Research Article| October 01 1999 A Simple and Low Cost Technique for Determining the Granulometry of Upflow Anaerobic Sludge Blanket Reactor A. Laguna; Laguna *Depto de Biotecnología, Universidad Autónoma Metropolitana-Iztapalapa, Av. Michoacan y La Purisima, Col. Vicentina, 09340, México, D. F., P. 55 535, Mexico Search other works by this author on: This Site PubMed Google Scholar Ouattara; Ouattara **Université Ouagadougou, Départment Microbiologie et Biochimie, 03 B. 7021, Ouagadougou...

Three mesophilic bacteria (strains AMX 26B T , UR374_02 and 12-3 ) isolated respectively from an anaerobic digester, human urine urban riverside soil were characterized. Cells Gram-negative, motile, non-sporulating, straight to curved rods with one polar flagellum had a strictly respiratory metabolism O 2 as the preferential terminal electron acceptor. Phylogenetic analysis based on 16S rRNA gene sequences revealed that all strains clustered within Xanthomonadaceae branch of Proteobacteria ....

A thermophilic terephthalate-degrading methanogenic consortium was successfully enriched for 272 days in an anaerobic hybrid reactor, and the microbial structure characterized using terminal RFLPs, clone libraries fluorescence in-situ hybridization with rRNA-targeted oligonucleotide probes. All results suggested that Methanothrix thermophila-related methanogens, Desulfotomaculum-related bacterial populations Gram-positive low-G + C group, OP5-related were key members responsible...

Four techniques (microscope sizing, calculation from settling velocities, image and laser analysis) are available nowadays for determining the particle size distribution of upflow anaerobic sludge blanket (UASB) reactor sludge. These present however disadvantage being either tedious, imprecise or expensive hardly applicable in full scale treatment plants. There was then need a simple low cost technique. In this study, granulometry procedure based on manual humid sieving evaluated. It shown...

Spent caustic is a waste from oil refineries which difficult to treat and dispose of due its noxious properties such as high content in paraffins asphaltenes hydrocarbons form all sorts emulsions solutions, 5 18% free NaOH, up 35 g Cl-/L, phenol compounds, organic inorganic sulfur compounds. Its composition depends on the source fuel being desulfurated. This mixture very reactive therefore characterization dependent way sample handled. Samples have be collected cold storage container with no...

The use of a down-flow fluidized bed (DFFB) reactor for the treatment sulfate-rich synthetic wastewater was investigated to obtain insight into outcome sulfate reduction in biofilm attached plastic support under regime. Fine low-density polyethylene particles were used as developing within reactor. treated volatile fatty acids mixture acetate or lactate, propionate, and butyrate at different chemical oxygen demand (COD) ratios ranging from 1.67 0.67 (g/g). Organic loading rate changed 2.5 5...

A strictly aerobic, mesophilic bacterium, strain AMX 51T, was isolated from anaerobic digester sludge. Cells were Gram-negative, motile, non-sporulating, straight to curved rods with one polar flagellum. The isolate had phenotypic traits of the genus Bosea, including cellular fatty acid and substrate utilization profiles. Physiological characteristics antibiotic susceptibility determined. Phylogenetic analysis revealed that 51T a member α-Proteobacteria, most closely related Bosea...

This work presents the effect of ammonia nitrogen concentration and zeolite addition on specific methanogenic activity (SMA) different anaerobic sludges with various physical structures (granular flocculent), operating in batch conditions. Piggery, malting production urban derived from full-scale reactors were tested experiment as source inoculum digesters. It was found that piggery sludge most affected by increase while producing municipal less affected. In general, at doses range 0.01-0.1...

With 14.4 million tons produced in 1993, purified terephthalic acid (PTA) and dimethylterephthalate (DMT) are the main monomers used world polyester production. Even though there ten industrial digestors treating effluents of both products, little is known about influence their organic components, (TA), p-toluic (p-tol), benzoic (BA) phthalic (PA) acids as well 4-carboxybenzaldehyde (4-CBA) on methanogenesis. This study shows that concentrations 4-CBA, p-tol TA required to inhibit by 50%...

A low cost treatment alternative for cheese wastewater is discussed. The problem was to redesign three ponds which were operating below the consents. Discharge rate 500 m3/day with a high organic load (2,750 kg COD/day). new system consisted of: grease trap, an anaerobic UASB type pond, aerated pond and effluent polishing water hyacinth. Local technology used except aeration equipment. project done at capital investment (US$ 330,000) operational costs 0.55/m3) competitive current market...

Two different types of microbial aggregates (granular sludge and biofilm onto a plastic matrix) were evaluated for their susceptibility to sulphide dissolved oxygen. Their specific methanogenic sulphate reducing activities separately simultaneously. Total concentrations that caused 50% loss activity 800 1250 mg l(-1) reduction 750 860 the granular attached biomass, respectively. Simultaneous methanogenesis resulted in an increased tolerance process towards sulphide. Results suggest is less...

The effect of alkaline pretreatment waste-activated sludge, using two models to study the sequential hydrolysis rates suspended (Sanders' surface model) and dissolved (Goel's saturation solids, on mesophilic thermophilic anaerobic digestion rate is evaluated. pretreatment, which reduces size increases reaction by increasing area specific constant (K(SBK)); at conditions from 0.45 x 10(-3) kg m(-2) d(-1) for fresh sludge 0.74 pretreated these values are 0.28 0.47 confirming usefulness a...

Two-stage anaerobic digestion of the organic fraction municipal solid waste (OFMSW) was carried out: hydrolysis and acidogenesis in a continuous hydrolytic leach bed (AHLB) reactor loaded at different rates (Bv = 3.8–7 gVSSL−1d−1) methanogenesis leachates, diluted with wastewater an upflow sludge blanket (UASB) loading 6.6–13 gCODLr−1d−1. In AHLB reactor, 51–76% 58–71% volatile solids chemical oxygen demand (COD) removal efficiencies were obtained. During phases, effluents pH 4.93, leachate...

Abstract An approach for the design of linear feedback controllers anaerobic digestion systems is presented. The effluent chemical oxigen demand (COD) concentration and dilution rate are taken respectively as regulated manipulated variables. control based on simple step‐response models process endowed with an input delay to account dead‐times induced by measurement devices. resulting controller has a traditional proportional‐integral (PI) structure, so it can be easily implemented...

The degradation of lineal alkylbenzene sulphonate (LAS) was studied in a two-stage anaerobic system where the acidogenic reactor bioaugmented with strain Pseudomonas aeruginosa (M113). This is strain, which under aerobic and denitrifying conditions uses LAS as carbon source. Results show that only degraded within stage while methanogenic there no eventually an inhibition due to accumulation sludge. During experiment, M113 remained conglomerate (at around 10(4) CFU/mL) although evidence their...

Low concentration synthetic and municipal wastewaters were treated at HRT as short 3 0.6 h respectively in an anaerobic inverse fluidized bed. Both bioreactors showed gas hold up due to the liquid downflow pattern of prototype. The bioreactor operated had a removal efficiency 83%, specific activity 4.5 kg CODremoved/kg IVS (d varied from 23 55%. reactor treating wastewater 44% when operating h, was 4.2 no biogas detected apparently because important fraction dissolved phase. biomass 13.8 1.1...