Biogas plants
at pig farms

Biogas plants at pig farms

Pig manure and pig slurry are waste products and substrates for biogas production at the same time.


The less water the better

There are 3 systems for pig manure removal and pig keeping: self-flow, hydro-flush and cold-keeping.

Other names for self-flow pig manure removal system are slot floor/bath with cork system, Danish or Spanish system.

  1. Self-flow (cork / slot floor)

    Adding water to pig manure 1:1-2. Pig manure is accumulated in a bath with a cork which is removed once every 1-3 weeks. Self-flow is ideal for biogas production. New pig farms mainly use the self-flow system.

  2. Hydro-flush

    Adding water to manure 1:10. Pig manure is washed off constantly. The system is mainly used on old 100,000-head pig farms. Biogas reactors using wastewater are very large. The organic load in the reactor is very low. The biogas plants can be built only for a part of manure, the separated fraction. Hydro-flush is often confused with a self-flow.

  3. Cold-keeping

    Pigs are kept in tent hangars constantly on deep bedding. Pig manure is removed only once after slaughter. With this method, a biogas plant does not make sense due to the fact that most gas having left the manure over 5 months. And high bedding content creates difficulties when mixing substrates in reactors.

Systems for pig keeping

Zorg Biogas has built several biogas plants for pig farms. Examples are a biogas plant, 125 kW, for a pig reproduction farm with 1,500 sows Demis-Agro Ltd (Podgorodnoe, Ukraine). In Podgorodnoye, oil from chips and confectionery waste are added to the pig manure.

A biogas plant, 635 kW, for a full-cycle pig farm Porco-Bela Ltd (Cimiseni, Moldova). Her slaughter house waste are added.

Proposal biogas plant 325 kW for a farm 30 000 pigs per year

To calculate a quotation for a biogas plant, please fill out the questionnaire for pig farms.

Zorg Biogas’s plants for this industry







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