Nutrient Removal and Nitrous Oxide Emission by a Two-Step Fed SBR in Treating Dairy Manure Wastewater

Author:

Wu Sarah (Xiao)

Abstract

Abstract. In this study, a two-step fed sequencing batch reactor (SBR) was employed to treat dairy manure wastewater to remove nutrients, including nitrogen, phosphorus, 5-day biochemical oxygen demand (BOD5), and chemical oxygen demand (COD), and to examine the associated nitrous oxide (N2O) emission by the SBR treatment. The SBR was operated on an 8 h cycle with preset time periods for different phases, including anoxic/anaerobic/aerobic phases. The results showed that the SBR system could effectively reduce the nutrients in the wastewater, with removal efficiencies reaching 86.6%, 95.6%, 98.8%, 100%, 97.9%, 95.6%, and 99.8%, respectively, for volatile solids (VS), volatile suspended solids (VSS), total Kjeldahl nitrogen (TKN), ammonium nitrogen (NH4+-N), total phosphorus (TP), COD, and BOD5. However, the SBR could not complete denitrification at the end of the cycle, with 12 mg L-1 nitrate left in the effluent, possibly due to suppression of denitrifiers by the anoxic/aeration phase that was placed almost at the end of cycle and overprovided oxygen to the liquid. Denitrification was found to be a major process for N2O generation, so reducing denitrification time in the cycle is recommended, given that the overall performance of the SBR system in removing nutrients was not compromised. Using oxidation-reduction potential (ORP) alone to automate the SBR control was not sufficient to avoid failure of the system. Keywords: Dairy manure wastewater, Nitrous oxide emission, Nutrient removal, ORP control, Sequencing batch reactor, Two-step fed strategy.

Funder

N/A

Publisher

American Society of Agricultural and Biological Engineers (ASABE)

Subject

Soil Science,Agronomy and Crop Science,Biomedical Engineering,Food Science,Forestry

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3