The Addition of Hatchery Liquid Waste to Dairy Manure Improves Anaerobic Digestion

Abstract

The objective of this study was to determine the optimal inclusion level of liquid egg hatchery waste for the anaerobic co-digestion of dairy cattle manure. A completely randomized experimental was applied, with seven treatments (liquid hatchery waste to cattle manure ratios of0: 100, 5:95, 10:90, 15:85, 20:80, 25:75 and 30:70), with five replicates (batch digester model) each. The evaluated variables were disappearance of total solids (TS), volatile solids (VS), and neutral detergent fiber (NDF), and specific production of biogas and of methane. Maximum TS and VS disappearance of 41.3% and 49.6%, were obtained at 15.5% and 16.0% liquid hatchery waste inclusion levels. The addition of 22.3% liquid hatchery considerably reduced NDF substrate content (53.2%). Maximum specific biogas production was obtained with 17% liquid hatchery waste, with the addition of 181.7 and 229.5 L kg -1 TS and VS, respectively. The highest methane production, at 120.1 and 151.8 L CH 4 kg -1 TS and VS, was obtained with the inclusion of 17.5 and 18.0% liquid hatchery waste, respectively. The addition of liquid hatchery waste atratios of up to 15.5%in co-digestion with cattle manure reduced solid and fiber levels in the effluent, and improved biogas and methane production.

Simulating Rumen Conditions Using an Anaerobic Dynamic Membrane Bioreactor to Enhance Hydrolysis of Lignocellulosic Biomass

“…Lignocellulosic materials are comprised of cross-linked structures of cellulose, hemicellulose, and lignin that are difficult to break down by anaerobic microorganisms and are present in high amounts in various wastes (agricultural wastes, yard and park waste, vegetable and fruit fraction of food waste, paper waste, etc. ). − Combining substrate pretreatment (chemical, mechanical, or enzymatic) with a long solids retention time (SRT) of >40 days can hydrolyze up to 90% of lignocellulose. − Novel bioreactor designs, such as anaerobic dynamic membrane bioreactors (AnDMBR), can reduce footprint requirements by decoupling the SRT and hydraulic retention time (HRT). Nevertheless, operating costs remain high due to energy and chemical requirements. − …”

Simulating Rumen Conditions using an Anaerobic Dynamic Membrane Bioreactor to Enhance Hydrolysis of Lignocellulosic Biomass

“…Novel bioreactor designs, such as anaerobic dynamic membrane bioreactors (AnDMBR), can reduce footprint requirements by decoupling the SRT and the hydraulic retention time (HRT). Nevertheless, operating costs remain high due to energy and chemical requirements [11][12][13][14][15][16] .…”