Anaerobic Digestion of Food and Market Waste; Waste characterisation and Biomethane Potential: A Case study in Sri Lanka (original) (raw)
Related papers
Assessment of Biological Degradability of the Waste Produced by Food Industry
Ecological Chemistry and Engineering S, 2021
Organic waste from production processes is unutilised potential for the production of energy from renewable sources. The submitted paper studies the conditions of anaerobic degradation of selected waste from food industry (diary and distillery) when biogas is produced. Both types of organic waste have low pH values. Ash form municipal incineration as a material for the treatment of pH of waste was used. Except for the pH increase during anaerobic degradation, ash also serves as a source of macroelements for inoculum microorganisms. Kinetics of anaerobic biological digestion of organic material based on the change of pressure and biogas production depending on the ash addition (change of pH) of input samples was observed. Beside these tests, degradability of the waste was assessed by limiting biologically degradable ratio, BR and specific speed of degradability, q. pH values were adjusted with different amounts of ash (0.5; 1.8; 2.7 g/g of dry matter of organic material). Results of ...
2010
Anaerobic digestion is the process that generates the biogas. This process can be used successfully to treat municipal organic solid wastes and kitchen waste to produce valuable end products, such as methane gas and fertilizer.This research aimed at finding out how a large scale market place in Ratmalana, a city close to capital, Sri Lanka can successfully utilize its organic waste as opposed to land filling or dumping. The study specifically aimed at determination of composition and characterization of waste produced over a season followed by possibility of biogas generation using anaerobic digestion process for the use in a nearby University restaurant. The study revealed that the composition of the market waste as follows; vegetable wastes 45%, fruit wastes 35% , packing materials 15% and restaurant waste/food waste 3%, The materials in the form of stones, plastics, wood etc. was less than 1.3 % of the waste quantity. Total average waste production per day was around 1 ton. The a...
Characterization of Fruit and Vegetable Wastes for Biogas Production under Anaerobic Condition
Fruit and vegetable wastes (FVW) were evaluated for feed stack materials to biogas production under anaerobic digestion. The biogas production and methane content of fruit and vegetable wastes (FVW) degradation were evaluated against a treatment combination with a cow dung at a Ratio of FVW to Cow dung T 1 (cow dung alone), T 2 (1:3), T 3 (1:1), T 4 (3:1), and T 5 (FVW alone). The combinations were allowed to be digested anaerobically at ambient temperature in 2.5 liter sand jacketed triplicate batch digesters and the analysis was done by indirect (water displacement method) and absorption of CO 2 was done by a 10% NaOH methods. The digesters were operated for 80 days. The highest total methane yields about 78.35% was obtained from the cow dung digester (T 1). The highest production of biogas yield (7552.67 ml) was observed in T 1 and the lowest biogas production rate (2652.83ml) was from a reactor operated by FVW alone. Similar to the biogas yield, higher percentage of methane was produced in T 1. The production of biogas and methane content was attributed to the caw dung content the digesters and the result of physico-chemical characteristics of the FVW further revealed suitability of the substrate for biogas production without materials for co-digestion.
Characterisation of Fruit and Vegetable Waste with Cow Dung for Maximizing the Biogas Yield
— The biogas production and methane (CH 4) enrichment for anaerobic digestion (AD) of fruit and vegetable waste (FVW). The biogas production and methane content of fruit and vegetable wastes (FVW) degradation were evaluated against a treatment combination with a cow dung at a Ratio of FVW to Cow dung T1 (cow dung alone), T2 (1:3), T3 (1:1), T4 (3:1),and T5 (FVW alone). The digesters were operated for 80 days. The highest total methane yields about 78.35% was obtained from the cow dung digester (T1). The highest production of biogas yield (7552.67 ml) was observed in T1 and the lowest biogas production rate (2652.83ml) was from a reactor operated by FVW alone. Similar to the biogas yield, higher percentage of methane was produced in 1.Anaerobic digestion; vegetable and fruit wastes of high calorific contents can be transformed to a source of energy through the production of biogas in this day and age of energy insufficiencies. Role in maximizing the process of anaerobic digestion through speeding up hydrolysis and to compare production potentials of commonly available wastes in Addis Ababa for possible co-digestion in large scale production of biogas. Thermo-chemical pre-treatment was the most effective for speeding up hydrolysis with the co-digested substrates producing maximum biogas. The moisture content ranged between 67-83%. The pH reduced from 6.8-7.2 before digestion to 6.2-6.8 after digestion. The desired C: N ratio was between 18:1 to 32:1 for Anaerobic Digestion. The gas produced was found to contain 63.89% methane, 33.12% CO 2 and 3% other gases.
2018
In this study a methodology was developed and applied to evaluate the potential of several organic wastes (cattle manures and catch crops) for anaerobic digestion. These procedure was based on water extraction of the raw sample, which enabled the measurement of the contributions of water-soluble and particulate phases to the studied properties. Biomethane potential (BMP) and chemical oxygen demand (COD) were determined and used to assess the anaerobic biodegradability of raw materials. Analysis of structural carbohydrates, total Kjeldahl nitrogen, water-soluble carbohydrates, volatile fatty acids and pH were also included to explain the main phenomena involved in methane production from the tested biomasses. Results show that the biomass source and its preparation mode had a significant impact on BMP. Likewise, biodegradability rate of feedstocks varied from 45% to 75%. Biodegradability of fresh materials was negatively correlated with the sum of structural carbohydrates and lignin ...
Co-digestion is one of the advantages of anaerobic digestion process because; several wastes having complimentary characteristics can be treated in a single process. The anaerobic co-digestion process, which can be defined as the simultaneous treatment of two –or more – organic biodegradable waste streams by anaerobic digestion offers great potential for the proper disposal of the organic fraction of solid waste coming from source or separate collection systems. A study on anaerobic biodegradability of each of the substrate was carried out before subject to co-digestion in the anaerobic reactor. This paper discusses a case study carried at sewage treatment plant and central vegetable market at Muscat Oman. The most fraction of fruit in the market waste (Orange and Grape) and vegetable (Potato, Carrot and Spinach) were considered as other substrates. The vegetable component was much faster in degradation compared to the fruit fraction. Both fruit and vegetable substrate fed at 5g MVS...