粘胶纤维生产废水处理技术及其机理探讨

对粘胶纤维生产中废水处理技术的机理进行了初步研究,探索其去除硫化物(S~=)、锌(Zn~++)及有机物的机理;同时确定实际废水处理各步工艺的最佳运行条件。理论上,氢硫酸在一定pH值范围(<8.18时,游离S~=浓度低于1mg/l,H_2S气体用曝气方法脱除。实际上上海第一化学纤维厂废水需控制pH值小于3时处理,其中硫化物(S~=)才达到排放标准。除锌机理为利用锌的两性性质,控制pH值范围为8.24～10.5,以保证废水中锌离子得以沉淀完全;实际废水情况与此基本相符。有机物的去除,采用氧化混凝复合方法,控制最佳运行条件:0(氧)型氧化剂与混凝剂(以Al_2O_3计)投量均为60ppm,pH值为7,平均COD_(cr)去除率可达81.37％,出水COD_(cr)值为50mg/l左右。

MECHANISM RESEARCH OF VISCOSE FIBRE PRODUCTION WASTEWATER TREATMENT TECHNOLOGY

This paper centres on mechanism research of viscose fibre production wastcwater treatment technology, including the removal of sulphide (S=), zinc (Zn++), and organical substances (CODcr). Meanwhile determines the most suitable operation conditions on actual wastewater of Shanghai Chemical Fibre Factory No. 1. Hydrosulphuric acid is a weak acid, in a range of pH value (pH<8.18) the concentration of free S= is under 1 mg/ 1, the gas H2S can be removed by introducing compressed air. In actual, only when the pH<3, the sulphide (S = )in wastewater cam meet the discharge standard. About zinc(Zn++), with its amphiprotic nature, command the pH limits within 8.24-10.5, the precipitation of zinc ion is almost completed. By the combined method of oxidation and coagulation, the average removal of CODcr reaches 81.37%, the effluent's CODcr is sbout 50 mg/ 1, under the best condition: the comcentration of O-oxidant and coagulant is 60 ppm respectively, the pH value is 7.