CN114573143A - Mixing station wastewater purification treatment method - Google Patents
Mixing station wastewater purification treatment method Download PDFInfo
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- CN114573143A CN114573143A CN202210246637.3A CN202210246637A CN114573143A CN 114573143 A CN114573143 A CN 114573143A CN 202210246637 A CN202210246637 A CN 202210246637A CN 114573143 A CN114573143 A CN 114573143A
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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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
- 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
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to the technical field of sewage treatment, in particular to a mixing station wastewater purification treatment method, which comprises the following steps: s1, sand separation: the concrete tank truck is provided with water at a designated position by a system, after the tank truck is flushed, the water is discharged into a water receiving hopper, the mixture enters a sand-stone separator, the material is flushed by high-speed water flow and is sent into a rotary screen for sand-stone separation; s2, filtering: pumping the primary filtrate subjected to sand-stone separation treatment into a filter press by using a pump for filtering to obtain a filter cake and secondary filtrate; s3, neutralization: introducing the secondary filtrate obtained after filtration into integrated equipment, and adding organic acid to adjust the pH value of the filtrate; s4, solid-liquid separation: carrying out solid-liquid separation by integrated equipment to further obtain bottom sediment and third filtrate; and S5, discharging the liquid to a clean water tank to reach the third-level standard of the sewage comprehensive discharge industry. The invention realizes multi-port treatment, has high resource reuse rate, avoids waste and pollution of sand and stone materials, completely treats the discharged water to reach the standard, and is suitable for various complex construction site environments.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a mixing station wastewater purification treatment method.
Background
The source of the waste water of the concrete mixing station is mainly generated by cleaning a stirrer, a transportation tank car, a pump truck, a mixing station site and the like. The substances in the waste water of the mixing plant mainly come from raw materials of mixed concrete, and fine cement, fly ash particles and hydration product particles of the cement and the fly ash particles are contained; fine aggregate particles and clay or sludge particles carried by the aggregate; soluble inorganic salts, additive ions, sulfates, sulfides, etc. brought in by cement, additives, antifreeze, expanding agent, etc. (
Na+、K+、
And OH-Etc.) and the solid content is always in an unstable state, tests and statistical analysis show that the solid content in the wastewater is about 6-10%, and the pH value of the wastewater is>12, be strong basicity, if direct discharge, not only cause the waste of resource wherein, handle simultaneously not comprehensive, SS, pH, COD sewage management and control main index can not reach standard simultaneously, can not reach discharge standard, can cause serious pollution for the natural environment, so it is necessary to discharge, retrieval and utilization after handling it.
The existing technology or process only aims at SS and sensory water quality (water body clarity) treatment, ignores pH and CDO, and can cause salinization and hardening of soil, underground water and surface water, such as water body alkalization, dissolved oxygen reduction, water body ecology damage, water quality deterioration and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a comprehensive mixing station wastewater purification treatment method.
The purpose of the invention is realized by the following technical scheme:
the mixing station wastewater purification treatment method comprises the following steps:
s1, sand separation: the concrete tank truck is provided with a designated position by the system for receiving water, after the tank truck is flushed, the water enters a water receiving hopper, the mixture enters a sand-stone separator, the material is flushed by high-speed water flow and sent to a rotary screen for sand-stone separation, and primary filtrate is obtained;
s2, filtering: pumping the primary filtrate subjected to sand-stone separation treatment into a filter press by using a pump for filtering to obtain a filter cake and secondary filtrate;
s3, neutralization: introducing the secondary filtrate obtained after filtration into integrated equipment, adding organic acid into the integrated equipment to adjust the pH value of the filtrate until the pH value of the secondary filtrate is adjusted to 6.5-8.0, and reacting for 10-20 min;
s4, solid-liquid separation: adding PAC and APAM into a multistage sedimentation tank of integrated equipment, arranging a stirring pump in the multistage sedimentation tank, flocculating and settling mixed liquor after fully and uniformly mixing, settling secondary filtrate subjected to acid-base neutralization, and performing solid-liquid separation to further obtain bottom sediment and tertiary filtrate;
s5, discharging the liquid to a clean water tank, and after the detection is qualified, achieving the three-level standard of the sewage comprehensive discharge industry: the pH value is 6.5-8.0, COD is 25-39mg/l, and SS is 10-61 mg/l.
Further, in step S1, the sand pile and the stone-like material separated by sand and stone are respectively shoveled and transported for reuse.
Furthermore, the wastewater is pumped into a filter press by a pump, and the filter press is a plate and frame filter press.
Further, the organic acid is oxalic acid dihydrate (other organic acids such as citric acid, tartaric acid, malic acid, etc. can be used, and the dosage is adjusted according to the field water quality, acid radical ratio, etc.), and the general value is 0.1-0.3 g/L.
Further, the solid-liquid separation comprises the following specific steps: introducing sewage into a water inlet tank of the integrated device, passing through an oil separation tank and then entering a regulating tank, adding PAC and APAM flocculating and precipitating mixed liquor into the regulating tank through an external dosing metering pump for treatment, fully mixing the sewage and a medicament in the regulating tank under the action of a stirrer, fully precipitating in a multistage sedimentation tank respectively until sufficient hydraulic retention time is reached, fully separating sediment, suspended matters and precipitation substances generated by reaction from raw water, discharging into a reflux tank through a blowdown valve, and finally discharging clear water from a water outlet tank for direct discharge or recycling.
Further, the dosage of the PAC is 50-100mg/L, and the dosage of the APAM is 0.5-2.5 mg/L.
Further, the multistage sedimentation tank comprises at least one vertical flow sedimentation tank, an inclined tube sedimentation tank and a horizontal flow sedimentation tank.
Furthermore, when the filter press reaches the preset pressure of 0.4-0.8Mpa (adjusted according to the field mud condition), the plate frame automatically releases pressure, and under the action of an automatic travelling crane, the mud plates are separated from the filter press platform and stacked on a lower-layer platform to wait for being cleared and transported to a mud plate pit.
The invention has the following advantages:
1. the invention starts to treat the tank truck wastewater from the mixing wastewater source and can also pump water from the reservoir, thereby realizing the multi-port treatment effect.
2. The resource recycling efficiency is high, and the waste and pollution of sand and stone materials are avoided.
3. Most of the existing market equipment is not adjusted in pH value, and the mixing station sewage can be completely treated to reach the standard and reach the discharge standard.
4. Avoids the problems of difficult storage, pungent odor and difficult transportation and use of inorganic acids such as sulfuric acid, hydrochloric acid, nitric acid and the like.
5. The integrated equipment occupies a small area, is simple and convenient to install and simple to transport, can be suitable for adjusting the corresponding position and is suitable for construction site environments with complex conditions.
6. The design of the equipment is standardized, the hydraulic retention time is sufficient, and the impurity removal effect is obvious. The PAC, APAM and acid dosing scheme is proved to be safe, effective, trace and efficient through multiple experiments.
Drawings
FIG. 1 is a first process flow diagram of the present invention.
FIG. 2 is a second process flow diagram of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following.
As shown in figure 1, the mixing station wastewater purification treatment method is characterized in that: the method comprises the following steps:
s1, sand separation: the concrete tank truck is assigned a designated position by the system (using limit measures such as infrared and catch wheel rods), and after the concrete tank truck is in place, the system is started by one key to automatically collect water (1.5 m)32-3min), flushing the tank car, discharging water into a water receiving hopper, feeding the mixture into a sand-stone separator, flushing the mixture with high-speed water flow, feeding the mixture into a rotary screen for sand-stone separation, respectively carrying and recycling the sand pile and the stone mill after the sand-stone separation, and feeding primary filtrate into a reservoir for treatment;
s2, filtering: pumping the primary filtrate subjected to sand-stone separation treatment into a filter press for filtering, pressing the filter press with a plate-and-frame filter press under the drive of a motor and a hydraulic oil cylinder to obtain a filter cake and secondary filtrate, allowing the secondary filtrate to enter a reflux pool along a PVC pipe for treatment, automatically relieving pressure of the plate-and-frame filter press when the pressure of the filter press reaches a preset pressure of 0.4-0.8Mpa (regulated according to the field slurry condition), separating mud plates from the filter press platform under the action of an automatic travelling crane, accumulating the mud plates on a lower-layer platform, and waiting for being transported to a mud plate pit;
s3, neutralization: introducing the secondary filtrate obtained after filtration into integrated equipment, adding organic acid into the integrated equipment to adjust the pH value of the filtrate until the pH value of the secondary filtrate is adjusted to 6.5-8.0, and reacting for 10-20 min;
s4, solid-liquid separation: adding PAC (polyaluminium chloride) and APAM (polyacrylamide) flocculation precipitation mixed liquid into a multistage sedimentation tank of the integrated equipment, feeding the mixed liquid into a stirring pump of an adjusting tank, fully stirring and uniformly mixing the mixed liquid, and sequentially flowing through a vertical flow sedimentation tank, an inclined tube sedimentation tank and a horizontal flow sedimentation tank for full sedimentation. Carrying out sedimentation treatment on the secondary filtrate subjected to acid-base neutralization, and carrying out solid-liquid separation to further obtain a bottom precipitate and a tertiary filtrate;
s5, discharging the liquid to a clean water tank, and after the detection is qualified, achieving the three-level standard of the sewage comprehensive discharge industry: the pH value is 6.5-8.0, the COD is 25-39mg/l, and the SS is 10-61 mg/l.
Furthermore, the filter press is a plate-and-frame filter press, through holes are formed in corners of the filter frame and the filter plate, and a complete channel is formed after assembly, and suspension, washing water and filtrate can be introduced. The suspension is pressed into the filter chamber by the feed pump, forming a filter residue on the filter cloth until the filter chamber is filled. The clear filtrate passes through the filter cloth and flows to the corner channel of the plate frame along the groove of the filter plate, is discharged from the centralized PVC pipe and flows back to the reflux pool.
Further, the organic acid is oxalic acid dihydrate (other organic acids such as citric acid, tartaric acid, malic acid, etc. can be used, and the dosage is adjusted according to the field water quality, acid radical ratio, etc.), and the general value is 0.1-0.3 g/L.
Further, the solid-liquid separation comprises the following specific steps: introducing sewage into a water inlet tank of the integrated device, passing through an oil separation tank and then entering a regulating tank, adding PAC and APAM flocculating and precipitating mixed liquor into the regulating tank through an external dosing metering pump for treatment, fully mixing the sewage and a medicament in the regulating tank under the action of a stirrer, fully precipitating in a multistage sedimentation tank respectively until sufficient hydraulic retention time is reached, fully separating sediment, suspended matters and precipitation substances generated by reaction from raw water, discharging into a reflux tank through a blowdown valve, and finally discharging clear water from a water outlet tank for direct discharge or recycling.
Further, the dosage of the PAC is 50-100mg/L, and the dosage of the APAM is 0.5-2.5 mg/L.
Furthermore, the multistage sedimentation tank comprises at least one vertical flow sedimentation tank, an inclined tube sedimentation tank and a horizontal flow sedimentation tank.
This device has designed special medicine system, and PAC dissolves in the clear water in 1# adds the medicine bucket, and oxalic acid dihydrate dissolves in the clear water (according to the concrete pH adjusting quantity of sewage) in 2# adds the medicine bucket, fully dissolves under the effect that adds the medicine agitator, then the agent dosage is added in the strict control of rethread measuring pump to satisfy the processing requirement and be the standard.
As shown in figure 1, the device can also be provided with a No. 3 medicine adding barrel, and APAM is added, and the dosage is 0.5-2.5 mg/L.
As shown in figure 2, the device can also be externally provided with a circular reservoir, and is internally provided with a stirring mechanism, wherein the 1# dosing barrel, the 2# dosing barrel and the 3# dosing barrel are communicated with the device, and the liquid medicine is added into the circular reservoir for stirring, so that the effect is better.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The mixing station wastewater purification treatment method is characterized by comprising the following steps: the method comprises the following steps:
s1, sand separation: the concrete tank truck is provided with a designated position by the system for receiving water, after the tank truck is flushed, the water enters a water receiving hopper, the mixture enters a sand-stone separator, the material is flushed by high-speed water flow and sent to a rotary screen for sand-stone separation, and primary filtrate is obtained;
s2, filtering: pumping the primary filtrate subjected to sand-stone separation treatment into a filter press by using a pump for filtering to obtain a filter cake and secondary filtrate;
s3, neutralization: introducing the secondary filtrate obtained after filtration into integrated equipment, adding organic acid into the integrated equipment to adjust the pH value of the filtrate until the pH value of the secondary filtrate is adjusted to 6.5-8.0, and reacting for 10-20 min;
s4, solid-liquid separation: adding PAC and APAM into a multistage sedimentation tank of integrated equipment, arranging a stirring pump in the multistage sedimentation tank, flocculating and settling mixed liquor after fully and uniformly mixing, settling secondary filtrate subjected to acid-base neutralization, and performing solid-liquid separation to further obtain bottom sediment and tertiary filtrate;
s5, discharging the liquid to a clean water tank, and after the detection is qualified, achieving the three-level standard of the sewage comprehensive discharge industry: the pH value is 6.5-8.0, the COD is 25-39mg/l, and the SS is 12-61 mg/l.
2. The mixing station wastewater purification treatment method according to claim 1, characterized in that: in step S1, the sand pile and the stone-like hammer after sand-stone separation are respectively shoveled and transported for reuse.
3. The mixing station wastewater purification treatment method according to claim 1, characterized in that: in step S2, the wastewater is pumped into a filter press, which is a plate and frame filter press.
4. The mixing station wastewater purification treatment method according to claim 1, characterized in that: in step S3, the organic acid is oxalic acid dihydrate 0.1-0.3 g/L.
5. The mixing station wastewater purification treatment method according to claim 1, characterized in that: in step S4, the solid-liquid separation specifically includes: introducing sewage into a water inlet tank of the integrated device, passing through an oil separation tank, then entering into an adjusting tank, adding PAC and APAM flocculating and precipitating mixed liquor into the adjusting tank through an external dosing metering pump for treatment, then fully mixing the sewage and medicament in the adjusting tank under the action of a stirring pump, and fully precipitating in a multistage sedimentation tank respectively, wherein the settling time is 30-60min, so that sediment, suspended matters and precipitation substances generated by reaction are fully separated from raw water, and the sewage is discharged into a reflux tank through a blow-down valve, and finally, clear water is discharged from a water outlet tank and is directly discharged or recycled.
6. The mixing station wastewater purification treatment method according to claim 1, characterized in that: in step S4, the PAC is used in an amount of 50-100mg/L, and the APAM is used in an amount of 0.5-2.5 mg/L.
7. The mixing station wastewater purification treatment method according to claim 1, characterized in that: the multistage sedimentation tank comprises at least one vertical flow sedimentation tank, an inclined tube sedimentation tank and a horizontal flow sedimentation tank.
8. The mixing station wastewater purification treatment method according to claim 1, characterized in that: in step S2, when the pressure of the filter press reaches the preset pressure of 0.4-0.8Mpa, the plate frame automatically releases pressure, and the mud plate is separated from the platform of the filter press and stacked on the lower platform under the action of the automatic crane to wait for being cleared to a mud plate pit.
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| CN202210246637.3A CN114573143A (en) | 2022-03-14 | 2022-03-14 | Mixing station wastewater purification treatment method |
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| CN110776136A (en) * | 2019-10-28 | 2020-02-11 | 中国石油大学(北京) | Pretreatment method for process wastewater generated in preparation of long-chain dicarboxylic acid by biological fermentation method |
| CN112028341A (en) * | 2020-09-25 | 2020-12-04 | 中国电建集团北京勘测设计研究院有限公司 | Grit material production wastewater treatment system and wastewater treatment method |
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2022
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| US5660733A (en) * | 1995-04-10 | 1997-08-26 | Deskins; Franklin David | Sewage dewatering process |
| JP2002052387A (en) * | 1999-05-27 | 2002-02-19 | Sanyo Electric Co Ltd | Wastewater filtering method |
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| CN107445347A (en) * | 2017-09-20 | 2017-12-08 | 苏州爱源环境科技有限公司 | The processing system and processing method of a kind of phosphorus-containing wastewater |
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| CN110092503A (en) * | 2019-05-15 | 2019-08-06 | 广州超邦化工有限公司 | Pyrophosphate-citric acid systems corronil electroplating wastewater processing method |
| CN110776136A (en) * | 2019-10-28 | 2020-02-11 | 中国石油大学(北京) | Pretreatment method for process wastewater generated in preparation of long-chain dicarboxylic acid by biological fermentation method |
| CN112028341A (en) * | 2020-09-25 | 2020-12-04 | 中国电建集团北京勘测设计研究院有限公司 | Grit material production wastewater treatment system and wastewater treatment method |
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Application publication date: 20220603 |