A method of treating sludge

Abstract

The invention provides a method for disposing sludge. The method comprises the following steps of: mixing sludge to be disposed with oxidants and an oxidation guide catalyst to carry out redox reaction; and mixing the redox reaction product with a flocculant to carry out coagulation to obtain a solid substance and filtrate, wherein the mass ratio of the oxidation guide catalyst to the dry basis of the sludge to be disposed is (3-8%):1; and the oxidation guide catalyst comprises 5-45wt% of metallic compounds and 55-95wt% of adsorbents. The method has the beneficial effects that when the sludge is disposed with the oxidation guide catalyst capsule adopted in the method provided by the invention, the initiation effect of the oxidation guide catalyst capsule can be exerted, without adding pH value regulators to the oxidation guide catalyst capsule, so that the oxidants can better decompose organic substances in the sludge in an oxidative manner; and therefore the sludge disposed by the method is neutral and the subduction amount of the sludge reaches the maximum, thus being beneficial to conduction of the subsequent process.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for treating sludge. Background technique [0002] Sludge is a product of sewage treatment, mainly from primary sedimentation tanks, secondary sedimentation tanks and other process links. The amount of sludge produced per 10,000 cubic meters of sewage after treatment (based on a moisture content of 80%) is generally about 5 to 10 tons. The sludge must be concentrated before dehydration and transport to reduce the moisture content of the sludge and reduce the volume of the sludge. volume. [0003] The basic principle of secondary biochemical treatment of sewage in sewage plants in the prior art is that microorganisms use organic matter in sewage as nutrients for their own metabolism, decompose them, and convert them into CO 2 、H 2 O and metabolic secretions, the residual secretions produced by microbial metabolism form excess sludge, and excess sludge,...

AI Technical Summary

Problems solved by technology

However, adding CaO to the sludge in this method increases the pH value of the sludge, and the change of the pH value directly affects the complexing equilibrium relationship of the metal, thereby affecting the oxidation ability of ozone. 3+ For example, in an alkaline environment, Fe 3+ It cannot catalyze ozone water with activated carbon to produce OH, but will generate precipitation under its own alkaline conditions, and the oxidation will lead to the loss of activity of the catalyst and the decline of catalytic ability, which is not conducive to the degradation of organic matter in sludge