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Method for preparing calcium magnesium carboxylate snow-melting agent by utilizing municipal sludge

A technology of municipal sludge and calcium carboxylate, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of no competitive advantage in product cost, limited source of wood vinegar, high market price, and achieve good industrial application prospects, Significantly economical, lower handling costs

Inactive Publication Date: 2011-10-12
广东慧信环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wood vinegar is a water-soluble organic compound obtained from biomass in pyrolysis engineering. Although the raw material price of calcium magnesium acetate produced by using wood vinegar is lower than that of petroleum, the source of wood vinegar is limited, and the market price remains the same. On the high side, the products produced by this method still have no competitive advantage in cost

Method used

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  • Method for preparing calcium magnesium carboxylate snow-melting agent by utilizing municipal sludge
  • Method for preparing calcium magnesium carboxylate snow-melting agent by utilizing municipal sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Put the sludge from the urban sewage treatment plant in the hydrothermal reactor, add hydrogen peroxide with a concentration of 30% (mass percentage), the amount of hydrogen peroxide added is 0.05-0.06g / L, and the pressure is 1.0-1.1 Under MPa, heat to 135-145°C, keep the temperature for hydrothermal reaction for 4 hours; after the reaction, let the mixture after hydrothermal oxidation reaction stand for 30 minutes, wait for solid-liquid separation, take the upper brown liquid, put it into a sealed container, and pass nitrogen 30min, add NaOH to the solution, adjust the pH value of the solution to 8-9, control the temperature at 35-38°C, and anaerobically ferment for 4 days under anaerobic conditions to obtain a brown organic acid solution after fermentation; Add tributyl phosphate organic extractant, the consumption of tributyl phosphate is 3%~4% (volume percentage) of the total amount of fermented liquid, stir evenly, leave standstill 40min, filter, obtain the light gr...

Embodiment 2

[0029] Put the sludge from the urban sewage treatment plant in the hydrothermal reactor, add hydrogen peroxide with a concentration of 30% (mass percentage), the amount of hydrogen peroxide added is 0.06-0.07g / L, and the pressure is 0.9-1.0 Under MPa, heat to 145-150°C, keep the temperature for hydrothermal reaction for 3.5h; Nitrogen for 30min, add Ca(OH) to the solution 2, adjust the pH value of the solution to 9-10, control the temperature at 30-35°C, and perform anaerobic fermentation under anaerobic conditions for 4 days to obtain a brown organic acid solution after fermentation; add trioctylphosphine into the brown fermentation liquid Organic extractant, the dosage of trioctylphosphine is 4%~5% (volume percentage) of the total amount of fermentation broth, stir evenly, let stand for 40min, filter, obtain the light gray solution after extraction; Good lime milk (the molar ratio of calcium and magnesium is controlled to be 3.5:6.5, and the molar ratio of calcium and magne...

Embodiment 3

[0031] Put the sludge from the urban sewage treatment plant in the hydrothermal reactor, add hydrogen peroxide with a concentration of 30% (mass percentage), the amount of hydrogen peroxide added is 0.04-0.05g / L, and the pressure is 1.1-1.2 Under MPa, heat to 130-135°C, keep the temperature for hydrothermal reaction for 3 hours; after the reaction, let the mixture after hydrothermal oxidation reaction stand for 60 minutes, wait for solid-liquid separation, take the upper brown liquid, put it into a sealed container, and pass nitrogen 40min, add NaOH to the solution, adjust the pH value of the solution to 10-11, control the temperature at 30-35°C, and anaerobically ferment for 3 days under anaerobic conditions to obtain a brown organic acid solution after fermentation; Add tributyl phosphate organic extracting agent in, the consumption of tributyl phosphate is 3%~4% (volume percentage) of the total amount of fermented liquid, stir evenly, leave standstill 30min, filter, obtain t...

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Abstract

The invention discloses a method for preparing a calcium magnesium carboxylate snow-melting agent by utilizing municipal sludge. The method comprises the following steps: the hydrothermal oxidation technology is adopted to perform hydrothermal separation on the organic matter and inorganic matter in the sludge of a municipal wastewater treatment plant and obtain organic mixed solution, then anaerobic fermentation is performed on the organic mixed solution, the anaerobic fermentation conditions are controlled to ensure that fermentation is performed in the acid-producing direction, then organic solvent is used to extract organic acid from the mixed solution, calcium magnesium compound is used to perform re-extraction, and the product is filtered and concentrated to prepare the calcium magnesium carboxylate snow-melting agent with higher purity. By adopting the method, the economical and efficient resource treatment can be performed on municipal sludge and the cheap and environmentally-friendly calcium magnesium carboxylate snow-melting agent can be prepared.

Description

technical field [0001] The invention relates to the technical field of sludge resource treatment and production of environment-friendly deicing agent, in particular to a method for preparing carboxylate calcium magnesium salt deicing agent from urban sludge. Background technique [0002] Sludge from urban sewage plants contains a large amount of organic matter (up to 60-80%), and is rich in nutrients such as N, P, and K. It is a potential resource with great utilization value. At present, the resource utilization approaches of organic matter in the sludge of urban sewage plants mainly include: 1. Utilize sludge to prepare organic fertilizers, as CN101333123 has announced the process technology of urban domestic sludge resource utilization, and urban sludge, mushroom slag and greening garbage are processed in an appropriate proportion. After blending, an appropriate amount of quicklime is added, and the aerobic-physical-chemical combined technology is used for fermentation, a...

Claims

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Application Information

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IPC IPC(8): C09K3/18
Inventor 谭铭卓蒋志飞区叶秀
Owner 广东慧信环保有限公司
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