TY - JOUR
T1 - Impact of zeolite amendment on composting of food waste digestate
AU - Manu, M. K.
AU - Wang, Chen
AU - Li, Dongyi
AU - Varjani, Sunita
AU - Wong, Jonathan W.C.
PY - 2022/10/15
Y1 - 2022/10/15
N2 - Food waste digestate (FWD) is an organic waste characterized by high NH4+-N content and its composting is challenging due to the higher NH3 emission and nitrogen loss. In the present study, FWD was co-composted with sawdust and mature compost, and zeolite was used as a physical additive for nitrogen conservation. The results demonstrated that amending 5% and 10% zeolite reduced the NH3 emission to 1.8% and 1.6%, respectively, compared to 2.5% in the control without any zeolite. Overall, the zeolite amendment had a positive impact on nitrogen conservation as the nitrogen loss could be mitigated by 34–39% using 5–10% dosages. Besides, the zeolite addition showed considerable improvement in the FWD decomposition as the degradation rate was increased by 30–32% resulting in a carbon loss of 27–29%. Furthermore, the phytotoxic nature of FWD could be diminished by zeolite amendment which reduced the NH4+-N contents to a permissible limit (≤500 mg/kg dm) and increased the seed germination index to > 80% in 14 days of co-composting. © 2022 Elsevier Ltd. All rights reserved.
AB - Food waste digestate (FWD) is an organic waste characterized by high NH4+-N content and its composting is challenging due to the higher NH3 emission and nitrogen loss. In the present study, FWD was co-composted with sawdust and mature compost, and zeolite was used as a physical additive for nitrogen conservation. The results demonstrated that amending 5% and 10% zeolite reduced the NH3 emission to 1.8% and 1.6%, respectively, compared to 2.5% in the control without any zeolite. Overall, the zeolite amendment had a positive impact on nitrogen conservation as the nitrogen loss could be mitigated by 34–39% using 5–10% dosages. Besides, the zeolite addition showed considerable improvement in the FWD decomposition as the degradation rate was increased by 30–32% resulting in a carbon loss of 27–29%. Furthermore, the phytotoxic nature of FWD could be diminished by zeolite amendment which reduced the NH4+-N contents to a permissible limit (≤500 mg/kg dm) and increased the seed germination index to > 80% in 14 days of co-composting. © 2022 Elsevier Ltd. All rights reserved.
KW - Ammonia emission
KW - Compost maturity
KW - Food waste digestate
KW - Nitrogen conservation
KW - Phytotoxicity
KW - Zeolite
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UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85135991124&origin=recordpage
U2 - 10.1016/j.jclepro.2022.133408
DO - 10.1016/j.jclepro.2022.133408
M3 - RGC 21 - Publication in refereed journal
SN - 0959-6526
VL - 371
JO - Journal of Cleaner Production
JF - Journal of Cleaner Production
M1 - 133408
ER -
