厌氧反硫化沉淀法预处理高硫有机废水试验研究

Experimental study on pretreatment to high sulfate and organic wastewater with method of anaerobic reverse-sulfide and precipitation

在水解酸化反应器中经过四个阶段水力负荷提升,对最终接近实际废水水质条件(CODCr浓度为9 300 mg/L,当量有机硫化物浓度534 mg/L)的高硫有机废水进行了厌氧生化处理,获得了CODCr容积负荷为11 kg/(m^3·d)的运行能力,硫化物对厌氧微生物的抑制浓度为400 mg/L,有机硫化物反硫化率达到80%,CODCr去除率达到54%.利用沉淀法去除硫化物,考察了沉淀剂加入量、搅拌速度、初始p H值对硫化物去除效果的影响,确定了除硫工艺条件为初始p H=7.5,n(Fe^(2+))∶n(S^(2-))=1.1的FeCl_2·4H_2O投加量,80 r/min的搅拌速度下搅拌30 min,此条件下硫化物去除率可达81%.

After four stages of the hydraulic loading being lifted,high sulfur and organic wastewater approached the actual water quality conditions（ CODcrconcentration = 9 300 mg/L,equivalent organic sulfides concentration = 534 mg / L） and was anaerobic biological treated through the hydrolysis acidification reactor. Finally,CODCrloading rate reached 11 kg /（ m^3·d） and obtained the conclusions of sulfide inhibition concentration400 mg/L,organic sulfide reverse-sulfide rate reaching 80% and CODCrremoval rate reaching 54%. In order to remove sulfides by process of precipitation respectively the effects of the amount of precipitation agent added,stirring speed and the initial p H on the removal of sulfides were investigated. Finally,the optimum conditions were determined as initial p H = 7. 5,FeCl_2·4H_2O adding amount of n（Fe^（2＋）） ∶n（S^（2-）） = 1. 1 and stirring speed of 80 r/min for 30 min with sulfide removal rate reached 81%.