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Petrochemical effluent treatment using natural coagulants and an aerobic biofilter
Bandala, Erick R.,Tiro, Juan Bernardo,Lujan, Mariana,Camargo, Francisco J.,Sanchez-Salas, Jose Luis,Reyna, Silvia,Moeller, Gabriela,Torres, Luis G. Techno-Press 2013 Advances in environmental research Vol.2 No.3
Coagulation-flocculation (CF) was tested coupled with an aerobic biofilter to reduce total petroleum hydrocarbon (TPHs) concentration and toxicity from petrochemical wastewater. The efficiency of the process was followed using turbidity and chemical oxygen demand (COD). The biofilter was packed with a basaltic waste (tezontle) and inoculated with a bacterial consortium. Toxicity test were carried out using Lactuca sativa var. capitata seeds. Best results for turbidity removal were obtained using alum. Considerable turbidity removal was obtained when using Opuntia spp. COD removal with alum was 25%, for Opuntia powder it was 36%. The application of the biofilter allowed the removal of 70% of the remaining TPHs after 30 days with a biodegradation rate (BDR) value 47 $mgL^{-1}d^{-1}$. COD removal was slightly higher with BDR value 63 $mgL^{-1}d^{-1}$. TPH kinetics allowed a degradation rate constant equal to $4.05{\times}10^{-2}d^{-1}$. COD removal showed similar trend with $k=4.23{\times}10^{-2}d^{-1}$. Toxicity reduction was also successfully achieved by the combined treatment process.
Nian Hong,Qin Cheng,Ashantha Goonetilleke,Erick R. Bandala,An Liu 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.89 No.-
This study investigated the role of surface hydrophobicity/hydrophilicity of biochar on its pollutantleaching potential (pollutants originally in biomass feedstock), including nutrients, organic matter andmetals, in water treatment applications. The study outcomes confirmed that biochar with greaterhydrophilic surface leached comparatively higher loads of nutrients and organic matter compared tobiochar with mostly hydrophobic surface, while biochar with greater hydrophilic surface leached lowermetal loads. This trend is attributed to the changes to the physical and chemical properties of biocharincluding specific surface area and surface functional groups, as well as being related to the binding forcesbetween the biochar surface and the different compounds. Further, the study results substantiated thesignificant influence of surface characteristics of biochar, and its preparation process on pollutantleaching potential. The study outcomes provide essential guidance on the appropriate use of biochar asan adsorbent in water treatment, including raw biomass selection and the production processes to beadopted.
Soroosh Mortazavian,Tammy Jones-Lepp,배지환,천동원,Erick R. Bandala,문재윤 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-
Biochar (BC) is an inexpensive and widely available carbon-based material with a variety of applications. Zero valent iron nanoparticles (nZVI), on the other hand, are highly reactive species. However,agglomeration and difficulty of separation from the treated media are the major reported drawbacksassociated with nZVI application for water treatment. In this study, BC was modified by a simple heattreatment,producing hydrophilic heat-treated biochar (HBC) with enhanced absorptive features, andwas impregnated with nZVI, producing BC/nZVI composite for efficient organic contaminant removal. Synthesis conditions of BC/nZVI composite were optimized by evaluating p-nitrosodimethylaniline(pNDA) bleaching efficiency of various BC/nZVI samples synthesized under different conditions of pH,ultrasonication amplitude, and iron concentration. Variously-synthesized HBCs were then used tosynthesize HBC/nZVI composites, and were characterized for surface morphology, surface chemistry, andelemental composition. The best-performing HBC/nZVI for pNDA bleaching was then used fortrichloroethylene (TCE) removal from water. Using HBC/nZVI or BC/nZVI composites, the pseudosecondorder modelfit indicated a chemisorption mechanism for organic contaminants removal. Using250 mg L 1 of the best-performing HBC/nZVI, an 88% TCE reduction (initial concentration of 40 mg L 1)was achieved after 20 min at pH = 3.0, with a rate of 3.318 g mg 1 min 1.
Biochar-supported nanomaterials for environmental applications
Oscar M. Rodriguez-Narvaez,Juan Manuel Peralta-Hernandez,Ashantha Goonetilleke,Erick R. Bandala 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
Immobilizing nanomaterials in highly porous, surface active, structurally stable biochar creates novelnanocomposites that combines the well-known advantages of both materials. The exceptionalcontaminant adsorption and/or catalytic degradation capabilities of these nanocomposites haveattracted the attention of the scientific community for possible use in environmental applications. Thispaper reviews the different methodologies for synthesizing biochar-supported nanomaterials, the keyphysical and chemical characteristics of these nanomaterials, and their performance in environmentalapplications, as well as identifies current knowledge gaps and potential directions for further researchand development.