Treatment of strong nitrogen swine wastewater in a full-scale sequencing batch reactor

Abstract

Treatment of swine wastewater containing strong nitrogen was attempted in a full-scale SBR. The strongest swine wastewater was discharged from a slurry-type barn and called swine-slurry wastewater (SSW). Slightly weaker wastewater was produced from a scraper-type barn and called swine-urine wastewater (SUW). TCOD, NH4+-N and TSS in raw SSW were 23,000-72,000 mg/L, 3,500-6,000 mg/L and 17,000-50,000 mg/L, respectively. A whole cycle of SBR consists of 4 sub-cycles with anoxic period of 1 hr and aerobic period of 3 hr. The maximum loading rates of both digested-SSW and SUW were similar to 0.22 kg NH4+-N/m3/day whereas the maximum loading rates of raw SSW was up to 0.35 TN/m3/day on keeping the effluent quality of 60 TN mg/l. The VFAs portion of SCOD in raw SSW was about more than 60%. The VFAs in SUW and digested-SSW were about 22% and 15%, respectively. NH4+-N and PO4(3-)-P in SSW were removed efficiently compared to those in digested-SSW and DUW because SSW had high a C/N ratio and readily biodegradable organic. High concentration of organic was useful to enhance denitrification and P uptake. Also the amount of external carbon for denitrification was reduced to 5% and 10% of those for digested-SSW and SUW.

Sequencing batch reactor technology for biological wastewater treatment: a review

“…Addition of acetate is reported to enhance the rate of denitrification to four times than methanol 14. However, for strong wastewater with high organic concentration, the amount of external C source has been reduced to 5% 15. An established SND technology thus, save operation time and energy, and replace the traditional two‐stage biological nitrification and denitrification process 11…”

“…2). The NH 4 + ‐N and PO 4 −3 ‐P were effectively removed due to high C/N ratio and readily biodegradable organic 15. Likewise, shrimp aquaculture wastewater having high C/N ratio was treated sequentially, viz.…”

Optimization and evaluation of an air-recirculated stripping for ammonia removal from the anaerobic digestate of pig manure

“…The anaerobic digestate is rich in nitrogen, which can lead to water eutrophication (Zeng et al, 2003;Buosi et al, 2011), groundwater pollution (Hao and Chang, 2002), and air pollution. Nitrogen can be removed from anaerobic digestate using nitrification and denitrification (Deng et al, 2006), magnesium ammonium phosphate (Song et al, 2007;Liu et al, 2011), membrane filtration (Mondor et al, 2008), and ammonia stripping (Liao et al, 1995;Guštin and + -N) of anaerobic digestate is low, and traditional biochemical treatments are unsuitable because of the poor biodegradability of this digestate (Liao and Maekawa, 1994;Bortone et al, 1994;Poo et al, 2004). Ammonia stripping is a physical-chemical procedure advanced for treatment of anaerobic digestate and it is unaffected by toxic compounds, that could disrupt the performance of a biological system.…”

Whey permeate as a phosphorus source for algal cultivation

“…This approach is a preferred bioremediation method because microalgae can efficiently recover nutrients from wastewaters into valuable microalgal biomass (Benemann, 2013). However, several wastewater streams are rich in N but poor in P (Sherrard, 1985), for example, landfill leachate, digested swine wastewater, wet market wastewater, and coking wastewater with the N:P mole ratios of 200–700:1 (Paskuliakova et al, 2018), 194–543:1 (Poo et al, 2004), 51:1 (bte Jais et al, 2015), and 70–892:1 (Jin et al, 2013), respectively. Hence, there is a need for a sustainable P source to balance nutrients for an economic cultivation of microalgae.…”