摘要：

研究了生化处理后焦化废水回用于转炉除尘水系统时COD_Cr和温度对水的pH和碱度的影响作用，揭示了回用水水质变化的规律。研究表明焦化废水处理水随着蒸发浓缩作用的进程，pH和碱度持续地呈降值变化趋势，由弱碱性水转化为酸性水。在实验设置温度范围内恒温温度的增高对pH的降值速率的变化影响不大，但对碱度降值速率变化的影响比pH的明显要大；焦化废水处理水在此工况下pH和碱度的变化趋势异于普通水在蒸发浓缩进程中pH和碱度均持续地呈增高变化的情况。该研究结果为焦化废水回用的后续技术处理，筛选水质稳定药剂配方提供了依据。

关键词: 焦化废水, 转炉除尘, 回用, 水质变化

Abstract:

Based on experimental simulating research, the effects of COD_Cr and temperature of coking wastewater treated in converter dust removal systemon the pH value and alkalinityofwater have been studied. The regularity of the recycled water quality changes has been revealed. The results showthat the pH value and alkalinity of the treated cokingwastewater tend toget lower and lower and the weak alkaline water changes intoacidic water. In the process of evaporation and concentration. In the range of established temperature, the increasing of constant temperature does not have much influence on the changes of decreasing rate of pH value, but more obvious influence on changes of decreasing rate of alkalinity, than on pH value. The recycled coking wasteater or when the COD_Cr rate of the water is more than 100 mg/L, in the process of evaporation and concentration, at different constant temperature, its pH and alkalinitytend toget lower and lower continuouslyand the weak alkali water turns intoacidic water. This is different from the changes happens to ordinary water, whose pH value and alkalinity tend to get higher and higher continuously. This discoveryprovides the cokingwastewater recyclingwith evidence for follow-up treatment technique and for selectingwater qualitystabizers.

Key words: coking wastewater, converter dust removal, recycling, water quality changes

中图分类号: 

• TQ085