Treatment process and engineering cases for the risk and quantity reduction of laboratory liquid waste
MIAO Shiyu1,2,, MAO Zhengang1,,, LIU Ruiping1,3, HU Jiukun4 1.Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 2.University of Chinese Academy of Sciences, Beijing 100049, China 3.Center for Water and Ecology, School of Environment, Tsinghua University, Beijing 100084, China 4.Dajiang Environment Co. Ltd., Nanjing 210019, China
Abstract:The risk and quantity reduction treatment of laboratory liquid waste is of crucial importance to control the lab environmental risks, alleviate the capacity shortage for hazardous waste disposal and decrease the disposal cost. This study carefully investigated the water quality characteristics of the laboratory liquid waste, and put forward the feasible treatment process to reduce the liquid waste amount and to minimize the environmental risks as much as possible. To achieve this goal, the laboratory liquid wastes are proposed to be separately pretreated according to their characters, then these classified liquid wastes are treated by secondary unit processes such as metals decomplexation and chemical precipitation. Finally, adsorption is used as the tertiary treatment process to achieve the Integrated Wastewater Discharge Standard for the effluents to urban drainage. Results of field investigation indicated that the concentrations of class-I pollutants such as Hg, Cr, and Pb were lower than those in industrial hazardous liquid waste, which can be treated by the proposed treatment process to meet the corresponding standards. The final effluents may be either discharged directly into the municipal drainage systems or be discharged into the community-level wastewater treatment station for further purification and reclamation. This process may reduce the amount of laboratory liquid wastes by 40%~90% and the cost by 85% as compared to be disposed by the third-party companies for hazardous wastes disposal. The process and its application cases provide reference for the disposal of the laboratory liquid wastes in research institutes, universities, and the Science Parks and so on. Key words:laboratory liquid wastes/ reduction of liquid wastes amount/ environmental risks control/ class-I pollutants/ engineering cases.
图1实验室废液与社区污水联合处理系统 Figure1.Schematic of laboratory liquid waste treatment and community-level sewage treatment systems
LOU J C, CHANG C K. Completely treating heavy metal laboratory waste liquid by an improved ferrite process[J]. Separation and Purification Technology, 2007, 57(3): 513-518. doi: 10.1016/j.seppur.2006.11.005
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LUNA P B F G D, ALBUQUERQUE P M, SILVA C C, et al. Treatment of liquid waste produced in a small chemical laboratory using the photo-Fenton process[J]. Journal of Food Agriculture & Environment, 2013, 11(1): 1125-1128.
1.Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 2.University of Chinese Academy of Sciences, Beijing 100049, China 3.Center for Water and Ecology, School of Environment, Tsinghua University, Beijing 100084, China 4.Dajiang Environment Co. Ltd., Nanjing 210019, China Received Date: 2020-01-22 Accepted Date: 2020-04-21 Available Online: 2020-07-10 Keywords:laboratory liquid wastes/ reduction of liquid wastes amount/ environmental risks control/ class-I pollutants/ engineering cases Abstract:The risk and quantity reduction treatment of laboratory liquid waste is of crucial importance to control the lab environmental risks, alleviate the capacity shortage for hazardous waste disposal and decrease the disposal cost. This study carefully investigated the water quality characteristics of the laboratory liquid waste, and put forward the feasible treatment process to reduce the liquid waste amount and to minimize the environmental risks as much as possible. To achieve this goal, the laboratory liquid wastes are proposed to be separately pretreated according to their characters, then these classified liquid wastes are treated by secondary unit processes such as metals decomplexation and chemical precipitation. Finally, adsorption is used as the tertiary treatment process to achieve the Integrated Wastewater Discharge Standard for the effluents to urban drainage. Results of field investigation indicated that the concentrations of class-I pollutants such as Hg, Cr, and Pb were lower than those in industrial hazardous liquid waste, which can be treated by the proposed treatment process to meet the corresponding standards. The final effluents may be either discharged directly into the municipal drainage systems or be discharged into the community-level wastewater treatment station for further purification and reclamation. This process may reduce the amount of laboratory liquid wastes by 40%~90% and the cost by 85% as compared to be disposed by the third-party companies for hazardous wastes disposal. The process and its application cases provide reference for the disposal of the laboratory liquid wastes in research institutes, universities, and the Science Parks and so on.