污泥厭氧催化快速發(fā)酵產(chǎn)VFAs的試驗(yàn)研究
- Title:
- Rapid Production of VFAs in Catalyzed Anaerobic Fermentation of Sludge
- Keywords:
-
waste activated sludge; anaerobic fermentation; font-size: 10pt; ">volatile fatty acids; surfactant; ultrasound
摘要:- 分析了超聲預(yù)處理與投加表面活性劑聯(lián)合技術(shù)加快剩余污泥厭氧發(fā)酵產(chǎn)揮發(fā)性脂肪酸（VFAs）的速度。通過單因素試驗(yàn)研究了表面活性劑種類、投加量、初始pH值、發(fā)酵時(shí)間、溫度以及外加厭氧菌種對(duì)產(chǎn)VFAs的影響。試驗(yàn)結(jié)果表明，相同條件下，當(dāng)正己基烷基糖苷（APG）、脂肪醇聚氯乙烯醚（JFC）、鼠李糖（TDP）作為表面活性劑時(shí)，APG產(chǎn)酸量最高；在超聲預(yù)處理后，當(dāng)APG用量為0.8 g/600 mL、初始pH值為11、發(fā)酵時(shí)間為4 d、發(fā)酵溫度為35 ℃且不添加厭氧菌種時(shí)，最大產(chǎn)酸量為1 300 mg/L(以COD計(jì))；添加厭氧菌種后，最大產(chǎn)酸量為3 650 mg/L，產(chǎn)酸量較之前提高了3倍，且VFAs中乙酸的含量也達(dá)到最大。
Abstract:-
The combined technology of ultrasonic pretreatment and adding surfactant was used to accelerate the production of volatile fatty acids (VFAs) in anaerobic fermentation of waste activated sludge.The effects of surfactant type and dosage, initial pH value, fermentation time, temperature and additional anaerobic bacteria on VFAs yield were explored by single factor experiments. When APG, JFC and TDP were used as surfactants, the acid yield of APG was the highest under the same conditions. When the dosage of surfactant was 0.8 g/600 mL, the initial pH value was 11, the fermentation time was 4 days, the fermentation temperature was 35 ℃ and no anaerobic bacteria was added, the maximum acid yield was 1 300 mg/L(in terms of COD) after ultrasonic pretreatment. When anaerobic bacteria were added, the maximum acid yield was 3 650 mg/L, which was three times higher than before, and the acetic acid content in VFAs was the largest.
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