CN108383299A - The preprocess method and pretreatment system of coal chemical industrial waste water - Google Patents

Abstract

The invention discloses a kind of preprocess method of coal chemical industrial waste water, this method includes flocculation sediment processing, hydrogen peroxide catalytic oxidation processing, Inner electrolysis processing, effluent quality COD≤500mg/L after processing, ammonia nitrogen≤200mg/L, suspended matter≤70mg/L.After the processing of the processing method of the present invention, the waste water that can carry out biochemical treatment can be obtained, which can direct emission or recycling after directly carrying out biochemical treatment.The processing system of the present invention, it is stable, it can effectively make coal chemical industrial waste water achieve the purpose that biochemical.The processing method and processing system of the coal chemical industrial waste water of the present invention have positive dissemination and significant application value.

Description

Coal chemical wastewater pretreatment method and pretreatment system

technical field

The invention relates to the technical field of wastewater treatment, in particular to a pretreatment method and a pretreatment system for coal chemical wastewater.

Background technique

The overall situation of my country's energy is "rich in coal, poor in oil, and low in gas". Coal accounts for about 70% of my country's primary energy consumption structure, which is much higher than the global average of about 30%. Therefore, abundant coal resources provide strong conditions for the development of my country's coal chemical industry. Coal chemical industry refers to the process of converting coal into gas, liquid, solid chemical and energy products through chemical processing using coal as raw material. And with the breakthroughs in technologies such as coal-to-oil, coal-to-gas, and coal-to-olefins, my country's coal chemical industry is transforming into a new type of coal chemical industry based on petroleum substitute products.

However, coal chemical enterprises have a large amount of water consumption and wastewater discharge. Coal chemical enterprises will produce wastewater in coal gasification, dry distillation, purification and chemical product synthesis, mainly high-concentration gas washing water. Coal chemical wastewater has high pollutant concentration and complex organic components. In addition to inorganic pollutants such as ammonia, cyanide, and thiocyanate, it also contains phenols, polycyclic aromatic compounds, and heterocyclic compounds containing nitrogen, oxygen, and sulfur. Fatty compounds and other toxic and harmful substances, CODcr is generally around 50000mg/L, ammonia nitrogen is 4000mg/L, it is a typical industrial wastewater containing refractory organic compounds and poor biochemical properties. Therefore, if the wastewater is discharged into rivers, slope protection or infiltrated into the ground without proper treatment, it will cause serious pollution to the ecological environment and bring serious harm to human beings. And with the rapid development of the energy industry in recent years, coal chemical industry wastewater has become one of the important sources of pollution. At the same time, the treatment of coal chemical wastewater is not only related to the healthy development of my country's coal chemical industry, but also a bottleneck for the transformation and upgrading of my country's coal resources to raw materials and fuel diseases.

Due to the low cost of the biochemical method and the large amount of water to be treated, the current wastewater treatment process basically adopts the biochemical wastewater treatment process. However, the composition of coal chemical wastewater is complex and there are many types of organic matter, which makes the treatment difficult and costly, and the organic pollutants contained are difficult to be degraded by microorganisms and have poor biodegradability. Directly entering the biochemical treatment not only increases the compliance of biochemical treatment, but also biochemical The water quality after treatment is difficult to meet the discharge standard. Therefore, improving the biodegradability of coal chemical industry wastewater is the key to effectively improve coal chemical industry wastewater.

At present, the methods for improving the biodegradability of refractory organic wastewater are relatively limited. At present, there are three methods for improving the biochemical property of wastewater, including anaerobic acidification, electrolysis, and Fenton's reagent advanced oxidation method.

Anaerobic acidification is the use of anaerobic microorganisms to crack heterocyclic compounds and polycyclic aromatic hydrocarbons in coal chemical wastewater, so as to open the rings of benzene, naphthalene, anthraquinone and other organic compounds in aromatic hydrocarbons in wastewater, thereby improving Biodegradability of wastewater. The anaerobic acidification method requires acidic conditions, and aims to hydrolyze large-molecular insoluble complex organic matter into small-molecule soluble higher fatty acids under the action of extracellular enzymes. However, this kind of anaerobic digestion method is also a biochemical reaction, and its effect is affected by the toxic substances in the wastewater on the anaerobic microorganisms. Oxygen acidification pretreatment method fails, and its acidic environment will affect the treatment effect of wastewater entering the next biochemical environment.

Electrolysis is the process in which an electric current passes through a substance to cause a chemical change. In wastewater treatment, some substances in wastewater that are difficult to degrade, contain double bonds, strong electron-drawing groups, azo bonds, and benzene rings are easily reduced by electrolysis, thereby completing the biochemical modification of wastewater. Large coal chemical wastewater is difficult to be effective, and its electrode power and electrolysis range cannot meet the water conservancy load.

The Fenton method belongs to the advanced chemical oxidation method, which utilizes the strong oxidation of the hydroxyl group of hydrogen peroxide to destroy the macromolecules and benzene ring molecules of the refractory organic matter in the wastewater, forming non-toxic small molecular organic matter that can be used by microorganisms. At present, the Fenton method has been widely studied and demonstrated in the field of high-concentration organic wastewater treatment. However, the high cost of the process reagents restricts its industrialization, and a large amount of iron sludge is generated during the oxidation process, which is likely to cause secondary pollution.

Therefore, in view of the water quality characteristics of coal chemical wastewater, it is of great engineering significance to explore and develop new pretreatment methods for coal chemical wastewater.

Contents of the invention

In order to solve the deficiencies in the prior art, the present invention provides a pretreatment method for coal chemical industry wastewater. The pretreatment method is easy to operate, low in cost, high in efficiency and good in effect. It can reach the nanotube level standard, and can be directly reused or discharged after advanced treatment, and the sludge generated during the treatment process is less.

In order to achieve the above object, the pretreatment method of coal chemical industry wastewater of the present invention is used to improve the biodegradability of wastewater so as to facilitate subsequent biochemical treatment. The method includes flocculation precipitation treatment, catalytic oxidation treatment, and internal electrolysis treatment;

In the flocculation and precipitation treatment, the flocculant includes the following components in parts by weight: sulfonate, phosphate ester salt, lime, sodium silicate, calcium hypochlorite, sodium carboxymethyl cellulose, bentonite, attapulgite, volcano stone powder;

In the catalytic oxidation treatment, the catalyst is composed of a carrier and an active component loaded on the carrier, the carrier is at least one of diatomaceous earth, zeolite, ceramsite, and molecular sieve, and the active component includes silicon dioxide , at least one of calcium oxide, aluminum oxide, iron oxide, ferrous oxide, and titanium dioxide; the oxidizing agent is hydrogen peroxide.

The pretreatment method of the present invention aims at the characteristics that coal chemical wastewater contains inorganic pollutants such as heavy metals and cyanide, and is rich in high concentrations of ammonia nitrogen, SS, and difficult-to-biodegrade, toxic and harmful organic substances, and performs flocculation and sedimentation treatment on the wastewater to remove the wastewater Medium SS and some ammonia nitrogen, COD, and heavy metals, catalytic oxidation and internal electrolysis treatment of wastewater, using the synergistic effect of the two, can effectively improve the removal rate of ammonia nitrogen, COD, cyanide inorganic substances and heavy metals in wastewater, so as to achieve waste water. The purpose of biochemical properties is to make the wastewater after the above treatment and then biochemical treatment easy to meet the discharge or reuse standards, effectively reducing the pollution to the environment; in the flocculation and sedimentation treatment, the use of composite flocculants can effectively improve the flocculation of SS in wastewater Precipitation ability; in catalytic oxidation treatment, under the action of aeration, the active components in the catalyst can catalyze hydrogen peroxide to produce hydroxyl radicals, which have strong oxidizing properties and can effectively decompose almost all refractory organic pollutants , even organic pollutants can be converted into harmless inorganic substances, and the reaction speed is extremely fast, little or no sludge is produced during the reaction process, no secondary pollution, and the separation of catalyst and waste water is relatively simple; while internal In electrolytic treatment, organic pollutants in wastewater will automatically undergo electrochemical reactions in the presence of conductive media, and decompose pollutants in wastewater through redox, adsorption, flocculation and precipitation, thereby improving the biodegradability of wastewater. The treatment method of the present invention is simple in operation, low in operation cost, and has a good treatment effect on pollutants in waste water, so that waste water can be biochemically achieved; at the same time, the operation sequence of hydrogen peroxide catalytic oxidation treatment and internal electrolytic treatment can be exchanged at will. The replacement of the sequence will not affect the treatment effect of wastewater, so this pretreatment method has positive significance and significant application value.

As a limitation to the above technical solution, the flocculation-sedimentation treatment includes two steps of flocculation-sedimentation, one-step flocculation-settling is used for advanced flocculation-settling of coal chemical industry wastewater to be treated, and the other-step flocculation-settling is used for flocculation of wastewater after internal electrolytic treatment Precipitation; the dosage of the flocculant is 0.05-0.1% of the waste water.

As a limitation to the above technical solution, the catalytic oxidation treatment is placed before the internal electrolytic treatment or the catalytic oxidation treatment is placed after the flocculation sedimentation treatment connected to the internal electrolytic treatment; the catalytic oxidation treatment includes multiple A group of catalytic oxidation steps, and each group of catalytic oxidation steps is reacted for 0.5-2h under the condition of catalyst, hydrogen peroxide and aeration.

According to the different water quality of coal chemical industry wastewater, the sequence of hydrogen peroxide catalytic treatment and internal electrolytic treatment can be arranged to achieve better treatment effect.

As a limitation to the above technical solution, in the internal electrolysis treatment, aeration treatment is carried out in the presence of iron-carbon fillers.

As a limitation to the above technical solution, after the pretreatment method, the effluent quality COD≤500mg/L, ammonia nitrogen≤200mg/L, and suspended solids≤70mg/L.

Through the treatment of the present invention, the efficient treatment of coal chemical industry wastewater is realized, which has significant progress.

Simultaneously, the present invention also provides a kind of pretreatment system of coal chemical industry waste water as above:

The pretreatment system includes a first flocculation-settling tank connected in sequence, a number of catalytic oxidation towers connected in series, an internal electrolysis reaction tower, and a second flocculation-settling tank; There is a dosing port, and a sewage outlet is provided at the bottom, and the dosing port is connected to the dosing box through a pipeline; the bottom of the catalytic oxidation tower is provided with a microporous aerator, and the microporous aerator passes through a pipeline Connected with the blower arranged outside the catalytic oxidation tower;

The side wall of the first flocculation tank is provided with a waste water inlet connected to the waste water to be treated, and the side wall of the second flocculation tank is provided with a liquid outlet.

The present invention also provides another pretreatment system for coal chemical wastewater as described above:

The pretreatment system includes a first flocculation tank connected in sequence, an internal electrolysis reaction tower, a second flocculation sedimentation tank, and several catalytic oxidation towers connected in series; There is a dosing port, and the bottom is equipped with a sewage outlet. The dosing port is leveled through the pipeline and the dosing box; the bottom of the catalytic oxidation tower is equipped with a microporous aerator, and the microporous aerator passes through the pipeline. Connected with the blower arranged outside the catalytic oxidation tower;

The side wall of the first flocculation-sedimentation tank is provided with a waste water inlet connected to the waste water to be treated, and a number of the catalytic oxidation towers connected in series are provided with a liquid outlet.

In order to cooperate with the application of the above wastewater pretreatment method and effectively ensure the purification effect of wastewater, the present invention also provides two sets of simple and easy-to-control treatment systems to facilitate the treatment of coal chemical wastewater and the stable operation of the treatment system.

As a limitation to the above technical solution, an aerator is provided at the inner bottom of the inner electrolytic reaction tower, and the aerator is connected to a fan arranged outside the inner electrolytic reaction tower through a pipeline.

As a limitation to the above technical solution, the number of the catalytic oxidation towers is three or four.

The number of catalytic oxidation towers can be increased or decreased according to the water quality to achieve the highest cost performance.

As a limitation to the above technical solution, both the catalytic oxidation tower and the internal electrolysis reaction tower are connected with a COD on-line monitor and an ammonia nitrogen on-line monitor.

The COD online monitor and the ammonia nitrogen online monitor can monitor the COD and ammonia nitrogen indicators of the wastewater in the catalytic oxidation tower and the internal electrolytic reaction tower in real time, so as to understand the reaction process in the catalytic oxidation tower and the internal electrolytic reaction tower in real time; The COD and ammonia nitrogen indicators obtained by monitoring different reaction times of wastewater in the catalytic oxidation tower can provide an indication for the replacement of the catalyst in the catalytic oxidation tower.

In summary, adopting the technical solution of the present invention, the obtained wastewater treatment method solves the problem of coal chemical wastewater containing inorganic pollutants such as heavy metals and cyanide, and is rich in high concentrations of ammonia nitrogen, SS, and refractory, toxic and harmful organic substances. However, it is difficult to deal with the problem; after being treated by the pretreatment method, waste water capable of biochemical treatment can be obtained, and the waste water can be directly discharged or recycled for reuse after being directly subjected to biochemical treatment. The pretreatment system of the invention has stable operation and can effectively make the coal chemical industry wastewater biochemical. Therefore, the pretreatment method and pretreatment system of coal chemical industry wastewater of the present invention have positive popularization significance and remarkable application value.

Description of drawings

Fig. 1 is the connection schematic diagram of coal chemical industry wastewater pretreatment system in the embodiment of the present invention;

Fig. 2 is a schematic connection diagram of the coal chemical industry wastewater pretreatment system in another embodiment of the present invention.

In the figure: 1-the first flocculation-sedimentation tank; 2-catalytic oxidation tower; 3-internal electrolysis reaction tower; 4-the second flocculation-settling tank.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Embodiment one

This embodiment relates to the treatment of coal chemical wastewater.

The coal chemical industry wastewater is treated in the following pretreatment system:

Along the waste water flow direction, the treatment system includes a first flocculation sedimentation tank connected in sequence, a number of catalytic oxidation towers connected in series, an internal electrolysis reaction tower and a second flocculation sedimentation tank. The top of each is equipped with a dosing port, and the dosing port is connected to the dosing box through a pipeline, and is used to add flocculant to the first flocculation-settling tank and the second flocculation-settling tank; between the first flocculation-settling tank and the second The bottom of the flocculation sedimentation tank is equipped with a sewage outlet for discharging the sediment at the bottom of the tank. A microporous aerator is provided at the inner bottom of the catalytic oxidation tower, and the microporous aerator is connected with a blower arranged outside the catalytic oxidation tower through a pipeline.

The side wall of the first flocculation tank is provided with a waste water inlet connected to the waste water to be treated, and the side wall of the second flocculation tank is provided with a liquid outlet.

In order to improve the treatment effect of pollutants in the inner electrolytic reaction tower, an aerator is arranged at the inner bottom of the inner electrolytic reaction tower, and the aerator is connected with a fan arranged outside the inner electrolytic reaction tower through a pipeline. The number of catalytic oxidation towers is three or four, and the specific number of catalytic oxidation towers used in the actual reaction is determined by the water quality to be treated. In addition, both the catalytic oxidation tower and the internal electrolytic reaction tower are connected with COD online monitors and ammonia nitrogen online monitors, which are used to monitor the COD and ammonia nitrogen indicators of the wastewater in the catalytic oxidation tower and the internal electrolytic reaction tower in real time. The reaction process in the oxidation tower and the internal electrolysis reaction tower; and the COD online monitor and ammonia nitrogen online monitor installed in the catalytic oxidation tower can also indicate the replacement of the catalyst in the catalytic oxidation tower according to the trend of the monitored indicators with the reaction time .

In the above-mentioned pretreatment system, as shown in the process flow diagram of Figure 1, the treatment of waste water is carried out as follows:

a. Flocculation and precipitation: add flocculants to the wastewater to be treated, the flocculants include sulfonate, phosphate ester salt, lime, sodium silicate, calcium hypochlorite, carboxymethyl cellulose sodium salt, bentonite, attapulgite Soil, volcanic stone powder, flocculant dosage is 0.1-0.05% of the waste water, mixed evenly and then statically settled to obtain the supernatant.

b. Catalytic oxidation of hydrogen peroxide: The supernatant is subjected to multiple sets of catalytic oxidation steps in series, and a catalyst is added to the supernatant in each set of catalytic oxidation steps. The catalyst is composed of a carrier and an active component loaded on the carrier. The carrier It is at least one of diatomite, zeolite, ceramsite, and molecular sieve, and the active component includes at least one of silicon dioxide, calcium oxide, aluminum oxide, iron oxide, ferrous oxide, and titanium dioxide; then add hydrogen peroxide, mix After uniformity, react for 0.5-2h under aeration conditions.

c. Internal electrolysis: adjust the pH and temperature of the wastewater obtained after the treatment in step b, then add iron-carbon fillers to the wastewater, and perform aeration operation at the bottom of the wastewater.

d, flocculation precipitation: add flocculant to the waste water after step c treatment, described flocculant comprises sulfonate, phosphate ester salt, lime, sodium silicate, calcium hypochlorite, carboxymethyl cellulose sodium salt, Bentonite, attapulgite, volcanic rock powder, flocculant dosage is 0.1-0.05% of the waste water, mixed uniformly and then statically settled to obtain a biodegradable waste water solution.

After treatment, the effluent water quality COD≤500mg/L, ammonia nitrogen≤200mg/L, and suspended solids≤70mg/L, so that the effluent can meet the third-level discharge standard of the "Integrated Wastewater Discharge Standard", that is, the tube standard, so as to facilitate the subsequent biochemical treatment of the wastewater Discharge or reuse after treatment.

Embodiment two

This embodiment relates to the treatment of coal chemical wastewater.

The coal chemical industry wastewater is treated in the following pretreatment system:

Along the waste water flow direction, the treatment system includes a first flocculation sedimentation tank, an internal electrolytic reaction tower, a second flocculation sedimentation tank, and several catalytic oxidation towers connected in series. The top of each is equipped with a dosing port, and the dosing port is connected to the dosing box through a pipeline, and is used to add flocculant to the first flocculation-settling tank and the second flocculation-settling tank; between the first flocculation-settling tank and the second The bottom of the flocculation sedimentation tank is equipped with a sewage outlet for discharging the sediment at the bottom of the tank. A microporous aerator is provided at the inner bottom of the catalytic oxidation tower, and the microporous aerator is connected with a blower arranged outside the catalytic oxidation tower through a pipeline.

The side wall of the first flocculation tank is provided with a waste water inlet connected to the waste water to be treated, and the catalytic oxidation tower placed downstream among the catalytic oxidation towers connected in series is provided with a liquid outlet.

In order to improve the pretreatment effect on pollutants in the inner electrolytic reaction tower, an aerator is provided at the inner bottom of the inner electrolytic reaction tower, and the aerator is connected with a fan arranged outside the inner electrolytic reaction tower through a pipeline. The number of catalytic oxidation towers is three or four, and the specific number of catalytic oxidation towers used in the actual reaction is determined by the water quality to be treated. In addition, both the catalytic oxidation tower and the internal electrolytic reaction tower are connected with COD online monitors and ammonia nitrogen online monitors, which are used to monitor the COD and ammonia nitrogen indicators of the wastewater in the catalytic oxidation tower and the internal electrolytic reaction tower in real time. The reaction process in the oxidation tower and the internal electrolysis reaction tower; and the COD online monitor and ammonia nitrogen online monitor installed in the catalytic oxidation tower can also indicate the replacement of the catalyst in the catalytic oxidation tower according to the trend of the monitored indicators with the reaction time .

In the above-mentioned treatment system, as shown in the process flow diagram of Figure 2, the treatment of waste water is carried out as follows:

a. Flocculation and precipitation: add flocculants to the waste water to be treated, the flocculants include sulfonate, phosphate ester salt, lime, sodium silicate, calcium hypochlorite, carboxymethyl cellulose sodium salt, swelling fraction, Attapulgite, volcanic rock powder, flocculant dosage is 0.1-0.05% of the waste water, mixed evenly and then statically settled to obtain supernatant liquid.

b. Internal electrolysis: adjust the pH and temperature of the supernatant, then add iron-carbon fillers to the wastewater, and perform aeration at the bottom of the wastewater.

c, flocculation precipitation: add flocculant to the waste water after step b treatment, described flocculant comprises sulfonate, phosphate ester salt, lime, sodium silicate, calcium hypochlorite, carboxymethyl cellulose sodium salt, Bentonite, attapulgite, volcanic rock powder, flocculant dosage is 0.1-0.05% of the waste water, mixed evenly and then statically settled to obtain a supernatant. ;

d. Catalytic oxidation of hydrogen peroxide: multiple sets of catalytic oxidation steps in series are performed on the supernatant obtained after the treatment in step c, and a catalyst is added to the supernatant in each set of catalytic oxidation steps, and the catalyst is loaded on the carrier by the carrier The active component on the carrier is at least one of diatomaceous earth, zeolite, ceramsite, and molecular sieve, and the active component includes at least one of silicon dioxide, calcium oxide, aluminum oxide, iron oxide, ferrous oxide, and titanium dioxide. One; then add hydrogen peroxide, mix well, and react for 0.5-2h under aeration conditions.

After treatment, the effluent water quality COD≤500mg/L, ammonia nitrogen≤200mg/L, and suspended solids≤70mg/L, so that the effluent can meet the third-level discharge standard of the "Integrated Wastewater Discharge Standard", that is, the tube standard, so as to facilitate the subsequent biochemical treatment of the wastewater Discharge or reuse after treatment.

In summary, the wastewater pretreatment method of the present invention solves the problem that the coal chemical industry wastewater is difficult to treat because it contains inorganic pollutants such as heavy metals and cyanide, and is rich in high concentrations of ammonia nitrogen, SS, and refractory, toxic and harmful organic substances. After being treated by the pretreatment method, waste water capable of biochemical treatment can be obtained, and the waste water can be directly discharged or recycled for reuse after being directly subjected to biochemical treatment. The pretreatment system of the present invention has stable operation and can effectively make the coal chemical industry wastewater biochemical. Therefore, the coal chemical wastewater treatment method and treatment system of the present invention have positive popularization significance and significant application value.

Claims (10)

1. a kind of preprocess method of coal chemical industrial waste water, to improve the biodegradability of waste water in order to subsequent biochemical processing, It is characterized in that, this method includes flocculation sediment processing, catalytic oxidation treatment, Inner electrolysis processing；

In the flocculation sediment processing, flocculant includes following components：Sulfonate, phosphate ester salt, lime part, sodium metasilicate, secondary chlorine Sour calcium, sanlose, bentonite, attapulgite, volcano stone flour；

In the catalytic oxidation treatment, catalyst is made of carrier and the active component being carried on carrier, and the carrier is silicon At least one of diatomaceous earth, zeolite, haydite, molecular sieve, the active component include silica, calcium oxide, aluminium oxide, oxidation At least one of iron, ferrous oxide, titanium dioxide；Oxidant is hydrogen peroxide.

2. the preprocess method of coal chemical industrial waste water according to claim 1, it is characterised in that：The flocculation sediment processing packet Two step flocculation sediments are included, one step flocculation sediment is used to first carry out flocculation sediment, another step flocculation to pending coal chemical industrial waste water Precipitation to Inner electrolysis treated waste water for carrying out flocculation sediment；

The flocculant dosage is the 0.05~0.1% of wastewater flow rate.

3. the preprocess method of coal chemical industrial waste water according to claim 1, it is characterised in that：The catalytic oxidation treatment is set Before Inner electrolysis processing or the catalytic oxidation treatment is placed in the Inner electrolysis and handles the flocculation sediment in downstream and handles it Afterwards；

The catalytic oxidation treatment includes concatenated multigroup catalytic oxidation stage, and every group of catalytic oxidation stage is in catalyst, double 0.5-2h is reacted under the presence of oxygen water and aeration condition.

4. the preprocess method of coal chemical industrial waste water according to claim 1, it is characterised in that：In the Inner electrolysis processing, Air Exposure is carried out in the presence of iron carbon filler.

5. the preprocess method of coal chemical industrial waste water according to claim 1, it is characterised in that：It is handled through the preprocess method Effluent quality COD≤500mg/L afterwards, ammonia nitrogen≤200mg/L, suspended matter≤70mg/L.

6. a kind of pretreatment system of coal chemical industrial waste water as described in claim 1, it is characterised in that：

The pretreatment system includes the first flocculation sedimentation tank being sequentially connected, several catalysis oxidizing towers being connected in series with, Inner electrolysis Reaction tower and the second flocculation sedimentation tank；It is equipped with dosing mouth at the top of first flocculation sedimentation tank and the second flocculation sedimentation tank, Bottom is equipped with sewage draining exit, and the dosing mouth is connect by pipeline with dosing tank；Bottom is equipped with micropore in the catalysis oxidizing tower Aerator, the micro-hole aerator are connected by pipeline with the air blower being set to outside catalysis oxidizing tower；

The first flocculation basin side wall is equipped with the waste water inlet being connected with pending waste water, is set on the second flocculation basin side wall There is liquid outlet.

7. a kind of pretreatment system of coal chemical industrial waste water as described in claim 1, it is characterised in that：

The pretreatment system includes the first flocculation basin being sequentially connected, Inner electrolysis reaction tower, the second flocculation sedimentation tank and several strings Join the catalysis oxidizing tower of connection；It is equipped with dosing mouth, bottom at the top of first flocculation sedimentation tank and the second flocculation sedimentation tank It is equipped with sewage draining exit, the dosing mouth practices grade by pipeline and dosing tank；Bottom is equipped with micro-pore aeration in the catalysis oxidizing tower Device, the micro-hole aerator are connected by pipeline with the air blower being set to outside catalysis oxidizing tower；

The first flocculation sedimentation tank side wall is equipped with the waste water inlet that is connected with pending waste water, it is several be connected in series with it is described The catalysis oxidizing tower that downstream is placed in catalysis oxidizing tower is equipped with liquid outlet.

8. the pretreatment system of the coal chemical industrial waste water described according to claim 6 or 7, it is characterised in that：The Inner electrolysis reaction Bottom is equipped with aerator in tower, and the aerator is connected by pipeline with the wind turbine being set to outside Inner electrolysis reaction tower.

9. the pretreatment system of the coal chemical industrial waste water described according to claim 6 or 7, it is characterised in that：The catalysis oxidizing tower Number be three or four.

10. the pretreatment system of the coal chemical industrial waste water described according to claim 6 or 7, it is characterised in that：The catalysis oxidizing tower With COD on-line computing models and ammonia nitrogen on-line computing model are respectively connected on Inner electrolysis reaction tower.