ADVANCED TREATMENT METHOD FOR BIOCHEMICAL TAIL WATER OF COKING WASTEWATER

摘要

The present invention discloses a method for advanced treatment of bio-treated coking wastewater, belonging to the field of advanced treatment and recycled use of wastewater. It adopts polymeric ferric sulfate (PFS) and polyacrylamide (PAM) as the flocculant for pre-treatment of bio-treated effluent. After the process of precipitation and filtration, the effluent is guided through an adsorption column filled with environmentally-friendly nano-composites whereby the advanced treatment of the bio-treated coking wastewater is achieved. When the absorption process reaches the breakthrough point, the adsorption operation will be stopped and sodium hydroxide solution is used as the desorption reagent for regenerating the nano-composites; the high-concentrated component of the desorption liquid is sent out for incineration or production of coal water slurry, meanwhile the low-concentrated component of the desorption liquid is used to prepare sodium hydroxid solution for the adsorption process of the next batch. The present invention features simple operating procedures and comparatively lower cost, and can be widely used in advanced treatment and comprehensive utilization of coking wastewater. It embodies not only significant environmental benefits but also promising market potential.