Effect of co-pyrolysis of agricultural and forestry wastes on Cu(Ⅱ)adsorption properties of sludge biochar
The municipal sludge in mountainous cities and the sludge was co-pyrolyzed with agricultural and forestry wastes including rice stalk,rice husk,eucalyptus brand and eucalyptus leaf.The effects of co-pyrolysis on the physicochemical properties and Cu(Ⅱ)adsorption properties of biochar were investiga-ted,and the synergistic effect of co-pyrolysis on Cu(Ⅱ)adsorption properties was discussed.The results showed that compared with sludge biochar,the C contents of biochar derived from co-pyrolysis of sludge with rice husk,rice stalk,eucalyptus branch and eucalyptus leaf were increased by 0.64 times,0.87 times,1.04 times and 1.22 times,respectively;the O contents were increased by 1.11 times,1.25 times,2.01 times and2.17 times,respectively;the maximum adsorption capacities of Cu(Ⅱ)were enhanced by 28.4％,60.3％,82.7％and 99.7％,respectively.Co-pyrolysis had a significant synergistic effect on the adsorption capacity of Cu(Ⅱ)on biochar,and the synergistic value of the maximum Cu(Ⅱ)adsorption capacity of biochar derived from co-pyrolysis of sludge with eucalyptus leaf was the highest(90.13％).
sludge treatment and disposalbiocharco-pyrolysissynergistic effectheavy metal adsorp-tion
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