EGSB厌氧发酵垃圾渗滤液制氢的启动特性研究

利用厌氧膨胀颗粒污泥床(EGSB),对生活垃圾堆肥厂初期渗滤液的厌氧生物发酵制氢启动特性进行了研究,探讨了反应器对渗滤液中COD、总氮、总磷的去除效果和产氢能力.结果表明在中温35℃±1℃,有机负荷1.4~16.7 g/(L.d),pH为5.0~5.5的条件下,经过20 d的适应期后,EGSB反应器可以实现连续稳定产氢.在水力停留时间为30 h,液体上升流速为3.0 m/h的稳定运行阶段,最高产氢率为1 460 mL/(L.d),氢气含量为19%~33%,COD去除率为50%~70%,总磷、总氮的去除率稳定在40%~70%、32%~65%.液相末端发酵产物中乙醇和乙酸总含量占挥发性脂肪酸(VFA)总量的80%以上,发酵类型以乙醇发酵型为主.

Start-up of EGSB for Biohydrogen Production from Compost Leachate

An expanded granular sludge bed reactor (EGSB) was employed to evaluate the start-up process of fermentative biohydrogen production from compost leachate. The removal performance of COD, total nitrogen, total phosphorus in leachate as well as the hydrogen production ability of EGSB was investigated.The results showed that at 35℃ ± 1℃,organic loading rate of 1.4-16.7 g/(L·d) ,the main pH of 5.0 to 5.5, the continuous hydrogen production by EGSB reactor using the compost leachate as substrate could be achieved after 20d's acclimatization. Under conditions of HRT of 30 h and liquid flow rate of 3.0 m/h, the COD removal rate of between 50 % to 70 % , the content of hydrogen in the biogas of between 19%-33% ,the maximal hydrogen production rate of 1 460 mL/(L·d) ,total phosphorus and total nitrogen removal rate of between 40 % -70 % and 32 % -65 % respectively, were achieved. The total ethanol and acetic acid content was more than 80 % in liquid end products (VFAs) ,suggesting the main fermentation is ethanol fermentation type.