Integrating EMMC Process for Biological Removal of Carbon and Nitrogen from Dilute Swine Wastewater for Agricultural Reuse

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Abstract:

Development of a simple operation pattern for simultaneous removal of carbon and nitrogen from dilute swine wastewater is the main objective of this study. Entrapped mixed microbial cells (EMMC) process was used to investigate this potential. Cellulose triacetate was used as the matrix for entrapping the mixed microbial cells and various oxygen supply conditions (ratios of aeration and non-aeration) and two types of carrier sizes (large and medium) were investigated. It was found that the best ratio of aeration and non-aeration for the screened dilute swine wastewater is one to one for both carrier sizes. At HRT of 30 hours and influent concentration of Total COD and nitrogen of 1164–2104 mg/L and 442–582 mg/L, respectively, the removal efficiencies of Total COD and nitrogen are 79.61±3.2% and 86.18±3.43% for large carrier unit, respectively. For medium carrier unit, the removal efficiencies are slightly higher than the large carrier unit. The Total COD removal efficiency is close to the batch biodegradability study. For the nitrogen removal, it can be increased to 92–95% by the increase of COD/N ratio from 3.0 to 4.0 using the pre-treatment of ammonium crystallization of the dilute swine wastewater. This will depend on the need of the reuse or disposal of treated swine wastewater. The unit cost for a 2000 pig operation is about 4.91/pig/year. For the application of EMMC process, a suitable farm size would be greater than a 2000 pig operation. Because of the high efficiency and simple operation of simultaneous removal of carbon and nitrogen, the EMMC process is very suitable to be integrated for dilute swine wastewater treatment for land limited area and is easy for the development of prefabricated wastewater treatment and reuse units.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864700784995019

Publication date: January 1, 2000

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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