Improved biofertilizer properties of digestate from codigestion of brewer’s spent grain and palm oil mill effluent by manure supplementation

Abstract

The biofertilizer quality of anaerobically codigested agroindustrial residues from brewer's spent grain and palm oil mill effluent was evaluated after supplementation with different livestock manure in order to validate its use as organic fertilizer. Manure supplementation assay was performed using different animal manure-inoculum to demonstrate the influence of inoculum-type on the nutrient status, plant growth promoting bacteria (PGPB) and other plant growth promoting attributes of the resultant digestate. In addition to elevated nutrient levels (K > P > Ca > Mg > S > N), the plethora of essential microbial groups (phosphate solubilizers > diazotrophs > auxin producers) that enhance nutrition and promote plant growth was evinced in the supplemented digestate compared to the control. On the other hand, environmental risk assessment revealed a notable yet inadequate reduction in indicator bacteria and putative pathogens (> 3.0 log CFU mL − 1) with potentially toxic elements within publicly available requirements. The preponderance of PGPB with excellent biofertilizing attributes observed in this study could be leveraged upon by plants thus substantiating its potential for use as organic fertilizer. However, the presence of pathogens highlights the importance of post-treatment hygienization to eliminate its biosafety risk.

Pretreatment, Anaerobic Codigestion, or Both? Which Is More Suitable for the Enhancement of Methane Production from Agricultural Waste?

“…On the other hand, in a recent study focused on the AcoD of SS with FVW consisting of cabbage, eggplant, zucchini, potato, broccoli, tomato and nectarine, the highest CMP (127 mL/gVS) was achieved when the ratio of sludge in the mixture was high (25:75 (FVW/SS)) [ 34 ]. Although this study focused on methane production and the hydrolysis rate of agricultural wastes and sewage sludge by anaerobic codigestion, it should be noted that different kinds of waste materials such as brewery spent grain, palm oil mill, spent coconut cobra, manure and cow urine as a cosubstrate [ 35 , 36 ] have been codigested from the point of methane yields and improved biofertilizer properties of digestate.…”

Comparative environmental impact evaluation using life cycle assessment approach: a case study of integrated membrane-filtration system for the treatment of aerobically-digested palm oil mill effluent

“…The release of untreated POME into water bodies causes environmental pollution by reducing the dissolved oxygen concentration therein, hence threatening the life of aquatic organisms [2,3]. Over the past few decades, POME has conventionally been treated with the use of a series of open ponds [4]. Nevertheless, this conventional biological treatment suffers from the emission of greenhouse gases (GHS), i.e., methane and carbon dioxide (CO 2 ) [5].…”

Hydrothermal sulfonation of palm empty fruit bunch carbon as solid acid catalyst and its hydrolysis catalytic activity

“…PEFB consist potential component of 44.4% of cellulose; 30.9% of hemicelluloses, and 14.2% of lignin that could be utilized for more useful products (5,6). Due to the high content of biomass, many researchers have investigated the utilization of PEFB such as biodiesel (7), biogas (8), ethanol and nanocomposites (9) and other value-added products (6,10,11). However, there is increasing concern to utilize PEFBs with low cost of process.…”