Treatment of piggery wastewater using multi-soil-layering system
A series of multi-soil-layering systems (MSL) in a lab scale was employed to study the efficiency and the mechanism of chemical oxygen demand (COD<sub>Cr</sub>) of organic matter, N and P removal in the wastewater generated from piggery at the hydraulic loading rates of 50, 100, 200, and...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2012-05-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2012.03.015 |
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| Summary: | A series of multi-soil-layering systems (MSL) in a lab scale was employed to study the efficiency and the mechanism of chemical oxygen demand (COD<sub>Cr</sub>) of organic matter, N and P removal in the wastewater generated from piggery at the hydraulic loading rates of 50, 100, 200, and 300 L·m<sup>-2</sup>·d<sup>-1</sup>. The results showed that the mean removal rates of organic matter were 74.8%, 72.6%, 59.5% and 33.4% under the four hydraulic loading rates, respectively, microbial decomposition process being the main mechanism of organic matter removal. The mean removal rates of ammonium nitrogen were 82.1%, 71.0%, 30.0%, and 18.9%, respectively, and the nitrification / denitrification process could remarkably account for total nitrogen removal. The mean removal rates of phosphorus were 61.4%, 56.0%, 39.1% and 23.0% under the four hydraulic loading rates, respectively, and phosphorus removal was own to its strong adsorption onto substrates. This experiment also showed that hydraulic loading rate was an important factor affecting piggery wastewater treatment efficiency, especially the removal of nitrogen, suggesting that an appropriate hydraulic loading rate was maintained to obtain an optimum efficiency of COD<sub>Cr</sub>, N and P removal. Results above indicate that an MSL system with little energy consumption could be practically adopted to treat piggery wastewater. |
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| ISSN: | 1008-9209 2097-5155 |