Field test of methane fermentation system for treating swine wastes
Field test of methane fermentation system for treating swine wastes
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DOI：
10.2166/wst.2002.0415
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发表时间：
2002-01-01
影响因子：
2.7
通讯作者：
Honda, K
中科院分区：
文献类型：
--
作者：
Kataoka, N;Suzuki, T;Honda, K
开发了一种用于处理猪粪的甲烷发酵系统，并成功地在现场试验工厂进行了演示（0.5 m(3)/d）。该系统由螺旋压脱水机、沼气沼气池、污泥分离器、氧化沟（OD）和堆肥设备组成。采用螺旋压脱水机进行物理预处理，对预处理后的污泥进行甲烷发酵，对消化出水进行OD、总固体（TS）和化学需氧量（CODCr）的去除率分别为38%和22%。筛分的性能为：含水率57%，着火损失93%，比重0.33。经预处理的强浆料在中温条件下进行消化。消化气（沼气）产率为26 m(3)/m(3)-浆（NTP），沼气的甲烷含量为67%。在35℃的温度下，对污泥进行甲烷发酵处理，CODCr去除率为65%。当NH4+-N浓度在3000 mg/l以下时，该体系对甲烷发酵反应无抑制作用。目前中试规模研究的质量平衡表明，1 m(3)的猪粪便和尿液混合物（TS 90 kg/m(3)）被生物转化为25 m(3)/m(3)的沼气浆（NTP）（甲烷含量67%），100 kg堆肥（含水量40%）。燃烧损失75%)，处理水0.80 m(3) （SS 30-70 mg/l）。
A methane fermentation system for treating swine wastes was developed and successfully demonstrated in a field test plant (0.5 m(3)/d). The system was composed of a screw-press dehydrator, a methanogenic digester, a sludge separator, an oxidation ditch (OD) and composting equipment. A performance evaluation was carried out regarding physical pre-treatment using the screw-press dehydrator, methane fermentation for pre-treated slurry, and post-treatment for digested effluent by OD, Total solids (TS) and chemical oxygen demand (CODCr) removal by the screw-press pre-treatment were 38% and 22%, respectively. Properties of the screenings were as follows: water content 57%, ignition loss 93%, specific gravity 0.33. The pretreated strong slurry was digested under mesophilic conditions. Digestion gas (biogas) production rate was 26 m(3)/m(3)-slurry (NTP) and methane content of the biogas was 67%. CODCr removal of 65% with methane fermentation treatment of the slurry operating at 35degreesC was observed. No inhibition of methane fermentation reaction occurred at the NH4+-N concentration of 3,000 mg/l or less during methane fermentation by the system. Mass balance from the present pilot-scale study showed that 1 m(3) of mixture of excrement and urine of swine waste (TS 90 kg/m(3)) was biologically converted to 25 m(3)/m(3)-slurry (NTP) of biogas (methane content 67%), 100 kg of compost (water content 40%. ignition loss 75%), and 0.80 m(3) of treated water (SS 30-70 mg/l).