Magnesium hydroxide modified waste brick, preparation method thereof and application of magnesium hydroxide modified waste brick in artificial wetland system

Abstract

The invention provides a magnesium hydroxide modified waste brick, a preparation method thereof and application of the magnesium hydroxide modified waste brick in an artificial wetland system, and belongs to the field of water environment treatment.The preparation method of the magnesium hydroxide modified waste brick comprises the following steps that 1, building waste bricks are crushed and sieved, and waste brick particles are obtained; (2) carrying out air plasma treatment on the waste brick particles to obtain plasma-etched waste bricks; and (3) dispersing the waste brick subjected to plasma etching into seawater, carrying out first ultrasonic treatment, dropwise adding a sodium hydroxide solution, carrying out second ultrasonic treatment, cleaning, and drying to obtain the artificial wetland filler magnesium hydroxide modified waste brick. The obtained artificial wetland filler magnesium hydroxide modified waste brick is mainly used for preparing an artificial wetland system, and can effectively improve the nitrogen and phosphorus removal efficiency of the artificial wetland and improve the effluent quality.

Description

technical field [0001] The invention belongs to the field of water environment treatment, and in particular relates to magnesium hydroxide modified waste bricks, a preparation method thereof, and an application in artificial wetland systems. Background technique [0002] With the effective control of point source pollution, non-point source pollution has become an important reason that threatens the surface water environment. Among them, nitrogen and phosphorus nutrients are the main pollutants of non-point source pollution. Excessive nitrogen and phosphorus will aggravate the eutrophication of water bodies, cause black and odorous water bodies in cities, and lead to deterioration of water quality. Treatment processes such as constructed wetlands are widely used in the removal of nitrogen and phosphorus from water bodies. Among them, it is of great significance to choose fillers for constructed wetlands with high removal efficiency, long service life, cheap and easy access....

AI Technical Summary

Problems solved by technology

For example, the paper "Research on the Use of Magnesium Hydroxide for Removing Ammonia Nitrogen in Wastewater" uses magnesium hydroxide as the magnesium source and adds phosphate to remove ammonia nitrogen in wastewater. However, magnesium hydroxide powder is easy to lose with water flow and cannot be directly applied to constructed wetlands. among other facilities

As another example, CN108325498A discloses a method for synchronously recovering nitrogen and phosphorus in wastewater by using magnesium hydroxide-modified sepiolite. Magnesium hydroxide-modified sepiolite is used for synchronously recovering nitrogen and phosphorus in wastewater, but it uses MgCl 2 As a magnesium source, the cost of modification is high, and the method is more suitable for loading materials with large porosity itself. For materials with low porosity such as waste bricks, the loading capacity is low, which affects the efficiency of nitrogen and phosphorus removal.

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