The less water the better
There are 3 systems for pig manure removal and pig keeping: Self-flow (cork / Danish or Spanish system/ slot floor), Hydro-flush and Cold-keeping.
Self-flow (cork / Danish or Spanish system/ slot floor)
Adding water to manure 1:1. Manure is accumulated in a bath with a valve which is opened once every 1-3 weeks. Self-flow is ideal for biogas production. New pig farms mainly use the self-flow system.
Adding water to manure 1:10. Manure is washed off constantly. The system is mainly used on old 100,000-head pig farms. Biogas reactors are very large. The organic load in the reactor is very low. The construction of biogas plants for hydro-flush manure is not recommended if the reason for construction is based on economics. The biogas plants can be built only as environmental projects. Hydro-flush is often confused with a self-flow.
Pigs are kept in tent hangars constantly on deep bedding. Manure is removed only once after slaughter. With this method, a biogas plant does not make sense due to 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 breeding operation with 1,500 sows Demis-Agro Ltd (Podgorodnoe, Ukraine), a biogas plant, 635 kW, for a full-cycle pig farm Porco-Bela Ltd (Cimiseni, Moldova).
In Podgorodnoye, oil from chips and confectionery waste are added to the manure.
To calculate a quotation for a biogas plant, please fill out the questionnaire for pig farms.