Effect of natural and modified zeolite addition on anaerobic digestion of piggery waste

Abstract

The effect of natural and modified zeolites on the anaerobic degradation of acetate and methanol was evaluated by the determination of specific methane productivity (SMP) in batch minidigesters of 50 mL at doses of 0.01, 0.05 and 0.1 g of zeolite/g of VSS. The effects of the different zeolite concentrations were determined by the results of the SMP. A kinetic characterization with data of accumulated methane gas volume was also carried out. In the second phase of the study, the effects of natural and nickel zeolite concentrations were tested with piggery waste in laboratory scale digesters of 2.5 L operating at semi continuous mode, by increasing the organic load applied from 0.2 to 22.0 g TCOD/d corresponding to organic loading rates (OLR) of 0.1-8.8 g TCOD/l x d. A greater effect of modified zeolite on SMP was observed, with an increase of 8.5 times with magnesium zeolite, 4.4 times with cobalt zeolite and 2.8 times with nickel zeolite. Two phases were defined in the kinetic study and an increase of more than 2 times the apparent constant of digesters with modified zeolites was observed in the second phase when compared to unmodified natural zeolite. Modified natural zeolite addition to digesters can allow an increase in the potential biodegradability of piggery waste solid fraction and/or a considerable reduction of digestion volume.

Removal of Sulphate and Manganese on Synthetic Wastewater in Sulphate Reducing Bioreactor Using Indonesian Natural Zeolite

“…Since zeolite R1 had the smallest diameter compared with zeolite R2 and R3, therefore increasing the surface area of zeolite for attachment and colonization of SRB. These enhancements influenced microbial and enzymatic transformation of a variety of substances for sulphate reducing bacterial during their attachment and colonization in the zeolite surface [26][27][28]. In addition zeolites have been reported to absorb manganese and other heavy metals [29][30].…”

Effect of particle size and doses of zeolite addition on anaerobic digestion processes of synthetic and piggery wastes

“…However, conventional digesters used in rural areas must be operated at retention times higher than 20 days in order to achieve adequate organic matter removal efficiencies and prevent the washout of microorganisms. The increase of wastewater anaerobic process efficiency by using natural and modified zeolites has been pointed out by several authors [5,6]. The adequate doses of natural zeolite have also been studied [7].…”

Influence of Nutrient Impregnated into Zeolite Addition on Anaerobic Digestion of Palm Oil Mill Effluent (POME)

“…The presence of nickel in anaerobic digestion processes could increase acetate utilization rate of methanogenic bacteria. Similarly, Milán et al [9] observed the modified zeolite with nickel increase the methanogenic specific activity by 2.8 times in anaerobic digestion of piggery waste. Nickel was a unique micronutrient for methanogenic bacteria.…”