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pig waste 2008-7-12


Pig waste disposal and the resources comprehensive utilization

Doctor candidate

Liu Chang

Content
● Current situation of pig waste pollution ● Disposal difficulty of pig waste ● Method ● Idea

Current situation of pig waste pollution
● Pig amount of whole country — 660 million

Pig waste pollution of whole country is equivalent to sewage discharge quantity of 5.9 billion persons.

● Pig amount of Hubei province — 27 million

About 500 pig farms which have more than 10,000 pigs, and 897 pig farms which has 3000 to 10,000 pigs were constructed in Hubei province.

Disposal difficulty of pig waste
Characteristic of pig waste
● Nitrogen content and phosphorus content is very high, about several times of city sewage.

Disposal difficulty
● The investment of existing disposal unit is too high to be adopted by pig farms. ● Because of the high concentration of pig waste, the running cost of disposal unit is very high. ● The utilization of pig waste is not enough, profit from pig waste transforming into resources is too low to repay the disposal cost.

Compare of pig wastewater with city sewage pig wastewater COD (mg/L) NH3 (mg/L) TP (mg/L) 8000~15000 1000~2000 400~600 city sewage 300~600 30~70 10~50



Anaerobic fermentation can convert organic waste into biogas and decrease concentration of the waste. But the process is slow, under 40℃ it need 30 days at least for full biogas transform.

Method
Pig waste Drying & Purification CH4 Liquid-solid separation
Solid Liquid

Fuel

Biogas production

Wastewater processing

Fertilizer production

Residue

Fertilizer production—Compost

Demonstration project in YiCheng city of HuBei province

Methane water heater

Methane lamp

Methane stove

Methane Food hot pot

Biogas supply in YiCheng City

UBF reactor (Upflow anaerobic Bio-Filter)

idea
Cleaning up pig waste with machine Receiving majority of pig waste and decreasing 90% of swill water The machine can load 100 kg pig waste, one 10,000 pigs farm only need six sets of this kind of machine.


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