| 摘要 |
<p>PURPOSE:To increase the amt. of the digester gas to be produced without generating malodor with an anaerobic digester treatment of separated liquid by subjecting the org. treating material subjected to a wet oxidation treatment to a flocculation treatment at pH on an adequate acidic side in the presence of ferric salt thereby forming the separated liquid. CONSTITUTION:Org. treating material, such as sewer sludge, is passed through a concentration stage 10 for sewer sludge and is oxidized in a wet oxidization treatment stage 11 consisting of a high pressure pump 101, a compressor 104 for supplying air, a heat exchanger 102, a reactor 103, a gas-liquid separator 105, etc. in a wet oxidation treatment system A and is introduced into a flocculating stage 12. Ferric salt, such as ferric chloride, is added at >=100mg/l, more preferably 500-2,000mg/l in terms of iron by a means 107 for adding and mixing a flocculating agent to the org. treat material L1 accepted in a flocculating and settling tank 106 where the material is flocculated at 2.5-7.0, more preferably 3-5pH. At least a part of the separated liquid L2 thereof is introduced into an anaerobic treatment system B, and is subjected together with the treated material from the other system introduced from a pretreatment stage 13 to an anaerobic digestion treatment 14, dehydration treatment 16 and activated sludge treatment 18.</p> |
