加酸法治理燃煤电厂外排冲灰水pH超标的研究

RESEARCH ON APPLYING SULFURIC ACID TO TREAT ASH SLUICING DRAINAGE WITH HIGH PH

燃煤电厂的冲渣废水呈碱性,直接外排污染环境。本研究以镇海发电厂为试验点,利用附近有废硫酸的有利条件,进行加酸法治理外排冲灰水pH超标的工业试验。加酸点确定为距厂区4.7km处的输灰管上,加酸量为0.102L/m3,经治理后的冲灰水的水质达到污水综合排放二级标准,并使管道结垢减轻。该工艺可行,技术成熟,为其它燃煤发电厂治理废水pH超标提供了实践依据。

The ash sluicing water discharged from coal firing power station is alkaline,and will pollute the surroundings if discharged directly. This research discusses a treatment of ash sluicing drainage with high pH carried out in Zhenhai power plant. The research takes advantage of waste sulfuric near to the plant and uses it as the acid in treatment of the ash sluicing water. The site where the acid is introduced is determined at ash transportation duct of 4.7km apart from plant, with 0. 102L/m^3 acid being added. The effluent water quality after treatment reaches the second degree of integrated wastewater discharge standard, and furthermore, the treatment abates scale building up in the duct. This technology is mature and feasible, can provide practical experience for other coal-firing power plant in treatment ash sluicing draining water with pH higher than the requirement of standard.