Organic Waste Recycling

12 Organic Waste Recycling: Technology and Management

Figure 1.5 Kamol Kij Co. Rice Mill complex, Thailand

The chicken pens are located above the pigsties so that the waste food and
chicken droppings are consumed by the pigs. The manure from pigs, chickens and
ducks is fed to fish ponds. Part of the pig manure is used as influent to the biogas
digester to produce biogas for use in the farm. The fish ponds are cultured with
Pangasius, Tilapia and Clarias and good fish yields are reported. The crops
cultivated on the farm are sugar cane, potatoes, beans, bananas, mangoes and some
vegetables. These crops are fertilized with the fish pond water and the biogas
digester slurry.

1.3.2 Maya Farms, the Philippines

The 24-ha Maya Farms complex maintains 15,000 pigs and markets nearly twice
that number annually (NAS 1981). The biogas plants have been established
primarily to control the pollution from its integrated piggery farms, meat
processing and canning operations. There are various kinds of biogas digesters, but
the large-scale, plug-flow digesters are part of the waste recycling system. About
7.5 tons of pig manure is fed daily into the three biogas digesters; the size of each
digester is 500 m^3 and each produces approximately 400 m^3 of biogas per day. The
biogas replaces liquefied petroleum gas (LPG) for cooking and other heating

Rice mill

Parboiled

paddy

Rice Market

Oil extraction plant

Kiln

Rice bran

Rice husks

De-fatted bran

Bricks

White ash (Silica)

Bran oil

Ash

Agricultural (Kirikan) farm

Paddy