The medium-scale Ear Long pig farm in Thailand integrates pig meat production with crop production and aquaculture. It shows well thought through manure management.
The 700 pigs are kept on a concrete floor with water flush area. The solid excretions are shoveled out daily. They are either sold or used as organic fertiliser for crops and the ponds with larger fish.
The flush water drains into a lagoon with zooplankton. This uses the remaining nutrients in the flush water, thereby improving water quality and again providing feed for aquaculture. From here the water is oxygenated as it overflows to the second, third and fourth lagoon. Finally the water flows through a shallow pond with buffer plants before being released outside the farm.
Separating the solid manure and the much diluted flushing water pays off. Methane emissions are reduced compared to the normal use of mixing dung, urine and flushing water. The solid manure is utilized more efficiently compared to liquid manures, while the remaining nutrients in the flush water are recycled as fish feed.