CN112010511B - Treatment process for industrial production wastewater treatment - Google Patents

Abstract

The invention discloses a treatment process for industrial production wastewater treatment, which has the technical scheme that the treatment process comprises an oil-separating slag-separating well, a comprehensive adjusting tank, a flocculation sedimentation tank, a chamber type filter press, a wastewater treatment host machine and a reuse water tank, wherein the wastewater treatment host machine comprises a wastewater treatment process of a flow anaerobic tank, a biological contact oxidation tank, a molecular sieve deep-bed filter tank and a biomass deep-bed filter tank; the wastewater treatment complete equipment integrates various component equipment into one equipment, and the production wastewater output by the target stainless steel production process is treated step by step, wherein the treatment process comprises the steps of adopting a mechanical pressure filtration mud-water separation technology, a molecular sieve deep bed filter tank and a biomass deep bed filter tank technology, and finally, the output wastewater meeting the standard and can be reused for production.

Description

Treatment process for industrial production wastewater treatment

Technical Field

The invention relates to the field of wastewater treatment, in particular to a treatment process for treating industrial production wastewater.

Background

The Fujian province has a large number of stainless steel casting (precision casting) enterprises with different small and medium scales, and the enterprises generally have the problems that the daily discharge amount of production wastewater is small, the discharge is uneven, the site where a plant area can be used for building a soil building structure of a sewage treatment station is quite limited (large-area excavation has the fear of influencing the structural safety of a building beside a side), and the industrial or municipal sewage treatment plant where the plant area is not provided with government investment can lead the pretreated wastewater discharged by the enterprises to be connected into a sewage plant pipe network, and the like. Therefore, in order to solve the problem of wastewater treatment of enterprises, the enterprises research and develop the equipment according to the characteristics of the wastewater such as water quality, water quantity, discharge time, product production strength and site limitation.

Disclosure of Invention

In view of the above-mentioned needs, the present invention provides a small-sized complete plant for wastewater treatment, which is composed of a plurality of devices, and uses a mechanical filter press sludge-water separation technique and a molecular sieve deep bed filter and biomass deep bed filter technique to effectively remove various pollutants from a target water body, and has a wide range of extended applicability, and can be further adjusted and applied to small-sized wastewater treatment in various industries.

In order to achieve the purpose, the invention provides the following technical scheme: a small-scale complete sets for industrial wastewater treatment which characterized in that: comprises the following steps of sequentially setting according to the water treatment process flow

The oil and slag separating well comprises an oil scraping device and a liquid circulation driving device, and is used for removing grease with specific gravity being lighter than water from the surface of a water body and settling large particles with specific gravity being heavier than water at the bottom of the well for removing;

the comprehensive adjusting tank is used for storing water and homogenizing water quality and water quantity, and comprises a fluidizer for physically and uniformly mixing and adjusting water quality and adjusting water quantity through stored water;

the flocculation sedimentation tank comprises a medicament feeding control system and a stirring system, is used for aggregating pollutants into floccules which are convenient to separate, and removing partial heavy metal substances, and has the working duration of medicament feeding reaction of 60 min;

the chamber type filter press is used for separating flocculent pollutants from a water body by filtering the flocculated water body and squeezing sludge into blocks, and comprises filter cloth for adjusting the filtering effect;

the wastewater treatment host comprises a flow anaerobic tank, a biological contact oxidation tank, a molecular sieve deep bed filter tank and a biomass deep bed filter tank, is used for receiving water discharged by a chamber filter press, and removing ammonia nitrogen, water toxicity and pollutants, and further comprises a water quality detector, wherein the water quality detector is positioned at the water outlet end of the wastewater treatment host and is used for detecting the water quality condition of the effluent of the wastewater treatment host, the water quality detector starts a water pump to convey water to a reuse water tank after detecting that the water quality meets the discharge standard, and the water is reintroduced into a flocculation sedimentation tank to be circulated and treated according to the process flow if the water quality does not meet the discharge standard;

the recycling water tank comprises a standard discharge port and is used for receiving and storing the water body passing through the wastewater treatment host machine for the next recycling or discharging.

As a further arrangement of the scheme, the system also comprises a wastewater treatment equipment controller which is connected with the water quality detector and all the wastewater treatment units and used for controlling the working condition of the whole set of equipment.

As the further arrangement of the scheme, the wastewater treatment machine is provided with a sludge discharge hole, the sludge discharge hole is connected with a sludge pump for actively pumping the discharge, and the wastewater treatment machine also comprises a plurality of water pumps which are connected with a wastewater treatment equipment controller and used for providing flow force for the water body in the treatment process.

As a further arrangement of the scheme, the flow state anaerobic tank, the biological contact oxidation tank, the molecular sieve deep bed filter tank and the biomass deep bed filter tank are provided with pipelines and valves through the mutual arrangement, and the mutual water body circulation is controlled through the switch of the valves.

As a further arrangement of the scheme, the device also comprises a plurality of fans, and the fans adopt three-blade Roots blowers.

The small-sized wastewater treatment complete equipment further comprises a treatment process, and is characterized in that: the method comprises the following steps:

s1, installing the small-sized wastewater treatment complete equipment at a wastewater discharge outlet, and connecting the wastewater discharge outlet with an oil and slag separation well;

s2, enabling the production wastewater to enter an oil and slag separating well, and standing and precipitating: standing and precipitating for 30min, wherein the parameter u =2.8m3/m 2. h; after removing the upper grease and the water body of the settled impurities at the bottom of the well, the output water body meets the following requirements through the inspection of an instrument: the petroleum is less than or equal to 1 mg/L;

s3, inputting the water body meeting the standard obtained in the step S2 into a comprehensive adjusting tank, and uniformly mixing the wastewater through a fluidization device arranged in the comprehensive adjusting tank, wherein the water storage time is 8-10h and the water storage time is used for homogenizing the water quality and water quantity of the water body;

s4, leading the wastewater into a flocculation sedimentation tank from the comprehensive adjusting tank through a water pump, and adding a neutralizing agent into water in the tank: lime and flocculating agent: polymerizing aluminum chloride, reacting in a flocculation sedimentation tank for 60min, and gathering pollutants into floriated floccules by utilizing the functions of a flocculating agent on adsorption bridging, net catching and double electric layer compression of the pollutants in a water body;

s5, leading the water body in the flocculation sedimentation tank into a chamber type filter press, filtering the water body after flocculation reaction by a physical pressurization filtering principle, separating pollutants forming flocs from the water body, and realizing the filtering standard of the chamber type filter press: the filter area is less than 60 square meters, the water outlet SS is less than or equal to 70mg/L, and the filter cloth area can be adjusted to adjust the filter effect through actual conditions;

s6, the filtered water body is treated by a wastewater treatment host machine mainly comprising a flow anaerobic tank, a biological contact oxidation tank, a molecular sieve deep bed filter tank and a biomass deep bed filter tank, organic pollutants in the water body are efficiently degraded into carbon dioxide and water, ammonia nitrogen is fundamentally removed through treatment, trace toxic substances in dissolved water are reduced, and the quality of effluent water is greatly improved;

s7, detecting the discharged water of the wastewater treatment host machine through a water quality sensor, judging whether the water quality reaches the standard, if not, guiding the water body into a flocculation sedimentation tank through a water pump to filter pollutants, repeating the steps according to the process, and finally guiding the water body into the wastewater treatment host machine to treat;

and S8, repeating the steps from S5 to S6 until the finally treated effluent in the wastewater treatment host reaches the discharge standard, opening a valve to guide the effluent into a reuse water tank for standing, and reusing the treated effluent for production.

As a further arrangement of the scheme, the production wastewater comprises pickling process wastewater, passivation process wastewater, ultrasonic electrolysis process wastewater, wax-making process wastewater and low-temperature wax soaking wastewater.

Compared with the existing wastewater treatment equipment, the industrial wastewater treatment equipment has the advantages of simple structure and reasonable design, multiple functional components are integrated to occupy very small area and volume, and compared with the existing industrial wastewater treatment equipment which is too fat, the components of the technical scheme of the invention all adopt the conventional components purchased in the market, and are reasonably designed and integrated on the basis of the conventional components.

In conclusion, the invention has the following beneficial effects: the whole set of equipment and process system is simple to operate, a sedimentation tank and a sludge tank are not required to be arranged, sludge is directly squeezed into blocks, the problem of subsequent sludge treatment is solved, and aiming at the characteristics of stainless steel production wastewater, the mechanical pressure filtration sludge-water separation technology and the molecular sieve deep bed filter tank and biomass deep bed filter tank technology are mainly combined and adopted, so that the system has wide applicability in the stages of wastewater pretreatment and deep biochemical treatment, and various pollutants in a water body can be effectively removed;

wherein, a mechanical filter-pressing mud-water separation technology is adopted;

the first point is as follows: the box-type filter press is arranged in a flocculation sedimentation tank, the wastewater after flocculation reaction is completely fed into the box-type filter press for filter pressing, and the sludge is squeezed into blocks and bagged for outward transportation, so that a sedimentation tank and a sludge concentration tank which are complicated, complex and large in occupied area in the traditional scheme are replaced;

and a second point: the filter-pressed filtrate enters a wastewater treatment host machine for further treatment, the filtrate after flocculation mechanical compression is further subjected to anaerobic and aerobic reaction treatment and then deep bed filter treatment, organic pollutants in the stainless steel industrial wastewater are efficiently degraded into carbon dioxide and water, ammonia nitrogen is fundamentally removed through treatment, trace toxic substances in dissolved water are reduced, and the quality of effluent water is greatly improved;

the third point, the gathering that this scheme of adoption can save the flocculating constituent greatly, deposit and the enriched time, the flocculating constituent settling time has not only been shortened greatly, follow-up sedimentation tank and the sludge impoundment that need not to set up moreover, the civil engineering investment is few, it is little to occupy the place, civil engineering construction safety, the partial set that will construct the civil engineering pond originally designs into waste water treatment host computer equipment, the excavation construction investment expense in civil engineering pond has been reduced, the civil engineering volume that has significantly reduced, civil engineering only deposits oil-separating sediment well, equalizing basin and van-type pressure filter base construction.

In addition, each link of the technical scheme can be further adjusted and expanded to be suitable for small-sized wastewater treatment in various industries, and particularly accords with the theme of sustainable scientific development advocated at present, so that the scheme greatly saves the site while reducing the civil engineering investment, and avoids the problem of foundation pit construction safety brought by earthwork excavation (the safety of a nearby building structure is influenced).

Drawings

FIG. 1 is a schematic process flow diagram of an embodiment of the present invention;

FIG. 2 is a schematic view showing the equipment involved in the process for treating the production wastewater according to the embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The invention is mainly used for treating the wastewater on the surface of the stainless steel workpiece with the wastewater treatment capacity (Q) less than or equal to 100m3/d on the basis of considering the investment cost.

The invention scheme and the design principle of the application seriously execute the national economic construction policy, and the technical standard of the invention follows the existing indexes and specifications:

1.1 Water law of the people's republic of China;

1.2 environmental protection law of the people's republic of China and water pollution prevention and treatment law;

1.3 regeneration and utilization of urban sewage-classification (GB 18919-2002);

1.4 regeneration and utilization of urban sewage-quality of industrial water (GB 19923-2005);

1.5 Integrated wastewater discharge Standard (GB 8978-1996);

1.6 handbook of Water supply and drainage design (third edition);

1.7 structural design Specifications of Water supply and drainage engineering (GB 50069-2002);

1.8 design Specifications for water supply and drainage of buildings (GB 50015-2010);

1.9 "water use in industry" quota (DB 35/T772-2013);

1.10 "design Specification for outdoor drainage" (GB 50014-2006) (2016 edition);

1.11 outdoor Water supply design Specifications (GB 50013-2006);

1.12 discharge Standard of pollutants for municipal wastewater treatment plants (GB 18918-2002);

1.13 Water quality Standard for Sewage discharge into urban sewer (GB/T31962. sup. 2015);

1.14 technical Specifications for water supply and drainage in towns (GB 50788-2012);

1.15 City water supply engineering planning Specification (GB 50282-2016);

1.16 urban drainage engineering planning Specifications (GB 50318-2017);

1.17 quality Standard of surface Water Environment (GB 3838-2002);

1.18 flood protection Standard (GB 50201-2014);

1.19 engineering design Specification for the regeneration and utilization of urban sewage (GB 50335-;

1.20 Pump station design Specifications (GB 50265-2010);

1.21 "urban Sewage treatment engineering project construction Standard" (revised) Beijing in 2001;

1.22 general Specifications for mechanical equipment installation engineering construction and acceptance (GB 50231-2009);

1.23 "Industrial Metal piping engineering construction Specifications" (GB 50235-2010);

1.24 "industrial enterprise design health standards" (GBZ 1-2010);

1.25 general electric equipment power distribution design Specification (GB 50055-2011);

1.26 "design Specifications for Power supply and distribution systems" (GB 50052-2009);

1.27 "Low Voltage distribution design Specification" (GB 50054-2011);

1.28 building structure load code (GB 50009-2012);

1.29 specification of concrete structure design (GB 50010-2010) (2015 edition);

1.30 building foundation design code (GB 50007-2011);

1.31 technical Specification for treatment of building foundations (JGJ 79-2012).

The technical scheme of the invention is designed from a wastewater discharge port and ends at an outlet of a reuse water tank, and related connecting pipeline engineering and commercially available equipment are common knowledge of people in the field.

As shown in fig. 1-2, a small-sized plant for industrial wastewater treatment is characterized in that: comprises the following steps of sequentially setting according to the water treatment process flow

The oil and slag separating well comprises an oil scraping device and a liquid circulation driving device, and is used for removing grease with specific gravity being lighter than water from the surface of a water body and settling large particles with specific gravity being heavier than water at the bottom of the well for removing;

the comprehensive adjusting tank is used for storing water and homogenizing water quality and water quantity, and comprises a fluidizer for physically and uniformly mixing and adjusting water quality and adjusting water quantity through stored water;

the flocculation sedimentation tank comprises a medicament feeding control system and a stirring system, is used for aggregating pollutants into floccules which are convenient to separate, and removing partial heavy metal substances, and has the working duration of medicament feeding reaction of 60 min;

the chamber type filter press is used for separating flocculent pollutants from a water body by filtering the flocculated water body and squeezing sludge into blocks, and comprises filter cloth for adjusting the filtering effect;

the wastewater treatment host comprises a flow anaerobic tank, a biological contact oxidation tank, a molecular sieve deep bed filter tank and a biomass deep bed filter tank, is used for receiving water discharged by a chamber filter press, and removing ammonia nitrogen, water toxicity and pollutants, and further comprises a water quality detector, wherein the water quality detector is positioned at the water outlet end of the wastewater treatment host and is used for detecting the water quality condition of the effluent of the wastewater treatment host, the water quality detector starts a water pump to convey water to a reuse water tank after detecting that the water quality meets the discharge standard, and the water is reintroduced into a flocculation sedimentation tank to be circulated and treated according to the process flow if the water quality does not meet the discharge standard;

the recycling water tank comprises a standard discharge port and is used for receiving and storing the water body passing through the wastewater treatment host machine for the next recycling or discharging.

As a further arrangement of the scheme, the system also comprises a wastewater treatment equipment controller which is connected with the water quality detector and all the wastewater treatment units and used for controlling the working condition of the whole set of equipment.

As the further arrangement of the scheme, the wastewater treatment machine is provided with a sludge discharge hole, the sludge discharge hole is connected with a sludge pump for actively pumping the discharge, and the wastewater treatment machine also comprises a plurality of water pumps which are connected with a wastewater treatment equipment controller and used for providing flow force for the water body in the treatment process.

As a further arrangement of the scheme, the flow state anaerobic tank, the biological contact oxidation tank, the molecular sieve deep bed filter tank and the biomass deep bed filter tank are provided with pipelines and valves through the mutual arrangement, and the mutual water body circulation is controlled through the switch of the valves.

As a further arrangement of the scheme, the device also comprises a plurality of fans, and the fans adopt three-blade Roots blowers.

The production wastewater of the stainless steel production process flow comprises pickling, passivation, electrolysis and ultrasonic cleaning wastewater. In addition, there are some wax-making wastewater (low-temperature wax), urea core-dissolving wastewater, tree bunch-cleaning wastewater, and steam dewaxing wastewater.

According to the water quality condition of the implemented project, the wastewater mainly comes from wastewater discharged by the following production processes of a production enterprise:

in the pickling process, a mixed solution of 100% hydrofluoric acid and 50% nitric acid is generally used to remove various greasy dirt, oxide skin, rust, welding spots and the like from the workpiece, so that the waste water discharged by pickling cleaning mainly contains metal substances such as fluorine ions, nitrate ions, iron and nickel and the like.

The passivation process generally adopts the action of chromic acid concentrated solution and metal on the surface of a workpiece to generate a trivalent or hexavalent chromium coating, so that the waste water discharged by passivation cleaning mainly contains chromium compounds, phosphorus compounds and the like.

The ultrasonic process drives liquid to vibrate in the cleaning tank through a high-frequency oscillation signal, so that a large number of small bubbles are formed, and the dirt on the surface of a workpiece can be cleaned up by high temperature and instantaneous high pressure caused by the closing of the small bubbles. Therefore, the wastewater discharged by ultrasonic cleaning mainly contains oil stains, suspended matters, sand, emulsion and the like.

The wax making process is in an enterprise which adopts low-temperature wax to make a wax mould (the medium-temperature wax does not have the process), and the low-temperature wax is generally treated by sulfuric acid with the concentration of more than 98 percent, and hydrochloric acid or oxalic acid can also be adopted. Therefore, the wax production wastewater discharged from this step mainly contains wax, sulfate radicals, and the like.

The hardening of the mould shell of the low-temperature wax requires that the mould shell is soaked in aluminum chloride/magnesium chloride/ammonium chloride (natural air drying is adopted for the medium-temperature wax mould shell), so that the cleaning wastewater contains aluminum/magnesium/amine and the like.

In conclusion, the wastewater inlet quality condition of the production wastewater of the project is mainly polluted:

the small-sized wastewater treatment complete equipment further comprises a treatment process, and is characterized in that: the method comprises the following steps:

s1, installing the small-sized wastewater treatment complete equipment at a wastewater discharge outlet, and connecting the wastewater discharge outlet with an oil and slag separation well;

s2, enabling the production wastewater to enter an oil and slag separating well, and standing and precipitating: standing and precipitating for 30min, wherein the parameter u =2.8m3/m 2. h; after removing the upper grease and the water body of the settled impurities at the bottom of the well, the output water body meets the following requirements through the inspection of an instrument: the petroleum is less than or equal to 1 mg/L;

s3, inputting the water body meeting the standard obtained in the step S2 into a comprehensive adjusting tank, and uniformly mixing the wastewater through a fluidization device arranged in the comprehensive adjusting tank, wherein the water storage time is 8-10h and the water storage time is used for homogenizing the water quality and water quantity of the water body;

s4, leading the wastewater into a flocculation sedimentation tank from the comprehensive adjusting tank through a water pump, and adding a neutralizing agent into water in the tank: lime and flocculating agent: polymerizing aluminum chloride, reacting in a flocculation sedimentation tank for 60min, and gathering pollutants into floriated floccules by utilizing the functions of a flocculating agent on adsorption bridging, net catching and double electric layer compression of the pollutants in a water body;

s5, leading the water body in the flocculation sedimentation tank into a chamber type filter press, filtering the water body after flocculation reaction by a physical pressurization filtering principle, separating pollutants forming flocs from the water body, and realizing the filtering standard of the chamber type filter press: the filter area is less than 60 square meters, the water outlet SS is less than or equal to 70mg/L, and the filter cloth area can be adjusted to adjust the filter effect through actual conditions;

s6, the filtered water body is treated by a wastewater treatment host machine mainly comprising a flow anaerobic tank, a biological contact oxidation tank, a molecular sieve deep bed filter tank and a biomass deep bed filter tank, organic pollutants in the water body are efficiently degraded into carbon dioxide and water, ammonia nitrogen is fundamentally removed through treatment, trace toxic substances in dissolved water are reduced, and the quality of effluent water is greatly improved;

s7, detecting the discharged water of the wastewater treatment host machine through a water quality sensor, judging whether the water quality reaches the standard (the standard is the standard of 'process and product water' in the following 'quality of municipal wastewater recycling industrial water' (GB/T19923-2005)), if the water quality does not reach the standard, selecting to lead the water body into a flocculation sedimentation tank through a water pump to filter pollutants, repeating the process step by step, and finally leading the water body into the wastewater treatment host machine to be treated;

and S8, repeating S5-S6 until the effluent finally treated in the wastewater treatment host reaches the discharge standard (the standard is the standard of 'process and product water' in the 'quality of municipal wastewater recycling industrial water' (GB/T19923-2005)), opening a valve to guide the effluent into a reuse water tank for standing, and reusing the treated effluent for production.

As a further arrangement of the scheme, the production wastewater comprises pickling process wastewater, passivation process wastewater, ultrasonic electrolysis process wastewater, wax-making process wastewater and low-temperature wax soaking wastewater.

The equipment is mainly used for treating the production wastewater of the stainless steel process, has obvious effect, and particularly realizes that the treated discharge water meets the partial standard of ' process and product water ' in the water quality for municipal wastewater recycling industry (GB/T19923-2005) of the people's republic of China:

and the first class of pollutants implements the part of the highest allowable discharge concentration standard in the integrated wastewater discharge standard of the people's republic of China (GB 8978-1996):

the treated effluent meets the standard, and the production water for specific industries can be recycled.

Compared with the existing wastewater treatment equipment, the device has the advantages of simple structure and reasonable design, integrates a plurality of functional components to occupy small area and volume, adopts commercially available conventional components on the basis of the conventional components, reasonably designs the components to be integrated and installed, can perform environment-friendly treatment on the production wastewater generated in the stainless steel process through a one-step treatment process, recycles the wastewater treated by the conventional components for production requirements, saves a large amount of water resources, concentrates pollutants treated by the conventional components, and is very convenient to collect.

Secondly, the whole set of equipment and process system is simple to operate, a sedimentation tank and a sludge tank are not required to be arranged, sludge is directly squeezed into blocks, the problem of subsequent sludge treatment is solved, and aiming at the characteristics of stainless steel production wastewater, a mechanical pressure filtration sludge-water separation technology and a molecular sieve deep bed filter tank and biomass deep bed filter tank technology are adopted, so that the set of system has wide applicability in the stages of wastewater pretreatment and advanced biochemical treatment, various pollutants in a water body can be effectively removed, and the mechanical pressure filtration sludge-water separation technology is adopted;

the applicant carries out comparative tests on the existing wastewater: the traditional sedimentation tank and sludge concentration tank adopted by the existing treatment scheme separate and compress sludge, the sedimentation time of the sedimentation tank needs at least 1.8h, the compression time is at least 5.4h, and the total time is 7.2h, but the technology of the scheme has the same sludge treatment result, but the operation is not but fast and only needs 2h, and the operation is simpler in one step;

the first point is as follows: after the chamber filter press is arranged in the flocculation sedimentation tank, the wastewater after flocculation reaction is completely fed into the chamber filter press for filter pressing, and the sludge is squeezed into blocks and bagged for outward transportation;

and a second point: the filter-pressed filtrate enters a wastewater treatment host machine for further treatment, the filtrate after flocculation mechanical compression is further subjected to anaerobic and aerobic reaction treatment and then deep bed filter treatment, organic pollutants in the stainless steel industrial wastewater are efficiently degraded into carbon dioxide and water, ammonia nitrogen is fundamentally removed through treatment, trace toxic substances in dissolved water are reduced, and the quality of effluent water is greatly improved;

the third point, the gathering of flocculating constituent can be saved greatly to this scheme, sediment and the enriched time, the flocculating constituent settling time has not only been shortened greatly, follow-up sedimentation tank and the sludge impoundment of need not to set up moreover, the civil engineering investment is few, it is little to occupy the place, civil engineering construction safety, the partial set that will construct the civil engineering pond originally designs into waste water treatment host computer equipment, the excavation construction investment expense in civil engineering pond has been reduced, the civil engineering work volume that has significantly reduced, civil engineering only deposits oil-separating sediment well, equalizing basin and van-type pressure filter base construction.

In addition, each link of the technical scheme can be further adjusted and expanded to be suitable for small-sized wastewater treatment in various industries, and particularly accords with the theme of sustainable scientific development advocated at present, so that the scheme greatly saves the site while reducing the civil engineering investment, and avoids the problem of foundation pit construction safety brought by earthwork excavation (the safety of a nearby building structure is influenced).

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the design concept of the present invention should be included in the scope of the present invention.

Claims (1)

1. A treatment process for industrial production wastewater treatment is characterized in that: the method comprises the following steps:

s1, mounting the small-sized complete equipment for treating wastewater at a wastewater discharge outlet of pickling process wastewater, passivation process wastewater, ultrasonic electrolysis process wastewater, wax-making process wastewater and low-temperature wax soaking wastewater, wherein the wastewater discharge outlet is connected with an oil and slag separation well for mounting;

s2, enabling the production wastewater to enter an oil and slag separating well, and standing and precipitating: standing for 30min, with parameter u =2.8m³/m²H; after removing the upper grease and the water body of the settled impurities at the bottom of the well, the output water body meets the following requirements through the inspection of an instrument: the petroleum is less than or equal to 1 mg/L;

s3, inputting the water body meeting the standard obtained in the step S2 into a comprehensive adjusting tank, and uniformly mixing the wastewater through a fluidization device arranged in the comprehensive adjusting tank, wherein the water storage time is 8-10h and the water storage time is used for homogenizing the water quality and water quantity of the water body;

s4, leading the wastewater into a flocculation sedimentation tank from the comprehensive adjusting tank through a water pump, and adding a neutralizing agent into water in the tank: lime and flocculating agent: polymerizing aluminum chloride, reacting in a flocculation sedimentation tank for 60min, and gathering pollutants into floriated floccules by utilizing the functions of a flocculating agent on adsorption bridging, net catching and double electric layer compression of the pollutants in a water body;

s5, leading-in chamber filter press of water through flocculation and precipitation pond filters the water through flocculation reaction through physics pressurization filteration's principle, separates the pollutant that will form the floc from the water to squeeze mud into pieces, chamber filter press's filtration standard: the filter area is less than 60 square meters, the water outlet SS is less than or equal to 70mg/L, and the filter cloth area can be adjusted to adjust the filter effect through actual conditions;

s6, the filtered water body is treated by a wastewater treatment host machine mainly comprising a flow anaerobic tank, a biological contact oxidation tank, a molecular sieve deep bed filter tank and a biomass deep bed filter tank, organic pollutants in the water body are efficiently degraded into carbon dioxide and water, ammonia nitrogen is fundamentally removed through treatment, trace toxic substances in dissolved water are reduced, and the quality of effluent water is greatly improved;

s7, detecting the discharged water of the wastewater treatment host machine through a water quality sensor, judging whether the water quality reaches the standard, if not, guiding the water body into a flocculation sedimentation tank through a water pump to filter pollutants, repeating the steps according to the process, and finally guiding the water body into the wastewater treatment host machine to treat;

and S8, repeating the steps from S5 to S6 until the finally treated effluent in the wastewater treatment host reaches the discharge standard, opening a valve to guide the effluent into a reuse water tank for standing, and reusing the treated effluent for production.

Images