摘要
为逐步实现脱硫废水零排放处理目标,广东某电厂建设投运一套脱硫废水预处理工艺系统,该系统采用“双碱软化+管式超滤”处理工艺,处理后废水可直接进入后续全厂废水零排处理系统。对脱硫废水预处理系统运行性能进行监测分析,结果显示:双碱软化工艺参数控制较差,主要表现为pH控制不稳定和纯碱加药量不合理,管式超滤浓缩倍率远远不够。通过双碱法软化参数优化试验,结果表明:pH在10.90以上、纯碱加药比达1.1时,出水水质即可满足后续全厂废水零排处理系统进水要求。通过物料平衡分析,管式超滤工艺单元中进水流量、排泥流量和产水流量依次应为9 m^(3)/h、2 m^(3)/h、7 m^(3)/h,可以最大限度地提高浓缩倍率。经过运行性能监测分析和优化研究,提高了脱硫废水预处理系统运行效率,降低了运行成本。
In order to realize the zero-discharge treatment of desulfurization wastewater gradually,a set of desulfurization wastewater pretreatment process system is built and put into operation in a power plant in Guangdong province,which adopts the“double alkali softening+tubular ultrafiltration”treatment process and after treatment,the wastewater can directly enter into the subsequent zero-discharge treatment system of the whole plant.The operation performance of desulfurization wastewater pretreatment system is monitored and analyzed,and the results show that the control of the process parameters of double alkali softening is poor,mainly manifested as unstable pH control and unreasonable dosage of soda ash,and the concentration rate of tubular ultrafiltration is far from sufficient.The softening parameters are optimized by double alkali method and the experimental results show that when the pH is above 10.90 and the alkali ash dosing ratio reaches 1.1,the effluent quality can meet the subsequent water intake requirements of the whole plant wastewater zero-discharge treatment system.Through material balance analysis,the inlet flow rate,sludge discharge flow rate and water production flow in the tubular ultrafiltration process unit should be about 9 m^(3)/h,2 m^(3)/h and 7 m^(3)/h respectively to maximize the concentration ratio.After operation performance monitoring analysis and optimization study,the operation efficiency of desulfurization wastewater pretreatment system is improved,and the operation cost is reduced.
作者
周永强
郑观文
曹顺安
ZHOU Yongqiang;ZHENG Guanwen;CAO Shunan(Zhanjiang Power Co.,Ltd.,Zhanjiang,Guangdong 524099,China;Wuhan University,Wuhan,Hubei 430072,China)
出处
《山西电力》
2024年第1期65-68,共4页
Shanxi Electric Power
关键词
脱硫废水
双碱软化
管式超滤
desulfurization wastewater
double alkali softening
tubular ultrafiltration
