催化过氧化钙/臭氧化深度氧化工艺对城市污水处理污泥的高效消化及脱水性的改善

IF 6.5 Q2 ENGINEERING, ENVIRONMENTAL
Abdolmotaleb Seid-Mohammadi , Ghorban Asgari , Reza Shokoohi , Alireza Rahmani , Fatemeh Sahraei , Amir Shabanloo
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引用次数: 0

摘要

在生活污水的生物处理过程中,会产生大量的污泥,污泥具有较高的腐败率和微生物负荷,因此必须考虑其处理和稳定化工艺。采用催化过氧化钙/臭氧氧化(CaO2/O3)高级氧化工艺对哈马丹污水处理厂的污泥进行化学稳定研究。研究了废水pH、CaO2催化剂投加量、臭氧投加量和反应时间等重要操作变量对挥发性固体(VS)和挥发性悬浮固体(VSS)去除率的影响。此外,还研究了污泥体积指数(SVI)、污泥含水量、比过滤阻力(SRF)的降低以及大肠菌群的减少。最佳操作条件为pH = 9,催化剂CaO2用量为1 g/L,臭氧用量为2 g/h,反应时间为60 min,在此条件下VS和VSS的去除率分别达到90%和80%以上。污泥的SVI小于80 mL/g,具有良好的重力沉降条件。动力学分析表明,在集成的CaO2/O3中,O3和CaO2的相互作用由于协同效应,使污泥COD去除率提高了52.11%左右。反应后污泥含水率由85.67%降至46.54%。另一方面,在优化条件下,SRF也降低了约40%。通过场发射扫描电镜(FESEM)图像观察到臭氧、羟基自由基和其他活性氧(ROSs)对污泥颗粒的协同作用,其对污泥颗粒的破坏作用明显。根据本研究结果,CaO2催化臭氧化系统可以作为哈马丹污水处理厂污泥处理的合适工艺。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Efficient digestion and improvement of dewaterability of municipal wastewater treatment sludge through catalytic calcium peroxide/ozonation advanced oxidation process

Efficient digestion and improvement of dewaterability of municipal wastewater treatment sludge through catalytic calcium peroxide/ozonation advanced oxidation process
In the biological treatment process of sanitary wastewater, a large amount of sludge is produced, which has a high spoilage and microbial load, so its treatment and stabilization processes must be considered. The present study aimed to chemically stabilize sludge from the Hamadan wastewater treatment plant using the advanced oxidation process of catalytic calcium peroxide/ozonation (CaO2/O3). The effect of important operational variables such as wastewater pH, CaO2 catalyst dosage, ozone dosage, and reaction time on volatile solids (VS) and volatile suspended solid (VSS) removal was studied. Also, the reduction of sludge volume index (SVI), sludge water content, and specific resistance to filtration (SRF), as well as the reduction of coliforms, were studied. The best operating conditions were obtained at pH = 9, a catalyst CaO2 dose of 1 g/L, an ozone dosage of 2 g/h, and a reaction time of 60 min. The removal of VS and VSS under these conditions was above 90 % and 80 %, respectively. Also, the SVI of the sludge reached less than 80 mL/g, which suggests a good gravity-settling condition. Kinetic analysis revealed that the interaction of O3 and CaO2 in the integrated CaO2/O3 improves sludge COD removal efficiency by around 52.11 % due to their synergistic effect. The water content of the sludge after the reaction decreased from 85.67 % to 46.54 %. On the other hand, the SRF also decreased by about 40 % under the optimized conditions. The synergistic effect of ozone, hydroxyl radicals, and other reactive oxygen species (ROSs) on sludge particles was observed with field emission scanning electron microscopy (FESEM) images, which was clearly evident as destructive effects on sludge particles. According to the results of this research, a catalytic ozonation system with CaO2 can be used as a suitable process to manage the treatment of sludge in the Hamadan wastewater treatment plant.
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来源期刊
Cleaner Engineering and Technology
Cleaner Engineering and Technology Engineering-Engineering (miscellaneous)
CiteScore
9.80
自引率
0.00%
发文量
218
审稿时长
21 weeks
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