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Title: A research on the performance of down-flow hanging sponge (DHS) reactor in treating domestic wastewater
Authors: Nguyen, Trung Hiep
Le, Thi Tuyet
Dinh, Thi Nga
Phan, Dinh Tuan
Keywords: Down-flow Hanging Sponge (DHS) system
Domestic wastewater
Organic loading rate
Removal efficiency
Issue Date: 2018
Series/Report no.: Vietnam Journal of Science and Technology;Vol.56(04) .- P.482–492
Abstract: The aim of this study was to evaluate the performance of a down-flow hanging sponge (DHS) system in treating domestic wastewater. A pilot-scale of DHS system with a capacity of 60 L was designed and fabricate from polyvinyl chloride (PVC). The dimensions of DHS system are 1.5 m in height and square surface with 0.2 m in width, consists of three identical segments connected vertically in series. Each segment was filled by polyurethane sphere containing sponge. The total area of sponge and polyurethane sphere was 3,300 m2 m-3, density at 150 kg m-3, void ratio at 90%. DHS system was operated at ambient temperature within 82 days and stepwise increased of organic f rate from 0.5 to 1 and 1.5 kg COD m-3 d-1. The results showed that this system performed well throughout the operational period and achieve the maximum removal of COD, BOD5, NH4+-N, and TN as 80 %, 83 %, 65 % and 60%. The effluent of wastewater from DHS system achieved the requirement for National technical regulation on domestic wastewater of Vietnam type B QCVN 14:2008/BTNMT. In conclusion, the performance of DHS system indicated a high potential for application in removing organic matter and converting nitrogen ammonia to nitrogen nitrate, however it did not perform well for the removal of total nitrogen, it is necessary to study further by providing an anoxic zone in the system to enhance the treatment of nutrient in wastewater.
ISSN: 2525-2518
Appears in Collections:Vietnam journal of science and technology

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