UASB process design for various types of wastewaters. Water Sci Technol

Proc. IAWPRC Int. Specialized Workshop, Valladolid, 1990. Water Sci. Technol. 24,8 (1991) 87-109 01/1991; 24(8).
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ABSTRACT 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
    • "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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    • "Pig manure separates spontaneously into such distinct layers as seen in Figure 1, implying that potentially suitable high rate AD feed can be taken out from the middle layer at no extra cost. The middle layer may not be best for AD in general, but it is best for sludge bed based HRAD since such reactors require a feed with relatively low particle content and/or low viscosity to avoid losing the culture by flushing out the sludge bed [9]. "
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    ABSTRACT: The idea that storage can enhance manure quality as substrate for anaerobic digestion (AD) to recover more methane is evaluated by studying storage time and temperature effects on manure composition. Volatile fatty acids (VFA) and total dissolved organics (CODs) were measured in full scale pig manure storage for a year and in multiple flasks at fixed temperatures, mainly relevant for colder climates. The CODs generation, influenced by the source of the pig manure, was highest initially (0.3 g COD L(-1)d(-1)) gradually dropping for 3 months towards a level of COD loss by methane production at 15°C. Methane emission was low (<0.01 g COD L(-1)d(-1)) after a brief initial peak. Significant CODs generation was obtained during the warmer season (T > 10°C) in the full scale storage and almost no generation at lower temperatures (4-6°C). CODs consisted mainly of VFA, especially acetate. All VFAs were present at almost constant ratios. The naturally separated manure middle layer without sediment and coarser particles is suitable for sludge bed AD and improved further during an optimal storage time of 1-3 month(s). This implies that high rate AD can be integrated with regular manure slurry handling systems to obtain efficient biogas generation.
    BioMed Research International 08/2014; 2014:712197. DOI:10.1155/2014/712197 · 3.17 Impact Factor
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