TONGZhen-gong,CHENZhe-wei,ZHANGTong-tong,et al.Chemical Stability of Water Quality before and after Reflux of Production Wastewater in Waterworks[J].China Water & Wastewater,2025,41(17):84-89.
给水厂生产废水回流前后水质化学稳定性分析
- Title:
- Chemical Stability of Water Quality before and after Reflux of Production Wastewater in Waterworks
- Keywords:
- waterworks; reflux of production wastewater; chemical stability of water quality; source water of Nanchang section of the Ganjiang River
- 摘要:
- 针对夏季赣江南昌段水源水，采用饱和指数等指标综合分析区域水质化学稳定性。同时，基于赣江沿岸两座给水厂，研究生产废水回流至常规处理工艺中对水质化学稳定性的影响。结果表明，夏季赣江南昌段水源水具有腐蚀倾向，其饱和指数<0，稳定指数>7.5，拉森指数>0.2，侵蚀指数介于9~11，碳酸钙沉淀势<-5 mg/L。与无生产废水回流时的出厂水相比，当回流10%生产废水时，出厂水饱和指数降低8.59%，稳定指数上升0.39%，拉森指数上升10.53%，侵蚀指数下降1.49%，碳酸钙沉淀势下降6.74%。通过相关性分析可知，pH、碱度、硬度和腐蚀性阴离子（Cl-、SO42-、HCO3-）是回流生产废水后影响水质化学稳定性的主要因素。进一步的方差分析揭示，处理工艺和生产废水回流比均会对化学稳定性定量指标产生影响，且随回流比的增加，水质化学稳定性降低。给水厂生产性试验证明，回流生产废水会降低水质化学稳定性，增大出厂水的腐蚀风险。
- Abstract:
- The chemical stability of source water quality in Nanchang section of the Ganjiang River during summer season was systematically evaluated using parameters such as saturation index. Additionally, based on data from two waterworks along the Ganjiang River, the influence of the reflux of production wastewater into conventional treatment process on the chemical stability of the water quality was investigated. During summer, the source water of Nanchang section of the Ganjiang River exhibited a tendency towards corrosion, characterized by the saturation index below 0, the stability index exceeding 7.5, the Larsen index greater than 0.2, the erosion index ranging from 9 to 11, and the calcium carbonate precipitation potential lower than -5 mg/L. Compared with the effluent without production wastewater reflux, when 10% of production wastewater was recirculated, the saturation index of the effluent decreased by 8.59%, the stability index increased by 0.39%, the Larsen index increased by 10.53%, the erosion index decreased by 1.49%, and the calcium carbonate precipitation potential decreased by 6.74%. Through correlation analysis, it could be determined that pH, alkalinity, hardness, and corrosive anions (Cl-, SO42-, HCO3-) were the primary factors influencing the chemical stability of water quality after reflux of production wastewater. Further analysis of variance indicated that both treatment process and the reflux ratio of production wastewater exerted measurable effects on quantitative stability indicators. Specifically, as the reflux ratio increased, the chemical stability of the treated water decreased. Full?scale trials at the waterworks confirmed that the reflux of production wastewater compromised the chemical stability of the effluent, thereby increasing its risk of corrosion.
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