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- Title
Pilot-scale sulfur autotrophic denitrification biofilter in denitrification of pig farm wastewater biological tail water.
- Authors
Qing Zhang
- Abstract
Pig wastewater is a type of effluent referred to as biochemical tailwater, characterized by its high concentrations of total nitrogen and nitrate. The reintroduction of manure into agricultural fields, namely through the use of pig wastes biochemical tailwater, can potentially lead to challenges associated with nitrate contamination in groundwater. The objective of this study was to investigate the efficacy of the sulphur limestone autotrophic denitrification system in removing nitrate nitrogen from wastewater. This system utilizes sulphur monomers as electron donors and carbonate as a source of inorganic carbon. The most cost-effective method for mitigating nitrate nitrogen in pig effluent is the utilization of a sulphur limestone autotrophic denitrification system. The afore- mentioned methodology is very suitable for the removal of impurities in agricultural produce due to its ability to achieve a complete reaction without the need for the addition of an organic carbon source. The concentration of nitrate-nitrogen in the biochemical tail water of pig wastewater has been seen to decrease significantly, from an initial level of 42 mg/L to a final level of 8 mg/L, as a result of the denitrification process carried out in the sulphur limestone autoclave reactor. When the hydraulic retention time is set to 3 h, the reactor's volumetric loading can reach a value of 0.45 kg⋅NO3-N/(m³⋅d). The nitrate nitrogen present in pig effluent can be extracted through the utilization of a sulphur limestone autoclave reactor following the process of denitrification. The utilization of this reactor has the potential to efficiently reduce the content of nitrate-nitrogen in the biochemical tail water of pig effluent, so mitigating the issue of groundwater pollution when the treated manure water is reintroduced into the field.
- Subjects
SWINE farms; DENITRIFICATION; BIOFILTERS; SEWAGE; SULFUR; WILDLIFE reintroduction; NITROGEN removal (Water purification)
- Publication
Desalination & Water Treatment, 2023, Vol 316, p151
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2023.30182