Method for lowering heavy metal content and water content in sludge

A heavy metal and water content technology, applied in water/sludge/sewage treatment, sludge treatment, sludge detoxification, etc., can solve the problems of high energy consumption and material consumption, complicated operation, etc., and achieve low energy consumption and material consumption, easy to gather Sinking, the effect of improving the dehydration performance

Inactive Publication Date: 2018-08-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous optimization of the dehydration process, the dewatering methods of sludge have changed towards diversification, and the dehydration effect has gradually improved. However, looking at the above-mentioned processes, there are disadvantages of complicated operation and high energy and material consumption.

Method used

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  • Method for lowering heavy metal content and water content in sludge
  • Method for lowering heavy metal content and water content in sludge
  • Method for lowering heavy metal content and water content in sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: the method for reducing heavy metal content and sludge water content in this sludge, concrete operations are as follows:

[0026] (1) Take 0.1g cetyltrimethylammonium chloride powder (relative molecular mass: 320), dissolve it in 62mL deionized water, stir at room temperature until completely dissolved, and put it in a brown reagent bottle for later use, ten of which The concentration of hexaalkyltrimethylammonium chloride solution is 5mmol / L;

[0027] (2) Add 200mL of cetyltrimethylammonium chloride solution with a concentration of 5mmol / L to 10g of phosphogypsum, vibrate and impregnate at 20°C for 3h, and filter the impregnated liquid-solid suspension, and the solid substance After drying and cooling, it is ground into powder, which is modified phosphogypsum, and stored in a desiccator for later use;

[0028] (3) Take an acetic acid solution with a mass concentration of 50%, add it to the sludge concentrated by gravity, and stir immediately at room temp...

Embodiment 2

[0035] Embodiment 2: the method for reducing heavy metal content and sludge moisture content in the sludge, the specific operations are as follows:

[0036] (1) Take 0.1g of cetyltrimethylammonium chloride powder, dissolve it in 31mL of deionized water, stir at room temperature until completely dissolved, and put it in a brown reagent bottle for later use, in which cetyltrimethylchloride The concentration of ammonium chloride solution is 10mmol / L;

[0037] (2) Add 500mL cetyltrimethylammonium chloride solution with a concentration of 10mmol / L to 10g of phosphogypsum, shake and impregnate at 25°C for 5h; after the impregnated liquid-solid suspension is filtered, the solid matter is dried After cooling, grind it into powder, which is modified phosphogypsum, and store it in a desiccator for later use;

[0038] (3) Take an acetic acid solution with a mass concentration of 100%, add it to the sludge concentrated by gravity, and stir immediately at room temperature at a stirring sp...

Embodiment 3

[0045] Embodiment 3: the method for reducing heavy metal content and sludge water content in this sludge, concrete operation is as follows:

[0046] (1) Take the ester quaternary ammonium salt, dissolve it in deionized water, stir at room temperature until it is completely dissolved, and put it in a brown reagent bottle for later use. The concentration of the ester quaternary ammonium salt solution is 1 mmol / L;

[0047] (2) Add a solution of ester quaternary ammonium salt with a concentration of 1 mmol / L to phosphogypsum, shake and impregnate at 25°C for 4 hours; after the impregnated liquid-solid suspension is filtered, the solid substance is dried and cooled, and ground into powder , which is modified phosphogypsum, stored in a desiccator for subsequent use, wherein the mass volume ratio of phosphogypsum and ester quaternary ammonium salt solution is 1g:6mL;

[0048] (3) Take an acetic acid solution with a mass concentration of 70%, add it to the sludge concentrated by gravi...

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Abstract

The invention discloses a method for lowering the heavy metal content and the water content in sludge. As for the method provided by the invention, by utilizing modified phosphogypsum and acetic acidto treat the sludge in a combination manner, the heavy metal environment risk and the water content in the sludge are lowered; with addition of the acetic acid and the modified phosphogypsum, the content of heavy metals in a sludge filtrate can be remarkably lowered, the content of heavy metal forms with relatively large risk in a sludge cake can also be obviously reduced, and the heavy metal environment risk is lowered; and meanwhile, as for the sludge subjected to treatment with the acetic acid and the modified phosphogypsum, the dewatering rate is remarkably increased, and the water contentin the sludge after dewatering is lowered to 45 percent or below. The method is simple and feasible in production technology operation and low in production cost, achieves the purpose of treating wastes with wastes by fully utilizing phosphogypsum as a waste resource to perform sludge treatment, improves the dewatering performance of the sludge while improving the heavy metal environment risk ofthe sludge, expands the field of phosphogypsum resource utilization, promotes comprehensive utilization of the phosphogypsum and is wide in application prospect and good in market prospect.

Description

technical field [0001] The invention belongs to the technical field of sludge reduction production technology, and at the same time belongs to the field of resource utilization of phosphogypsum, and specifically relates to a joint conditioning of modified phosphogypsum and acetic acid to reduce the environmental risk of heavy metals in sludge and the water content of sludge rate method. Background technique [0002] Phosphogypsum is a by-product of wet-process phosphoric acid production, and it has a large discharge in the chemical industry. For every 1 ton of phosphate fertilizer produced, an average of 3.75 tons of phosphogypsum is produced. At present, most of the phosphogypsum in China is disposed of in the open-air stacking method, which not only occupies a large amount of land resources, but also has a great impact on groundwater and the surrounding environment. Therefore, if phosphogypsum can be applied to related fields through a series of physical and chemical meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/12C02F11/14C02F101/20C02F101/22
CPCC02F11/00C02F11/004C02F11/12C02F11/122C02F11/14C02F2101/20C02F2101/203C02F2101/206C02F2101/22C02F2103/001C02F2303/04
Inventor 马丽萍戴取秀任南琪宁平瞿广飞郭致蓥
Owner KUNMING UNIV OF SCI & TECH
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