Method for in situ removal of polycyclic aromatic hydrocarbons from river water system sediments

Abstract

The present invention discloses a method for in situ removal of polycyclic aromatic hydrocarbons from river water system sediments. According to the method, ultrasonic adsorption combination equipment is placed in river water system sediments containing PAHs, zoobenthos are stocked in a treated area to activate the activity of the microorganisms in the sediments, and a submerged plant Myriophyllum verticillatum L is planted in the treated area and / or Lolium perenne L is subjected to shallow water planting, such that the PAHs in the river sediments are removed on the basis of the in situ and the un-changed river water system natural ecological environment through the physical, chemical, biological integrated combination way while the activities of the aquatic organisms and the aquatic plants are improved, and the water system is purified; and the pollutant reducing and eliminating can be achieved in the in situ manner without the movement of the sediments, the additional construction of the treatment place and the destroy on the water body sediment natural environment, the operation is simple, and the operation cost is low.

Description

technical field [0001] The invention belongs to the technical field of organic pollution treatment. The invention relates to a method for treating organic pollutants in river water system sediments, in particular to a method for in-situ removal of polycyclic aromatic hydrocarbons in river water system sediments. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) refer to hydrocarbons containing more than two benzene rings, which are persistent pollutants in surface water. Due to their low water solubility and high octanol-water partition coefficient, they are easily distributed from the water phase. Into sediments and organic matter, therefore, it is ubiquitous in surface water, estuaries, coastal ecological environment, soil and other environmental systems, with more than 100 types. In 1979, the U.S. Environmental Protection Agency listed 16 kinds of PAHs as organic pollution for priority control. object blacklist. Due to the rapid development of social ...

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Problems solved by technology

[0004] In order to solve the existing problems of removing PAHs pollution in river water system sediments in the prior art, the present invention discloses a method for in-situ removal of polycyclic aromatic hydrocarbons in river water system sediments, through the combination of physics, chemistry and biology , on the basis of in situ and without changing the natural ecological environment of the river system, PAHs in the sediments of the river system are removed, and at the same time, the activity of aquatic organisms and aquatic plants in the river is improved, and the water system is purified; it can be used without moving sediments and without The construction of additional treatment sites and the condition of basically not destroying the natural environment of water body sediments can realize the reduction and elimination of pollutants in situ, and the operation is simple and the operation cost is low

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