| 摘要 |
PURPOSE: A disposal method of pig ordure is provided to greatly reduce gravimetric loads of pollutants, volume of various baths, loads of subsequent processes, facility cost, and maintenance costs as well as demonstrate a maximal efficiency of ordure treatment. CONSTITUTION: Pig ordure is primarily separated into solid and liquid by use of an inorganic coagulant. In this solid-liquid separation, the inorganic coagulant causes oxidation of pig ordure and generates gas while coagulating solids of the pig ordure. Meanwhile, the pig ordure is aerated by stirring to cause bubbles. Along with the gas, the bubbles float the coagulated solid of the pig ordure. These solids are removed. Then, the liquid is neutralized in pH and secondarily subjected to solid-liquid separation by use of an organic polymer coagulant. Thirdly, the secondarily treated effluent is treated through biological treatment processes. In reference to tanks, a primary treatment step of reacting pig ordure with an inorganic coagulant is conducted in a reactor. A secondary treatment step is carried out in a neutralization tank, a coagulation tank and a flotation or a sedimentation tank, in order. For the third treatment step, a biological treatment tank and a sedimention tank are used. Finally, the sludge is allowed to stand in a sludge reservoir, concentrated in a thickener and dehydrated in a dehydrator.
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