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Enhanced biological wastewater treatment using sodium alginate-immobilized microorganisms in a fluidized bed reactor

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Water Science and Engineering 2022年第2期15卷 125-133页

作者： Yaneth A.Bustos-Terrones erick R.bandala Gabriela E.Moeller-Chávez Victoria Bustos-Terrones Division of Graduate Studies and Research CONACYT-TecNM-Technological Institute of CuliacánCuliacánSinaloa 80220Mexico Division of Hydrologic Sciences Desert Research InstituteLas VegasNV 89119-7363USA Academic Direction of Environmental Technology Engineering Polytechnic University of the State of MorelosJiutepecMorelos 62550Mexico

In this study,a microbial consortium isolated from an activated sludge tank of a conventional wastewater treatment plant was immobilized using sodium alginate(SA)as a support material for contaminant biodegradation in wastewater.A volume of 500 mL of activated sludge was immobilized in the SA beads(with a mass concentration of 25 g/L).The resulting SA beads were characterized,introduced into a fluidized bed reactor,fed with 1000 mL of the sample,and characterized again after the treatment *** SA-immobilized microorganisms were tested first for degradation of organic matter(expressed as chemical oxygen demand)and total phosphorous in domestic wastewater,achieving removal efficiencies of 71%and 93%,respectively,after 12 ***,the SA-immobilized microorganisms were tested for degradation of a basic blue 9(BB9)textile dye in a condition that simulated textile *** efficiency of the BB9 degradation was found to be as high as 99.5%after 2 *** to these results,SA-immobilized microorganisms were found to be an environmentally friendly and cost-effective alternative for treatment of municipal and industrial wastewater effluents.

关键词： Domestic wastewater Basic blue 9 Immobilized microorganisms Fluidized bed reactor Sodium alginate

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Peroxymonosulfate decomposition by homogeneous and heterogeneous Co: Kinetics and application for the degradation of acetaminophen

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Journal of Environmental Sciences 2020年第7期32卷 30-40页

作者： Oscar M.Rodríguez-Narvaez Ruwini D.Rajapaksha Mahinda I.Ranasinghe Xuelian Bai Juan Manuel Peralta-Hernández erick R.bandala Departamento de Química DCNEUniversidad de GuanajuatoGuanajuato C.P.3C6040Mexico Department of Chemistry New Mexico Institute of Mining and TechnologySocorroNM 87801USA Division of Hydrologic Sciences Desert Research InstituteLas VegasNV 89119-7363USA

Peroxymonosulfate(PMS)decomposition,hydroxyl radical(·OH)generation,and acetaminophen(ACT)degradation by the Co/PMS system using homogeneous(dissolved cobalt)and heterogeneous(suspended Co3O4)cobalt were *** the homogeneous process,>99%PMS decomposition was observed and 10 mmol/L of·OH generation was produced using 5 mmol/L of PMS and different dissolved cobalt concentrations after 30 min.A dissolved cobalt concentration of 0.2 mmol/L was used to achieve>99%ACT degradation using the homogeneous *** the heterogeneous process,60%PMS decomposition and negligible·OH generation were observed for 5 mmol/L of the initial PMS concentration using 0.1 and 0.2 g/L of *** of ACT greater than 80%was achieved for all experimental runs using 5 mmol/L of the initial PMS concentration independently of the initial Co3O4 load *** the heterogeneous process,the best experimental conditions for ACT degradation were found to be 3 mmol/L of PMS and 0.2 g/L of Co3O4,for which>99%ACT degradation was achieved after 10 *** negligible·OH was produced by the Co3O4/PMS process,a second-order kinetic model was proposed for sulfur-based free radical production to allow fair comparison between homogeneous and heterogeneous *** the kinetic data and the reaction by-products identified,a mechanistic pathway for ACT degradation is suggested.

关键词： Co3O4 PMS decomposition Fenton-like reaction Acetaminophen ·OH production

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Disinfection of Primary Municipal Wastewater Effluents Using Continuous UV and Ozone Treatment

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Journal of Water Resource and Protection 2014年第1期6卷 16-21页

作者： Yaneth Bustos Mabel Vaca Raymundo López erick bandala Luis Torres Neftalí Rojas-Valencia Departamento de Energía Ciencias Básicas e Ingeniería Universidad Autónoma Metropolitana Azcapotzalco México Departamento de Ingeniería Civil y Ambiental Universidad de las Américas Puebla. Sta. Catarina Mártir Cholula México Unidad Profesional Interdisciplinaria de Biotecnología Instituto Politécnico Nacional México D. F. México Universidad Nacional Autónoma de México Instituto de Ingeniería Coordinación de Ingeniería Ambiental México D. F. México

UV radiation and ozonation were investigated as disinfection alternatives for the wastewater treatment plant. The inactivation of total and fecal coliforms using ozone and ultraviolet radiation as separate treatments was evaluated. Different ozone concentrations (3 to 40 mg O3/L) were applied and UV fluencies ranging from 8.5 to 12 mJ/cm2 at different pH values (from 5 to 9) were tested. Best results were obtained for ozone doses near 20 mg/min with removals of 72% and 78% of fecal and total coliforms, respectively. The ozone also was capable of oxidizing organic matter in the effluent measured as COD (the highest removal obtained was 36% for 20 mg O3/min). Maximum bacterial resistance was observed at pH 7 in both cases. The UV light offered a high bacterial inactivation (over 80%) and the lowest bacterial inactivation was observed at pH 7. Finally, we obtained the electric energy per order (EEO, kWh/m3/order), defined as the electric energy (kW-h) required to degrade a contaminant by one order of magnitude in a unit volume of contaminated water, being noteworthy that EEO values for the UV process resulted were lower than those determined for the process with ozone in all the water flow tested.

关键词： Disinfection Ozone Treatment UV Treatment Wastewater

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Surfactant-Enhanced Washing of Soils Contaminated with Wasted-Automotive Oils and the Quality of the Produced Wastewater

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Journal of Environmental Protection 2013年第12期4卷 1495-1501页

作者： Montserrat Zacarias-Salinas Mabel Vaca Miguel A. Flores erick R. bandala Luis G. Torres Departamento de Ingeniería Civil y Ambiental Escuela de Ingeniería Universidad de las Américas-Puebla. Sta. Catarina Mártir Cholula Puebla México Laboratorio de Calidad de Agua y Residuos Universidad Autónoma Metropolitana-Unidad Azcapotzalco México UPIBI-Instituto Politécnico Nacional. Av. Acueducto s.n. Colonia Barrio la Laguna Ticomán. México DF México

An old automotive industrial site located at Mexico City with many years of operation and contaminated with heavy oil hydrocarbons, particularly spent oils, was assessed for restoration using the surfactant enhanced soil washing (SESW) process. The main goal of this study was to characterize the contaminated soil in terms of TPHs, BTEX, PAHs, and metals contents as well as microbiologically (total heterotrophs and specific degrading microorganisms). We also aimed to determine the surfactant type and concentration to be used in the SESW process for the automotive waste oil contaminated soil. At the end, sixteen kg of contaminated soil were washed and the produced wastewater (approximately 40 L) was characterized in terms of COD, BOD;solids, and other physico-chemical parameters. The soil contained about 14,000 mg of TPH/kg soil (heavy fraction), 0.13 mg/kg of benzo (k) fluoranthene and 0.07 mg/kg of benzo (a) pyrene as well as traces of some metals. Metals concentrations were always under the maximum concentration levels suggested by Mexican regulations. 15 different surfactants were used to identify the one with the capability to achieve the highest TPH removal. Surfactants included 5 anionics, 2 zwitterionic, 5 nonionics and 3 natural gums. Sulfopon 30 at a concentration of 0.5% offered the best surfactant performance. The TPH removals employing the different surfactants were in the range from 38% to 68%, in comparison to the soil washing with water (10% of TPH removal). Once the surfactant was selected, 70 kg of soil were washed and the resulting water contained approximately 1300 mg/L of COD, 385 mg/L of BOD (BOD/COD = 0.29), 122 mg/L of MBAS, and 212 mg/L of oil and greases, among other contaminants.

关键词： Wasted Automotive Oils Surfactants Soil Washing Waste Water

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