Effects of dicyandiamide and Mg/P on the global warming potential of swine slurry and sawdust cocomposting

Composting is an emerging strategy for swine slurry treatment; nonetheless, significant greenhouse gases (GHG) emissions may occur during this process. We carried out two separate assays with increasing doses of dicyandiamide (DCD; up to 1.1% w/w) as a nitrification inhibitor and solutions of MgCl 2...

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Bibliographic Details
Published in:	Environmental science and pollution research international Vol. 27; no. 24; pp. 30405 - 30418
Main Authors:	Sardá, Luana G., Higarashi, Martha M., Nicoloso, Rodrigo S., Falkoski, Camila, Ribeiro, Stephanie M. S., Silveira, Carlos A. P., Soares, Hugo M.
Format:	Journal Article
Language:	English
Published:	Berlin/Heidelberg Springer Berlin Heidelberg 01-08-2020 Springer Nature B.V
Subjects:	Agricultural economics Agrochemicals Anti-inflammatory agents Aquatic Pollution Atmospheric Protection/Air Quality Control/Air Pollution Carbon dioxide Climate change Composting Composts Contaminants Cosmetics Cost analysis Crystallization Earth and Environmental Science Ecotoxicology Electrodes Electrokinetics Emissions Environment Environmental Chemistry Environmental Health Environmental science Global warming Greenhouse gases Ibuprofen Inactivation Inflammation Metal foams Methane Nitrification Nitrous oxide Nonsteroidal anti-inflammatory drugs Organic chemistry Performance degradation Pig manure Remediation Research Article Ruthenium oxide Sawdust Slurries Soil contamination Soil pollution Soil remediation Swine Veterinary medicine Waste Water Technology Water Management Water Pollution Control Struvite precipitation Swine slurry Additives Cocomposting Dicyandiamide Greenhouse gas
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Summary:	Composting is an emerging strategy for swine slurry treatment; nonetheless, significant greenhouse gases (GHG) emissions may occur during this process. We carried out two separate assays with increasing doses of dicyandiamide (DCD; up to 1.1% w/w) as a nitrification inhibitor and solutions of MgCl 2 and H 3 PO 4 (Mg/P; up to 0.09/0.06 mol kg −1 ) to promote struvite crystallization in order to assess their efficiencies as additives to decrease GHG emission during swine slurry cocomposting with sawdust (1:1v/v). We monitored the nitrous oxide (N 2 O-N), methane (CH 4 -C), and carbon dioxide (CO 2 -C) emissions and the ammonia (NH 4 + -N) and nitrate/nitrite (NOx-N) concentrations in compost reactors (35 L) during the first 4–5 weeks of composting. DCD had no effect on CH 4 -C and CO 2 -C emissions but decreased N 2 O-N losses by up to 56% compared with control. However, DCD inactivation was favored by thermophilic conditions and N 2 O-N emissions increased to same levels of control after 13 days. Mg/P was effective to decrease N 2 O-N losses only at the highest dose, which also sustained higher [NH 4 + -N] in the compost by the end of the assessment. Nonetheless, the use of 0.09/0.06 mol kg −1 of Mg/P also decreased CH 4 -C and CO 2 -C emissions compared with lower doses of Mg/P and unamended treatments. Overall, DCD and Mg/P amendments decreased the global warming potential (GWP) of swine slurry composting by up to 46 and 28%, respectively. The Mg/P application may be also interesting to increase the compost quality by increasing its NH 4 + -N availability. Graphical abstract
ISSN:	0944-1344 1614-7499
DOI:	10.1007/s11356-020-09244-8