Biogas Production From Various Fruit Peels Environmental Sciences Essay

Analysis of the assorted procedure conditions for the production of biogas ( bio-methanation ) from Mangifera indica Peel, papaia Peel and banana Peel were done. Based on the analysis the procedure conditions were varied consequently and the comparative survey of biogas production from mangopeel, papaia Peel and banana Peel in footings of pH, inoculant to substrate ratio and temperature was carried out.

The major job in the bio-methanation procedure was obstruction and scum formation. Temperature and pH fluctuations besides affect the production of biogas. High temperature ( 55I¦ C ) causes accretion of fatty acids which affects the procedure stableness and influences the pH ( Nagamany and K Ramasamy, Biogas production engineering: An Indian position ) . If cow droppings is used as the inoculant the stableness of the digester is monitored. The pH at 5 the population of bugs is lowered and the activity is reduced ( Sahota and Ajit Singh ) .The ratios of cow droppings to Peels ( 1:2, 1:5, 1:10 ) were used in different apparatuss and the production of biogas was observed. Robert peels of assorted fruits were used in the same ratio and their production rate was measured.The C/N ratio varies for different Peels and was adjusted by add-on of N beginnings for optimisation of production.

The measuring of volume of biogas produced was done utilizing the downward supplanting technique of H2O. Different parametric quantities that were considered to impact the rate of production were observed for different apparatuss. The comparing of production from different Peels purposes at placing the ideal natural stuff beginning and the optimisation of the procedure parametric quantities for the maximal production of the gas.

Keywords: Bio-methanation, procedure parametric quantities, procedure stableness, downward supplanting of H2O


The realisation that the bing fuel resources are acquiring exhausted faster than expected and with the current developmental activities being at its high, the state of affairs demands more conservative action. The demand for the conventional fuel is on an all-time high and the demand can be controlled utilizing alternate fuel beginnings. The extended usage of conventional beginnings over all these old ages has led to debasement in the environment. Since the planetary climatic stableness is at interest the use of renewable and cleaner fuel beginnings is being recommended. The use of renewable fuel beginnings helps to conserve the bing conventional fuel and protect the environment.

Renewable beginnings can be direct ( such as solar energy ) and indirect ( such as biomass ) : energy of the wood and the other biomass obtained from workss has solar energy fixed by the procedure of photosynthesis ( Chang, 2003 ) . Anaerobic digestion is a procedure of biodegradation which uses bacteriums to change over biomass into energy. Energy is in the signifier of biogas which is a mixture of methane and C dioxide which is used for coevals of power.

Fruit Peels are biodegradable in nature and are a possible beginning for the production of biogas. The fruit peels chiefly consist of cellulose, cut downing sugar, non-reducing sugar, wet etc these Acts of the Apostless as a beginning of C and energy for the micro-organism ‘s taking portion in the bioconversion and by enzymatic hydrolysis converts the polymeric constituents of the Peels into monomers. The monomers are converted to soluble organic acids chiefly acetic acid, ( methanogenic bacteriums ) converts it to methane and carbon-dioxide and assorted by merchandises.

Maishanu and Seekimpi ( 1988 ) and Anonymous ( 1992 ) observed that microbes necessitate impersonal or mild alkalic status for optimum biogas production. Assorted parametric quantities such as pH, ratio of substrate: inoculant, temperature affects the production.

Materials and Methods

The Peels of Mangifera indica, papaia and banana were collected from VIT, were cut into smaller fragments and dried. The wet content of the assorted Peels was determined by standard method. The Peels were grinded, the mush was prepared and the slurry was prepared in the ratio in conformity to the several wet content of the Peels. Sieve was done to obtain coveted atom size and stored at room temperature.

2litre anaerobiotic bio-reactor was used to execute the experiment.

BMP Test

Lab Digester: Experiment was performed in 2 litre anaerobiotic bioreactor capped with gum elastic stoppers. Nine reactors were set up and each one was seeded with 20ml of inoculant. For each reactor different cow-dung to skin ratio of ( 1:2, 1:5, 1:10 ) were added. The pH was maintained by utilizing base. Based on the C/N weight ratio of the Peel carbamide was added to optimise the microbic activity. Foods ( FeCl3 – 1g ) were added for optimal growing of bugs. Water was added to the reactors after add-on of substrates.

Reactors were kept at 33-37I¦C under incubation and the production of gas in each reactor was measured by H2O supplanting method.


The wet content of the Peels, solid content, volatile content and pH were determined by Standard method.

Entire volume of gas production from assorted Peels was measured at fixed clip in each twenty-four hours by H2O supplanting method.

Result and Discussion

Improper readying of solids leads to blockage and scum formation: proper milling and dilution ratio of solid is necessary to forestall scum formation and stratification.

The C/N ratio ( i.e. C and N beginnings for microorganisms ) should be 25-30:1and the burden rate is varied based on it.

The gas production depends on the pH, as a pH of 5 reduced the bacterial population and the activity. Optimum pH for methanogenic bugs was somewhat acidic ( 7-7.2 scope ) . pH can be maintained by taking the carbon-dioxide produced during methanation.

Higher temperature increased production but the procedure becomesunstable due to accretion of fatty acids. Concentration of the volatile fatty acid in footings of acetic acid should non transcend 2000-3000 mg/l.

Stability of the digester depends on carbon-dioxide decrease ( either by bugs or unnaturally ) and the accretion of H takes topographic point due to the higher production rate of H than carbon-dioxide decrease rate, it inhibits methanogenesis.

Retention clip of slurry depends on the dilution ratio, lading rate and digestion temperature.

Carbon-dioxide reduces the calorific value of biogas produced therefore the gas is passed through lime H2O to take carbon-dioxide.

Table 1. Assorted parametric quantities and biogas production rate


Fruit Peel used for production

Ratio of inoculant to substrate

Loading rate of the substrate

Volume of flammable gas ( STP ) in liter.

Flammable gas production rate ( litre/day ) .

















The analysis of the production rate of biogas from three different fruit Peels ( Mangifera indica, papaia, and banana ) was done. The procedure conditions that affect the production of biogas in bioreactor were analysed.

The consequence of parametric quantities such as pH, temperature, inoculant to substrate ratio, slurry ratio was studied and the jobs that occur due to the fluctuation of these parametric quantities during the procedure of bio-methanation were identified.

The solutions for these jobs were identified and the execution of optimized procedure conditionsand the production rate of biogas from assorted fruit Peels are to be measured and compared.