Improvement of the Biogas Production by Anaerobic Two-stage Commercialized Process from Pig Farm Wastewater

• Main Authors: LO CHIN, 羅敬
• Other Authors: Shu-Yii Wu
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/p36g25

碩士 === 逢甲大學 === 綠色能源科技碩士學位學程 === 107 === Taiwan's animal husbandry wastewater is one of the main causes of river pollution. In the traditional livestock wastewater treatment method, there are still some problems, such as low biogas production, post-treatment of sludge, and low efficiency of wastewater treatment. Bio-anaerobic fermentation produces biogas technology, which converts waste water that would otherwise be discharged into energy, recycles and reuses wastewater and sludge, and produces biogas while treating sewage. Therefore, this technology is applied to a new type of livestock wastewater treatment plant. Then, the gas produced by the production of biogas is purified to carry out biogas power generation to achieve the purpose of energyizing waste water. This study is to produce biogas at the commercial scale of anaerobic two-stage digestion in Xinhexing Ranch in central Taiwan. It will be monitored for a long time from September 2018 to July 313 in 313 days. The source of the substrate is from the farm. The average chemical oxygen demand of pig manure and urine wastewater was 70.4 g COD/L, average suspended solids (TS) 62.5 g/L, average suspended solids (SS) 59.4 g/L, average volatile solids (VS) 44.9 g/ L and the average total sugar 1.7 g total sugar/L. During the monitoring period, the average number of pigs in the head is 1,500, and the average amount of wastewater per day is 60 m3/d. The wastewater treatment steps include collection tank, mixing tank, pre-anaerobic tank, main anaerobic tank, primary sedimentation tank, and exposure. The gas pool and the final settling tank are discharged to the discharge tank after these procedures. The volume of the front anaerobic tank is 60 m3, the hydraulic retention time (HRT) is 24 hours, and the average monitoring temperature and pH value are 30 ° C and 7.0 respectively. . The main anaerobic tank has a volume of 600 m3, a hydraulic retention time of 240 hours, and a temperature and pH of 30 ° C and 7.5, respectively. During the 313 days of operation, the average removal rate of COD in the anaerobic two-stage inflow and outflow was 96.7%, the average TS removal rate was 98%, the average SS removal rate was 99.7%, and the average VS removal rate was 99.0%. The biomethane content is 81.3% and the average biogas production rate is 185 m3/d.