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Search Results: 1 - 10 of 15191 matches for " Anaerobic treatment "
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Anaerobic Membrane Bioreactor as Highly Efficient and Reliable Technology for Wastewater Treatment—A Review  [PDF]
Meenu Jain
Advances in Chemical Engineering and Science (ACES) , 2018, DOI: 10.4236/aces.2018.82006
In this review paper, Anaerobic Membrane Bioreactor (AnMBR) is considering as highly efficient and reliable technology for organic material removal from wastewater with no additional energy requirement for aeration. AnMBR is a combination of conventional anaerobic technology and modern membrane system. AnMBR is cost effective alternative technology with pros of anaerobic microbial activity because Methogenic microorganism can convert organic pollutant load of wastewater into renewable energy in the form of methane rich biogas, this conversion is mainly done by transformation of organic matter into energy by high chemical oxygen demand (COD), total suspended solid (TSS) and pathogens removal. Methane rich biogas can be used as a storable source of supplemental energy for the production of heat or power thus AnMBR technology provides improved effluent quality, reliability, and efficiency over the other traditional technologies. This review paper is included the overview of AnMBR, the advantages over other wastewater treatment technology, operational constraints and the concerned factors that has affected the performances of implemented systems, applications of AnMBR for various types of wastewaters, research and development summary and future perspective for further research.
Balan?o de massa de reatores anaeróbicos de fluxo ascendente com manta de lodo (UASB) tratando águas residuárias de suinocultura
Oliveira, Roberto A. de;Foresti, Eugênio;
Engenharia Agrícola , 2004, DOI: 10.1590/S0100-69162004000300035
Abstract: the mass balance was acquired out in order to determinate the mean values of chemical oxygen demand (cod) and methane (ch4) production from two uasb reactors treating swine wastewater subjected to distinct operational conditions in respect to concentrations of total suspended solids of the affluent (tss of 500; 1,000; 1,500 and 2,000 mg l-1), hydraulic detention time (hdt of 30; 20; 12 and 8 h), volumetric organic loading rates (volr of 0.8 to 8.0 kg cod (m3 d)-1) and temperature (ambient, 25 oc and 30 oc). it was verified that values of total cod removed and converted in ch4 varied from 28 to 51% and the ratio values of cod-ch4 by removed and dissolved cod varied from 0.94 to 2.07; indicating a high participation of physical removal (49 to 72%) of the affluent solids in the process. the tss concentrations, temperature, hdt and volr influenced the uasb reactors performance.
The Effects of Microwave Pretreatment of Dairy Manure on Methane Production  [PDF]
Ian Chan, Asha Srinivasan, Ping H. Liao, Kwang V. Lo, Donald S. Mavinic, Jim Atwater, James R. Thompson
Natural Resources (NR) , 2013, DOI: 10.4236/nr.2013.43031

This study was undertaken to evaluate the efficiency of a liquid-solids separation process and microwave pretreatment, as well as anaerobic biodegradability of microwave pretreated dairy manure. Liquid-solids separation of raw dairy manure resulted in solid and liquid fractions having different properties, with the solid fractions richer in total and volatile solids content and liquid fractions richer in nutrients and metal ions. Substantial amounts of soluble chemical oxygen demand and nutrients were released into the solution after the microwave treatment. The microwave pretreated dairy manure was also subjected to anaerobic digestion. The kinetic parameters of methane production potential, maximum methane production rate and lag time were determined using the modified Gompertz equation. Anaerobic digestion of liquid manure, without microwave treatment, outperformed the sets with microwave treatment. The microwave-treated liquid dairy manure, without acid addition had better results in terms of methane potential and methane production, than with acid addition. Thermophilic digestion exhibited a higher maximum methane production rate than that of mesophilic digestion, but lower methane yields. The microwave pretreatment of dairy manure resulted in high soluble chemical oxygen demand; however, methane yield was not increased.

Produ??o de biogás no tratamento dos efluentes líquidos do processamento de Coffea arabica L. em reator anaeróbico UASB para o potencial aproveitamento na secagem do café
Prado, Marco Ant?nio Calil;Campos, Cláudio Milton Montenegro;
Ciência e Agrotecnologia , 2008, DOI: 10.1590/S1413-70542008000300035
Abstract: it was studied the biogas production through the treatment of the wet processing coffee wastewaters (arc) in an anaerobic treatment system in laboratorial scale. the system used was composed by one acidification and equalization tank (tae), one anaerobic upflow sludge blanket reactor (uasb), one facultative aerated pond, one equalization tank and one gas tank. the treatment was carried out for 190 days and the ph was controlled for some periods by adding naoh inside of the tae or in the uasb. in the uasb reactor the maximum and minimum values obtained in the inlet were 235 to 7064 mg.l-1 for cod; 200 to 3913 mg.l-1 for bod5, 500 to 11.153 mg.l-1 for tvs and 4,57 to 7,75 for ph. in the outlet of the uasb, the values were 39 to 2333 mg.l-1 for cod; 15 to 1300 mg.l-1 for bod5, 272 to 2749 mg.l-1 for tvs and 6,16 to 7,93 for ph. the minimum and maximum values of the inlet flow were 0,18 to 1,56 l.h-1. the biogas presented a theoretical production of the 0,545 to 0,602 m3.kg-1bod5 and methane percentage from 48,60 to 68,14%.
Avalia??o físico-química de efluente gerado em biodigestor anaeróbio para fins de avalia??o de eficiência e aplica??o como fertilizante agrícola
Silva, Wilson Tadeu Lopes da;Novaes, Antonio Pereira de;Kuroki, Vivian;Martelli, Lilian Fernanda de Almeida;Magnoni Júnior, Louren?o;
Química Nova , 2012, DOI: 10.1590/S0100-40422012000100007
Abstract: the use of biodigester for basic and environmental sanitation has large demand in brazil. a biodigester was built to treat conjunctly the human and pig feces and urine, regarding to its future application in rural small towns. the results show that the biodigester can reduce 90% of cod and bod and, up to 99.99% of thermotolerant coliforms. the treated effluent has variable quantities of macro- and micro-nutrients; and organic matter. however, the concentration variability of the nutrients makes difficult a dosed application into soil. the soluble salts (mainly as na+ form) make necessary a controlled use to avoid environmental degradation.
Evaluación del arranque y puesta en marcha del sistema de tratamiento de aguas residuales de una empresa tabacalera
Revista de la Facultad de Ingeniería Universidad Central de Venezuela , 2006,
Abstract: the aim of this work is to evaluate the setting up of a wastewater treatment plant in a tobacco company. it was carried out through the identification of the factors that lead to an increase in the levels of nitrogen and phosphorus; the study of the equipment and units that make up the treatment plant; the characterization and analysis of the waters of the treatment process, the latter through the curves of the nitrogen and phosphorus level behavior; the calculation of the treatment system efficiency; and lastly, an evaluation to verify that the nitrogen and phosphorus levels upon leaving the system fulfill environmental requirements. this study was developed in the facilities of a tobacco company, located in camburito, aragua, in its wastewater treatment plant. among the most important conclusions obtained from the study of characterization carried out during the initial stage of stabilization of the plant, was that the failure to extract mud in the sedimentation cones was the main cause of the high ages of the mud, that ranged between 24 and 122 days, considerably above the design value of 10,5 days, and the nitrogen and dbo levels behavior during the month of march which showed that the implemented system to eliminate these parameters in its initial stage was being carried out under conditions for which it was designed: the obtained efficiencies of removal are 98,7 ± 0,2 % for the biochemical demand of oxygen, 92 ± 4 % for the chemical demand of oxygen; 60 ± 20 % for nitrogen and of 48 ± 18 % for phosphorus.
Petrochemical Wastewater Treatment Using an Anaerobic Hybrid Reactor
M.T. Jafarzadeh,N. Mehrdadi,A.A. Azimi,S.J. Hashemian
Pakistan Journal of Biological Sciences , 2006,
Abstract: Performance of an anaerobic hybrid reactor (UASB/Filter) treating petrochemical wastewater at mesophilic condition was investigated. The reactor was seeded with flocculent sludge from a UASB plant treating dairy wastewater. The sludge was acclimatized to petrochemical wastewater in two-stage operation. After 39 weeks, a COD reduction of 70.3% was obtained at OLR = 2.0 kg m-3.day and HRT = 18 h. During the reactor operation, the influent COD concentration was kept between 1000-4000 mg L-1 range and the organic loading rates and hydraulic retention times ranging between 0.5-24.0 kg COD m-3 day, respectively. The performance of the different sections of the reactor (sludge bed and fixed bed) was evaluated and is presented separately. The minimum and maximum COD reduction of the overall reactor were 42.1 and 85.9% at influent COD concentration of 3000 mg L-1 and 4000 mg L-1, HRT = 24 h and 4h, and OLR = 3.0 kg m-3 day and OLR = 24.0 kg m-3 day, respectively.
Avalia??o da eficiência do reator UASB tratando efluente de laticínio sob diferentes cargas organicas
Campos, Cláudio Milton Montenegro;Luiz, Fátima Aparecida Resende de;Botelho, Cláudio Gouvêa;Damasceno, Leonardo Henrique Soares;
Ciência e Agrotecnologia , 2004, DOI: 10.1590/S1413-70542004000600021
Abstract: in this research it was evaluated the performance of a laboratory scale uasb reactor (upflow anaerobic sludge blanket) treating a simulated dairy wastewater. in order to obtain the same concentration of an ordinary dairy, in terms of cod substrate, it was carried out the dilution of type b pasteurized milk with drinking water at a mean concentration of 2,500 mg.l-1, similar to a dairy wastewater without milk serum. during 205 days of operation the reactor was evaluated considering the efficiency related to the organic loading rate, which varied according to the hydraulic detention time applied. the uasb reactor was operated at different hydraulic retention times, of about 12, 20, 18 and 16 hours. the initial (start-up) biological organic loading rate was about 0,054 kg dbo. kg tvs-1.d-1. the observed removal efficiencies of organic matter in terms of cod (chemical oxygen demand), were about 24, 43, 52 and 39%, whereas, the removal of ts (total solids) were about 22, 22, 17 and 17%, concerning to the respectively application of hydraulic detention times. the best results related to the removal of organic matter were obtained with the hydraulic retention time (hrt) of 20 and 18 hours. under the applied temperature, the volumetric loading rate and hydraulic retention time, the reactor demonstrated good condition of buffering and efficiency.
Comparative study of thermophilic and mesophilic anaerobic treatment of purified terephthalic acid (PTA) wastewater  [PDF]
Michael O. Daramola, Elizabeth F. Aransiola, Adeniyi G. Adeogun
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.35050
Abstract: The paper provides a critical comparison between mesophilic and thermophilic anaerobic treatment of PTA wastewater through diagnosis of a case study. Aspects covered are bioavailability, biodegradability, microbial population, thermodynamics, kinetics involved and bio-reactor design for PTA wastewater treatment. The results of the case study suggests that one- stage thermophilic anaerobic reactor coupled with coagulation-flocculation pre-treatment unit and an aerobic post treatment unit could be techno-economically viable for PTA wastewater treatment to ensure that the final effluent quality conforms to the international standard. The in-formation emanated from this study could be useful and thought provoking to the professionals and academia in the area of PTA wastewater treatment and can serve as impetus toward the development of research lines in similar problems like the treatment of other petrochemical wastewater such as phenol-con- taining wastewater, benzene/benzoic acid-con- taining wastewater or wastewater from other similar industrial settings.
Performance of anaerobic sequencing batch reactors (pilot-scale) in domestic sewage treatment
Arnaldo Sarti,Marcelo Zaiat,Eugenio Foresti
Semina : Ciências Exatas e Tecnológicas , 2005,
Abstract: This study shows the results obtained during 70 days using four pilot scale anaerobic sequencing batch reactors, for sewage system treatment of the campus of the University of S o Paulo in S o Carlos – SP. Each reactor system with 1.2 m3 of total volume, was designed for the treatment of 1.95 m3d3 of domestic sewage, with geometrical conceptions (ratio H-height/D-diameter), mechanical conceptions (mechanical mixing or liquid re-circulation) and different biomass retention type. Three of them were ASBR (AnaerobicSequencing Batch Reactor) with granular biomass and another one was an ASBBR (Anaerobic Sequencing Batch Biofilm Reactor) with biomass consisting of cubic matrices of polyurethane foam. The reactors were inoculated and operated within an 8-hour batch cycle. The reactors monitoring included the oxygen chemical demand (OCD), pH, total suspended solids (TSS) and volatile suspended solids, volatile fatty acids, alkalinity to bicarbonate and methane concentration. Both ASBR reactors with liquid re-circulation did not show a satisfactory performance. The average values of OCD and TSS removal were close to 40% and 60% respectively. In the ASBR reactors with mechanical mixing and ASBBR with immobilized biomass, showed better results. The ASBBR reactor reached average efficiency of 61% and 75% in OCD and TSS removal, while in the ASBR with mechanical mixing, it reached 60% and 79%, respectively.
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