• Biogas Energy and Sanitation Provision

  • In an effort to conserve the environment and at the same time provide energy for both household and industrial use, Peppy Limited specializes in the costruction of Biogas Plants.
    Biogas is a low cost source of energy derived from renewable resources like agricultural, animal, domestic and industrial waste. It is produced in a non oxygeneted environment commonly referred to as an anaerobic environment, where biomass like vegetable wastes, animal excreta, and weeds undergo decomposition in the absence of oxygen and form a mixture of gases. This mixture is the biogas which is used as fuel for cooking, lighting and for running engines for shaft and electrical power generation with little or no pollution.
    The Biogas production process not only leads to a healthy and clean environment, but also produces renewable energy sources like methane and the by-product is a solid residue which is high-grade manure for agricultural use.
    This processing of biogas happens in a biogas plant. Biogas plants are considered to be cheap sources of energy especially in rural areas where there is no electricity provision.
  • Biogas Plant Construction
    In the Production of Biogas, Plants are anaerobic digesters where all the processing takes place.
    Their construction is often times determined by two major factors.
    1. The amount of waste material available for processing.
    2. The amount of gas required for a specific use.
    There are different types of Plants based upon their design and mode of operation.
    Peppy specializes in the construction of three major biogas plants depending on which one best suits a clients needs.
  • a).Floating gas-holder plant.

    Floating gas-holder plant

    This plants consist of an underground digester and a moving gas-holder. The gas-holder floats either directly on the fermentation slurry or in a water jacket of its own. The gas is collected in the gas drum, which rises or moves down, according to the amount of gas stored and is prevented from tilting by a guiding frame. If the drum floats in a water jacket, it cannot get stuck, even in substrate with high solid content. Floating-drum plants are used chiefly for digesting animal and human feces on a continuous-feed mode of operation, with daily input. They are used most frequently by small- to middle-sized farms (digester size: 5-15m3) or in institutions and larger agro-industrial estates (digester size: 20-100m3).

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    b).Fixed dome plant

    Fixed dome plant

    A fixed-dome plant consists of a digester with a fixed, non-movable gas holder, which sits on top of the digester. When gas production starts, the slurry is displaced into the compensation tank. Gas pressure increases with the volume of gas stored and the height difference between the slurry level in the digester and the slurry level in the compensation tank. The costs of a fixed-dome biogas plant are relatively low. It is simple as no moving parts exist. There are also no rusting steel parts and hence a long life of the plant (20 years or more) can be expected. The plant is constructed underground, protecting it from physical damage and saving space.

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    c).Bag/Balloon plant

    • Bag/Balloon plant

    This plants consist of a heat-sealed plastic or rubber bag (balloon), combining digester and gas-holder. The gas is stored in the upper part of the balloon. The inlet and outlet are attached directly to the skin of the balloon. Gas pressure can be increased by placing weights on the balloon. If the gas pressure exceeds a limit that the balloon can withstand, it may damage the skin. Therefore, safety valves are required. If higher gas pressures are needed, a gas pump is required. Since the material has to be weather- and UV resistant, specially stabilized, reinforced plastic or synthetic caoutchouc is given preference. Other materials which have been used successfully include RMP (red mud plastic), Trevira and butyl.

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