CN116514320A - Developer solution wastewater treatment system - Google Patents

Abstract

The invention discloses a developing solution wastewater treatment system. The raw wastewater enters the collection pool for water volume adjustment and pH adjustment, and then undergoes the following processing steps: ST1, and performs secondary catalytic oxidation treatment. The secondary catalytic oxidation treatment is sequentially entering the electric Catalytic reactor and ozone multi-component catalytic reactor; ST2, the first stage of biochemical treatment, the first stage of biochemical treatment is sequentially entering the UASB anaerobic reactor, high-load aerobic tank, and primary sedimentation tank; ST3, the first stage of biochemical treatment The second stage of biochemical treatment, the second stage of biochemical treatment is to enter the anaerobic pool, the anoxic pool, and the aerobic pool for biochemical treatment in sequence, and then enter the secondary sedimentation pool; ST4, enter the discharge pool. The invention first performs secondary catalytic oxidation to improve the biodegradability of waste water, forms a complete treatment system through multi-stage treatment procedures, and optimizes the treatment capacity of developer waste water.

Description

A developer wastewater treatment system

technical field

The invention relates to the technical field of sewage treatment, in particular to a developer wastewater treatment system.

Background technique

Developer waste water is TMAH waste liquid and hydroxyl-containing resin and other organic waste liquid produced by the development and demoulding process, and the COD concentration is about 100,000 mg/L. The developer wastewater contains a large number of various organic substances and metal elements, which is highly polluted, has poor biodegradability, is not easily oxidized by common oxidants, and is difficult to treat. In addition, during the treatment process, the generated sludge and waste gas cannot be ignored, and a comprehensive treatment method is urgently needed.

Contents of the invention

In order to solve the problem of difficult treatment of developer wastewater, the invention provides a developer wastewater treatment system.

The present invention provides following technical scheme:

A developer wastewater treatment system, the wastewater raw water enters the collection tank for water volume adjustment and pH adjustment, and then undergoes the following processing steps:

ST1, performing a secondary catalytic oxidation treatment, the secondary catalytic oxidation treatment is to enter the electrocatalytic reactor and the ozone multi-component catalytic reactor in sequence;

ST2, the first stage of biochemical treatment is carried out, and the first stage of biochemical treatment is sequentially entering the UASB anaerobic reactor, high-load aerobic tank, and primary sedimentation tank;

ST3, carry out the second stage of biochemical treatment, the second stage of biochemical treatment is to enter the anaerobic pond, anoxic pond, and aerobic pond for biochemical treatment in sequence, and then enter the secondary sedimentation pond;

ST4, enter the discharge pool;

The exhaust gas generated in the above treatment process is concentrated and enters the odor treatment unit, and the generated sludge enters the sludge tank.

As preferably, in the ozone multi-component catalytic reactor, utilize Fe ²⁺ as the catalyst of ozone.

Preferably, fillers are arranged in the pool of the high-load aerobic pool, and aeration at the bottom of the pool oxygenates the sewage and keeps the sewage in the pool in a flowing state.

Preferably, the filler: specific gravity: 0.92kg/l, specific surface area: 1000m2/m3, monomer size: Φ100×100mm, microbial retention: 6000-22000mg/l.

As a preference, a sludge return facility is provided, and the sludge return facility: Airlift return equipment is added in the primary sedimentation tank to return part of the excess sludge.

As a preference, the inlet of the first-stage settling tank is provided with a dosing and flocculation section, and the dosing liquid is PAC and PAM.

Preferably, the sludge in the sludge tank enters the box type dehydrator to form a mud cake.

Preferably, the odor treatment unit: waste gas enters the treatment chamber, and several UV plasma photolysis purification modules are inserted into the treatment chamber, and then enters the washing tower for absorption and then discharges at high altitude.

The beneficial effects of the present invention are:

(1) Due to the poor biodegradability of wastewater, the secondary catalytic oxidation is carried out first, so that the refractory organic matter generates organic free radicals to destroy it, oxidizes and decomposes, and causes organic macromolecules to undergo chain scission degradation, thereby eliminating the color of organic matter, especially printing and dyeing wastewater. degree, improving the biodegradability of wastewater.

(2) The waste gas produced in the system is subjected to photolysis treatment, and the sludge is dehydrated to comprehensively treat the three wastes of gas, water and solid.

(3) Comprehensively set up multi-stage treatment procedures to form a complete treatment system and optimize the treatment capacity of developer wastewater.

Description of drawings:

Fig. 1 is a process flow block diagram of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

Example:

The sewage treatment scale of the system is 12m ³ per day, and the indicators when raw water enters: CODcr≤100000, SS≤1000, BOD _5≤2000 , PH>9.

As shown in Figure 1, a developer wastewater treatment system, the wastewater raw water enters the collection tank for water volume adjustment and pH adjustment, and then undergoes the following processing steps:

ST1, performing a secondary catalytic oxidation treatment, the secondary catalytic oxidation treatment is to enter the electrocatalytic reactor and the ozone multi-component catalytic reactor in sequence;

ST2, the first stage of biochemical treatment is carried out, and the first stage of biochemical treatment is sequentially entering the UASB anaerobic reactor, high-load aerobic tank, and primary sedimentation tank;

ST3, carry out the second stage of biochemical treatment, the second stage of biochemical treatment is to enter the anaerobic pond, anoxic pond, and aerobic pond for biochemical treatment in sequence, and then enter the secondary sedimentation pond;

ST4, enter the discharge pool;

The exhaust gas generated in the above treatment process is concentrated and enters the odor treatment unit, and the generated sludge enters the sludge tank. The sludge in the sludge tank enters the box dehydrator to form a mud cake.

The odor treatment unit: the exhaust gas enters the treatment chamber, and several UV plasma photolysis purification modules are inserted into the treatment chamber, and then enter the washing tower for absorption and discharge at high altitude. The main odor substances in this system are trace organic component gases such as H ₂ S, NH ₃ , and methyl mercaptan. High-energy and high-ozone UV ultraviolet light beams irradiate, crack waste gas, and degrade it into low-molecular compounds. Using high-energy UV light beams to crack the molecular bonds of bacteria in malodorous gas, destroying the nucleic acid (DNA) of bacteria, and then carry out oxidation reaction through ozone to completely achieve the purpose of deodorization and killing bacteria.

The collection pool: adjust the water quality homogenization and water volume of the sewage whose water volume and water quality change greatly with time, and adjust the pH at the same time, so as to ensure the continuity and stability of the subsequent treatment facilities. Design effective volume: 10m3, material: concrete lined with FRP anticorrosion. Equipped with two sewage lifting pumps, ultrasonic liquid level gauge, and aeration device.

The electrocatalytic reactor: two reactors are connected in series to form one group, and multiple groups are connected in parallel to form a reactor stack. Including main equipment: power supply 2kw, two sets of reaction modules.

The pollution particles in the sewage are induced by the closed electric field to redistribute the internal charges. The positive charges inside the particles are biased towards the negative pole, and the negative charges are biased towards the positive pole. This process is called the dipolarization of the particles; the dipolarized particles are due to At the same time, it has positive and negative electrons, and has more ionic freedom, which is beneficial to the subsequent flocculation. The dipolarized pollution particles undergo an electrochemical reaction on the surface of the plate; the intermediate product produced by the electrochemical reaction oxidizes or reduces the pollution particles, and after the electric field reaction, the form of the substance is changed or degraded. Dipolarized particles are continuously aggregated into new and larger ions during the flow process; at the same time, with the help of high flocculation ions released by the anode, the particles are continuously bridged and combined, and flocculation nets are captured to form larger ions; with the help of the design of the flow channel , the chances of collision between particles are continuously enhanced. After continuous collision and combination, irreversible aggregation and flocculation are finally realized, and the floc becomes 104 times that of the original particle. Sewage is removed by adsorption and co-precipitation of pollutants in wastewater through electrocatalytic reaction. The removal rate of COD in and out of water in this process section is 30%.

The ozone multi-component catalytic reactor: material: concrete lined with glass fiber reinforced plastic for anticorrosion. It is equipped with water distributor, bracket and corresponding ozone multi-component catalytic packing, aeration device; ozone releaser, ozone generator, ozone tail gas destroyer.

Using Fe ²⁺ as a catalyst for ozone generates OH with strong oxidative electricity and high reactivity. Hydroxyl radicals generate organic free radicals with refractory organics in aqueous solution to destroy their structures and eventually oxidize and decompose. The organic matter is chemically adsorbed on the surface of the catalyst to form a surface chelate with a certain nucleophilicity, and then ozone or hydroxyl radicals undergo an oxidation reaction with it, and the intermediate product formed can be further oxidized on the surface and can be desorbed into the solution was further oxidized. When the ozone multi-component catalytic filler is immersed in the electrolyte solution, due to the 1.2V electrode potential difference between Fe and C, countless micro-battery systems will be formed, forming an electric field in its action space, and the anode reaction will generate a large amount of Fe ^{2 +} into the wastewater, and then oxidized to Fe ³⁺ , forming a flocculant with high adsorption and flocculation activity. The cathodic reaction produces a large amount of new ecological [H] and [O]. Under acidic conditions, these active components can undergo redox reactions with many components in wastewater, causing organic macromolecules to undergo chain scission and degradation, thereby eliminating Reduce the chromaticity of organic matter, especially printing and dyeing wastewater, and improve the biodegradability of wastewater. The removal rate of COD in and out of water in this process section is 30%.

The UASB anaerobic reactor: the name is an upflow anaerobic sludge bed reactor, which is purchased directly, and the removal rate of COD in and out of this process section is 40%.

The high-load aerobic pool: the filler is arranged in the pool of the high-load aerobic pool, and the aeration at the bottom of the pool oxygenates the sewage and keeps the sewage in the pool in a flowing state. The filler is an improved composite filler, which is further processed on the surface of the fiber on which the organisms depend, to increase the surface area and the biofixation point, and more effectively improve the stability of the biofilm. The filler: specific gravity: 0.92kg/l, specific surface area: 1000m2/m3, monomer size: Φ100×100mm, microbial retention: 6000-22000mg/l. The service life can reach 4-6 years. The packing support is one of SUS304 support, carbon steel + anti-corrosion support, and concrete structure support. The filler bracket fixes the filler to be suspended in the pool and cannot float anywhere, which plays a fixed role. After filling with water, the filler is suspended in the water, and the bracket is in an unstressed state. Only when the maintenance pool is emptied, the bracket bears the weight of the filler, and each bracket bears a weight of about 50kg. The aeration device is composed of an aerator, an air distribution pipe, a tee, a cross, an elbow, a regulator, a connector, a cleaning device, etc., and a diaphragm microporous aerator is used.

The contact oxidation method is adopted, and the biological contact oxidation method is a biofilm process between the activated sludge method and the biological filter. It is characterized in that fillers are set in the pool, aeration at the bottom of the pool oxygenates the sewage, and keeps the sewage in the pool in a flowing state, so as to ensure full contact between the sewage and the fillers in the sewage, and avoid the inconsistency between the sewage and the fillers in the biological contact oxidation tank. average defects. The basic principle of purifying wastewater is the same as that of general biofilm method. Biofilm absorbs organic matter in wastewater. Under aerobic conditions, organic matter is oxidized and decomposed by microorganisms, and wastewater is purified. The oxygen required by microorganisms is supplied by blower aeration. After the biofilm grows to a certain thickness, the microorganisms in the filler wall will undergo anaerobic metabolism due to lack of oxygen. The gas produced and the scouring effect of aeration will cause the biofilm to fall off. And promote the growth of new biofilm. At this time, the shed biofilm will flow out of the pool with the effluent. The biofilm in the pool is composed of mycelium, filamentous bacteria, fungi, protozoa and metazoa. In the activated sludge method, filamentous bacteria are often the factors that affect the normal biological purification; in the biological contact oxidation tank, the filamentous bacteria form a three-dimensional structure in the gap between the fillers, which greatly increases the contact surface between the biological phase and the wastewater. At the same time, because filamentous bacteria have strong oxidation ability to most organic matter and have great adaptability to changes in water quality load, they are a powerful factor to improve purification ability. The high-load aerobic reaction and sedimentation tank will reduce the COD concentration from 29400mg to 10290mg/L.

Set up sludge return facilities, said sludge return facilities: add airlift return equipment in the primary sedimentation tank to return part of the remaining sludge. The inlet of the primary settling tank is provided with a dosing and flocculation section, and the dosing liquid is PAC (coagulant) and PAM (flocculant). By returning part of the remaining sludge, the amount of sludge in the system is further increased, and the treatment effect is enhanced. At the same time, in order to ensure that the effluent reaches the standard, a dosing and flocculation section is installed at the entrance of the sedimentation tank to ensure the quality of the effluent when the system is unstable.

High-concentration sewage undergoes the above-mentioned treatment to form secondary sewage, which enters the second stage of biochemical treatment. Sewage and return sludge first enter the anaerobic tank (DO<0.2mg/L) and mix completely. After 1-2 hours of anaerobic decomposition, part of the BOD is removed, and part of the nitrogen-containing compounds are converted into N2 (denitrification) and released. The phosphorus-accumulating microorganisms (phosphorus-accumulating bacteria, etc.) in the return sludge release phosphorus to meet the demand of bacteria for phosphorus. Then the sewage flows into the anoxic pool (DO<=0.5mg/L), and the denitrifying bacteria in the pool use the undecomposed carbon-containing organic matter in the sewage as the carbon source, and reduce the nitrate that flows back into the aerobic pool through the internal circulation to N ₂ while released. Next, the sewage flows into the aerobic pool (DO, 2-4 mg/L), and the NH3-N (ammonia nitrogen) in the water undergoes nitrification. The COD of this section dropped from 10290mg/L to 309mg/l and met the standard discharge.

Anaerobic tank, the anaerobic treatment is controlled in the first and second stages of anaerobic treatment with a short reaction time, that is, the insoluble organic matter is hydrolyzed into dissolved organic matter under the action of a large number of hydrolytic bacteria and acidifying bacteria, and the difficult biodegradable large The process of converting molecular substances into easily biodegradable small molecular substances, thereby improving the biodegradability of wastewater and laying a good foundation for subsequent treatment. The anoxic section is set separately, and it can be used as an anaerobic pool under the condition of low ammonia nitrogen concentration. When the ammonia nitrogen concentration is not up to standard, the anoxic pool is started as the ammonia nitrogen reduction and denitrification section, which is jointly built with the anaerobic pool.

Table 1 Removal rate of each section of sewage

Claims (8)

1. A developing solution waste water treatment system is characterized in that, waste water raw water enters collection tank and carries out water quantity adjustment and pH adjustment, then through following processing steps: ST1, performing a secondary catalytic oxidation treatment, the secondary catalytic oxidation treatment is to enter the electrocatalytic reactor and the ozone multi-component catalytic reactor in sequence; ST2, the first stage of biochemical treatment is carried out, and the first stage of biochemical treatment is sequentially entering the UASB anaerobic reactor, high-load aerobic tank, and primary sedimentation tank; ST3, carry out the second stage of biochemical treatment, the second stage of biochemical treatment is to enter the anaerobic pond, anoxic pond, and aerobic pond for biochemical treatment in sequence, and then enter the secondary sedimentation pond; ST4, enter the discharge pool; The exhaust gas generated in the above treatment process is concentrated and enters the odor treatment unit, and the generated sludge enters the sludge tank. 2. a kind of developing solution wastewater treatment system according to claim 1 is characterized in that, in the ozone multi-element catalytic reactor, utilize Fe ²⁺ as the catalyst of ozone. 3. A kind of developing liquid waste water treatment system according to claim 1, it is characterized in that, in the pond of high-load aerobic pond, filler is set, and aeration at the bottom of the pond carries out oxygenation to sewage, and makes the sewage in the pond body be in flow state . 4. A developer wastewater treatment system according to claim 3, characterized in that the filler: specific gravity: 0.92kg/l, specific surface area: 1000m2/m3, monomer size: Φ100×100mm, microbial retention : 6000~22000mg/l. 5. A kind of developing solution waste water treatment system according to claim 1, is characterized in that, sludge backflow facility is set, and described sludge backflow facility: add airlift backflow equipment in the primary settling tank, return part of residual sewage mud. 6 . The developer solution wastewater treatment system according to claim 5 , wherein the inlet of the first-stage settling tank is provided with a dosing and flocculation section, and the medicines added are PAC and PAM. 7. A developer wastewater treatment system according to claim 1, characterized in that, the sludge in the sludge tank enters the box type dehydrator to form a mud cake. 8. A kind of developing solution wastewater treatment system according to claim 1, characterized in that, the odor treatment unit: exhaust gas enters the treatment chamber, and several UV plasma photolysis purification modules are inserted into the treatment chamber, and then enter the washing tower to absorb After that, discharge at high altitude.