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- Title
Effect of Pyrite Pretreatment, Particle Size, Dose, and Biomass Concentration on Particulate Pyrite Autotrophic Denitrification of Nitrified Domestic Wastewater.
- Authors
Tong, Shuang; Rodriguez-Gonzalez, Laura C.; Payne, Karl A.; Stocks, Justine L.; Feng, Chuanping; Ergas, Sarina J.
- Abstract
Nitrate (NO3−) loads from domestic and industrial wastewater contribute to surface and groundwater pollution and can have detrimental effects on human health and the environment. In this study, a particulate pyrite autotrophic denitrification (PPAD) process was compared with sulfur-oxidizing denitrification (SOD) in batch microcosms using a domestic wastewater seed. During a 65-day acclimation period, denitrification rates for PPAD reached 3.19 mg/(L·d), but were slower than the maximum rate for SOD (∼5 mg/[L·d]). Lower sulfate (SO42−) production (5.66 mg SO42−/mg NO3−-N) and alkalinity consumption (1.70 mg CaCO3/mg NO3−-N) were observed with PPAD than with SOD (7.54 mg SO42−/mg NO3−-N and 4.57 mg CaCO3/mg NO3−-N). Acetone pretreatment of pyrite particles initially resulted in a transient increase in the denitrification rate; however, the rate of denitrification was similar to untreated pyrite in subsequent cycles. Box–Behnken design and response surface methodology were used to optimize biomass concentration, pyrite dose, and particle size. Denitrification rates were highest at a volatile suspended solids concentration of 1,250 mg/L, a pyrite dose of 125 g/L, and a particle size of 0.815–1.015 mm. The PPAD process is a promising technology for the treatment of NO3−-contaminated water and wastewater due to low biomass and sulfur by-product production, low alkalinity consumption and low carry-over of organic carbon to the effluent.
- Subjects
NITROGEN removal (Water purification); PYRITES; PARTICLE size determination; BIOMASS production; WASTEWATER treatment; GROUNDWATER pollution
- Publication
Environmental Engineering Science, 2018, Vol 35, Issue 8, p875
- ISSN
1092-8758
- Publication type
Article
- DOI
10.1089/ees.2017.0295