Kataoka N, Suzuki T, Ishida K, Yamada N, Kurata N, Katayose M, Honda K
Biotechnology Laboratory, Ebara Research Co., Ltd., 2-1, Honfujisawa 4-chome, Fujisawa-shi 251-8502, Japan.
Water Sci Technol. 2002;45(12):103-12.
A methane fermentation system for treating swine wastes was developed and successfully demonstrated in a field test plant (0.5 m3/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 25 m3/m3-slurry (NTP) and methane content of the biogas was 67%. CODCr removal of 65% with methane fermentation treatment of the slurry operating at 35 degrees C 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 m3 of mixture of excrement and urine of swine waste (TS 90 kg/m3) was biologically converted to 25 m3/m3-slurry (NTP) of biogas (methane content 67%), 100 kg of compost (water content 40%, ignition loss 75%), and 0.80 m3 of treated water (SS 30-70 mg/l).
开发了一种用于处理猪粪的甲烷发酵系统，并在现场试验工厂（0.5立方米/天）中成功进行了示范。该系统由螺旋压榨脱水机、产甲烷消化器、污泥分离器、氧化沟（OD）和堆肥设备组成。对使用螺旋压榨脱水机进行的物理预处理、对预处理后的浆液进行的甲烷发酵以及通过OD对消化后的出水进行的后处理进行了性能评估。螺旋压榨预处理对总固体（TS）和化学需氧量（CODCr）的去除率分别为38%和22%。筛余物的特性如下：含水量57%，烧失量93%，比重0.33。预处理后的浓浆液在中温条件下进行消化。消化气（沼气）产率为25立方米/立方米-浆液（NTP），沼气中的甲烷含量为67%。在35摄氏度下对浆液进行甲烷发酵处理时，观察到CODCr去除率为65%。在系统进行甲烷发酵期间，当NH4(+)-N浓度为3000毫克/升或更低时，未发生甲烷发酵反应的抑制。本次中试规模研究的质量平衡表明，1立方米猪粪尿混合物（TS 90千克/立方米）被生物转化为25立方米/立方米-浆液（NTP）的沼气（甲烷含量67%）、100千克堆肥（含水量40%，烧失量75%）和0.80立方米处理水（SS 30 - 70毫克/升）。
