Biogas and animal husbandry in China
As the biggest developing country and a big agricultural country in the world, China has one of the biggest potential markets of bioenergy. Especially these years, bioenergy plays an increasing role in the national energy strategy. In China, because of the huge population and the low arable land per capita, arable land is very valuable, and the food is the cardinal question. That is why the basic principle to develop biomass is "No fight with people for food and No fight with food for land". China advocates use waste, such as agricultural and forestry waste and industrial wastewater to produce bioenergy. It is not allowed to plant energy crops in large scale, therefore the use of agricultural residues plays a quite important role in the development of renewable energy. On December 21, 2016, Chinese President Xi Jinping chaired the 14th Meeting of the Central Leading Group on Finance and Economics. He proposed that biogas and biomethane should be the main treatment directions of livestock and poultry dung, and in rural areas, making use of rural energy and organic fertilizer. During the 13th Five-Year Plan period, China strives to basically solve the problem of waste disposal and resource utilization in large-scale livestock and poultry farms.
China has the biggest agricultural residues output quantity in the world, around four billion tons annually. Among that, there are 700 million tons of straw from crops. And with the development of modern agriculture, the total amount will increase by 5% to 10% per year. It is estimated that in 2020, the quantity of straw will reach 95 million tons/year.
Agricultural wastes in China mainly include crop stalks and livestock manure.
- Crop straw: In 2015, the theoretical resources amounted to 1.04 billion tons and the utilization amount was 0.72 billion tons, and the comprehensive utilization ratio was 80%. 80.1% of crop residue utilized in China.
- Livestock and poultry dung: currently there are about 3.8 billion tons, and more than 40% are not effectively utilized yet. Pig, cattle and chicken manure are the three main kinds of livestock and poultry. The annual output poultry of large-scale livestock farming is 19 million tons.