Effect of pretreatment of dilute hydrochloric acid on anaerobic digestion of rice straw
稀盐酸预处理对稻草厌氧消化的影响

In order to investigate the effect of pretreatment of dilute acid on anaerobic digestion of rice straw the rice straw was anticipated with the different concentration hydrochloric acid solutions. The variations of biogas production, methane content, COD, pH and volatile fatty acid (VFA) were studied under the complete mixture anaerobic condition. The results showed that the concentration increase of the diluted hydrochloric acid solution can improve the effectiveness of anaerobic digestion for straw. After pretreatment with 4%, 8% and 12% of hydrochloric acid solution, the total gas production increased by 80.8%, 110.8% and 241.3%,respectively. Methane contents in gas increased by 8.2%, 9.2% and 11.7%,respectively. Removal rate of volatile solid (VS) increased by 6.9%, 12% and 13.7%,respectively and that of COD in digestion solution increased by 23.9%, 39% and 44%, respectively.