Assessement of Bio-fertilizer Quality of Anaerobic Digestion of Watermelon Peels and Cow Dung

2020 ◽  
Author(s):  
Dahiru Usman Hassan ◽  
Surajudeen Abdulsalam
Keyword(s):  
Anaerobic Digestion ◽  
Cow Dung

scholarly journals Biogas production from cow dungs using a modified fixed-dome digester

2021 ◽  
Vol 7 (3) ◽  
pp. 224-230
Author(s):  
Mtamabari Simeon Torbira ◽  
Ebigenibo Genuine Saturday
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Production ◽  
Total Solid ◽  
Cow Dung ◽  
Biogas Yield ◽  
Carbon To Nitrogen Ratio ◽  
Temperature Range ◽  
Nitrogen Ratio ◽  
Design And Construction

A modified fixed dome digester with stirring mechanism has been designed and constructed and used for the anaerobic digestion of cow dung slurry at 5%-7% Total solid (TS) concentration within the mesophylic temperature range. The quality of biogas gas produced was between 54%-69% methane (CH4) content. The Carbon to Nitrogen ratio (C: N) varied between 35:1 - 45:1. Total biogas yield obtained over the detention period was about 261 L. The maximum and minimum temperatures recorded over the 95 days period was 32oC and 25 oC respectively. The volume of biogas yield, Vb (m3) was observed to increase with the percentage total solid, PTS (%). The details of the design and construction of the biogas digester plant and its cost are reported. The performance of the plant was very satisfactory. Investigation into the anaerobic digestion revealed that cow dung has great potentials for generation of biogas.

scholarly journals Enhancing biogas quality of indigofera plant waste through co-digestion with cow dung

2018 ◽  
Vol 154 ◽  
pp. 02001 ◽  
Author(s):  
Finda Sihta ◽  
Suyitno ◽  
Atmanto Heru Wibowo ◽  
Retno Tanding
Keyword(s):  
Power Generation ◽  
Anaerobic Digestion ◽  
Production Process ◽  
Natural Dyes ◽  
Cow Dung ◽  
Key Factors ◽  
Digestion Process ◽  
Plant Waste ◽  
Reactor Temperature

The production process of indigofera plants yields 10% of blue natural dyes and wastes are 90%. The biomass wastes from the extraction of indigofera plants are classified as difficult to process in an Anaerobic Digester (AD) because of the large content of hemicellulose in the Indigofera stems. Therefore, the study reports the anaerobic digestion of Indigofera plant wastes co-digested with cow dung for enhancing the biogas quality. The digestion process was conducted in a vessel of 160 L with various weight ratios between Indigofera biomass and cow dung by 0%, 25%, 50%, 75%, and 100%. The results show that the AD reactor temperature kept above 29.5°C with a pH between 6-7 were the key factors for enhancing the biogas quality. The co-digestion between 50% indigofera wastes with 50% cow dung yielded biogas with a CH4 content of about 42% and H2S concentration below 40 ppm showing that the biogas has the potential to be further improved in quality and can be used to fuel the stove and power generation.

scholarly journals Comparative assessment of bio-fertiliser quality of cow dung and anaerobic digestion effluent

2018 ◽  
Vol 4 (1) ◽  
pp. 1435019 ◽  
Author(s):  
Mashudu Mukhuba ◽  
Ashira Roopnarain ◽  
Rasheed Adeleke ◽  
Mokhele Moeletsi ◽  
Rosina Makofane ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Comparative Assessment ◽  
Cow Dung

scholarly journals Testing the Impact of Waste from Anaerobic Digestion (Enriched with an Organic Component) on the Quality of Agricultural Land

2017 ◽  
Vol 63 (4) ◽  
pp. 33-38
Author(s):  
Jana Kodymová ◽  
Miroslav Kyncl ◽  
Hana Švehláková ◽  
Magdaléna Bártková
Keyword(s):  
Anaerobic Digestion ◽  
Field Trial ◽  
Laboratory Tests ◽  
Agricultural Land ◽  
Mineral Fertilizer ◽  
Organic Component ◽  
Carbon And Nitrogen ◽  
Macro And Micronutrients ◽  
The Impact

Abstract Waste from anaerobic digestion is considered as a mineral fertilizer and it is usually applied to agricultural land. The aim of our attempt was to enrich this waste from anaerobic digestion (digestate) with an organic component (in our case represented by haylage). For this purpose, we made different mixtures of digestate and haylage in different weight ratios. In the field trial, the effect of these mixtures on the soil, under standard agricultural conditions, was monitored. Selected accessible nutrients (P, K, Mg, Mn, Ca) and the amount of carbon and nitrogen in the soil were monitored. The results of the laboratory tests confirmed that the areas where the sowing and digestate mixtures were applied showed greater amounts of macro- and micronutrients in plant-accessible forms than the surface fertilized only with digestate or areas fertilized only with standard fertilizers.

Dry Anaerobic Digestion of Cow Dung for Methane Production: Effect of Mixing

2012 ◽  
Vol 15 (23) ◽  
pp. 1111-1118 ◽  
Author(s):  
Ajay Kumar Jha ◽  
Jianzheng Li ◽  
Qiaoying Ban ◽  
Liguo Zhang ◽  
Bowei Zhao
Keyword(s):  
Anaerobic Digestion ◽  
Methane Production ◽  
Cow Dung ◽  
Production Effect ◽  
Dry Anaerobic Digestion

scholarly journals Heat Exchanger for Bio-Digester under Thermophilic Range

2019 ◽  
Vol 5 ◽  
pp. 79-88
Author(s):  
Prajwal Sapkota ◽  
Laxman Poudel
Keyword(s):  
Heat Exchanger ◽  
Anaerobic Digestion ◽  
Heat Exchangers ◽  
Heating System ◽  
Gas Production ◽  
Cow Dung ◽  
Digestion Rate ◽  
Digestion Process ◽  
Different Temperatures ◽  
Long Time

Bio-gas has been one of the sources of renewable energy and has been used from long time. It is produced by the anaerobic digestion or decomposition of organic compounds and has different process. The digestion process is carried out by bacteria present in the waste and it is highly dependent on the bacteria which work differently on different temperatures. The rate of anaerobic digestion is highest at hemophilic temperature (55°C). Similarly, it is moderate at mesophilic temperature (35°C) and is lowest at psychrophilic (below 20°C). Thus, to attain the highest digestion rate a thermophilic heating system has beend eveloped. The heating system uses five heat exchangers to heat the influent at digester which is of 35m3 volume, to maintain temperature at 56°C. The volume of bio-gas production from this system which uses cow dung as digestingmaterial is about 28 m3 per day.

scholarly journals Cow Urine for Enhancement of Biogas Production and Fertilizer Quality of Biogas Slurry

2020 ◽  
Vol 12 (1) ◽  
pp. 135-144
Author(s):  
M. R. Fardous ◽  
M. S. Nasrin ◽  
M. E. Shakil ◽  
M. S. Islam ◽  
M. A. Hoque ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Biogas Production ◽  
Cow Dung ◽  
Biogas Slurry ◽  
Volatile Solid ◽  
Maximum Conversion ◽  
Cow Urine ◽  
Experimental Trials ◽  
Gas Volume

To explore the potency of cow urine on biogas production and fertilizer quality of the biogas slurries, six experimental trials,  T0 (50% CD:50% Water) as control, T1 (10% CD:90% CU), T2 (20% CD:80% CU), T3 (30% CD:70% CU), T4 (40% CD:60% CU) and T5 (50% CD:50% CU) were constructed  by mixing cow dung (CD) and cow urine (CU). Cumulative gas volume was estimated for 30 days and the physicochemical properties of the slurries were evaluated. The cumulative gas volume of three trials (T3, T4 and T5) was higher than control (T0) and T5 showed maximum (28% over the control). Moreover, all of the trials except one (T1) showed higher gas yield than control (T0) of which maximum conversion of volatile solid (VS) to gas was obtained in T3. pH of the amended samples were above 7.0 (pH 7.00-7.42). Conductivity of the samples also increases (1.94-13.40 mS cm-1) with the increase in cow urine percentage. With respect to macronutrient (N, P, K) cow urine amended samples can be considered superior to the control one. Moreover, C/N ratio of all the amended samples were below 15 (4.7-14.0) and thus these are suitable for agronomic uses.

Utilization of Digestate

2020 ◽  
Author(s):  
Jacob Joseph Lamb
Keyword(s):  
Anaerobic Digestion ◽  
Natural Resources ◽  
Biogas Production ◽  
Production Cycle ◽  
Biological Value ◽  
Mineral Phosphorus ◽  
Macro And Micronutrients

After biogas extraction by anaerobic digestion, digestate (the digested biogas production cycle effluent), consists of feedstock materials that have biological value. Digestate composition and quality strongly depend on the composition and quality of the feedstock used. Thanks to the amount of readily accessible macro- and micronutrients, digestate is a beneficial crop fertilizer that can be used as slurries for raw animals. Recycling as a fertilizer is known to be the most efficient use of digestate, as it can sustain a society in general and the environment in particular, as well as helping to conserve precious natural resources such as mineral phosphorus fossil. This chapter gives an overview of the uses of digestate as a fertilizer.

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