LIUKui.Engineering Application of Fractionation Pretreatment and Advanced Treatment for Fluoride-containing Wastewater in Coal Chemical Industry[J].China Water & Wastewater,2025,41(16):103-107.
煤化工含氟废水的分质预处理+深度处理工程实践
- Title:
- Engineering Application of Fractionation Pretreatment and Advanced Treatment for Fluoride-containing Wastewater in Coal Chemical Industry
- Keywords:
- fractionation pretreatment; advanced treatment; coal chemical industry; fluoride?containing wastewater
- 摘要:
- 河南某大型煤化工企业位于地下水高氟区，生产废水含氟量较高。因地处淮河流域，当地环保要求较严。该企业根据不同废水含氟量采取分质处理方式。对于煤气化废水（氟化物为30～45 mg/L），采用投加钙盐和除氟剂的二级混凝沉淀处理工艺，出水氟化物浓度≤3 mg/L后，进入后续处理工段；对于循环排污水（氟化物浓度为3～5 mg/L），采用混凝气浮+砂滤处理工艺，出水氟化物浓度≤1.5 mg/L后，进入后续处理工段。上述废水和其他废水一起通过活性氧化铝吸附罐进行深度处理，出水氟化物浓度≤1 mg/L。由4年多的运行实践可知，该除氟设施运行基本稳定，总排口氟化物在线监测月均值为0.49～1.07 mg/L（总均值为0.83 mg/L），满足环保要求。
- Abstract:
- A large-scale coal chemical enterprise located in eastern Henan Province is situated in a high-fluoride groundwater area, where some of the production wastewater contains high fluoride concentrations. The region is part of the Huaihe River basin and has stringent environmental protection requirements. To address different fluoride concentrations in wastewater, the enterprise adopts fractionation pretreatment methods. The fluoride concentration in coal gasification ash wastewater is relatively high at 30-45 mg/L. It is treated using a two-step coagulation-precipitation process with calcium salt and defluorinating agents, resulting in an effluent fluoride concentration less than 3 mg/L, which is then subjected to subsequent treatment processes. The fluoride concentration in circulating water discharge ranges from 3 to 5 mg/L, and it is treated using coagulation-flocculation and sand filtration processes, achieving an effluent fluoride concentration less than 1.5 mg/L, which enters the subsequent treatment section. The aforementioned wastewater, together with other wastewater, undergoes advanced treatment using an activated alumina adsorption tank, resulting in an effluent fluoride concentration less than 1 mg/L. After more than four years of operation, the average monthly fluoride concentration at the total discharge outlet ranges from 0.49 mg/L to 1.07 mg/L (with a total mean value of 0.83 mg/L). The defluorination facilities operate steadily and meet the environmental requirements.
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