Compound conditioning and deep dewatering method of sludge

Abstract

The invention provides a sludge deep dewatering method. The sludge deep dewatering method comprises the following steps: obtaining sludge containing a free radical generating substance; adding an activator to the sludge containing the free radical generating substance for activation, thereby obtaining the activated sludge; adding industrial byproduct gypsum to the activated sludge for mixing treatment, thereby forming conditioned sludge containing a new skeleton form substance; and performing dewatering treatment on the conditioned sludge. According to the sludge deep dewatering method, zero-valent iron or nano zero-valent iron is taken as the activator to react with the free radical generating substance to generate active free radicals, and therefore, the extracellular polymeric substance of the sludge can be effectively damaged and the filtering property of the sludge can be improved on one hand, and on the other hand, ions after the activation reaction is completed are capable of directly promoting the industrial byproduct gypsum to perform a hydration reaction, and the new substance morphology of the skeleton form can be controlled; the skeleton structure is capable of remarkably increasing the porosity of the sludge, and therefore, the deep dewatering of the sludge is realized.

Description

Technical field [0001] The invention belongs to the technical field of domestic sewage sludge treatment, in particular to a sludge compound conditioning and deep dehydration method. Background technique [0002] The so-called domestic sewage sludge (also referred to as municipal sludge) refers to the collective name of various types of sediments and floats produced by different treatment processes in urban domestic sewage treatment. The inherent characteristics of sludge cause sludge particles to have a higher solid content near the filter medium, and the particles form a network structure due to aggregation, which hinders the sedimentation and compression of sludge. Therefore, it is generally necessary to adopt chemical conditioning measures to improve the dewatering performance of sludge in order to carry out effective dewatering. [0003] Commonly used sludge chemical conditioning methods include: (1) adding flocculants or coagulants, and improving the settling performance of s...

AI Technical Summary

Problems solved by technology

[0010] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method based on free radical oxidation sludge composite conditioning and deep dehydration, the purpose of which is to use active free radical oxidation to destroy sludge flocs to change particle characteristics, and directly use Oxidation reaction by-products (Fe 2+ , Fe 3+ , SO 4 2- ) acts as a crystallization agent to promote the hydration reaction of industrial by-product gypsum to form dihydrate gypsum phase (CaSO 4 2H 2 O) The skeleton structure material is used to construct the dehydration filtration channel, thereby solving the technical problems such as the need to adjust the pH of the existing advanced oxidation conditioning sludge, or simply adding powder material as an inert skeleton substance, and the water content of the dewatered cake is limited.

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