Respirometric studies on the effectiveness of biogas production from wastewaters originating from dairy, sugar and tanning industry

Abstract

The objective of the present study was to determine the effectiveness of biogas production during methane fermentation of wastewaters originating from the dairy, tanning and sugar industries, by means ofrespirometric measurements conducted at a temperature of 35 degrees C. Experiments were carried out with the use of model tanks of volume 0.5 dm3. A high production yield of biogas, with methane content exceeding 60%, was achieved in the case of the anaerobic treatment of wastewaters from the dairy and sugar industries. A significantly lower effect was observed in the case of tanning wastewaters. The effectiveness of the fermentation process decreased with increasing loading of the tanks with a feedstock of organic compounds. By loading a model tank with this feedstock, the effectiveness of treatment ranged from 62.8% to 71.4% residual chemical oxygen demand for dairy wastewaters and from 57.9% to 64.1% for sugar industry wastewaters. The efficiency of organic compound removal from tanning wastewaters was below 50%, regardless of the method applied.

Methanogenic archaeon as biogas producer in psychrophilic conditions

“…Similar results were obtained Table 4 The quantity (mean AE SD) of biogas and methane attributable to 1 g of fed COD (COD fed ) load and the initial concentration of Methanococcoides burtonii biomass (MB). by Dę bowski et al (2013) in a study on the effectiveness of biogas production during methane fermentation of wastewaters from dairy, sugar and tanning industries. But still, that study was conducted under mesophilic conditions and this could, probably, be the reason for the higher methane content in biogas (over 60%), compared to our experiments.…”

Technical evaluation of photobioreactors for microalgae cultivation

“…A bioreactor could also be equipped with a gas exchange system [34]. This type of photobioreactor is considered as one of the most effective designs, dedicated to the cultivation of small volume of microalgal suspension, i.e.…”

“…Abiotic factors include the light, as the growth of biomass requires both light exposition over a given time, its adequate intensity, temperature, concentration of nutrients, O 2 and CO 2 content, pH value, salinity and presence of toxic chemicals [28]. Biotic factors include the presence of pathogens (bacteria, fungi, viruses) and the mutual effect of other algae strains [34]. An important group of parameters affecting the growth of algae is imposed by such process parameters as: intensity of mixing, biomass concentration and the related frequency of algae harvesting.…”

Anaerobic degradation of dairy wastewater in intermittent UASB reactors: influence of effluent recirculation

“…[5] Anaerobic biodegradability tests indicated that 91% of the organic matter present in the effluent from milk pasteurization and cheese manufacturing without whey segregation was degraded in anaerobiosis. [6] et al [7] studied the anaerobic degradation of dairy wastewaters in batch reactors with chemical oxygen demand (COD) loads ranging from 1.0 to 3.0 kg COD m −3 . Depending on the load applied, the effectiveness of the treatment process ranged from 62.8% to 71.4%.…”

“…Literature presents several results for the degradation of dairy wastewater in batch reactors. [5][6][7][8] Yet, if effluent recirculation is applied during the feedless periods, the hydrodynamic conditions may significantly alter the COD removal mechanisms and subsequent biological degradation observed in feedless periods of intermittent systems. The importance of the hydrodynamic conditions is related to mass transfer mechanisms [36] and to adsorption phenomena responsible for the major percentage of initial COD removal from complex wastewaters in anaerobic systems.…”