Deodorization of pig manure using lignin peroxidase with different electron acceptors

Abstract

Odor pollution is a big environmental problem caused by large-scale livestock production in China, and developing a practical way to reduce these odors is pressing. In this study, a combination of 0.2-1.0 U/mL lignin peroxidase (LiP) and one of three peroxides (H 2 O 2 , CaO 2 , 2Na 3 CO 3 ·3H 2 O 2 ) was examined for its efficiency in reducing the release of eight chemicals (propionic acid, isobutyric acid, isocaproic acid, isovaleric acid, phenol, p-cresol, indole, and skatole), NH 3 , H 2 S, and odor intensity from pig manure. The results showed an approximately 90% reduction in p-cresol, 40-60% reduction in odor intensity, 16.5-40% reduction in indolic compounds, and 25-40% reduction in volatile fatty acids. Being the electron acceptors of LiP, 2Na 3 CO 3 ·3H 2 O 2 and CaO 2 performed better than H 2 O 2 in reducing the concentration of eight chemicals, NH 3, H 2 S, and odor intensity from pig manure. The effect of deodorization can last for up to 72 hr.Implications: In China, one of the major environmental problems caused by confined feeding is odor pollution, which brings a major threat to the sustainability, profitability, and growth of the livestock industry. To couple the LiP with the electron acceptors, a low-cost, simple, and feasible method for odor removal was established in this study. Based on the study results, a practical treatment method was provided for odor pollution and supply the farm operators a more flexible time to dispose treated manure.PAPER HISTORY

Biodegradable, Colorless, and Odorless PLA/PBAT Bioplastics Incorporated with Corn Stover

“…There are several approaches to reducing malodorous compounds and chromophores in lignocellulosic biomass. − Among them, alkaline hydrogen peroxide treatment is a mature industrial technology for pulp bleaching . Moreover, peroxides are reported to deodorize materials or environments by degrading volatiles to non-odorous fragments. − Considering the production on an industrial scale with low cost and environmental friendliness, we thereby used hydrogen peroxide oxidation treatment on CS to realize the decolorization and deodorization of bioplastics.…”

Emission of Greenhouse Gases and Odorants from Pig Slurry - Effect on the Environment and Methods of its Reduction

“…Another environmentally friendly and low-cost method for odour removal from pig slurry involves the use of lignin peroxidase combined with peroxides (CaO 2 or 2Na 3 CO 3 •3H 2 O 2 ). Such pig slurry treatment reduces odour intensity by 40-60 % and phenolic compounds by approximately 90 % [69].…”