污泥热解液与牛粪混合厌氧消化特性研究

为处理污泥热解液并利用其中所含的能量，研究了250~550℃温度下产生的污泥热解液单独厌氧发酵和与牛粪混合厌氧消化的特性.首先研究250~550℃热解液单独厌氧发酵的情况，发现各温度下热解液可发酵、且350℃下热解液产气性能相对较好；但是总体上产气量很少.其次以250℃下的热解液为例，研究与牛粪在高温（55±1）℃]下混合厌氧发酵时不同质量比（5/80，10/80，15/80；g/g）的影响，发现热解液在一定程度上抑制了牛粪的厌氧发酵，且热解液的量越大抑制作用越明显.第三步选择最低的热解液添加量比5/80，研究热解温度（250~550℃）对混合物厌氧发酵的影响；结果表明，350℃下的热解液与牛粪混合厌氧发酵累计产气量最高，达116.42mL/g VS，高于纯牛粪对照组的110.36mL/g VS；其他依次是550℃组、450℃组和250℃组.另外，550℃组的总挥发性脂肪酸（TVFA）的初始值最高，为1528mg/L，发酵后降低至254mg/L，为最大降幅，证明污泥热解液中的有机物得到有效降解.因此，适当热解温度下的污泥热解液可以适量与牛粪进行混合厌氧发酵，为污泥热解液处理和能源化提供新出路.

Anaerobic co-digestion of the sewage sludge pyrolysis liquids and cow dung under thermophilic condition

In order to treat sewage sludge pyrolysis liquid (SS-PL) and recover its energy, the anaerobic digestion of SS-PL produced in the temperature range of 250~550℃ and co-digestion of SS-PL with cow dung (CD) were studied. Firstly, SS-PL produced at 250℃~550℃ were inoculated to verify whether they can be digested. The results showed that SS-PL would produce some biogas; and the SS-PL produced at 350℃ (PL350) had the highest biogas yield; but for all of the SS-PLs their biogas yields are very little. Therefore, SS-PL produced at 250℃(PL250) was adopted as an example to mix with CD by different mass ratio (5/80, 10/80, 15/80; g/g) for co-digestion at (55±1)℃; and it has been found that PL250 inhibited the anaerobic digestion of CD; the higher the PL250/CD mass ratio, the more serious the inhibitory effect was. Then in the next step, SS-PLs produced at four different pyrolysis temperatures (PL250, PL350, PL450 and PL550) were mixed with CD respectively by ratio of 5/80 and subjected to anaerobic digestion under 55±1℃ to check the influence of pyrolysis temperature. The results showed that the biogas generation from the mixture of PL350 and CD was the highest (116.42mL/g VS), it was even higher than that of the controlled group (CD alone), which was 110.36mL/g VS, the followed sequences are mixtures added with PL550, PL450 and PL250 respectively. In addition, the total volatile fatty acid (TVFA) in the mixture group of PL550/CD was the highest in the beginning (1528mg/L), but reduced to 254mg/L after digestion, proving that the organic matter in SS-PLs was effectively decomposed. Generally SS-PL produced at an appropriate temperature can be co-digested with CD at a suitable blending ratio, providing a new alternative for its disposal and energy recovery.