燃煤电厂脱硫废水预处理装置设计与中试研究

针对火电厂脱硫废水的水质特点，提出“一体式软化澄清-超滤”预处理工艺并在山东某火力发电厂进行了中试研究，研究内容包括一体式软化澄清装置对Ca²⁺、Mg²⁺、浊度去除效果，超滤系统运行压力、产水流量、产水浊度及预处理工艺化学药剂费用等。结果表明：利用一体式软化澄清装置处理脱硫废水，出水Ca²⁺、Mg²⁺质量浓度可分别由400~660 mg/L和5 310~15 689 mg/L降至25 mg/L和10 mg/L，浊度小于或等于2.0 NTU；超滤系统运行稳定，产水浊度小于或等于0.1 NTU，SDI值小于3.0，可稳定达到后续反渗透系统进水水质要求。该一体式软化澄清-超滤预处理工艺中试研究成果可为火电厂废水零排放技术研究提供重要的基础数据。

Pretreatment Device Design and Pilot Application of Desulfurization Wastewater in Coal-Fired Power Plants

According to the characteristics of desulfurization wastewater in the coal-fired power plant, the desulfurization wastewater pretreatment method of the integrated softening and clarifying-ultrafiltration is proposed in this paper. The pilot project testing is completed in a coal-fired power plant in Shandong province. The study includes the removal efficiency of integrated softening and clarifying on Ca²⁺, Mg²⁺ and the turbidity, the operating pressure of the ultrafiltration system, the flow and turbidity of the product water, and the chemical cost of the pretreatment process. The results show that the content of Ca²⁺ decreases from 400~660 mg/L to 25 mg/L and the content of Mg²⁺ decreases from 5 310~15 689 mg/L to 10 mg/L after the treatment of desulphurization wastewater by integrated softening and clarifying-ultrafiltration, respectively, with the turbidity being no more than 2.0 NTU. The ultrafiltration system operates stably and the turbidity of product water is no more than 0.1 NTU, SDI value is less than 3.0, which can meet the required water quality conditions of the reverse osmosis system. The study results of the integrated softening and clarifying-ultrafiltration can provided important data for the research on the zero wastewater discharge technology in the power plant.