Dissolved gas and reagent integrated vacuum preloading method

Abstract

The invention provides a dissolved gas and reagent integrated vacuum preloading method. The method includes steps: step one, sampling engineering waste slurry on site; step two, determining chemical reagents, dissolved gas and the like according to analysis results acquired at the step one; step three, designing a waste slurry settling tank and the like; step four, feeding the waste slurry into the settling tank to a certain height through a pumping pipe; step five, sequentially feeding the chemical reagents and the like into the settling tank through the pumping pipe; step six, feeding the dissolved gas into the waste slurry through a gas adding device and a gas injection pipe; step seven, standing a waste slurry mixture with the chemical reagents; step eight, arranging transverse drainage pipes and vertical drainage pipes in a separation tank; step nine, using a pump for pumping precipitations into a solid-liquid separation tank with a vacuum network drainage system; step ten, step ten, starting vacuum loading after arrangement is finished; step eleven, stopping vacuum loading; step twelve, demounting the vacuum network drainage system after vacuum loading is finished. By the dissolved gas and reagent integrated vacuum preloading method, thorough solid-liquid separation can be realized.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering and environmental protection, and in particular relates to a dissolved gas-medicine vacuum preloading method. Background technique [0002] The research group has applied on June 13, 2015 for "a chemical vacuum preloading method for treating engineering waste mud (application number is 2015103224456)". For general engineering waste mud, etc., the treatment effect is very obvious. However, for engineering waste pulp with high organic content and high salt content, dredging sludge with high clay content, and ultra-high water content sludge containing a large number of anaerobic bacteria, proteins, and polysaccharides, there are still the following deficiencies: ( 1) In the middle and late stages of chemical pre-pressurization and vacuuming, due to the decrease of void ratio, the permeability coefficient also decreases, the pumping efficiency becomes slower and slower, and the treatm...

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Problems solved by technology

[0002] The research group has applied on June 13, 2015 for "a chemical vacuum preloading method for treating engineering waste mud (application number is 2015103224456)". For general engineering waste mud, etc., the treatment effect is very obvious. However, for engineering waste pulp with high organic content and high salt content, dredging sludge with high clay content, and ultra-high water content sludge containing a large number of anaerobic bacteria, proteins, and polysaccharides, there are still the following deficiencies: ( 1) In the middle and late stages of chemical pre-pressurization and vacuuming, due to the decrease of void ratio, the permeability coefficient also decreases, the pumping efficiency becomes slower and slower, and the treatment efficiency is not high; (2) For deeper in-situ filling For sludge or engineering waste slurry, the mixing equipment is huge and the mixing cost is high, which will affect its further promotion and application; (3) For sludge containing a large amount of anaerobic bacteria, adding oxygen will promote its decomposition and release more Adsorb water to achieve the purpose of dehydration and reduction, but the oxygen content in the sludge itself is very low, which cannot meet the needs of the complete decomposition of the bacteria in the sludge

For problem (2), the thicker the sludge and waste slurry to be treated, the greater the power required to invest in the equipment, and the greater the cost. Otherwise, there is no way to mix them all evenly, which will affect the post-processing effect. At present, there is no better solution. Solution

For question (3), according to the type of bacteria in the sludge flora, it is generally conditioned by adding inorganic chemicals such as iron salts, aluminum salts, and calcium salts to accelerate the decomposition of bacteria, and then use press filtration for deep dehydration. The efficiency of this method is relatively low

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