A composite material for efficiently controlling bottom mud phosphorus release and a preparing method thereof

Abstract

A composite material for efficiently controlling bottom mud phosphorus release and a preparing method thereof are disclosed, belonging to the technical field of bottom mud treatment. The method includes fully mixing a mixture consisting of 58% by mass of CaSO4, 2% by mass of AlCl3, 20% by mass of CaCO3 and 20% by mass of quartz sand with a foaming agent and water; allowing the obtained mixture tostand; solidifying the mixture, shaping the product and drying the product, with the mass ratio of the mixture to water being 1:0.8-1.2, and the mass percentage of the foaming agent to water being 0.1%. The method is simple to operate, and the composite material prepared by the method has chemical and physical adsorption effects which are dual effects, can efficiently control bottom mud phosphorusrelease and does not cause an overhigh pH of a water body.

Description

technical field [0001] The invention relates to a composite material for efficiently controlling the release of phosphorus from bottom mud and a preparation method thereof, belonging to the technical field of bottom mud treatment. Background technique [0002] With the rapid development of my country's social economy, population growth and the acceleration of urbanization, the amount of sewage produced is increasing day by day, while the sewage treatment rate in my country is relatively low, resulting in a large amount of untreated sewage that meets the standards directly entering the water body of our country, resulting in serious pollution of water bodies. At present, many water bodies in our country have already experienced serious eutrophication. Phosphorus is one of the key nutrient elements that cause eutrophication in water bodies, and sediment is an important destination and storage pool for phosphorus entering water bodies. When environmental conditions change, pho...

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Problems solved by technology

[0004] Aluminum salts, iron salts and calcium salts are commonly used in in-situ sediment pollution treatment technology, which can inhibit the release of phosphorus in sediments to a certain extent, but single aluminum salts, iron salts When using calcium salts and calcium salts as active ingredients in the in-situ sediment pollution treatment technology to treat contaminated sediments, their inhibitory and removal effects on the release of phosphorus in the sediments are not very satisfactory. In addition, the dosage of Often more, it will cause a substantial increase in the pH of the river water and affect the ORP of the water body and other water quality indicators

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