TY - JOUR
T1 - Risks of using EDTA as an agent for trace metals dosing in anaerobic digestion of olive mill solid waste
AU - Serrano, A.
AU - Pinto-Ibieta, F.
AU - Braga, A. F.M.
AU - Jeison, D.
AU - Borja, R.
AU - Fermoso, F. G.
N1 - Publisher Copyright:
© 2017 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2017/12/17
Y1 - 2017/12/17
N2 - Low concentrations of trace elements in many organic wastes recommend their supplementation in order to avoid potential limitations. Different chelating agents have been used to ensure an adequate trace metal pool in the soluble fraction, by forming dissolved complexes. Ethylenediaminetetraacetic acid (EDTA) is probably the most common, although several negative effects could be associated with its usage. Biomethane potential tests were performed using Olive Mill Solid Waste as the substrate, supplementing different combinations of Fe, Co, Ni, Ba, always under the presence of EDTA. Results show that Ni and Co slightly recovered biodegradability. However, Ba supplementation resulted in worsening the methane yield coefficient in all cases. High concentration of EDTA led to decrease in the activity of anaerobic digestion. High availability of EDTA induces the capture of trace metals like Co or Ni, key trace metals for anaerobic biomass activity. While supplementing trace metals, the addition of Ba and/or EDTA must be carefully considered.
AB - Low concentrations of trace elements in many organic wastes recommend their supplementation in order to avoid potential limitations. Different chelating agents have been used to ensure an adequate trace metal pool in the soluble fraction, by forming dissolved complexes. Ethylenediaminetetraacetic acid (EDTA) is probably the most common, although several negative effects could be associated with its usage. Biomethane potential tests were performed using Olive Mill Solid Waste as the substrate, supplementing different combinations of Fe, Co, Ni, Ba, always under the presence of EDTA. Results show that Ni and Co slightly recovered biodegradability. However, Ba supplementation resulted in worsening the methane yield coefficient in all cases. High concentration of EDTA led to decrease in the activity of anaerobic digestion. High availability of EDTA induces the capture of trace metals like Co or Ni, key trace metals for anaerobic biomass activity. While supplementing trace metals, the addition of Ba and/or EDTA must be carefully considered.
KW - Ethylenediaminetetraacetic acid
KW - metal affinity
KW - methane production rate
KW - microbial activity
KW - olive mill solid waste
KW - trace metal supplementation
UR - http://www.scopus.com/inward/record.url?scp=85013502758&partnerID=8YFLogxK
U2 - 10.1080/09593330.2017.1290149
DO - 10.1080/09593330.2017.1290149
M3 - Article
C2 - 28151052
AN - SCOPUS:85013502758
SN - 0959-3330
VL - 38
SP - 3137
EP - 3144
JO - Environmental Technology (United Kingdom)
JF - Environmental Technology (United Kingdom)
IS - 24
ER -