Effect of low-intensity ultrasound on treatment of low-strength wastewater and sludge characteristics using ABR

doi:10.16085/j.issn.1000-6613.2020-2264

Abstract

Abstract:

In order to explore the strengthening effect of low-intensity ultrasound on the anaerobic biological treatment of low-strength wastewater, a research on the improvement of organic matter removal by ultrasonic irradiation of anaerobic sludge in anaerobic baffled reactor (ABR) was carried out. The effects of ultrasound on sludge yield, extracellular polymeric substances (EPS), enzyme activity, sludge particle size, sludge surface functional groups and microscopic morphology were further studied.The results showed that low-intensity ultrasound could improve the removal of organic matter in low-strength wastewater by ABR. The removal efficiency of chemical oxygen demand (COD) in the ultrasound group was 5.2% higher than that of the control group. The COD concentration of the effluent could meet the first-class A standard in the Pollutant Discharge Standard for Urban Sewage Treatment Plants (GB18918—2002). After periodic ultrasound, the total suspended solids (TSS) and volatile suspended solids (VSS) of each compartment of the ultrasound group were lower than those of the control group, but the VSS/TSS ratio was higher. The EPS increased in the ultrasound group, while the loosely bound EPS (LB-EPS) and tightly bound EPS (TB-EPS) increased. The protein (PN) content increased but the polysaccharide (PS) content decreased. The dehydrogenase activity (DHA) of each compartment of the ultrasound group was 26.43mgTF/(gVSS·h), 23.43mgTF/(gVSS·h), 21.87mgTF/(gVSS·h), 19.55mgTF/(gVSS·h), while the control group was 18.13mgTF/(gVSS·h), 17.01mgTF/(gVSS·h), 13.56mgTF/(gVSS·h), 9.90mgTF/(gVSS·h). Ultrasound greatly improved the activity of anaerobic sludge dehydrogenase. Ultrasonic treatment reduced the particle size of the sludge, but there was basically no change in the types of surface functional groups. Scanning electron microscope (SEM) observation showed that filamentous bacteria were the dominant strain on the sludge surface of each compartment in the control group, while cocci were the dominant strain on the sludge surface of each compartment in the ultrasound group.

Key words: low-intensity ultrasound, low-strength wastewater, anaerobic, reactor, surface, extracellular polymer substance

摘要：

为探究低强度超声波对厌氧生物处理低浓度污水的强化作用，本文在厌氧折流板反应器（ABR）中开展超声波辐照厌氧污泥提高有机物去除效果的研究，并进一步研究了反应器稳定期超声波对污泥量、胞外聚合物（EPS）、酶活性、污泥粒径、污泥表面官能团及微观形貌的影响。结果表明，低强度超声波可提高ABR处理低浓度污水有机物去除效果，超声组出水化学需氧量（COD）去除率较对照组提高5.2%，出水COD浓度可满足《城镇污水处理厂污染物排放标准》（GB18918—2002）中一级A排放标准。周期性超声后，超声组各隔室总悬浮固体（TSS）、挥发性悬浮固体（VSS）均低于对照组，但具有更高的VSS/TSS。超声组污泥EPS的总量增加，松散结合型EPS（LB-EPS）、紧密结合型EPS（TB-EPS）均增加，蛋白质（PN）含量增加，多糖（PS）含量减少。超声组各隔室脱氢酶活性（DHA）分别为26.43mgTF/(gVSS·h)、23.43mgTF/(gVSS·h)、21.87mgTF/(gVSS·h)、19.55mgTF/(gVSS·h)，而对照组各隔室分别为18.13mgTF/(gVSS·h)、17.01mgTF/(gVSS·h)、13.56mgTF/(gVSS·h)、9.90mgTF/(gVSS·h)，超声大大提高了厌氧污泥脱氢酶活性。超声处理使污泥粒径减小，但表面官能团种类基本没有变化。电镜观察发现，对照组各隔室污泥表面以丝状菌为优势菌种，而超声组各隔室污泥表面以球菌为优势菌种。

关键词: 低强度超声波, 低浓度污水, 厌氧, 反应器, 表面, 胞外聚合物

CLC Number:

X703.1

LI Xin, ZHU Yichun, LIAN Junfeng, QIN Xinxin, TIAN Shuai. Effect of low-intensity ultrasound on treatment of low-strength wastewater and sludge characteristics using ABR[J]. Chemical Industry and Engineering Progress, 2021, 40(11): 6401-6408.

李鑫, 朱易春, 连军锋, 秦欣欣, 田帅. 低强度超声波对ABR处理低浓度污水效果及污泥特性的影响[J]. 化工进展, 2021, 40(11): 6401-6408.

Figures/Tables 8

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