造纸法再造烟叶生产废水零排放关键技术应用研究

Research on the Application of Key Technology for Zero Discharge of Papermaking Reconstituted Tobacco Production Wastewater

为了实现造纸法再造烟叶生产废水零排放,开发出一套基于MBR+RO组合处理,氧化+吸附+絮凝、UF/NF脱盐,高盐浓液浓缩技术的废水处理回用系统。分析了废水处理各工艺段水质、排放达标情况、运行成本等。采用该技术实施改造后的某工程运行结果表明,MBR+RO出水(回用水)的水质较稳定,可以回用于生产车间;废水的SS、COD和p H值均满足《污水综合排放标准》(GB 8978-1996)一级标准。生产回用水水质达到《烟草工业用水卫生标准》(YC 444-2012);RO回用水多数指标达到《生活饮用水卫生标准》(GB 5749-2006)。改造后处理成本为6.42元/m^3,比改造前增加37.2%,但是通过净水回用,降低了清水使用量。改造后废水处理总量达到2 933 m3/d,比改造前增加11.1%;废水排放量为880 m3/d,比改造前降低66.7%;回用水达到2 120.6 m3/d,回用比例为72.3%;污泥产量为60 t/d,比改造前增加15.4%。

In order to achieve the zero discharge of paper-making reconstituted tobacco production wastewater,a wastewater treatment and reuse system was developed based on combined MBR and RO treatment,as well as oxidation, adsorption and flocculation, UF/NF desalination and high salt concentration technology. The water quality in wastewater treatment sections,discharge compliance,and operation costs were analyzed. The operation results showed that the quality of MBR and RO effluent( reused water) was stable and could be reused in the production workshop,the effluent SS,COD and pH met the first level A criteria of Integrated Wastewater Discharge Standard( GB 8978-1996),the quality of reclaimed water for production met Sanitary Requirements for Tobacco Industrial Water( YC444-2012),most reused water quality indexes of RO concentrated water met Standards for Drinking Water Quality( GB 5749-2006). The treatment cost after technical transformation is 6. 42 yuan/m^3,37. 2% higher than that before. However,through the reuse of purified water,the amount of clean water can be reduced. Compared with that before the technical transformation,the total daily wastewater treatment capacity reached 2 933 m^3/d with an increase of 11. 1%,and the daily discharge was 880 m^3/d with an decrease of 66. 7%. The reuse water reached 2 120. 6 m^3/d and the reuse ratio was72. 3%. 60 t/d of sludge was produced with an increase rate of 15. 4%.