TY - JOUR
T1 - Nutrient removal from digested swine wastewater by combining ammonia stripping with struvite precipitation
AU - Cao, Leipeng
AU - Wang, Jingjing
AU - Xiang, Shuyu
AU - Huang, Zhenghua
AU - Ruan, Roger
AU - Liu, Yuhuan
N1 - Publisher Copyright:
© 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2019/3/8
Y1 - 2019/3/8
N2 - Typical biological processing is often challenging for removing ammonia nitrogen and phosphate from swine wastewater due to inhibition of high ammonia on activity of microorganisms, exhaustion of time, and low efficiency. In this study, a physicochemical process by combining ammonia stripping with struvite precipitation has been tested to simultaneously remove ammonia nitrogen, phosphate, and chemical oxygen demand (COD) from digested swine wastewater (DSW) with high efficiency, low cost, and environmental friendliness. The pH, temperature, and magnesium content of DSW are the key factors for ammonia removal and phosphate recovery through combining stripping with struvite precipitation. MgO was used as the struvite precipitant for NH 4 + and PO 4 3− and as the pH adjusted for air stripping of residual ammonia under the condition of 40 °C and 0.48 m 3 h −1 L −1 aeration rate for 3 h. The results showed that the removal efficiency of ammonia, total phosphate, and COD from DSW significantly increased with increase of MgO dosage due to synergistic action of ammonia stripping and struvite precipitation. Considering the processing cost and national discharge standard for DSW, 0.75 g L −1 MgO dosage was recommended using the combining technology for nutrient removal from DSW. In addition, 88.03% NH 4 + -N and 96.07% TP could be recovered from DSW by adsorption of phosphoric acid and precipitation of magnesium ammonium phosphate (MAP). The combined technology could effectively remove and recover the nutrients from DSW to achieve environmental protection and sustainable and renewable resource of DSW. An economic analysis showed that the combining technology for nutrient removal from DSW was feasible.
AB - Typical biological processing is often challenging for removing ammonia nitrogen and phosphate from swine wastewater due to inhibition of high ammonia on activity of microorganisms, exhaustion of time, and low efficiency. In this study, a physicochemical process by combining ammonia stripping with struvite precipitation has been tested to simultaneously remove ammonia nitrogen, phosphate, and chemical oxygen demand (COD) from digested swine wastewater (DSW) with high efficiency, low cost, and environmental friendliness. The pH, temperature, and magnesium content of DSW are the key factors for ammonia removal and phosphate recovery through combining stripping with struvite precipitation. MgO was used as the struvite precipitant for NH 4 + and PO 4 3− and as the pH adjusted for air stripping of residual ammonia under the condition of 40 °C and 0.48 m 3 h −1 L −1 aeration rate for 3 h. The results showed that the removal efficiency of ammonia, total phosphate, and COD from DSW significantly increased with increase of MgO dosage due to synergistic action of ammonia stripping and struvite precipitation. Considering the processing cost and national discharge standard for DSW, 0.75 g L −1 MgO dosage was recommended using the combining technology for nutrient removal from DSW. In addition, 88.03% NH 4 + -N and 96.07% TP could be recovered from DSW by adsorption of phosphoric acid and precipitation of magnesium ammonium phosphate (MAP). The combined technology could effectively remove and recover the nutrients from DSW to achieve environmental protection and sustainable and renewable resource of DSW. An economic analysis showed that the combining technology for nutrient removal from DSW was feasible.
KW - Digested swine wastewater
KW - NH -N
KW - Phosphorus recovery
KW - Stripping
KW - Struvite precipitation
KW - Volatile solid
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U2 - 10.1007/s11356-019-04153-x
DO - 10.1007/s11356-019-04153-x
M3 - Article
C2 - 30632036
AN - SCOPUS:85059846915
SN - 0944-1344
VL - 26
SP - 6725
EP - 6734
JO - Environmental Science and Pollution Research
JF - Environmental Science and Pollution Research
IS - 7
ER -
