Method for preparing novel water permeable bricks from river branch bottom mud

Abstract

The invention discloses a method for preparing novel water permeable bricks from river branch bottom mud. The method includes steps of smashing cement, fly ash and apatite to obtain dry mixtures; adding the obtained dry mixtures, the bottom mud and nanoscale zero-valent iron suspension loaded ceramsite into water, mixing and stirring the dry mixtures, the bottom mud, the nanoscale zero-valent ironsuspension loaded ceramsite and the water, carrying out aging and carrying out compressing to obtain green bricks; watering and naturally curing the green bricks to obtain the novel water permeable bricks which are finished products. The method has the advantages that the river branch bottom mud is sufficiently utilized, accordingly, solid waste can be recycled, and the problem of expense due tosludge stacking and treating can be solved; the rhamnolipid coated ceramsite with zero-valent iron suspension is added into the river branch bottom mud, accordingly, heavy metal in sludge can be passivated and can be immobilized in the novel water permeable bricks, and the problem of pollution due to the heavy metal in the river branch bottom mud can be solved to a certain extent; the novel waterpermeable bricks prepared by the aid of the method are good in permeability and high in strength, roasting can be omitted, and accordingly production energy consumption can be reduced; the novel waterpermeable bricks contain the multifunctional ceramsite, accordingly, heavy metal can be passivated, and water and other harmful substances further can be adsorbed; the prepared novel water permeablebricks can be laid on sidewalks or can be used for constructing walls along shores of river channels, and accordingly the method has important significance in accelerating sponge city construction.

Description

technical field [0001] The invention relates to the technical field of sponge cities, and more particularly relates to a method for preparing novel permeable bricks by using river bottom mud. Background technique [0002] In recent years, the central government has attached great importance to the problem of urban rain and floods and the comprehensive improvement of urban water environment. From the perspective of promoting the construction of "sponge cities", it has proposed to use low-impact development methods to treat black and odorous water bodies in urban rivers according to local conditions, so as to effectively alleviate urban waterlogging. , Protect and improve the urban water ecological environment. Due to structural changes in the land use pattern during the urbanization process, the original permeable areas (farmland, forest, grassland) are constantly replaced by concrete buildings, asphalt pavement, etc., resulting in excessive hardening of the underlying surfac...

AI Technical Summary

Problems solved by technology

However, the removed sediment contains a large amount of heavy metals. How to dispose of the contaminated sediment so that it no longer becomes pollution is a hot and difficult point in current research.