膜生物反应器(MBR)处理干法腈纶废水

针对干法腈纶废水污染物种类多且难以生物降解的特点，以及抚顺石油化工公司腈纶化工厂废水处理工艺脱氮效果差、出水ρ(COD_Cr)高的现状，采用填料式缺氧-好氧膜生物反应器(MBR)工艺处理干法腈纶废水，考察该技术对干法腈纶废水COD_Cr，NH₄+-N和TN的去除率，以及处理效果的稳定性. 结果表明:MBR处理干法腈纶废水的出水水质稳定，对进水水质、水量的变化有较强的耐冲击性；采用缺氧-好氧工艺不仅可去除97%以上的NH₄+-N，还可去除60%以上的TN；但是由于干法腈纶废水可生化性差，且ρ(NH₄+-N)高，缺氧段反硝化作用及好氧段硝化作用存在缺少碳源和碱度的现象. 

Wastewater Treatment of Dry-Spun Acrylic Fiber by Membrane Bioreactor

Dry-spun acrylic fiber wastewater is a kind of recalcitrant wastewater with a variety of pollutants. At present, the acrylic fiber wastewater treatment processes applied in the Acrylic Fiber Plant of Fushun Petrochemical Corporation have several drawbacks, such as low nitrogen removal efficiency and high concentration of COD_Cr in the effluent. In this study, the membrane bioreactor (MBR) with packed type A/O process was applied in the treatment of dry-spun acrylic fiber wastewater. The removal efficiencies of COD_Cr, ammonia-nitrogen and total nitrogen in the treatment of dry-spun acrylic fiber wastewater by MBR and the stability of the reactor were investigated. The results indicated that the MBR technique had high resistance to shock loading of water quantity and water quality, and the water quality of the effluent was stable. The ammonia-nitrogen and total nitrogen removal rates could reach above 97% and 60% by A/O process. However, denitrification in the anoxic zone and nitrification in the oxic zone were limited by the deficiency of alkalinity and carbon sources due to bad biodegradability of dry-spun acrylic fiber wastewater and high concentration of ammonia-nitrogen.