CENTRAL PROCESSING OF PIG MANURE IN THE NETHERLANDS

One of the possibilities to abate the environmental problems caused by pig manure surpluses is separation of the manure into clean water and an organo-mineral fertilizer. An efficient way to realise such a sepa ration is by central processing in large plants. The process in such a plant comprises a large number of logically arranged basic treatment steps. In the Netherlands, practical application of large-scale centra l processing of pig manure has just been started. Two of these systems are discussed, the Promest system and the Memon system. Based on seve ral studies the investment of a central treatment plant, with a proces sing capacity of 500,000 tonnes of raw pig manure annually, is estimat ed at approximately Dfl. 100,000,000. Gross operating costs are estima ted at about Dfl. 60 per tonne of raw pig manure. The value of the fer tilizer produced per tonne of raw pig manure is estimated at an amount between Dfl. 20 and Dfl. 35. Foreign markets have to be opened for ut ilisation of this fertilizer in agriculture. To improve such central p rocessing systems, current research focuses on the improvement of exis ting systems, development of new systems, and production of more valua ble products such as lysine.