Method for deeply dehydrating sludge through gravity concentration and photodecomposition

Abstract

The invention relates to a method for deeply dehydrating sludge through gravity concentration and photodecomposition. The method comprises the steps that a macromolecular composite flocculant is added into the sludge with the water content of 98% or above according to the proportion of 1.3%o-1.7%o of the sludge solid content Tds, and the sludge is concentrated through gravity till the water content ranges from 95% to 97%; the sludge subjected to gravity concentration is aerated; Fe2+ salt is added into the aerated sludge according to the proportion of 1.1%o-1.3%o of the sludge solid content Tds, and the sludge is irradiated with ultraviolet light with the wavelength being 253.7 nm; FeSO4.7H2O is added in a stirred mode according to the proportion of 6.5%-8.5% of the sludge solid content Tds. According to the method for deeply dehydrating the sludge through gravity concentration and photodecomposition, the equipment investment cost is low, the agent addition amount is reduced, energy consumption is reduced, environment-friendly clean energy is utilized, and the water content of a sludge cake is reduced.

Description

Technical field [0001] The invention relates to a method for deeply dewatering sludge by using gravity concentration and photolysis. Background technique [0002] With the development of social economy, the acceleration of urbanization, the improvement of people's living standards, the popularization of municipal sewage facilities, the increase of sewage treatment rate, the deepening of the treatment degree, the rapid growth of sludge treatment and disposal, how to deal with it reasonably Good sludge has become the primary problem that local governments and governments at all levels need to solve together. [0003] The sludge contains toxic and harmful substances such as organic matter, heavy metals, pathogenic bacteria and pathogenic bacteria. If it is not properly treated, it will cause a second pollution to the environment, causing disasters such as decomposition of organic matter, release and transfer of heavy metals, and migration of pathogenic bacteria. The state has formula...

AI Technical Summary

Problems solved by technology

[0005] Sludge treatment and disposal methods With the actual needs of history and times, sludge deep dehydration technology represented by "sludge concentration-iron salt plus lime" has been produced, but the purpose is to reduce the moisture content of sludge at the expense of It is not advisable to add a large amount of sludge advanced treatment additives produced under the influence of low-end energy and the environment in exchange for a stable and harmless sludge technology route