焦化废水回用转炉除尘的水质变化研究

研究了生化处理后焦化废水回用于转炉除尘水系统时CODCr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.

Study on the water quality changes of converter dust removal for recycling coking wastewater

Based on experimental simulating research, the effects of CODc, and temperature of coking wastewater treated in converter dust removal system on the pH value and alkalinity of water have been studied. The regulari ty of the recycled water quality changes has been revealed. The results show that the pH value and alkalinity of the treated coking wastewater tend to get lower and lower and the weak alkaline water changes into acidic 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 CODCr rate of the water is more than 100 mg/L, in the process of evaporation and concentration, at different constant temperature, its pH and alkalinity tend to get lower and lower continuously and the weak alkali water turns into acidic water. This is different from the changes happens to ordinary water,whose pH value and alkalinity tend to get higher and higher continuously. This discovery provides the coking wastewater recycling with evidence for follow-up treatment technique and for selecting water quality stabizers.