UASB Process Design for Various Types of Wastewaters

Proc. IAWPRC Int. Specialized Workshop, Valladolid, 1990. Water Sci. Technol. 24,8 (1991) 87-109 01/1991; 24(8).
Source: OAI


In this paper the design of UASB-reactors is discussed for different types of wastewater, viz. industrial soluble non-complex wastewaters, SS-rich complex wastewaters and domestic sewage. The paper not only deals with the UASB-reactor design, but also with other treatment steps, pre- as well as post-treatment, that are required for as complete as possible overall wastewater purification.

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    • "The sludge production is also minimal, and additional important benefit is that the anaerobic sludge can be preserved while not being fed for long periods of time at temperature below 15 °C [1]. The feasibility of the up flow anaerobic sludge blanket reactors UASB for adequate sewage treatment has been investigated since 1980 at both pilot and full scale installations [2], but at the moment, it is largely restricted to countries with a relatively cold climate [3]. The anaerobic fluidized bed and the expanded granular sludge bed reactors, with HRTs of about 2–4 h [4] and the UASB reactor, with an HRT of 4–8 h [5] offer good results, while the attached growth process named anaerobic filter needs a longer HRT on assuming constant organic loading rates for all systems. "
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    ABSTRACT: The fluidized bed UASB performance was studied in this experiment as a primary unit the anaerobic unit the advantage of better generated sludge characteristics and smaller tank volume.
    04/2015; 24. DOI:10.1016/j.hbrcj.2014.09.003
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    • "The highlights of UASB include high organic loading rates (OLRs), low operational costs, and energy recovery in the form of methane. UASB reactors are especially preferred for treating highly polluted industrial wastewaters because of their high chemical oxygen demand (COD) removal capacity (Lettinga and Hulshoff Pol, 1991; Rajeshwari et al., 2000). However, the effluent from the UASB treatment of such high-strength industrial wastewater still contains high concentrations of organic compounds. "
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    ABSTRACT: This study evaluated the performance of a novel treatment system consisting of an upflow anaerobic sludge blanket (UASB) and a downflow hanging sponge (DHS) for the treatment of industrial wastewater containing 8% ethylene glycol and 2% propylene glycol discharged from a rubber production unit. The system achieved high COD removal (91 ± 4.3%) and methane recovery (82 ± 20%) at an organic loading rate of 8.5 kg-COD/(m3•day). The UASB allowed an organic loading rate of 14 kg-COD/(m3•day) with a constant hydraulic retention time of 24 h. The COD of DHS effluent was 370 ± 250 mg-COD/L during the entire experimental period. Thus, the proposed system could be applicable for treating industrial wastewater containing ethylene glycol. Massively parallel 16S rRNA gene sequencing elucidated the microbial community structure of the UASB. The dominant family Pelobacteriaceae could mainly degrade the organic compounds of ethylene glycol and decomposed products of ethanol. In Archaea, the hydrogenotrophic methanogen family Methanobacteriaceae was predominant in UASB granular sludge.
    Journal of Water and Environment Technology 01/2015; 13(2):131-140. DOI:10.2965/jwet.2015.131
    • "Anaerobic digestion processes are state of the art for the treatment of industrial wastewaters and UASB reactors are commonly used in case of mainly soluble wastewaters (Lettinga and Hulshoff Pol, 1991). However, these plants do often not operate at their optimal levels as the anaerobic processes are rather sensitive in regard to variations of boundary conditions like pH, temperature, nutrients, loading rates (Austermann-Haun et al., 1999) and flow conditions (Vavilin et al., 2007). "
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    ABSTRACT: A laboratory plant consisting of two UASB reactors was used for the treatment of industrial wastewater from the wheat starch industry. Several load tests were carried out with starch wastewater and the synthetic substrates glucose, acetate, cellulose, butyrate and propionate to observe the impact of changing loads on gas yield and effluent quality. The measurement data sets were used for calibration and validation of the Anaerobic Digestion Model No. 1 (ADM1). For a precise simulation of the detected glucose degradation during load tests with starch wastewater and glucose, it was necessary to incorporate the complete lactic acid fermentation into the ADM1, which contains the formation and degradation of lactate and a non-competitive inhibition function. The modelling results of both reactors based on the modified ADM1 confirm an accurate calculation of the produced gas and the effluent concentrations. Especially, the modelled lactate effluent concentrations for the load cases are similar to the measurements and justified by literature.
    Water Research 11/2014; 64:82–93. DOI:10.1016/j.watres.2014.06.044 · 5.53 Impact Factor
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