Coking wastewater treatment

In response to the complex composition, high pollutant concentrations, recalcitrance, and high salinity of coking wastewater, a comprehensive treatment process combining biochemical treatment, membrane separation, and evaporation‑crystallization has been implemented to achieve true zero liquid discharge—enabling water reuse while recovering and valorizing sodium chloride and sodium sulfate from the salt fraction. The biochemical treatment employs an O‑A/O‑A/O process; membrane separation utilizes a UF‑RO1‑RO2 configuration for reclaimed water and a multi‑stage NF process for salt fractionation; and evaporation‑crystallization adopts triple‑effect evaporation coupled with cryogenic cooling and re‑crystallization for salt recovery. The biochemical system primarily removes the majority of COD, ammonia nitrogen, cyanide, and other pollutants, ensuring that effluent quality fully meets regulatory standards. The membrane separation stage focuses on water recovery, producing concentrated brine suitable for subsequent evaporation‑crystallization. Finally, the evaporation‑crystallization unit enables the resourceful utilization of sodium chloride and sodium sulfate while solidifying residual salts, thereby achieving true zero liquid discharge for coking wastewater. This integrated technology offers significant advantages, including stable operation, strong resistance to shock loads, high water‑recovery efficiency, consistent salt‑product quality, and genuine zero liquid discharge.

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Product Description

Technological Advantages

Technological Innovation:

A complete zero‑discharge technology system for coking wastewater has been developed: biochemical effluent is subjected to pre‑aeration followed by a two‑stage A/O process, ensuring stable compliance with all regulatory parameters; advanced pretreatment of reclaimed water combined with membrane separation maintains a high recovery rate while meeting reuse standards; further pretreatment of the concentrated brine from reclaimed water, coupled with composite nanofiltration membrane separation, maximizes the concentration of sodium chloride and sodium sulfate; finally, a three‑effect evaporation–freeze–recrystallization hybrid salt‑recovery process guarantees the quality of the final salt and nitrate products, enhances the yield of impurity‑laden salts, and truly achieves zero discharge of coking wastewater.

Key technologies: Pre-aeration of biochemical effluent combined with a two-stage A/O process; pretreatment of reclaimed‑water concentrate followed by composite nanofiltration membrane separation; and a three‑effect evaporation–freeze–recrystallization integrated salt‑recovery technology.

Product Description

Project Cases

Biochemical Treatment System

Middle Water Membrane System

Salt-splitting membrane system

Evaporation and crystallization

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Jiangsu Longye Energy-Saving Technology Co., Ltd.

Phone:0519-85258626

Email:longyetech@jslyjn.com

Address: No. 8, Hehuan South Road, Zhonglou District, Changzhou City, Jiangsu Province

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