兰炭废水汽提蒸氨工艺的氨氮深度处理  

Advanced treatment of ammonia-nitrogen in orchid carbon wastewater by optimization of stripping ammonia distillation process

作　　者：陈晓东 晏荣山 胡建波 任国瑜[1,2] CHEN Xiao-dong;YAN Rong-shan;HU Jian-bo;REN Guo-yu(College of Chemistry and Chemical Engineering,Yulin University,Yulin 719000,Shaanxi Province,China;Shaanxi Key Laboratory of Clean Utilization of Low-Metamorphic Coal,Yulin 719000,Shaanxi Province,China)

机构地区：[1]榆林学院化学与化工学院,陕西榆林719000 [2]陕西省低变质煤洁净利用重点实验室,陕西榆林719000

出　　处：《化学工程》2021年第9期64-68,78,共6页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(21968036);陕西省科技资源开放共享平台项目(2019PT-18);榆林学院博士科研启动基金(18GK27)。

摘　　要：针对兰炭废水难处理和以生化处理为核心的废水处理工艺成本超高的问题,提出汽提蒸氨和次氯酸钠氧化法耦合达到氨氮深度处理目的,利用正交试验法为工艺耦合考察工艺参数。结果显示:以汽提蒸氨后氨氮质量浓度为100 mg/L的废水为处理目标,最优条件为反应温度45℃,pH值7,鼓气速度5 mL/min,次氯酸钠添加量50 g/L,处理后的水中剩余氨氮质量浓度为2.4 mg/L,去除率达到97.5%,满足熄焦水要求。经过耦合后的处理工艺操作路线短,运行简单,处理过的废水可二次利用,实现准零排放。处理每t废水的运行成本约33.55元/t,副产品氮气和氨水可实现47.5元/t产值,去除运行成本,可获13.95元/t净利润,同时还可以节省大量外购新鲜水,可为废水资源化利用和实现零排放提供一个新思路。In view of the difficult treatment of orchid carbon wastewater and the high cost of the wastewater treatment process with biochemical treatment as the core,it was proposed that the stripping ammonia distillation process and sodium hypochlorite oxidation process of orchid carbon wastewater could be coupled to achieve the advanced treatment of ammonia nitrogen.The orthogonal experimental method was used to investigate the process parameters of ammonia nitrogen deep removal for the process coupling.The results show that the optimal conditions are the reaction temperature 45℃,pH=7,gas speed 5 mL/min,sodium hypochlorite dosage 50 g/L,and the residual ammonia nitrogen mass concertration of the treated water is 2.4 mg/L.The removal rate reaches 97.5%,which meets the requirement of coke quenching water.The coupling treatment process has short operation route and simple operation,and the treated wastewater can be reused and can achieve quasi-zero discharge.The estimated operation cost of treating wastewater was about 33.55 yuan/t,and the by-product nitrogen and ammonia can achieve 47.5 yuan/t output value.Removing the operation cost,the net profit 13.95 yuan/t can be obtained.At the same time,a large amount of purchased fresh water can be saved.The research can provide a new idea for the resource utilization and zero discharge of wastewater in blue carbon enterprises.

关 键 词：兰炭废水 汽提蒸氨法 次氯酸钠氧化法 工艺耦合 

分 类 号：TQ523.53[化学工程—煤化学工程]