Kai Yang1,2, Jianwei Yu1,2, Qingyuan Guo1,3, Chunmiao Wang1,2, Ping Xia4, Y Jeffrey Yang5, Min Yang1,2. 1. Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Beijing 100085, China. 2. University of the Chinese Academy of Sciences, Beijing 100019, China. 3. Yancheng Institute of Technology, Yancheng 224051, China. 4. Shanghai National Engineering Research Center of Urban Water Resources Co., Ltd., Shanghai 200082, China. 5. US Environmental Protection Agency, Office of Research and Development, Cincinnati, OH 45286, USA.
Abstract
BACKGROUND: To improve the microbial safety of drinking water, an arrangement of O3-BAC with rear sand filtration (O3-BAC-sand) has been proposed. In this study, efforts were devoted to evaluate the benefits and drawbacks of O3-BAC-sand in a full-scale water treatment plant. The performance of the two configurations was compared in terms of particles, turbidity, CODMn and typical odorants and pesticides. RESULTS: The O3-BAC-sand yielded lower turbidity but higher CODMn (by approximately 7%) in the finished water than regular O3-BAC (sand-O3-BAC). Both systems removed odors in raw water; however, sand-O3-BAC was more effective on septic and musty odorants. The total pesticide removals by sand-O3-BAC and O3-BAC-sand were 78% and 72%, respectively; though the latter had shorter activated carbon durable years. CONCLUSION: The re-location of the sand filter would sacrifice the BAC efficiency in removals of organic matter and micropollutants. This tradeoff is a result of the loss of the particulate organic matter removal by sand filters, because locating the sand filter behind BAC causes particle load increase on BAC; some measures of enhanced coagulation should be suggested to improve the turbidity and particle removal. The study will be helpful for improvement of the O3-BAC process in drinking water treatment.
BACKGROUND: To improve the microbial safety of drinking water, an arrangement of O3-BAC with rear sand filtration (O3-BAC-sand) has been proposed. In this study, efforts were devoted to evaluate the benefits and drawbacks of O3-BAC-sand in a full-scale water treatment plant. The performance of the two configurations was compared in terms of particles, turbidity, CODMn and typical odorants and pesticides. RESULTS: The O3-BAC-sand yielded lower turbidity but higher CODMn (by approximately 7%) in the finished water than regular O3-BAC (sand-O3-BAC). Both systems removed odors in raw water; however, sand-O3-BAC was more effective on septic and musty odorants. The total pesticide removals by sand-O3-BAC and O3-BAC-sand were 78% and 72%, respectively; though the latter had shorter activated carbon durable years. CONCLUSION: The re-location of the sand filter would sacrifice the BAC efficiency in removals of organic matter and micropollutants. This tradeoff is a result of the loss of the particulate organic matter removal by sand filters, because locating the sand filter behind BAC causes particle load increase on BAC; some measures of enhanced coagulation should be suggested to improve the turbidity and particle removal. The study will be helpful for improvement of the O3-BAC process in drinking water treatment.
Entities:
Keywords:
Drinking water treatment; O3–BAC–sand; Sand filter interception; Sand–O3–BAC
Authors: Selene Maria de Arruda Guelli Ulson de Souza; Karin Angela Santos Bonilla; Antônio Augusto Ulson de Souza Journal: J Hazard Mater Date: 2010-02-24 Impact factor: 10.588