东江水源和本地水库水源原水混用的给水厂运行实践

Operation Practice of Mixing Raw Water from Dongjiang River and Local Reservoir in a Waterworks

针对深圳地区东江原水和本地水库的原水酸碱性及浊度存在差异的情况,某水厂通过总结多年原水混用经验,制定科学系统的混用方案及相关工程改造措施,解决了双水源水质差异对水厂运行管理及药剂投加带来的问题。实践表明,在东江支线水源和本地水库水源混合比例为4∶6~5∶5时,可有效改善双水源水质pH值和浊度差异问题,通过稳定原水水质进一步提升出厂水水质稳定性,使平均出水pH值由改造前的7.28~7.68稳定为7.43~7.57,平均出水浊度由改造前的0.11~0.21 NTU稳定为0.10~0.12 NTU。此外,该工程措施缓解了水厂运行管理压力,同时使PAC、石灰和盐酸的投加量分别降低22.3%、57.7%和100%,药剂成本同比下降26.1%。可见,该水厂应对水质差异显著的双水源问题的措施科学可行且成效显著,可为同行提供借鉴。

According to the difference of acidity,alkalinity and turbidity between raw water from Dongjiang and local reservoirs,based on years of experiences in a waterworks,a scientific and systematic scheme of mixed use and related engineering transformation measures were also formulated to solve the problems caused by water quality differences between the two sources.The practical results showed that with mixing ratio of Dongjiang branch and local reservoir water source of 4∶6-5∶5,the pH and turbidity difference of two sources water quality can be effectively improved.By stabilizing the raw water quality,the stability of effluent quality is further improved.The average effluent pH value is stabilized from 7.28-7.68 to 7.43-7.57 and the average effluent turbidity was stable from 0.11-0.21 to0.10-0.12 NTU.Besides,the dosage of PAC,lime and hydrochloric acid decreased significantly by22.3%,57.7%and 100%respectively,and the pharmacy cost increased by 26.1%compared with the previous year.The above results show that the measures taken by the waterworks to deal with the"double water source"problem of significant difference in water quality are scientific,feasible and effective,which may provide relevant technical reference for peers.