Improving Dewaterability and Other Properties of Citric Acid Wastewater Treatment Sludge by Ozone and Peroxone |
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| Authors: | Ning Ding Can Peng Hong Liu Yuxiao Ren Xiao Wang Ping Wang |
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| Affiliation: | 1. Key Laboratory of Cleaner Production and Comprehensive Utilization of Resources, China National Light Industry, Beijing Technology and Business University, Beijing, 100048, China;2. School of Material Science and Engineering, University of Science &3. Technology Beijing, Beijing, 100083, Chinadingning@btbu.edu.cn;5. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Jiangsu Province, 215000, China |
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| Abstract: | ABSTRACTThe efficacies of ozonation and peroxone (O3/H2O2) pretreatments were compared for citric acid wastewater sludge conditioning with the objective of improving dewatering characteristics of the sludge. Treatment with 84 mg O3/g dry solid (DS) and 12.5 mg/g DS H2O2 greatly enhanced the effectiveness of ozonation, providing sludge dewaterability similar to that obtained by ozonation at 250 mg O3/g DS. Most importantly, treatment of citric acid wastewater sludge with 84 mg O3/g DS and 12.5 mg/g DS H2O2 led to the preservation of the nutrient elements nitrogen, phosphorus, and potassium in the sludge with a minimal volatile suspended solids/total suspended solids reduction of 5.5%, which is much lower than that with ozonation at 250 mg O3/g DS. |
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| Keywords: | Ozone peroxone citric acid wastewater sludge extracellular polymeric substances dewaterability nutrient elements |
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