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High-Performance SBR Operation by Optimized Feeding Method of External Carbon Source for Piggery Wastewater Treatment  

Jun, Byong-Hee (Institute for Environmental Technology and Industry, Pusan National University)
Poo, Kyung-Min (Department of Environmental Engineering, Pusan National University)
Choi, Eun-Hee (Department of Environmental Engineering, Pusan National University)
Lee, Hae-Il (Department of Environmental Engineering, Pusan National University)
Kim, Chang-Won (Department of Environmental Engineering, Pusan National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.24, no.11, 2002 , pp. 1957-1964 More about this Journal
Abstract
The effective feeding method of the external carbon source (ECS) to enhance denitrification in SBR based on the anoxic/aerobic sub-cycle for the piggery wastewater treatment was investigated. Generally, the wastewater quality of manure is strongly dependent on the collection, separation method and storage period. The wastewater discharged from scraper type barns is characterized by comparetively lower organic substrate concentration and readily biodegradable organic matter(Ss), then $NO_x-N$ becomes accumulated during the repeating sub-cycle operation. The maximum nitrogen removal rate was limited to 0.22 kg N/$m^3$/day under conventional sub-cycle operation using final step ECS feeding method. To overcome these limitation and achieve higher nitrogen removal rate, the ECS feeding method was changed from conventional final step feeding to every anoxic step feeding. When acetic acid was added in each anoxic step, sub-cycle numbers per one day were increased from five times to seven times. At the influent loading condition of over 0.22 kg N/$m^3$/day, the final step feeding caused the $NO_x-N$ accumulation and the removal loading rate was reduced. Adversely, in the case of every anoxic step (intermittent) feeding, the removal rate was increased to 0.45 kg N/$m^3$/day without $NO_x-N$ accumulation. Over these influent loading, the nitrification was not completed under given fixed time sequence, and ammonium ion was accumulated. From these results, it was found that every anoxic step (intermittent) feeding method could increase nitrogen removal efficiency largely. For the more high-performance of SBR, the control of nitrification end point and the control system is desired to optimize the external carbon feeding.
Keywords
Piggery Wastewater; SBR; External Carbon Source; Denitrification; Control System;
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