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      Effect of mixture ratio on co-digestion of vegetable and fruit waste with macro-algae, chicken manure and tofu dregs

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      IOP Conference Series: Earth and Environmental Science
      IOP Publishing

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          Abstract

          Fruit and vegetable wastes (FVW) are generated in many traditional markets in Indonesia and mostly disposed directly to landfill. Various studies highlighted that FVW could be further valorised either as bioenergy resources or other high-value products. In this study, the biochemical methane potential (BMP) and its electrical energy potential from co-digestion of FVW with macro-algae (MA), chicken manure (CM) and tofu dregs (TD) were investigated. The research design used was a Completely Randomised Design (CRD). All treatments were prepared in triplicate at a ratio of 100:0; 70:30 and 50:50, respectively. All individual anaerobic co-digestion tests of FVW with CM and TD were carried out at the organic loading rate (OLR) of 3 kg VS/m 3/day. The effects of different feedstock ratio on stability and performance indicators were further evaluated. The biomass characterisation analyses showed that FVW, MA, CM and TD samples have a high amount of carbohydrates, proteins, and fats, indicating their suitability as feedstock for biogas production. All tested samples have pH value within the ideal range of 6.8-8.0, indicating that there was no pH inhibition during the digestion process. Increasing co-digestion feed ratio of FVW: CM (70:30) or FVW: TD (70:30) was found to reduce biogas or methane potential. The theoretical estimation of electrical potential from co-digestion of FVW indicated that changing the feed to a ratio of 50:50, produced higher energy generation. This finding confirmed that co-digestion could be an option to enhance biogas and methane yield due to additional nutrient supply from the co-substrates.

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          Most cited references32

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          Reviewing the anaerobic digestion of food waste for biogas production

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            Agricultural benefits and environmental risks of soil fertilization with anaerobic digestates: a review

            Roger Nkoa (2014)
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              Optimizing feeding composition and carbon-nitrogen ratios for improved methane yield during anaerobic co-digestion of dairy, chicken manure and wheat straw.

              This study investigated the possibilities of improving methane yield from anaerobic digestion of multi-component substrates, using a mixture of dairy manure (DM), chicken manure (CM) and wheat straw (WS), based on optimized feeding composition and the C/N ratio. Co-digestion of DM, CM and WS performed better in methane potential than individual digestion. A larger synergetic effect in co-digestion of DM, CM and WS was found than in mixtures of single manures with WS. As the C/N ratio increased, methane potential initially increased and then declined. C/N ratios of 25:1 and 30:1 had better digestion performance with stable pH and low concentrations of total ammonium nitrogen and free NH(3). Maximum methane potential was achieved with DM/CM of 40.3:59.7 and a C/N ratio of 27.2:1 after optimization using response surface methodology. The results suggested that better performance of anaerobic co-digestion can be fulfilled by optimizing feeding composition and the C/N ratio. Copyright © 2012 Elsevier Ltd. All rights reserved.
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                Author and article information

                Journal
                IOP Conference Series: Earth and Environmental Science
                IOP Conf. Ser.: Earth Environ. Sci.
                IOP Publishing
                1755-1307
                1755-1315
                April 01 2021
                April 01 2021
                : 733
                : 1
                : 012140
                Article
                10.1088/1755-1315/733/1/012140
                1119d6ed-f57d-4c80-b0d7-f2ce5207e06e
                © 2021

                http://creativecommons.org/licenses/by/3.0/

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