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55 technological processes

Process flow description

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Nitrogen in wastewater exists in the form of ammonia ion. The content of ammonia ion is 300 mg/L in design. According to the actual water quality, all or part of the equipment in the system can be activated to realize flexible operation. When the influent concentration is high, the nitrogen-containing wastewater in this process is first precipitated by reaction of magnesium ion and phosphate ion, and magnesium phosphate precipitation unit is added after MAP precipitation to precipitate excess magnesium phosphate, so as to protect the follow-up membrane system from being blocked by excessive magnesium ion and cause membrane system failure. MAP is a chemical precipitation method. When the influent concentration exceeds the design standard, the system can also be guaranteed by adding an increment of reagents.

 

Subsequently, excess magnesium and phosphate ions were removed by ultrafiltration reverse osmosis membrane, while some ammonia ions were isolated, and concentrated water was refluxed to the front section to continue the reaction. Sodium hypochlorite was added to the effluent of the membrane system to oxidize ammonia nitrogen with hypochlorite to further remove ammonia ions. In order to ensure that the effluent quality meets the requirement of zero discharge of nitrogen and phosphorus, the subsequent ion exchanger was used to check the effluent quality. Two sets of ion exchangers are arranged in parallel. When one set of resins is saturated for regeneration, it is switched to another set. In the process design of nitrogen-containing wastewater treatment, a certain insurance scheme was made. During the operation of the system, according to the actual water quality characteristics, some equipment in the system was activated. For example, ammonia ion content is less than 50 mg/L, SS less than 20 mg/L can be directly treated by reverse osmosis treatment system, chlorination reaction, ion exchange system to meet the discharge standards; or when the salt content of the system is less than 100 mg/L, SS less than 30 mg/L, the wastewater is directly precipitated by reaction, and goes beyond the membrane system, directly into the breakpoint chlorination system and ions. Switching system.

 

Ultrafiltration and reverse osmosis concentrated water are normally operated, and part of the concentrated water is returned to the nitrogen-containing wastewater to collect and reprecipitate. The concentration of phosphate and magnesium ion in concentrated water is high, which realizes the reuse of the reagent and reduces the operation cost. A part of the concentrated water flows back to the original tank to circulate inside the membrane system to reduce the load of the front sedimentation tank. When running for a period of time, the water salinity of the membrane system is high, and the water conductivity can be detected automatically. In order to ensure the stable operation of the membrane system, concentrated water is discharged into the tank for storage, and regularly transported through the concentrated water pump for distillation or incineration treatment.

Process flow description

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Fenton reaction process was used to treat organic wastewater. Organic wastewater was elevated from the workshop lifting pump to the sewage station collecting tank for temporary storage and water balance. The tank is equipped with a hydraulic mixing system. Afterwards, it was elevated to PH regulating pool 1, adjusted pH to 3-4 by adding HCl, and Fenton reaction was carried out by adding ferrous salt and hydrogen peroxide in turn. After Fenton reaction, the effluent flows into the PH regulating tank 2. Coagulant and flocculant are added to the tank for coagulation reaction. After that, sludge is separated by inclined pipe sedimentation, and the effluent flows into the drainage tank to meet the discharge standards.

Process flow description

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Cyanide-containing wastewater is elevated from the workshop lifting pump to the collection tank of the sewage station for temporary storage and water balance. The catchment pool uses the original pool and a mixer is installed in the pool for mixing. After that, it is elevated to the PH regulating tank of cyanide-containing wastewater by lifting pump, and adjusted pH to 10-11 by NaOH. It enters the first-order cyanide-breaking reaction tank. After the first-order cyanide-breaking reaction and the hydrochloric acid to adjust pH to 6.5-7, it enters the second-order cyanide-breaking reaction tank. The ORP value is monitored synchronously during the process of cyanide-breaking to ensure that the cyanide- At the end of the cyanide treatment unit, cyanide on-line monitoring is set up to discharge from the discharge pool, and the excess reflux is processed when it approaches the excess standard.

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Shanghai Shanghaojia Process

Process flow description

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The system water flows into the grid well by itself, removes the large impurities such as bottle caps and plastic bags through mechanical grids, and then rises to the hydraulic sieve through the pump to remove some large suspended pollutants. The wastewater flows into the catchment pool 2, then rises to the initial sedimentation pool through the pump, adds liquid alkali to regulate PH, the metering pump and PH online monitoring chain, and adds PAC, PAC, PH. PAM, removing micro-particle suspended matter; clarifying effluent from primary clarifier flowing into air flotation machine, removing oil by adding demulsifier and bubbles flotation; self-flowing wastewater flowing into regulating tank, homogenizing and evenly lifting to hydrolysis tank, improving biodegradability of wastewater, transforming macromolecular organic matter into small molecules; effluent flowing into activated sludge tank and entering into activated sludge tank; Aerobic biodegradation was carried out to remove organic matter, and then the wastewater was discharged up to the standard after sludge water separation in the secondary sedimentation tank.

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