生物淋滤-Fenton对印染污泥脱水性能的影响

Influence of bioleaching-Fenton oxidation on textile dyeing sludge dewatering performances

采用嗜酸性硫杆菌生物淋滤联合Fenton氧化法对印染污泥脱水性能进行了研究。结果表明,生物淋滤过程中pH下降速率随着硫粉添加量增加而变快,经生物淋滤处理后污泥的脱水性能在一定程度上得到了改善。对生物淋滤后的污泥进行了Fenton氧化处理,获得的最佳反应条件为反应时间2 h,H2O2和Fe2+添加量分别为6 g/L和0.5 g/L。在该条件下,污泥上清液中总有机碳(TOC)由20.8 mg/L增加到356.6 mg/L;污泥比阻(SRF)和滤饼含水率分别由5.98×1011s2/g和88.75%减少至1.26×1011s2/g和82.85%。生物淋滤-Fenton氧化法在污泥破解程度和脱水性能改善方面均优于单独Fenton氧化法。

Bioleaching combined with Fenton oxidation was used to investigate dewaterability of textile dye- ing sludge. The results showed that with the use of acidophilie thiobacilli during sludge bioleaching,pH decreased quickly with the increase of sulfur dosage and sludge dewaterability was enhanced to some extent by bioleaehing. The optimal experimental conditions for bioleaching-Fenton oxidation of the textile dyeing sludge were as follows ： reaction time of 2 h, H2 O2 dosage of 6 g/L and Fe2＋ dosage of 0.5 g/L. Under these conditions,the values of total organic carbon （TOC） in the supernatant increased from 20.8 mg/L to 356.6 mg/L; and specific resistance to filtration （SRF） and moisture of sludge cake decreased from 5.98 × 10^11 s2/g and 88.51% to 1.26 × 10^11 s2/g and 82.85% ,respectively. Bioleaching-Fenton oxidation showed more advantages in sludge disruption and dewa- terability over single Fenton oxidation.