfavorable growing environment; once the environmental conditions are improved, the microorganism can start to grow and metabolize again. When some experiment shows that the operation is restarted even if the operation is stopped for one month, the biological membrane can be recovered to be normal within a plurality of days. Convenient maintenance and management without returning sludge. Because the microorganism is attached to the filler to form a biological film, the peeling and growth of the biological film can automatically keep balance, so that the sludge does not need to flow back, and the operation is very convenient.

The MBR membrane tank replaces a secondary sedimentation tank in the traditional process, and can efficiently carry out solid-liquid separation. But also can maintain high-concentration microorganism biomass in the biological tank, the process has less excess sludge, extremely effectively removes ammonia nitrogen, the suspended matters and turbidity of the effluent are close to zero, bacteria and viruses in the effluent are greatly removed, the energy consumption is low, and the occupied area is small.

The membrane biological treatment technology is applied to the aspect of wastewater recycling and has the following characteristics:

(1) can effectively separate solid and liquid, and separate suspended substances, colloidal substances, microbial flora lost by biological units and purified water in the wastewater. The separation process is simple, the occupied area is small, the effluent quality is good, and the effluent can be recycled without three-stage treatment.

(2) The biomass in the biological treatment unit can be maintained at high concentration, the volume load is greatly improved, and meanwhile, the high efficiency of membrane separation greatly shortens the hydraulic retention time of the treatment unit and correspondingly reduces the occupied area of the bioreactor.

(3) The loss of various microbial flora can be prevented, which is beneficial to the growth of bacteria (nitrobacteria and the like) with slow growth speed, thereby leading various metabolic processes in the system to be carried out smoothly.

(4) The retention time of some macromolecular organic matters difficult to degrade is prolonged, which is beneficial to the decomposition of the organic matters.

(5) The membrane treatment technology is the same as other filtration and separation technologies, in the long-term operation process, the membrane is blocked as a filter medium, the water passing amount of the membrane gradually decreases along with the operation time, and effective backwashing and chemical cleaning can slow down the decrease of the membrane flux and maintain the effective service life of an MBR system.

And the water treated in the clear water tank and the MBR membrane tank is temporarily stored, one part of the water is used for backwashing of the MBR membrane, and the rest part of the water is discharged after reaching the standard.

The sludge concentration tank is the same as a common sedimentation tank in structure and is commonly used for treating high-turbidity wastewater. The clarification and concentration processes in the tank are carried out simultaneously, and a clear water layer, a sedimentation layer, a filtering layer and a compression layer exist simultaneously. The surface area depends on the clarification and concentration capacity, and the larger of the two is taken as the design area of the sedimentation tank. The solid matter load is generally 3 to 4 kg/(m)²H). For a high-turbidity sewage sedimentation tank, the effective water depth is 3.0-4.0 m, and can also be determined according to the retention time, and for a sewage concentration tank, the retention time is usually 12-24 h. When the amount of sludge is small, a method of intermittent operation and static sedimentation concentration can be considered.

The utility model discloses an equalizing basin, coagulating sedimentation pond, anaerobism pond, blow off the pond, hydrolysis-acidification pond, contact oxidation pond, MBR membrane cisterna handle melamine impregnated paper waste water for formaldehyde, melamine formaldehyde resin and urea-formaldehyde resin wherein are effectively got rid of, accord with emission standard.

The utility model discloses in, the optional high-efficient coagulating sedimentation pond of selectable Weifang Moze Ruita environmental protection science and technology limited company production of coagulating sedimentation pond, the hydrolysis-acidification pond of the selectable all city Kunzui environmental protection science and technology limited company production of hydrolysis-acidification pond, the integration AO biological contact oxidation pond of the selectable Shandong Runtian environmental protection equipment limited company production of contact oxidation pond, the MBR membrane bioreactor of the selectable Jiangsu Dafu membrane science and technology limited company production of MBR membrane pond.

The wastewater is discharged into a municipal pipe network after being treated and enters a certain sewage treatment plant for further treatment. The sewage discharge standard implements the third-level standard in Integrated wastewater discharge Standard (GB 8978-1996), and the specific treatment effects are shown in the following table:

finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent replacements made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims

1. The utility model provides a melamine formaldehyde resin effluent treatment plant which characterized in that: including equalizing basin, coagulating sedimentation tank, middle pond, anaerobism pond, the pond of blowing to take off, hydrolysis-acidification pool, contact oxidation pond, MBR membrane cisterna and the clean water basin that communicates in proper order, coagulating sedimentation tank with sludge thickening tank is arranged into to the mud that the MBR membrane cisterna produced, hydrolysis-acidification pool with contact oxidation pond nitrifies the backward flow, MBR membrane cisterna with hydrolysis-acidification pool mud backward flow, sludge thickening tank and chamber filter press intercommunication, the supernatant that sludge thickening tank produced with the filtration liquid that chamber filter press produced all flows back extremely the equalizing basin.

2. The melamine formaldehyde resin wastewater treatment plant of claim 1, wherein: and a pH on-line monitor is arranged in the regulating reservoir.

3. The melamine formaldehyde resin wastewater treatment plant of claim 1, wherein: the coagulating sedimentation tank is provided with a coagulant feeding device and a flocculating agent feeding device.

4. The melamine formaldehyde resin wastewater treatment plant of claim 1, wherein: the anaerobic tank is a UASB reactor.

5. The melamine formaldehyde resin wastewater treatment plant of claim 1, wherein: and sludge generated by the coagulation sedimentation tank and the MBR membrane tank is concentrated in the sludge concentration tank and then is lifted into the chamber filter press through a screw pump, a dewatered sludge cake is transported out for disposal, and supernatant of the sludge concentration tank and leachate of the chamber filter press flow back to the regulating tank.

6. The melamine formaldehyde resin wastewater treatment plant of claim 1, wherein: a water pump is arranged between the adjusting tank and the coagulating sedimentation tank, and a water pump is arranged between the middle water tank and the anaerobic tank.

7. The melamine formaldehyde resin wastewater treatment plant of claim 1, wherein: and an alkali adding device and an acid adding device are arranged on the stripping tank.

8. The melamine formaldehyde resin wastewater treatment plant of claim 1, wherein: the contact oxidation tank and the MBR membrane tank are both communicated with an aeration device.