Abstract:

In the northern district of Alar city in the southern region, the presence of numerous textile printing and dyeing factories results in the generation of complex wastewater with high salinity due to the substantial water usage during the dyeing process. Consequently, it is of significant importance to investigate biological treatment technologies of degrading ultra-high salinity wastewater. Two sequencing batch reactors (SBRs) with a height-to-diameter ratio (R _H/D) of 7.5 were inoculated with municipal activated sludge, and artificial simulated wastewater (with a salinity mass fraction of 10%, prepared by solid NaCl) was used as the influent. Two operating modes of intermittent sludge application (S1) and no sludge application (S2) were implemented. The analysis focused on the sludge morphology, pollutant removal performance, and the mechanism of maintaining granular structure stability during the granulation process of municipal sludge in ultra-high salinity wastewater. It was found that salt-tolerant aerobic granular sludge could eventually be formed through both intermittent sludge application and no sludge application, with granulation times of 43 days and 55 days, respectively. After the formation of salt-tolerant aerobic granular sludge, MLSS in S1 and S2 were approximately 4.5, 4.11 g/L, SVI₃₀ were 20.8, 45.4 mL/g, and the corresponding granule sizes were 4 834.5, 3 686.2 µm, respectively, with the sludge morphology of oval-shaped. The protein secondary structure α-helix/(β-sheet+random coil) in the sludge granule EPS were about 0.685 (S1) and 0.699 (S2), and the hydrophobicity of the sludge granules was enhanced. The average removal rates of COD, TP, and NH₄ ⁺-N in the wastewater by the intermittent sludge application reactor were 81.50%, 57.40%, and 93.30%, respectively, which were higher than the removal rates of pollutants in the no sludge application reactor. The intermittent sludge application was demonstrated to effectively shorten the time for sludge granulation, maintain the integrity of the granules, and strengthen the removal of pollutants, offering a new approach for the treatment of high-salinity wastewater.

Key words: salt-tolerant aerobic granular sludge, SBR, intermittent sludge application, decontamination performance, ultra-high salinity wastewater

摘要：

南疆阿拉尔市北区印染厂较多，印染过程用水量大，产生的废水成分复杂，且属于高盐废水，研究开发可处理超高盐废水的生物处理技术显得尤为重要。在两组高径比（R _H/D）为7.5的序批式反应器（SBR）内接种市政活性污泥，进水为人工模拟废水（盐度质量分数10%，固体NaCl配制），采用间歇施泥（S1）和不施泥（S2）两种操作方式运行，分析市政污泥在超高盐废水中颗粒化过程中污泥形态、除污性能及间歇施泥维持颗粒结构稳定性的机制。结果表明：间歇施泥和不施泥运行最终均能形成耐盐好氧颗粒污泥，颗粒形成时间分别为43 d和55 d；耐盐好氧颗粒污泥形成后，S1、S2中MLSS分别约为4.5、4.11 g/L，SVI₃₀分别为20.8、45.4 mL/g，对应颗粒粒径分别为4 834.5、3 686.2 µm，污泥形态为卵状；污泥颗粒EPS中蛋白质二级结构α-螺旋/（β-折叠+无规卷曲）约为0.685（S1）和0.699（S2），污泥颗粒的疏水性增强；间歇施泥反应器中废水COD、TP、NH₄ ⁺-N平均去除率分别为81.50%、57.40%、93.30%，高于不施泥反应器中各污染物去除率。间歇施泥的应用可以有效缩短污泥颗粒化时间，维持颗粒的完整性，强化对污染物的去除，为高盐废水的处理提供新的思路。

关键词: 耐盐好氧颗粒污泥, SBR, 间歇施泥, 除污性能, 超高盐废水

CLC Number: 

• X703