湿法脱硫论文：燃煤电厂湿法烟气脱硫系统节水及废水处理技术研究.docVIP

湿法脱硫论文：燃煤电厂湿法烟气脱硫系统节水及废水处理技术研究 【中文摘要】本文以石灰石-石膏湿法脱硫（WFGD）装置的水系统为研究对象,首先对湿法脱硫系统进行用水和耗水的分析计算,并对脱硫系统的水平衡测试进行分析,进一步提出节水措施。然后针对WFGD系统的脱硫废水的水质特点提出物化-生物处理方法,并进行试验研究。物化方法中选用聚合硫酸铝铁（PAFS）为混凝剂,PAFS去除悬浮物的效率在99%以上,然后采用正交试验确定PAFS对硫化物、氟化物及COD的最佳去除效果下的试验条件:pH值为89,PAFS投加量7.5ml/l,PAM投加量1ml/l,混凝搅拌时间20min,沉降时间20min。最佳试验条件下处理效果为:混凝处理后硫化物含量0.845 mgl/1,去除率95.88%;氟化物含量8.74 mgl/1,去除率93.87%;COD含量115.19 mgl/1,去除率62.93%。生化方法中向脱硫废水中投加电厂生活污水使其具有可生化性,投加比例控制在40%45%,Cl-浓度控制在6000 mg/l左右。采用正交试验确定SBR反应器处理化学处理后脱硫废水的最佳运行参数为:厌氧时间0.5h,曝气时间为8h,缺氧时间4h,沉淀时间1h,曝气量0.2 m3/h,MLSS 2000 mg/L。在最佳工况下SBR对废水中COD、NH4+-N、NO3--N的去除率分别达到91.60%,89.23%和63.90%。最终出水COD的浓度为73.41 mg/L,硝酸盐氮的浓度为9.34mg/L,氨氮的浓度为7.19 mg/L,出水浓度达到GB8978-1998《污水综合排放标准》要求。 【英文摘要】Taking water system of limestone-gypsum Wet Flue Gas Desulfurization （WFGD） device as object of study, First, this paper carries on the analysis and computation to the used water and the consumed water of WFGD system, and carries on the analysis to the water balance test of WFGD, further proposes the saving water measures. Then in view of the water quality characteristic of desulfurization wastewater the paper proposes the materialized-biological treatment method, and conducts the experimental study. In the materialized method selecting polymerization sulfuric acid ferro-aluminum （PAFS） as the coagulant, the suspension’s elimination efficiency by PAFS is above 99%. Then using the orthogonal experiments determine PAFS best text condition under remove of the sulfide, the fluoride and the COD by PAFS: the pH value 89, PAFS throwing content 7.5ml/l, PAM throwing content 1ml/l, coagulation mixing time 20min, settling time 20min. Under the best test condition the treatment effect : after coagulation processing, sulfide content 0.845 mgl/1, elimination rate 95.88%; Fluoride content 8.74 mgl/1, elimination rate 93.87%; COD content 115.19 mgl/1, elimination rate 62.93%. In the biochemistry method the desulfurization wastewater throwed the domestic sewage in power plant is enable to bioche