In:
Journal of Environmental Quality, Wiley, Vol. 47, No. 4 ( 2018-07), p. 786-794
Abstract:
Stored liquid dairy manure is a hotspot for methane (CH 4 ) emission, thus effective mitigation strategies are required. We assessed sodium persulfate (Na 2 S 2 O 8 ), potassium permanganate (KMnO 4 ), and sodium hypochlorite (NaOCl) for impacts on the abundance of microbial communities and CH 4 production in liquid dairy manure. Liquid dairy manure treated with different rates (1, 3, 6, and 9 g or mL L −1 slurry) of these chemicals or their combinations were incubated under anoxic conditions at 22.5 ± 1.3°C for 120 d. Untreated and sodium 2‐bromoethanesulfonate (BES)‐treated manures were included as negative and positive controls, respectively, whereas sulfuric acid (H 2 SO 4 )‐treated manure was used as a reference. Quantitative real‐time polymerase chain reaction was used to quantify the abundances of bacteria and methanogens on Days 0, 60, and 120. Headspace CH 4 /CO 2 ratios were used as a proxy to determine CH 4 production. Unlike bacterial abundance, methanogen abundance and CH 4 /CO 2 ratios varied with treatments. Addition of 1 to 9 g L −1 slurry of Na 2 S 2 O 8 and KMnO 4 reduced methanogen abundance (up to ∼28%) and peak CH 4 /CO 2 ratios (up to 92‐fold). Except at the lowest rate, chemical combinations also reduced the abundance of methanogens (up to ∼17%) and CH 4 /CO 2 ratios (up to ninefold), although no impacts were observed when 3% NaOCl was used alone. With slurry acidification, the ratios reduced up to twofold, whereas methanogen abundance was unaffected. Results suggest that Na 2 S 2 O 8 and KMnO 4 may offer alternative options to reduce CH 4 emission from stored liquid dairy manure, but this warrants further assessment at larger scales for environmental impacts and characteristics of the treated manure. Core Ideas Chemical oxidants were assessed for potential effects on methanogens and methane production. The abundance of methanogens and CH 4 production were affected by Na 2 S 2 O 8 and KMnO 4 . Na 2 S 2 O 8 and KMnO 4 had similar effects on CH 4 production compared with acidification. Na 2 S 2 O 8 and KMnO 4 may provide options to mitigate CH 4 emissions from stored liquid dairy manure.
Type of Medium:
Online Resource
ISSN:
0047-2425
,
1537-2537
DOI:
10.2134/jeq2018.01.0054
Language:
English
Publisher:
Wiley
Publication Date:
2018
detail.hit.zdb_id:
120525-0
detail.hit.zdb_id:
2050469-X
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