Addition of pig manure hydrolysate as a carbon source to enhance nitrate removal from piggery wastewater under different HRTs. Issue 3 (June 2019)

• Record Type: Journal Article
• Authors: Yang, Jie; Wang, Dehan; Luo, Zifeng
• Is Part Of: Journal of environmental chemical engineering. Volume 7:Issue 3(2019)
• Publication Date: 2019-06
• Subjects: PMC pig manure hydrolysate as an external carbon source -- HPCLD high-density polyethylene covered lagoon digesters -- HRT hydraulic residence time -- SBR sequencing batch reactor -- PM pig manure -- TVFAs total volatile fat acids -- MLVSS mixed-liquid volatile suspended solids -- MLSS mixed-liquid suspended solids -- COD chemical oxygen demand -- FLWPSS fermentation liquid of wastewater primary sedimentation sludge -- EAS excess activated sludge -- THSS thermal hydrolysis sludge supernatant -- FLFW fermentation liquid from food wastes -- FRW food waste-recycling wastewater -- FSFW thermophilic fermentation slurry from food waste -- FSL fermented soybean liquids -- AFKW alkaline fermentation of kitchen wastewater -- RW raw wastewater -- DW domestic wastewater -- IW&MW industry wastewater and municipal wastewater -- SW synthetic wastewater -- WWTP wastewater treatment plant -- TW tail water -- MW municipal wastewater -- PW piggery water; Pig manure carbon source -- Nitrate -- Nitrite -- Nitrogen -- Denitrification; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2019.103071
• Languages: English
• ISSNs: 2213-2929

Abstract

Graphical abstract: Highlights: Pig manure carbon source (PMC) was obtained easily (70 °C, 1 h). Pig manure hydrolysate as a carbon source for the first time. PMC performed better than the sodium acetate. PMC improved the denitrification rate, effectively. With the PMC, NO3 -N removal rate was 99%, TN removal rate was 90%. Abstract: To develop a quick, efficient, economical and easy method of obtaining a carbon source for piggery wastewater, thermo-alkaline treatment of pig manure hydrolysate as an external carbon source (PMC), which contains a high concentration of VFAs, was used. Batch experiments were carried out to determine the effect of the COD/TN ratio on piggery wastewater denitrification using PMC, and a comparison was made between PMC and sodium acetate for the denitrification at the optimum COD/TN ratio. Then, the effect of PMC on piggery wastewater denitrification was proven in a sequencing batch reactor. The results show that when PMC is applied, the appropriate C/N ratio for denitrification is 6.5, which is equivalent to an addition of 3.8%. Under these conditions, PMC performed better than sodium acetate. With PMC, the contents of NO2 -N and NO3 -N in the SBR under three different HRTs were less than 0.02 mg/L and 5 mg/L, respectively, and the TN removal rate was 90%. The highest denitrification rate of SBR was 25.37 mg NO3 -N/(g VSS h).