活性焦吸附过滤技术用于造纸废水处理提标改造

Application of Active Coke Adsorption Filtration Technology in Upgrading Papermaking Wastewater Treatment

浙江某造纸废水处理工程设计规模为2×10^(4)m^(3)/d,现需将设计出水水质从《城镇污水处理厂污染物排放标准》(GB 18918—2002)的二级标准提升为一级A标准。通过技术经济比选,在臭氧高级氧化、芬顿高级氧化、活性焦吸附过滤(ACCA)等几种工艺中选择了更具综合优势的ACCA工艺作为提标改造主体工艺。设计选用两级ACCA系统,每一级均由26座直径3 m的反应器构成,吸附过滤出水接入现状消毒池。运行中投加新焦约4.50 t/d,同时排出对应数量的废焦,每日需翻洗活性焦滤料1次。设计选用1座砂滤池,将活性焦吸附过滤系统翻焦过程及完成后30 min内的系统出水接入砂滤池,经过滤后排出。经实际运行验证,ACCA工艺可以实现对造纸废水的稳定达标处理,滤床板结、含焦废水排水管堵塞等问题均得到有效解决。

The design effluent quality of a papermaking wastewater treatment project with design capacity of 2×10^(4)m^(3)/d in Zhejiang,needs to be upgraded from levelⅡcriteria to first level A criteria in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002).Through technical and economic comparison,activated coke continuous adsorption(ACCA)filtration process is selected as the main process of upgrading and transformation due to its more comprehensive advantages among several processes such as ozone advanced oxidation,Fenton advanced oxidation and ACCA.The designed two-stage ACCA system is composed of 26 reactors with a diameter of 3 m for each stage,and the adsorption filtered water is connected to the current disinfection tank.During operation,about 4.50 t/d o new coke is added,and the corresponding amount of waste coke is discharged.The active coke filter material needs to be washed once a day.The ACCA system effluent during coke turning process and within 30 minutes after its completion are connected to a designed sand filter and discharged after filtration.Through operation verification,ACCA process can achieve stable and up to standard treatment of papermaking wastewater,and the problems of filter bed hardening and coke containing wastewater drainage pipe blockage are solved.