摘要：

以山东某燃煤电厂脱硫废水改造项目为背景，采用一体式高效澄清工艺替换原有三联箱工艺，处理SS高达13 650 mg/L、COD_Cr为350 mg/L、重金属离子浓度超标的脱硫废水。处理前，先通过实验室小试确定基础加药量，缩小调试期间加药量范围；然后通过现场设备调试，优化运行参数，降低设备损坏率。经168 h的调试运行，新型脱硫废水处理系统运行稳定，污染物去除效果良好，出水SS在1.5 mg/L，COD_Cr在132.2 mg/L，总铅、总镉、总汞、总铬、总锌分别在0.14、0.01、0.01、1.04、1.24 mg/L，出水水质满足《火电厂石灰石-石膏湿法脱硫废水水质控制指标》（DL/T 997—2020）要求。与电厂原三联箱工艺相比，一体式高效澄清工艺不仅对水质有明显提升，而且年运行费用由100多万元降低至50多万元，经济效益显著。

关键词: 燃煤电厂, 脱硫废水, 一体式高效澄清装置, 调试

Abstract:

In a desulfurization wastewater renovation project of a coal-fired power plant in Shandong Province, the original triple-tank process was replaced by integrated high efficiency clarification process to treat the desulfurization wastewater, with suspended solids of 13 650 mg/L, COD_Cr of 350 mg/L and heavy metal ion concentration exceeding the standard. The basic chemical dosage could be determined by laboratory test. By on-site equipment joint adjustment, the operating parameters could be optimized and equipment damage rate could be reduced. After 168 h commissioning and running, the new process of desulfurization wastewater system was stable and effective. The effluent SS was 1.5 mg/L, COD_Cr was 132.2 mg/L, total lead, total cadmium, total mercury, total chromium, and total zinc were 0.14, 0.01, 0.01, 1.04, and 1.24 mg/L, respectively. The effluent quality could meet the relevant indicators of the Discharge Standard of Wastewater from Limestone-Gypsum Flue Gas Desulfurization System in Fossil Fuel Power Plants (DL/T 997-2020). Compared with the original triple-tank process in power plants, the integrated high-efficiency clarification process not only significantly improved water quality, but also reduced annual operating costs from over 1 million yuan to over 0.5 million yuan, with significant economic effects.

Key words: coal-fired power plant, desulfurization wastewater, integrated high efficiency clarification equipment, commissioning

中图分类号: 

• TM621.8