Method for preparing nitrogen and phosphorus removal adsorbent from sludge of water plant

Abstract

The invention discloses a method for preparing a nitrogen and phosphorus removal adsorbent from sludge of a water plant. The method comprises steps as follows: dewatered aluminum sludge is air-dried, ground, sieved, dried, cooled and then placed in a muffle furnace to be roasted at the temperature of 300 DEG C for 4 h, and activated aluminum sludge is obtained; powdery activated carbon, the activated aluminum sludge and zeolite powder are mixed uniformly in proportion, 100 mL of NaOH with the mass concentration being 2%-3% is added, the mixture is vibrated and modified for 12 h, then dried and taken out to be naturally aged for 2 h, bentonite serving as an adhesive is added for granulation, adsorbent particles are placed in the muffle furnace to be roasted at the temperature of 400 DEG C for 4 h, cooled, washed to be neutral with deionized water and dried at the temperature of 105 DEG C for 2 h, and the adsorbent is obtained. The adsorption material capable of adsorbing nitrogen and phosphorus simultaneously is prepared from the aluminum sludge containing activated carbon and zeolite, the adsorption effect of the aluminum sludge on ammonium and nitrogen in a water body is improved, and good phosphate adsorption performance is kept.

Description

technical field [0001] The invention relates to the field of adsorbent preparation, in particular to a method for preparing an adsorbent for simultaneous denitrification and phosphorus removal by using sludge from a waterworks. Background technique [0002] In order to control water eutrophication, the use of adsorbents to remove nitrogen and phosphorus in water is favored due to its advantages of low cost, high efficiency, and easy operation. In recent years, many studies have been carried out on low-cost adsorption materials with phosphorus absorption capacity, such as fly ash, steel slag, and zeolite. Water supply plant sludge (hereinafter referred to as aluminum sludge) is a by-product produced in the process of water supply treatment with aluminum salt or aluminum polymer as the main flocculant. Because it contains a large amount of amorphous aluminum, it has good phosphorus absorption capacity In foreign countries, research on phosphorus uptake by water plant sludge h...

AI Technical Summary

Problems solved by technology

This makes the waterworks sludge have a richer pore structure and a larger specific surface area, which is more conducive to the occurrence of adsorption reactions. The addition of activated carbon strengthens the adsorption performance of single aluminum sludge, and is effective for phosphorus and some heavy metal ions in water. It has a good adsorption and fixation effect, but the adsorption effect on ammonia nitrogen in water is not good

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