污泥厌氧催化快速发酵产VFAs的试验研究
- 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:
-
分析了超声预处理与投加表面活性剂联合技术加快剩余污泥厌氧发酵产挥发性脂肪酸（VFAs）的速度。通过单因素试验研究了表面活性剂种类、投加量、初始pH值、发酵时间、温度以及外加厌氧菌种对产VFAs的影响。试验结果表明，相同条件下，当正己基烷基糖苷（APG）、脂肪醇聚氯乙烯醚（JFC）、鼠李糖（TDP）作为表面活性剂时，APG产酸量最高；在超声预处理后，当APG用量为0.8 g/600 mL、初始pH值为11、发酵时间为4 d、发酵温度为35 ℃且不添加厌氧菌种时，最大产酸量为1 300 mg/L(以COD计)；添加厌氧菌种后，最大产酸量为3 650 mg/L，产酸量较之前提高了3倍，且VFAs中乙酸的含量也达到最大。
- 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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