Method and system for in-situ remediation of river sediment polycyclic aromatic hydrocarbon pollution by ozone micro-nano bubble-ultrasonic wave

Abstract

The invention relates to a method and system for in-situ remediation of sediment polycyclic aromatic hydrocarbon pollution in a river through cooperation of ozone micro-nano bubbles and ultrasonic waves. The system mainly comprises an ozone generator, an ozone micro-nano bubble generator, an online detection system, a PC control system, an ultrasonic generator, a wastewater treatment device, a crane and the like. Hydrophobic organic pollutants are desorbed from sediments through ultrasonic waves generated by an ultrasonic generator, the deposited pollutants are kept in a suspended state, and meanwhile ozone micro-nano bubbles are injected for adsorption and oxidative degradation of the organic pollutants; each parameter of the reaction chamber is monitored and analyzed in real time through an online detection system, the aeration rate, the bubble diameter, the ultrasonic power and the ultrasonic time of ozone micro-nano bubbles are adjusted in time, and finally water in the sediment treatment chamber is pumped to a wastewater treatment device on a barge for further treatment. According to the method, in-situ remediation of hydrophobic organic pollutant polycyclic aromatic hydrocarbon in the river sediment is achieved, and secondary pollution is reduced.

Description

Technical field [0001] The present invention is in the field of application of water ecological restoration. [0002] technical background [0003] Deposits are an important part of the river ecosystem, provides a place for the growth of aquatic plants and animals. In recent years, the majority of river sediments contaminated by persistent hydrophobic organic pollutants, causing serious environmental damage and health risks. When the ambient conditions change, sediment enriched in hydrophobic organic pollutants will be released again to the overlying water column, causing secondary pollution, health damage to aquatic ecosystems. Currently there are repair sediments contaminated rivers and ectopic situ repair technology. Ectopic repair repair techniques have the advantage of high efficiency, but in the face of the actual complex environment, remote repair method is not always feasible. As used excavated contaminated sediments transported off-site repair method, since the lower most...

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Problems solved by technology

Ex-situ repair technology has the advantages of high repair efficiency, but in the face of complex environments in practice, the off-site repair method is not always feasible

If the remediation method of excavating and transporting polluted sediment to a different place is used, since most of the pollutants are buried in the lower layer of the sediment, through excavation, the pollutants may be resuspended and exposed to the river water

In-situ remediation technology can prevent the occurrence of secondary pollution in off-site remediation, but due to the large amount of hydrophobic organic pollutants adsorbed in the sediment, the self-desorption ability is poor, and the concentration in the water phase is low, which limits the efficiency of in-situ remediation.

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