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Piggery Waste Treatment using Improved MLE Process in Full-Scale  

Hwang, In-Su (Office of Livestock Wastewater Treatment Plant, Sanju city)
Min, Kyung-Sok (Department of Environmental Engineering, Kyungpook National University)
Publication Information
Journal of Korean Society on Water Environment / v.22, no.5, 2006 , pp. 895-904 More about this Journal
Abstract
The improved MLE (modified Ludzack-Ettinger) process was operated for piggery waste treatment in full-scale public livestock waste treatment plant. The treated waste from bioreactor was suitable for the strict effluent standard of 200 mgCOD/L and 60 mgTN/L as it was dewatered chemically without settling tank and passed through filtration process. Though this treatment method produced a great deal of sludge ($6.4m^3\;per\;m^3$ dewatered piggery waste) it was able to accomplish predominant effluent quality by removing non-biodegradable COD and color without advanced oxidation process as ozone, fenton and etc.. The nitrogen removal efficiency of bioreactor was rapidly declined from March to May (from 0.016 to 0.005 kgN/kgVSS-day) when disinfection is in earnest as well as from warm season when reactor temperature rises higher than $35^{\circ}C$(from 0.016 to 0.008 kgN/kgVSS-day). This study proves that counterplanes for infection residuals, bioreactor temperature and dewatering sludge reduction are necessary for piggery waste treatment.
Keywords
Improved MLE process; Infection residuals; Piggery waste; Sludge reuse; Temperature;
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