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Zero Discharge Technology of Wastewater-Opening the Era of Low Cost and Zero Discharge

KDSR Zero Emission Technology




Technical Introduction




KDSR Wastewater Zero Discharge Technology is a patented technology independently developed by Kaidi, which integrates high-efficiency softening and sedimentation, sludge drying, ultrafiltration, nanofiltration, reverse osmosis and evaporation crystallization. This technology can maximize the recycling of wastewater resources. The water yield of the system is over 90%, and the water quality reaches GB19923-2005.《 Standard of Industrial Water Quality for Urban Sewage Recycling and Utilization: Sodium chloride crystalline salt meets the first grade standard of industrial refined salt in GB 5462-2015 Industrial Salt Standard.




The main technical routes are as follows:




Technical characteristics




+ It has strong adaptability to water quality fluctuation and is suitable for wastewater with high salinity, high COD, high hardness and high ss.




+ High efficiency and low consumption pretreatment process can reduce 40% of the pharmaceutical cost.




+ High-precision special nanofiltration membrane salt separation technology is adopted to reduce the weight and ensure the purity of by-products. The special membrane has strong pollution resistance and long cleaning cycle.




+ The modular combination of the system is flexible and can meet different water quality and treatment requirements. The equipment is highly integrated, the film device and evaporation crystallization device are integrated and united, and occupy a small area.




key technology




1. KDSR L Pretreatment Softening Technology with High Efficiency and Low Consumption




KDSR l technology is a low-cost hard removal technology based on traditional lime-soda softening process. This technology can optimize the proportion of additives and recycle the residual active ingredients. It not only achieves high hardening performance, but also maximizes the use of expensive agents and reduces the operating cost of the system. 2. KDSR lI Sludge Reduction and Resource Utilization Technology




Zero Discharge Technology of Wastewater-Opening the Era of Low Cost and Zero Discharge




KDSR Zero Emission Technology




Sludge reduction: The desulfurized sludge belongs to inorganic sludge. By adding a certain proportion of sludge modifier, the sludge is conditioned to reduce the specific resistance of sludge, destroy the hard-to-dehydrate colloid and flocculent material, and make the desulfurized sludge form a mutually cemented whole, improve the dewatering performance, reduce the energy consumption of dewatering and reduce the outbound transportation. Purchase cost.




Sludge recycling: CaCO can be recovered as needed. It can be reused to desulfurization system to realize resource recycling.




Reduction effect: After the sludge was modified under the optimum operating conditions, the desulfurization sludge was reduced from 90% water content sludge to 50% water content sludge cake by plate-frame pressure filtration. Sludge can be reduced by 40%, which greatly reduces the cost of subsequent sludge treatment.




3. Zero-row Technology Route of Crystallization Products Resources




1) Technical route




application area




+ Zero Discharge Treatment Project of Desulfurization Wastewater in Coal-fired Power Plant:




+ Reverse osmosis concentrated water and ion exchange regeneration wastewater treatment:




+ Zero Discharge Treatment of High Salt Wastewater in Petrochemical, Metallurgical, Iron and Steel Industries.




Typical performance




Project Name: Zero Discharge Project of Desulfurization Wastewater from Chongqing Power Plant of Shenhua Guoneng Group Co., Ltd.




Unit Size: 2 x 660 b1W




Design inflow: 20m3/h




Designed water quality: TDS: 31520mg/L, Ca2lOOOOOmg/L, Mg2. 5000mg/L Cl 15000mg/L




Industrial route: two-stage reactive precipitation + ultrafiltration + nanofiltration + reverse osmosis + multi-effect evaporation (MED)




Performance Indicators: Water Quality Standard for Water Production: Water Quality Requirements for Process and Product Water in Urban Sewage Recycling and Utilization Industrial Water Quality (GB/T 19923-2005). Crystalline salt standard: Crystalline salt is NaCI. After drying, it meets the requirements of the first grade refined industrial salt in the Industrial Salt Standard (GB/T5462).




Contract time: March 2015