TY - JOUR
T1 - Removal of humic and tannic acids by adsorption-coagulation combined systems with activated biochar
AU - Jung, Chanil
AU - Phal, Narong
AU - Oh, Jeill
AU - Chu, Kyoung Hoon
AU - Jang, Min
AU - Yoon, Yeomin
N1 - Funding Information:
This research was financially supported by the Korea Ministry of Environment , ‘Project, 414-111-006′. This research was also supported by a grant (code 15IFIP-B088091-02) from Industrial Facilities & Infrastructure Research Program funded by Ministry of Land, Infrastructure and Transport of Korean government .
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/12/30
Y1 - 2015/12/30
N2 - Despite recent interest in transforming biomass into bio-oil and syngas, there is inadequate information on the compatibility of byproducts (e.g., biochar) with agriculture and water purification infrastructures. A pyrolysis at 300. °C yields efficient production of biochar, and its physicochemical properties can be improved by chemical activation, resulting in a suitable adsorbent for the removal of natural organic matter (NOM), including hydrophobic and hydrophilic substances, such as humic acids (HA) and tannic acids (TA), respectively. In this study, the adsorption affinities of different HA and TA combinations in NOM solutions were evaluated, and higher adsorption affinity of TA onto activated biochar (AB) produced in the laboratory was observed due to its superior chemisorption tendencies and size-exclusion effects compared with that of HA, whereas hydrophobic interactions between adsorbent and adsorbate were deficient. Assessment of the AB role in an adsorption-coagulation hybrid system as nuclei for coagulation in the presence of aluminum sulfate (alum) showed a synergistic effect in a HA-dominated NOM solution. An AB-alum hybrid system with a high proportion of HA in the NOM solution may be applicable as an end-of-pipe solution.
AB - Despite recent interest in transforming biomass into bio-oil and syngas, there is inadequate information on the compatibility of byproducts (e.g., biochar) with agriculture and water purification infrastructures. A pyrolysis at 300. °C yields efficient production of biochar, and its physicochemical properties can be improved by chemical activation, resulting in a suitable adsorbent for the removal of natural organic matter (NOM), including hydrophobic and hydrophilic substances, such as humic acids (HA) and tannic acids (TA), respectively. In this study, the adsorption affinities of different HA and TA combinations in NOM solutions were evaluated, and higher adsorption affinity of TA onto activated biochar (AB) produced in the laboratory was observed due to its superior chemisorption tendencies and size-exclusion effects compared with that of HA, whereas hydrophobic interactions between adsorbent and adsorbate were deficient. Assessment of the AB role in an adsorption-coagulation hybrid system as nuclei for coagulation in the presence of aluminum sulfate (alum) showed a synergistic effect in a HA-dominated NOM solution. An AB-alum hybrid system with a high proportion of HA in the NOM solution may be applicable as an end-of-pipe solution.
KW - Activated biochar
KW - Adsorption
KW - Coagulation
KW - Natural organic matter
KW - Synergistic effect
UR - http://www.scopus.com/inward/record.url?scp=84940555307&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2015.08.025
DO - 10.1016/j.jhazmat.2015.08.025
M3 - Article
C2 - 26340547
AN - SCOPUS:84940555307
SN - 0304-3894
VL - 300
SP - 808
EP - 814
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -