Treatment of tomato processing wastewater by an upflow anaerobic sludge blanket–anoxic–aerobic system

A fuzzy-logic-based model to predict biogas and methane production rates in a pilot-scale mesophilic UASB reactor treating molasses wastewater

“…During the experimental study, influent alkalinity ranged from 240 to 1940 mg CaCO 3 /L, and the average increase in alkalinity across the UASB reactor was determined to be about 1280 mg CaCO 3 /L. The increase in alkalinity can be ascribed to the degradation of proteins in molasses wastewater by anaerobic treatment, which resulted in generation of alkalinity due to the reaction of ammonia with carbon dioxide and water, as similarly reported by others [40,76]. Alkalinity increase in the UASB reactor averaged about 0.20 mg CaCO 3 /mg TCOD removed during the continuous experimental period.…”

“…Alkalinity increase in the UASB reactor averaged about 0.20 mg CaCO 3 /mg TCOD removed during the continuous experimental period. This is comparable to the value of 0.17 mg CaCO 3 /mg TCOD removed reported by Gohil and Nakhla [40]. The stability of the anaerobic system was also monitored using the ratio of VFA:alkalinity.…”

“…After the acclimatization of seed culture, the dilution ratio was gradually decreased from 1:10 to 1:3 to increase organic loading rate (from about 2 to 17 kg TCOD/m 3 -day) and to study the effects of different feed strengths on the digestion performance of the reactor. Since molasses wastewater is characterized by moderately acidic [4], the pH of the feed wastewater was adjusted by the gradual addition of NaHCO 3 (Merck Chemical Corp.), as similarly conducted by Gohil and Nakhla [40]. A nutrient solution/basal media containing essential micro and macro nutrients for an optimum anaerobic microbial growth was also prepared with the following components, and added 1 mL/L of the daily fed subtrate at relatively high organic loading conditions [41]: 5 g/L MgSO 4 ·7H 2 O, 6 g/L FeCl 2 ·6H 2 O, 10 g/L CoCl 2 ·6H 2 O, 1 mg/L H 3 BO 3 , 1 mg/L ZnSO 4 ·7H 2 O, 1 mg/L CuSO 4 ·5H 2 O, 100 mg/L MnCl 2 ·6H 2 O, 1 mg/L (NH 4 ) 6 Mo 24 ·4H 2 O, 585 mg/L Al 2 (SO 4 ) 3 ·18H 2 O, and 1 g/L Na 2 SiO 3 ·9H 2 O.…”

Parametric study of the factors influencing simultaneous denitrification and enhanced biological phosphorus removal

“…Sludges from the UASB‐A/O process treating high‐strength bean and tomato wastes from the food‐processing industry, CFBBR treating real municipal waste27 and acclimatized bean waste sludge were tested in various batch experiment to investigate the EBPR rates. The characteristics of these sludges with respect to biomass concentration, phosphorus content in the biomass (% P by weight of volatile suspended solids, VSS) and sludge volume index (SVI) are described in Table 2.…”

Effect of extracellular enzyme activity on digestion performance of mesophilic UASB reactor treating high-strength municipal wastewater

“…In the process, the degradation of proteins in the wastewater by anaerobic treatment results in generation of alkalinity due to the reaction of ammonia with carbon dioxide and water [48,49]. However, at low initial alkalinity in the reactor, the decrease in pH will be larger at the increased VFA concentrations [47].…”