Optimization of loading flocculation pretreatment of produced water from “three gases” co-mining using response surface methodology
LIU Yanping1,, RAO Yufeng1, LAN Miao1, LIU Xinchun2, JU Liting3, JU Yiwen3,, 1.Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China 2.College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China 3.Key Laboratory of Computational Geodynamics, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:In order to improve the produced water quality from “three gas” co-mining in coal measures, response surface method was used to study and optimize the effect of loading flocculation pretreatment. Through the Box-Behnken test design, PFS dosage, APAM dosage and sludge return flow were chosen as the main influencing factors, and COD removal rate was taken as the response index to establish the relevant mathematical model, then the optimization analysis and test verification of the model was conducted. The results showed that the quadratic polynomial mathematical model based on the experimental data was highly significant(P<0.000 1), with R2=0.987. Good fitting occurred between the experimental data and predicted data. The optimal process conditions were PFS dosage of 28.88 mg·L?1, APAM dosage of 9.96 mg·L?1 and reflux sludge of 239.5 mg·L?1. Under these conditions, the predicted value of COD removal rate was 37.32%, the measured value was 37.41%, with the deviation of 0.09% between them. Zeta potential decreased to ?4.08 mV. After the system treatment, the effluent can meet the reuse standard for irrigation of relevant dry farmland, it is of great significance for the resource utilization of the produced water. Key words:“three gas” co-mining in coal measures/ produced water/ response surface methodology/ COD removal rate/ loading flocculation.
图1水质帕博三线图 Figure1.Piper three-line diagram of water quality
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1.Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China 2.College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China 3.Key Laboratory of Computational Geodynamics, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China Received Date: 2020-03-30 Accepted Date: 2020-06-23 Available Online: 2021-01-13 Keywords:“three gas” co-mining in coal measures/ produced water/ response surface methodology/ COD removal rate/ loading flocculation Abstract:In order to improve the produced water quality from “three gas” co-mining in coal measures, response surface method was used to study and optimize the effect of loading flocculation pretreatment. Through the Box-Behnken test design, PFS dosage, APAM dosage and sludge return flow were chosen as the main influencing factors, and COD removal rate was taken as the response index to establish the relevant mathematical model, then the optimization analysis and test verification of the model was conducted. The results showed that the quadratic polynomial mathematical model based on the experimental data was highly significant(P<0.000 1), with R2=0.987. Good fitting occurred between the experimental data and predicted data. The optimal process conditions were PFS dosage of 28.88 mg·L?1, APAM dosage of 9.96 mg·L?1 and reflux sludge of 239.5 mg·L?1. Under these conditions, the predicted value of COD removal rate was 37.32%, the measured value was 37.41%, with the deviation of 0.09% between them. Zeta potential decreased to ?4.08 mV. After the system treatment, the effluent can meet the reuse standard for irrigation of relevant dry farmland, it is of great significance for the resource utilization of the produced water.
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