造纸废水回用系统稳定性的优化与改进

Optimization and Improvement of Stability on the Papermaking Wastewater Reuse System

关键词:  造纸废水  双膜回用  改进

Key Words:papermaking wastewater  double-membrane reuse  improvement

摘要:对某企业二期中水回用系统进行改进。将原生化处理系统（A/O）改为两级处理，降低生化出水的污染物浓度，稳定出水COD_Cr约100 mg/L。同时将原低浓度直排管网废水进行再利用，经A/O池2次处理后也作为二期超滤系统的进水水源之一。一期原Fenton工艺及二期中水预处理均改为活性炭粉末吸附工艺。研究表明，一期系统优化及新建二期系统的设备投资费用约1220万元，土建投资约907万元，实际运行成本（除人工）约2.45元/t水。

Abstract:The second-phase reclaimed water reuse system of the enterprise was improved. The original biochemical treatment system （A/O） was transformed to two-stage treatment to reduce the concentration of pollutants in the biochemical effluent and stabilize the COD_Cr of effluent at about 100 mg/L. The waste water from original low-concentration direct-draining pipe network was reused， which was used as one of the influent water sources of the second-stage ultrafiltration system after A/O treatment for twice. The original Fenton process in the first phase and the pretreatment of reclaimed water in the second phase were improved to the activated carbon powder adsorption process. The results showed that the equipment investment cost of optimization of the first phase system and new construction of the second phase system was about ¥12.2 million， civil construction cost of which was about ¥9.07 million， and the actual operating cost （excluding labor costs） of which was about ¥2.45/t.