微纳米曝气对黑臭水体底泥减量及气溶胶产生的影响

Effect of Micro‑nano Aeration on Reduction and Aerosol Generation of Sediment in the Black‑odorous Water

微纳米曝气是治理黑臭水体的主要方法之一,但目前关于其对底泥减量和气溶胶产生的影响研究有限。为此,以普通曝气与微纳米曝气作为对比,研究了微纳米曝气对黑臭水体底泥减量及气溶胶产生的影响。结果表明,微纳米曝气处理后,有机酸基团和可溶性微生物代谢产物基团成为间隙水中荧光性有机物的主要成分,同时底泥中值粒径减小,有利于后续的减量处理。与普通曝气相比,微纳米曝气对底泥中挥发性固体(VS)和总固体(TS)的去除效果较好,去除率分别为38.88%和27.72%,可实现底泥的原位减量。此外,微纳米曝气组的PM2.5质量浓度和碳质气溶胶浓度均低于普通曝气组。因此,微纳米曝气用于黑臭水体治理时具有提高底泥减量效率和有效控制气溶胶产生的潜力。

Micro‑nano aeration is one of the main methods to control black‑odorous water bodies,but there are limited studies on the effects of aeration on sediment reduction and aerosol generation.In this study,the effects of micro‑nano aeration on sediment reduction and aerosol generation in blackodorous water were investigated by comparing ordinary aeration and micro‑nano aeration.The results showed that the organic acid groups and soluble metabolite groups in the sediment became the main components of fluorescent organic matter in the pore water after micro‑nano aeration treatment,and the median particle size of the sediment was reduced,which was conducive to the subsequent reduction treatment.Micro‑nano aeration had the best effect on the removal of volatile solids(VS)and total solids(TS)in the sediment.The removal rate of VS and TS was 38.88%and 27.72%respectively,which could realize the in‑situ reduction of sediment.In addition,the PM2.5 mass concentration and carbon aerosol concentration of micro‑nano aeration group were lower than those of ordinary aeration group.Therefore,micro‑nano aeration has the potential to improve the sediment reduction efficiency and effectively control the aerosol generation in the treatment of black‑odorous water.