Preparation method of active covering plate for synchronously controlling nitrogen and phosphorus release of bottom mud

Abstract

The invention discloses a preparation method of an active covering plate for synchronously controlling nitrogen and phosphorus release of bottom mud. The preparation method comprises the following steps: (1) naturally air-drying sludge of a water purification plant, and calcining to obtain a sludge block; (2) the sludge blocks are subjected to mechanical crushing and mechanical vibration screening, and the aluminum-based phosphorus locking agent is prepared; (3) adding the aluminum-based phosphorus locking agent, cement, zeolite and water into a stirrer according to a ratio, uniformly mixing, and standing to obtain a base material; (4) the base material is added into a mold frame to be pressed; (5) after compression molding, standing and demolding to obtain a cover plate; and (6) standing the cover plate finished product under a natural open air condition for engineering application. The active covering plate prepared by the invention not only can synchronously control the release of nitrogen and phosphorus in bottom mud, but also has the advantages of washing resistance, good water permeability, high water retention and the like, and solves the problems of non-uniform covering, flood washing loss and the like of a granular covering material; the prepared active covering plate can be recycled, cyclic utilization of resources is promoted, meanwhile, the process is simple, operation is convenient, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of municipal water supply sludge resource treatment technology, and in particular relates to a preparation method of an active cover plate for synchronously controlling nitrogen and phosphorus release from bottom mud. Background technique [0002] With the progress of our society and the development of industry, the ecological environment of urban river water bodies is deteriorating year by year, especially the problem of eutrophication of river water bodies is particularly prominent. Eutrophication of water body refers to that under the influence of human activities, nutrients such as nitrogen and phosphorus needed by organisms enter slow-flowing water bodies such as lakes, rivers, lakes, bays, etc., causing algae and other plankton to multiply rapidly, and the amount of dissolved oxygen in water bodies decreases , the deterioration of water quality and the mass death of fish and other organisms. Under nat...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects existing in the prior art, and to provide a method for preparing an active covering plate for synchronously controlling the release of nitrogen and phosphorus from the sediment, which is obtained by calcining, pulverizing and screening sludge from a water purification plant or waterworks Aluminum-based phosphorus-locking agent, mixed with cement and zeolite and then pressed into an active covering plate to cover the river sediment, not only can simultaneously control the release of nitrogen and phosphorus from the sediment, but also has erosion resistance, good water permeability, and water retention High advantages, it solves the problems of uneven coverage of granular covering materials and flood erosion loss

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