Development of a Biological Filter Utilizing Organic Growth Media for Wastewater Treatment and Nitrogen Oxidation
Development of a Biological Filter Utilizing Organic Growth Media for Wastewater Treatment and Nitrogen Oxidation作者机构：Department of Biological and Agricultural Engineering Louisiana State University AgCenter Baton Rouge 70803 Louisiana70803 United States LSU AgCenter Callegari Environmental Center Baton Rouge 70803 Louisiana 70803 United States
出 版 物：《Journal of Agricultural Science and Technology(B)》 (农业科学与技术（B）)
年 卷 期：2012年第2卷第1期
页 面：62-73页
学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0815[工学-水利工程]
主 题：Wastewater nitrification ammonia biological filter rice hull.
摘 要：Loss of ammonia-nitrogen to volatilization and the over application of phosphorus in agricultural wastewaters has led to excess phosphorus build up in topsoil and in surface waters. In order to increase the usable amount nitrogen in agricultural wastewaters, the wastewaters underwent a nitrogen treatment process consisting of a hanging basket biological filter. The filters utilized never before used biological growth media, rice hulls, to assist in the formation of a mature biofilms as the oxidation of ammonia to nitrate. The filter design was used on a lab scale that treated both artificial wastewater and dairy parlor wastewater treated with a lime precipitation step for phosphorus treatment. The filters were tested to see if bio-fouling occurred in the filter media bed under high nitrogen loading, if the rice hulls could withstand an extended time frame as bacterial growth media, and to see if the oxidation of ammonia to nitrate would occur. A 50% reduction in ammonia occurred between 30 and 48 hrs in each trial with eventual nitrite oxidation reported in the final two trials. Statistical analysis preformed determined that the ammonia removal rates at the beginning of both the synthetic wastewater and dairy parlor wastewater ten-day tests were statistically similar, but varied toward the end of the trials.
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