The performance of a continuously operated flocculent sludge UASB reactor with slaughterhouse wastewater

Mesophilic and thermophilic anaerobic digestion of biologically pretreated abattoir wastewaters in an upflow anaerobic filter

“…The success of the technology thus depends on an efficient primary treatment to reduce fats and suspended solids. Many studies have shown that the form of pollutants (suspended, colloidal or soluble) in the influent wastewater greatly affects the performance of high-rate anaerobic systems [9]. Removing solids before treatment becomes a common practice to remove solids, so that only the soluble part of the wastewater with perhaps small amounts of residual solids (up to 500 mg/L) is admitted to the digester without any problems related to clogging of solids [10].…”

The influence of influent distribution and blood content of slaughterhouse wastewater on the performance of an anaerobic fixed‐film reactor

“…19,20 In any case, the anaerobic fixedfilm reactor presented in this paper withstood OLRs of up to 10.7 kg COD m −3 d −1 at 20 • C, achieving COD removal rates up to 6 kg COD m −3 d −1 , without showing any symptom of acidification due to the accumulation of volatile fatty acids, which would be indicative of an overloaded anaerobic system, even more at low temperatures. 3,15,21 These results were better than those achieved at low temperatures with random media anaerobic filters, which reached efficiencies of 55% at 21 • C for OLR of 4 kg COD m −3 d −1 , 12 reaching 11.5 kg COD m −3 d −1 at 25 • C. 22 However, for slowly biodegradable wastewaters such as from a slaughterhouse, similar efficiencies have only been achieved for OLR of 0.6 kg COD m −3 d −1 at 24 • C with random filters, 23 for OLR of 7 kg COD m −3 d −1 with up-flow anaerobic sludge blanket reactors at 20 • C, 24 and for OLR of 2.7 kg COD m −3 d −1 in anaerobic sequencing batch reactors at 20 • C. 25 Figure 5 shows the organic matter removal rate (r COD ) and the biogas production (Q G ) as a function of the bulk substrate concentration (COD E ).…”

Anaerobic Treatment of Slaughterhouse Wastewater: Evaluating Operating Conditions

“…Sayed and DeZeeuw [12] in their study stated that the consequence of treating complex wastewater is that a significant decrease in the methanogenic capacity of the AD process could occur as a result of the coarse non-biomass suspended solids being trapped from the wastewater in the sludge. The entrapment of inert suspended solids could lead to a dilution effect of the active biomass thereby leading to a severe decrease in the methanogenic bacterial concentration in the sludge and formation of scum at the liquid interphase in the settler compartment.…”