This paper centres on the mechanism of wastewater treatment technology for viscose fibre production, in-volving the removal of sulphide (S2-), zinc(Zn2+), and organic substances( CODer), and meanwhile, de-termines the...This paper centres on the mechanism of wastewater treatment technology for viscose fibre production, in-volving the removal of sulphide (S2-), zinc(Zn2+), and organic substances( CODer), and meanwhile, de-termines the optimal strategy for wastewater treatment of Shanghai No. 1 Chemical Fibre Factory. Hydrosul-phuric acid is a weak acid, and in a certain range of pH value(pH 【 8 .18) the concentration of free S2- is below 1 mg/1. The H2S gas can be removed by intro-ducing compressed air. Actually, when pH 【 3, the concentration of sulphide in wastewater can meet the discharge standard. As to zinc (Zn2+), owing to its amphiprotic nature, it can be precipitated completely while pH value is within 8.24-10.5 . With the com-bined method of oxidation and coagulation, the average removal of CODer reaches 81.37% , and the concentra-tion of CODer In the effluent is about 50mg/1 under the best conditions: both the concentrations of oxidant and coagulant are about 60 ppm and the pH is 7 .展开更多
文摘This paper centres on the mechanism of wastewater treatment technology for viscose fibre production, in-volving the removal of sulphide (S2-), zinc(Zn2+), and organic substances( CODer), and meanwhile, de-termines the optimal strategy for wastewater treatment of Shanghai No. 1 Chemical Fibre Factory. Hydrosul-phuric acid is a weak acid, and in a certain range of pH value(pH 【 8 .18) the concentration of free S2- is below 1 mg/1. The H2S gas can be removed by intro-ducing compressed air. Actually, when pH 【 3, the concentration of sulphide in wastewater can meet the discharge standard. As to zinc (Zn2+), owing to its amphiprotic nature, it can be precipitated completely while pH value is within 8.24-10.5 . With the com-bined method of oxidation and coagulation, the average removal of CODer reaches 81.37% , and the concentra-tion of CODer In the effluent is about 50mg/1 under the best conditions: both the concentrations of oxidant and coagulant are about 60 ppm and the pH is 7 .
