Some studies on UASB bioreactors for the stabilization of low strength industrial effluents
TL;DR: The suitability of two stage biomethanation process using upflow anaerobic sludge blanket (UASB) bioreactors was studied for the treatment of low strength industrial effluents like rice mill wastewater as discussed by the authors.
Abstract: The suitability of two stage biomethanation process using upflow anaerobic sludge blanket (UASB) bioreactors was studied for the treatment of low strength industrial effluents like rice mill wastewater. Maximum VFA yield was 0.75 mg (as acetic acid) per mg of COD consumed at a flow rate of 25 ml/min. Hydraulic retention time (HRT) of 1 hr was found suitable for acidification process. In the methanogenic reactor, the overall BOD and COD reductions were 89% and 78% respectively at loading rate of 3 kg COD m−3 d−1, and HRT of 30 hrs. Gas yield in methanogenic reactor was 0.56 lits. per kg COD consumed which contains 62% v/v methane.
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TL;DR: More effective treatment of rice mill wastewater and higher energy recovery was demonstrated by earthen pot MFC as compared to MFC incorporated with PEM.
253 citations
Cites methods from "Some studies on UASB bioreactors fo..."
...using upflow anaerobic sludge blanket (UASB) reactor [23]....
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TL;DR: In this study, the utilization of potato-juice, the organic by-product from potato-starch processing, for biogas production was investigated in batch assay and in high rate anaerobic reactors.
117 citations
TL;DR: In this article, the effect of pH and fermentation time on bio-hydrogen production from acid and enzymatic hydrolyzed rice mill wastewater was investigated, using Enterobacter aerogenes and Citrobacter ferundii.
71 citations
TL;DR: The results showed that, all process variables have significant effect on the removal efficiencies of chemical oxygen demand and total suspended solids in rice mill wastewater.
55 citations
TL;DR: Current processes for curbing pollution and also reusing and recycling waste products are reviewed, finding novel techniques exist for converting waste products into energy and value-added products.
49 citations
Cites background from "Some studies on UASB bioreactors fo..."
...Rajesh et al. (1999) evaluated the performance of bioreactors for the remediation of rice mill wastewater....
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...2 L per kg of paddy (Rajesh et al., 1999)....
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...2886.24 70.2 BOD 2401.24 76.27 Choudhary et al., 2015 Biomethanation 2400 78 e e e Rajesh et al., 1999 Phytoremediation 1931 ± 212 79(RFP) BOD 1089 ± 122 85(RFPa) Mukherjee et al., 2015a 76(RFW) 83(RTWb) Microbial Fuel cells 2200e2050 96.5(MFC1) Lignin 80.3e87....
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References
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TL;DR: In this paper, the main results obtained with the process in the laboratory as well as in 6 m3 pilot plant and 200 m3 full-scale experiments are presented and evaluated in this paper.
Abstract: In recent years considerable effort has been made in the Netherlands toward the development of a more sophisticated anaerobic treatment process, suitable for treating low a strength wastes and for applications at liquid detention times of 3–4 hr. The efforts have resulted in new type of upflow anaerobic sludge blanket (UASB) process, which in recent 6 m3 pilot-plant experiments has shown to be capable of handling organic space loads of 15–40 kg chemical oxygen demand (COD)·m−3/day at 3–8 hr liquid detention times. In the first 200 m3 full-scale plant of the UASB concept, organic space loadings of up to 16 kg COD·m−3/day could be treated satisfactorily at a detention times of 4 hr, using sugar beet waste as feed. The main results obtained with the process in the laboratory as well as in 6 m3 pilot plant and 200 m3 full-scale experiments are presented and evaluated in this paper. Special attention is given to the main operating characteristics of the UASB reactor concept. Moreover, some preliminary results are presented of laboratory experiments concerning the use of the USB reactor concept for denitrification as well as for the acid formation step in anaerobic treatment. For both purposes the process looks feasible because very satisfactory results with respect to denitrification and acid formation can be achieved at very high hydraulic loads (12 day−1) and high organic loading rates, i.e., 20 kg COD·m−3/day in the denitrification and 60–80 kg COD·m−3/day in the acid formation experiments.
1,339 citations
TL;DR: In this article, an up-flow anaerobic sludge blanket reactor process was used to treat cheese whey effectively, achieving over 97% chemical oxygen demand reduction with a constant hydraulic retention time of 5 days.
74 citations
TL;DR: Propionate and acetate degradation studies indicated that the biomass in the methanogenic fluidized beds of the two-phase systems was more adapted to volatile acid degradation than the biomassIn single-and separated-phase anaerobic treatments of a high strength wastewater.
Abstract: Four fluidized bed reactors were used to evaluate single-and separated-phase anaerobic treatments of a high strength wastewater. Two reactors were fed with a synthetic wastewater, containing glucose as the primary carbon source, with a COD of 1.2 x 10(4) mg/L while the remaining pair were fed with a wastewater with a COD of 6000 mg/L. AT each influent strength, one fluidized bed reactor was operated as a single-phase system while the other was operated as a methanogenic reactor which was preceded by an acidification reactor in a separatedphase system. The reactors were operated under steady-state and variable process conditions. The separated-phase system consistently gave a better quality effluent with lower effluent suspended solids and total COD, and the methane yield was also improved. Under variable process conditions, the separated-phase system was inherently more stable and recovered more rapidly following a shock loading. Propionate and acetate degradation studies indicated that the biomass in the methanogenic fluidized beds of the two-phase systems was more adapted to volatile acid degradation than the biomass in the single-phase fluidized beds.
65 citations
"Some studies on UASB bioreactors fo..." refers background in this paper
...Bull et al. [ 11 ] observed that the two-stage system capable to take shock load....
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TL;DR: A five-month pilot study was conducted to examine the effectiveness of the upflow anaerobic sludge blanket (UASB) process for the treatment of effluent from a brewery in rural China.
Abstract: A five-month pilot study was conducted to examine the effectiveness of the upflow anaerobic sludge blanket (UASB) process for the treatment of effluent from a brewery in rural China. Results indicate that the process operated at 26°C could reduce over 89% of chemical oxygen demand (COD) and 92% of five-day biochemical oxygen demand (BOD\d5) from the brewery effluent, with a hydraulic retention time (HRT) of 13.3 hr and a COD loading rate of 4.9 kg COD/m³/day. The brewery effluent in this study on average contained 2,692 ppm COD and 1,407 ppm BOD\d5. The treated effluent on the other hand contained 295 ppm COD and 122 ppm BOD\d5; both of which could be further reduced should the suspended solids be more effectively removed. Overall, this process was operated satisfactorily and smoothly, as reflected by the constant effluent pH and gas production rate, as well as the consistently high degrees of reduction of COD and BOD\d5. Parameters such as sludge density, distribution of volatile suspended solids (VSS) and soluble COD in sludge bed, gas production rate, and nutrient levels are discussed.
45 citations
"Some studies on UASB bioreactors fo..." refers methods in this paper
...The UASB bioreactor has been applied effectively for the treatment of a variety of industrial wastewaters such as dairy effluents (Dhabadgaonkar et al. [2]), sugar beet and potato processing wastes (Lettinga et al. [1]), brewery effluents (Fang et al. [ 3 ]), cheese whey (Lo et al. [4]), solid food wastes (Agelier et al. [5]) and also for treatment of sewage (Arceivala [6])....
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