Adsorption characteristics of benzene on biosolid adsorbent and commercial activated carbons.
This study selected biosolids from a petrochemical waste-water treatment plant as the raw material. The sludge was immersed in 0.5-5 M of zinc chloride (ZnCl2) solutions and pyrolyzed at different temperatures and times. Results indicated that the 1-M ZnCl2-immersed biosolids pyrolyzed at 500 degrees C for 30 min could be reused and were optimal biosolid adsorbents for benzene adsorption. Pore volume distribution analysis indicated that the mesopore contributed more than the macropore and micropore in the biosolid adsorbent. The benzene adsorption capacity of the biosolid adsorbent was 65 and 55% of the G206 (granular-activated carbon) and BPL (coal-based activated carbon; Calgon, Carbon Corp.) activated carbons, respectively. Data from the adsorption and desorption cycles indicated that the benzene adsorption capacity of the biosolid adsorbent was insignificantly reduced compared with the first-run capacity of the adsorbent; therefore, the biosolid adsorbent could be reused as a commercial adsorbent, although its production cost is high.
Chiang
Hung-Lung
HL
Department of Risk Management, China Medical University, Taichung, Taiwan. hlchiang@mail.cmu.edu.tw
Lin
Kuo-Hsiung
KH
Chen
Chih-Yu
CY
Choa
Ching-Guan
CG
Hwu
Ching-Shyung
CS
Lai
Nina
N
D000327:Adsorption; D001554:Benzene / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D002712:Chlorides / Q000737:chemistry*; D007220:Industrial Waste; D010578:Petroleum; D016062:Porosity; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical; D018508:Water Purification / Q000379:methods*; D017967:Zinc Compounds / Q000737:chemistry*
D002712:Chlorides; D007220:Industrial Waste; D010578:Petroleum; D012722:Sewage; D014874:Water Pollutants, Chemical; D017967:Zinc Compounds; D002244:Carbon; C016837:zinc chloride; D001554:Benzene