CN112939334A - Recycling and treating method for cold-rolling wastewater containing acid, alkali and thick oil - Google Patents
Recycling and treating method for cold-rolling wastewater containing acid, alkali and thick oil Download PDFInfo
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- 238000005097 cold rolling Methods 0.000 title claims abstract description 19
- 238000004064 recycling Methods 0.000 title claims abstract description 18
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- 230000014759 maintenance of location Effects 0.000 claims description 3
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- 239000003795 chemical substances by application Substances 0.000 claims description 2
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/203—Iron or iron compound
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Activated Sludge Processes (AREA)
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Abstract
The invention discloses a recycling treatment method of cold rolling wastewater containing acid, alkali and thick oil, which comprises the following steps: 1) treating concentrated oil wastewater; 2) treating acid-containing and alkali-containing wastewater; 3) a sludge treatment step; acid-base neutralization method is adopted to treat acid-base containing waste water, inorganic ceramic membrane ultrafiltration method and microbial degradation method are adopted to treat cold rolling thick oil waste water, thick oil is recycled, and sludge can be used as raw material for iron making; the wastewater is treated biochemically and then discharged together with the acidic wastewater; according to the invention, by means of combining inorganic ceramic membrane ultrafiltration and microbial reaction, after oil and water in the wastewater are separated, most organic matters and oil in the wastewater are metabolized by microbes, so that the quality of the cold rolling wastewater discharge water reaches the pollutant discharge standard limit, and after oil-containing wastewater is subjected to oil-water separation, concentrated oil is recycled, and the generated sludge can be used as a raw material for iron making, so that clean production and sustainable development are realized.
Description
Technical Field
The invention relates to the technical field of cold rolling wastewater treatment, in particular to a method for recycling and treating cold rolling wastewater containing acid, alkali and thick oil.
Background
The water environment pollution condition in China is quite serious, a large amount of high-concentration acid-base-containing wastewater and organic matter wastewater which is difficult to degrade are directly discharged without any treatment, water source water is seriously polluted, and the water environment is damaged. The sewage treatment facilities in China are generally backward, the sewage treatment rate is low, the sewage treatment facility is one of the main reasons for causing the water environment pollution in China, and simultaneously the treatment cost is high, so that a large amount of high-concentration acid-containing alkali-containing wastewater and organic matters which are difficult to degrade are discharged without being effectively treated. How to economically, efficiently and pollution-free treat the wastewater containing acid, alkali and thick oil in the steel industry becomes a technical problem in the environmental protection water treatment industry of China.
In the cold rolling production process, a large amount of wastewater containing acid, alkali and thick oil is generated, the wastewater mainly contains emulsified oil, degreasing agent, sulfide, HCl, SS, NaOH, Fe and other organic and inorganic impurities and pollutants, and if the wastewater is directly discharged without meeting the standard requirements, the wastewater can seriously affect the surrounding environment.
Because the cold rolling concentrated oil wastewater belongs to water which is difficult to treat and has poor biochemical performance, the physicochemical treatment method is adopted in China, namely, the process routes of emulsion breaking, dosing, coagulation, precipitation, filtration and strong oxidation are adopted, and the treatment processes have the problems of complex process, poor safety, high operation cost, large sludge amount, unstable water quality of treated effluent or difficult standard discharge and the like, and have the problem of secondary pollution. Therefore, the search for a thorough and comprehensive method for wastewater treatment is an important task in front of wastewater treatment workers.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method for recycling waste water containing acid, alkali and thick oil in cold rolling.
The technical scheme adopted by the invention for solving the technical problems is as follows: a recycling treatment method for cold rolling wastewater containing acid, alkali and thick oil comprises the following steps:
1) treatment of concentrated oil wastewater
(1) Discharging concentrated oil wastewater in cold rolling wastewater into a concentrated oil wastewater storage tank, standing for layering, arranging a buoy oil scraper at the upper part of the concentrated oil wastewater storage tank, scraping floating oil into a floating oil tank by the buoy oil scraper,
(2) lifting the layered thick oil wastewater to a paper tape filter by a water pump to filter out partial impurities, then feeding the filtered thick oil wastewater into a circulating tank, and feeding the filtered thick oil wastewater into a circulating tank made of Al2O3Or an inorganic ceramic membrane ultrafiltration system of ZrO is used for oil-water separation, the floating oil overflows to a floating oil groove through an overflow groove and then enters an oil-water separation tank, 98 percent concentrated sulfuric acid is added and steam is introduced to further separate the oil from the water, the upper layer concentrated oil is recycled, the lower layer waste water enters an acid-base waste water regulating tank,
(3) the effluent of the ultrafiltration system enters a No. 1 intermediate water tank and is pumped to a first-stage PH regulating tank through a No. 1 intermediate water pump, the effluent of the first-stage PH regulating tank automatically flows to a second-stage PH regulating tank, and Ca (OH) is added into the two-stage PH regulating tanks2And concentrated H2SO4Adjusting the pH value, controlling the pH value of the wastewater to be 6.5-8.5 through two-stage pH value adjustment, enabling the wastewater to automatically flow into a No. 2 intermediate water tank,
(4) cooling the No. 2 intermediate water tank wastewater to 25-35 ℃ through a cooling tower, then feeding the wastewater into a microbial reaction tank, periodically feeding a 'doubly-fed' obligate combined flora into the microbial reaction tank through a bacterium feeding device, and simultaneously feeding an obligate nutrient agent and an anti-surfactant matched with obligate bacteria, so that the advantages and the activity of the obligate bacteria are maintained, the retention time is more than 12 hours, the temperature is controlled at 25-30 ℃, and the gas-water ratio is controlled at 30: 1, so as to improve the biochemical performance and the removal efficiency of the wastewater, and most of organic matters and oil in the wastewater are converted into CO through the metabolism of microorganisms after passing through a microbial reaction tank2And H2O, the effluent meets the discharge requirement,
(5) the wastewater after biochemical treatment enters a vertical flow sedimentation tank, sedimentation treatment is carried out by adding water purifying agent, the sedimentation time is more than 1.5 hours, the sedimentated sludge is discharged into a sludge concentration tank through a No. 1 sewage discharge pump, and the supernatant liquid is sent to an acid-base wastewater adjusting tank;
2) treatment of waste water containing acid and alkali
(1) The acid-base wastewater firstly enters an acid-base wastewater adjusting tank, is pre-aerated by introducing low-pressure air to prevent precipitation, and simultaneously, part of ferrous ions are oxidized into ferric ions to form Fe (OH) with thorough precipitation3The waste water is discharged into an acid-base primary neutralization tank and an acid-base secondary neutralization tank in turn by an acid-base waste water lift pump, and Ca (OH) is added into the acid-base neutralization tank2Or H2SO4The pH value of the solution is adjusted,
(2) the wastewater after acid-base neutralization treatment enters an acid-base sedimentation tank, coagulation sedimentation is carried out by adding a biological coagulant or coagulant aid water purifying agent, the acid-base wastewater reaches the standard and is discharged, and the precipitated sludge is pumped into a sludge concentration tank by a No. 2 sewage pump;
3) sludge treatment
Sludge generated by treating wastewater containing acid, alkali and thick oil enters a sludge concentration tank for sedimentation and concentration, the sludge is pumped into a plate-and-frame filter press by a screw pump for sludge dehydration, the water content of the dehydrated sludge is less than 75%, and dry sludge is taken as an iron-making raw material for outward transportation.
Specifically, a liquid level detection instrument is installed in the concentrated oil wastewater storage tank in the step 1.
Specifically, the paper tape filter in the step 1 is provided with a rack, a motor is installed on the rack, the motor drives a paper tape to move through a connected rolling shaft and filters part of impurities, and the motor is connected with a control system.
Specifically, a liquid level meter, a heating coil and a temperature control device are arranged in the oil-water separation tank in the step 1.
Specifically, an acid-base dosing stirring device and a pH on-line monitor are arranged in the first-stage pH adjusting tank and the second-stage pH adjusting tank in the step 1, and Ca (OH) is added into the two-stage pH adjusting tanks2Adopting a drug adding pump with model number BB50 to add H into the two-stage PH adjusting tank2SO4A sulfuric acid lift pump with the model number of 25FSB (L) -15 is adopted, the pH value of a primary pH adjusting tank is controlled to be 4-5, and the pH value of a secondary pH adjusting tank is controlled to be 6.5-8.5.
Specifically, the microbial reaction tank in the step 1 is filled with semi-soft filler, the bottom layer is provided with a variable microporous aeration head and an aeration pipe, and a Roots blower is used for blowing aeration to prevent precipitation.
Specifically, the Roots blower with the pre-aeration of FT-125 and the perforated pipe made of ABS in the step 2 introduce low-pressure air into the acid-base wastewater regulating tank for pre-aeration, and pH on-line monitors are arranged in both the acid-base primary neutralization tank and the acid-base secondary neutralization tank.
The invention has the following beneficial effects:
the invention designs a recycling treatment method of cold rolling wastewater containing acid, alkali and thick oil, which separates oil from water in the wastewater in a mode of combining inorganic ceramic membrane ultrafiltration and microbial reaction, and makes the quality of the cold rolling wastewater discharge water reach the pollutant discharge standard limit by the metabolism of microorganisms by most of organic matters and oil in the wastewater: PH of 6-9, COD less than or equal to 200mg/L, NH3N is less than or equal to 15mg/L, TN and less than or equal to 25mg/L, SS and less than or equal to 100 mg/L; and the processes of adding chemicals, demulsifying, coagulating, precipitating (or air floating), filtering and strong oxidizing in the traditional wastewater treatment process are cancelled, the technical problems of complex traditional wastewater treatment process, large sludge amount, high labor intensity, poor safety, unstable treated water quality or difficult standard discharge are solved, and after oil-containing wastewater is subjected to oil-water separation,the concentrated oil is recycled, and the generated sludge can be used as a raw material for ironmaking, so that clean production and sustainable development are realized; the purposes of reducing the operation cost, simplifying the operation, reducing the sludge treatment capacity, ensuring the quality of the effluent to be stable and reach the standard for discharge and recycling resources are achieved.
Drawings
FIG. 1 is a flow chart of a recycling treatment method of cold rolling wastewater containing acid, alkali and thick oil.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in further detail in the following clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 1, the recycling treatment method of the cold rolling wastewater containing acid, alkali and thick oil comprises the following steps:
1. treating concentrated oil wastewater:
(1) the wastewater is firstly discharged into a thick oil wastewater storage tank, a liquid level detection instrument 1 sleeve is arranged in the thick oil wastewater storage tank, a floating barrel oil scraper 1 sleeve is arranged at the upper part of the pool, oil and water are layered through standing, and floating oil is scraped to a floating oil tank through the floating barrel oil scraper.
(2) The oily wastewater at the lower layer of the concentrated oil wastewater storage tank is lifted to a paper tape filter by a concentrated oil wastewater lifting pump with the model G30-25, the paper tape filter is provided with a rack, a motor is installed on the rack, the motor drives a paper tape to move through a connected rolling shaft and filters partial impurities, and the motor is connected with a control system. Filtering out part of impurities by a paper tape filter, and allowing the filtered impurities to enter an inorganic ceramic membrane ultrafiltration device (material: support/membrane Al) with the model number of BTC12-22O3/ZrO2Specification: 37 holes, Φ 41 × 1060mm, membrane pore size: 50nm) to separate oil from water. The oil which floats upwards after continuous circulation in the oil-water separation tank overflows to the oil floating tank through the overflow tank. When the floating oil in the floating oil tank reaches a certain amount, the floating oil is pumped into an oil-water separation tank by a floating oil lift pump with the model of CSS-50.4-50, and a liquid level meter 1 sleeve, a heating coil 1 sleeve and a temperature control device are arranged in the oil-water separation tankAnd simultaneously introducing steam into the oil-water separation tank for heating, introducing 98% concentrated sulfuric acid for acidification, further separating oil from water, recycling the upper-layer floating oil, and refluxing the lower-layer wastewater into the acid-base wastewater regulating tank.
(3) Effluent of the ultrafiltration system enters a No. 1 intermediate water tank, the effluent is pumped to a first-stage PH regulating tank through a No. 1 intermediate water pump with the model of 25FSB (L) -10, the effluent flows to a second-stage PH regulating tank, and a set of acid-base dosing stirring device and a set of PH on-line monitor are arranged in the two-stage PH regulating tank. By adding Ca (OH) into a pH adjusting tank2Or concentrated H2SO4Adjusting the pH, wherein Ca (OH)2Adding the concentrated sulfuric acid by a drug adding pump with the model of BB50, adding the concentrated sulfuric acid by a sulfuric acid lifting pump with the model of 25FSB (L) -15, controlling the pH value of a first-stage pH adjusting tank to be 4-5 and the pH value of a second-stage pH adjusting tank to be 6.5-8.5, and automatically flowing the wastewater meeting the requirements through pH adjustment into a No. 2 intermediate water tank.
(4) Oily wastewater in the No. 2 intermediate water tank is discharged into a cooling tower (the wastewater cannot directly enter a microbial reaction tank due to high water temperature) with the model of 10BNG-15 through a No. 2 intermediate water pump with the model of 25FSB (L) -10, and the oily wastewater enters the microbial reaction tank for biochemical treatment after the temperature is reduced to 25-35 ℃ (the oily wastewater can surpass a cooling tower system in winter).
Semi-soft filler is filled in the microbial reaction tank, a variable microporous aeration head and an aeration pipe are arranged at the bottom layer, and a Roots blower is used for blowing aeration to prevent precipitation. In daily operation, a microorganism feeding device with the model of PT-250L is used for regularly feeding 'doubly-fed' special combined flora into a microorganism reaction tank, so that the biological flora in the wastewater is quickly established, various complex harmful ingredients in the wastewater are biodegraded, a special nutrient and an anti-surfactant matched with the special bacteria are simultaneously fed, the advantages and the activity of the special bacteria are maintained, the retention time is more than 12 hours, the temperature is controlled to be 25-30 ℃, and the gas-water ratio is controlled to be 30: 1, so as to improve the biochemical performance and the removal efficiency of the wastewater. After passing through the microbial reaction tank, most organic matters and oil in the wastewater are converted into CO through the metabolism of microbes2And H2And O, yielding water meets the discharge requirement.
(5) Adding water purifying agent (PAM, PAC) into the wastewater after biochemical treatment through a pipeline mixer, and then feeding the wastewater into a vertical sedimentation tank for sedimentation time of more than 1.5 hours to precipitate inorganic substances, residual sludge, partial biological sludge, bacterial metabolites and the like after biochemical degradation. And discharging the precipitated sludge into a sludge concentration tank through a No. 1 sludge discharge pump with the model of G42-1(II), and treating the supernatant into an acid-base wastewater adjusting tank.
2. The acid and alkali containing wastewater treatment step:
(1) the acid-base wastewater firstly enters an acid-base wastewater regulating tank, low-pressure air is introduced into the acid-base wastewater regulating tank through a Roots blower with the model of FT-125 and a perforated pipe made of ABS (acrylonitrile butadiene styrene) for pre-aeration, and then ferrous ions in the wastewater are oxidized into ferric ions to generate Fe (OH)3To facilitate precipitation. Pumping the acid-base wastewater into an acid-base primary neutralization tank and an acid-base secondary neutralization tank in sequence by an acid-base wastewater lifting pump with the model of G-32-65, and adding Ca (OH) into the acid-base primary neutralization tank and the acid-base secondary neutralization tank2Or concentrated H2SO4In order to adjust the PH value of the solution, PH on-line monitors are arranged in the acid-base primary neutralization tank and the acid-base secondary neutralization tank to accurately control the PH value of the solution.
(2) The wastewater enters an acid-base sedimentation tank, coagulation sedimentation is carried out by adding a biological coagulant and coagulant aid water purifying agent (PAM, PAC), the acid-base wastewater reaches the standard and is discharged, and the precipitated sludge is pumped to a sludge concentration tank by a 2# sludge pump with the model of G42-1.
3. Sludge treatment:
after sludge pumped from the vertical flow sedimentation tank and the acid-base sedimentation tank enters a sludge concentration tank and is subjected to gravity sedimentation and concentration for a period of time, the sludge is pumped into a plate-and-frame filter press with the specification of XMYZB30/800-U through a screw pump with the model of G42-1(II) to be subjected to sludge dehydration, the working temperature is less than or equal to 80 ℃, the water content of the dehydrated sludge is less than 75 percent, and dry sludge is taken as an iron-making raw material to be transported outside.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (7)
1. A recycling treatment method for cold rolling wastewater containing acid, alkali and thick oil is characterized by comprising the following steps:
1) treatment of concentrated oil wastewater
(1) Discharging concentrated oil wastewater in cold rolling wastewater into a concentrated oil wastewater storage tank, standing for layering, arranging a buoy oil scraper at the upper part of the concentrated oil wastewater storage tank, scraping floating oil into a floating oil tank by the buoy oil scraper,
(2) lifting the layered thick oil wastewater to a paper tape filter by a water pump to filter out partial impurities, then feeding the filtered thick oil wastewater into a circulating tank, and feeding the filtered thick oil wastewater into a circulating tank made of Al2O3Or an inorganic ceramic membrane ultrafiltration system of ZrO is used for oil-water separation, the floating oil overflows to a floating oil groove through an overflow groove and then enters an oil-water separation tank, 98 percent concentrated sulfuric acid is added and steam is introduced to further separate the oil from the water, the upper layer concentrated oil is recycled, the lower layer waste water enters an acid-base waste water regulating tank,
(3) the effluent of the ultrafiltration system enters a No. 1 intermediate water tank and is pumped to a first-stage PH regulating tank through a No. 1 intermediate water pump, the effluent of the first-stage PH regulating tank automatically flows to a second-stage PH regulating tank, and Ca (OH) is added into the two-stage PH regulating tanks2And concentrated H2SO4Adjusting the pH value, controlling the pH value of the wastewater to be 6.5-8.5 through two-stage pH value adjustment, enabling the wastewater to automatically flow into a No. 2 intermediate water tank,
(4) cooling the No. 2 intermediate water tank wastewater to 25-35 ℃ through a cooling tower, then feeding the wastewater into a microbial reaction tank, periodically feeding a 'doubly-fed' obligate combined flora into the microbial reaction tank through a bacterium feeding device, and simultaneously feeding an obligate nutrient agent and an anti-surfactant matched with obligate bacteria, so that the advantages and the activity of the obligate bacteria are maintained, the retention time is more than 12 hours, the temperature is controlled at 25-30 ℃, and the gas-water ratio is controlled at 30: 1, so as to improve the biochemical performance and the removal efficiency of the wastewater, and most of organic matters and oil in the wastewater are converted into CO through the metabolism of microorganisms after passing through a microbial reaction tank2And H2O, the effluent meets the discharge requirement,
(5) the wastewater after biochemical treatment enters a vertical flow sedimentation tank, sedimentation treatment is carried out by adding water purifying agent, the sedimentation time is more than 1.5 hours, the sedimentated sludge is discharged into a sludge concentration tank through a No. 1 sewage discharge pump, and the supernatant liquid is sent to an acid-base wastewater adjusting tank;
2) treatment of waste water containing acid and alkali
(1) The acid-base wastewater firstly enters an acid-base wastewater adjusting tank, is pre-aerated by introducing low-pressure air to prevent precipitation, and simultaneously, part of ferrous ions are oxidized into ferric ions to form Fe (OH) with thorough precipitation3The waste water is discharged into an acid-base primary neutralization tank and an acid-base secondary neutralization tank in turn by an acid-base waste water lift pump, and Ca (OH) is added into the acid-base neutralization tank2Or H2SO4The pH value of the solution is adjusted,
(2) the wastewater after acid-base neutralization treatment enters an acid-base sedimentation tank, coagulation sedimentation is carried out by adding a biological coagulant or coagulant aid water purifying agent, the acid-base wastewater reaches the standard and is discharged, and the precipitated sludge is pumped into a sludge concentration tank by a No. 2 sewage pump;
3) sludge treatment
Sludge generated by treating wastewater containing acid, alkali and thick oil enters a sludge concentration tank for sedimentation and concentration, the sludge is pumped into a plate-and-frame filter press by a screw pump for sludge dehydration, the water content of the dehydrated sludge is less than 75%, and dry sludge is taken as an iron-making raw material for outward transportation.
2. The recycling and treating method for the cold-rolled waste water containing acid, alkali and thick oil according to claim 1, wherein a liquid level detecting instrument is installed in the thick oil waste water storage tank in the step 1.
3. The recycling and treating method for the waste water containing acid, alkali and thick oil in the cold rolling process of claim 1, wherein the paper tape filter in the step 1 is provided with a frame, a motor is arranged on the frame, the motor drives a paper tape to move through a connected rolling shaft and filters part of impurities, and the motor is connected with a control system.
4. The recycling treatment method of the cold-rolled waste water containing acid, alkali and thick oil according to claim 1, characterized in that a liquid level meter, a heating coil and a temperature control device are arranged in the oil-water separation tank in the step 1.
5. The method for recycling and treating cold-rolled wastewater containing acid, alkali and thick oil according to claim 1, wherein an acid-alkali dosing stirring device and an online pH monitor are arranged in the first-stage pH adjusting tank and the second-stage pH adjusting tank in the step 1, and Ca (OH) is added into the two-stage pH adjusting tanks2Adopting a drug adding pump with model number BB50 to add H into the two-stage PH adjusting tank2SO4A sulfuric acid lift pump with the model number of 25FSB (L) -15 is adopted, the pH value of a primary pH adjusting tank is controlled to be 4-5, and the pH value of a secondary pH adjusting tank is controlled to be 6.5-8.5.
6. The recycling treatment method of cold-rolled wastewater containing acid, alkali and thick oil according to claim 1, characterized in that the microorganism reaction tank in step 1 is filled with semi-soft filler, the bottom layer is provided with a variable microporous aeration head and an aeration pipe, and a Roots blower is used for blowing aeration to prevent precipitation.
7. The method for recycling and treating cold-rolled waste water containing acid, alkali and thick oil according to claim 1, wherein the pre-aeration in step 2 is a Roots blower of FT-125 and a perforated pipe made of ABS, and low-pressure air is introduced into the acid-alkali waste water regulating tank for pre-aeration, and pH on-line monitors are arranged in both the acid-alkali primary neutralization tank and the acid-alkali secondary neutralization tank.
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