Preparation method of adsorbent based on municipal sludge

Abstract

The invention discloses a preparation method of an adsorbent based on municipal sludge. The preparation method comprises the following steps: 1) with municipal sludge produced in a municipal sewage treatment process as a sludge raw material, adding calcium oxide, charcoal, fly ash and humic acid into the sludge raw material to form a mixture, and carrying out heating pretreatment; 2) adding N,N-dimethylformamide and Ce-Ni oxide into the pretreated material, conducting uniform stirring to form a mixture, heating the mixture to 120 + / - 5 DEG C in a nitrogen atmosphere, adding hexadecyl dimethyl benzyl ammonium chloride into the mixture after the temperature is within the temperature range, conducting continuous stirring at a constant temperature of 120 + / -5 DEG C after charging is completed, and then performing air-cooling to normal temperature to obtain a mixed material; and 3) adding magnesium oxide, zinc oxide and ferric oxide into the mixed material, uniformly stirring the mixed materials, carrying out heating, preserving heat, and conducting air-cooling to normal temperature after heat preservation to obtain the adsorbent. Compared with an adsorbent in the prior art, the adsorbent prepared by the method has more excellent adsorption activity, and nitrogen and phosphorus elements in sewage can be effectively removed.

Description

technical field [0001] The invention belongs to the technical field of pollution control, and in particular relates to a method for preparing an adsorbent based on municipal sludge. Background technique [0002] Municipal sludge is an organic fertilizer rich in organic matter, high in nitrogen, high in phosphorus and low in potassium. Its pH is neutral or slightly acidic. Its nutrient content is higher than that of ordinary livestock and poultry manure, and its mineralization rate is faster than that of farmyard manure. Using sludge to prepare adsorbent can be widely used in water treatment, flue gas desulfurization and denitrification, etc., realizing the harmony and unity of sludge treatment and resource utilization, and has good economic, environmental and social benefits. However, most of the widely used sludge-based adsorbents have low specific surface area, poor adsorption activity, and insufficient regeneration performance, so that the utilization rate of adsorbents i...

AI Technical Summary

Problems solved by technology

However, most of the sludge-based adsorbents widely used at present have low specific surface area, poor adsorption activity, and insufficient regeneration performance, so that the utilization rate of adsorbents in actual use needs to be further improved.