Method for improving sludge dehydrating effect

A sludge dehydration and sludge technology, applied in water/sludge/sewage treatment, chemical instruments and methods, dehydration/drying/thickened sludge treatment, etc., can solve the problems of complex operation, high material consumption and high energy consumption , to achieve the effect of broad application prospects, low energy consumption, and resource saving

Inactive Publication Date: 2017-09-26
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 such as complicated operation, high energy consumption, and high material consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: improve the method for sludge dewatering effect, concrete operations are as follows:

[0019] (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;

[0020] (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 impregnated phosphogypsum, and stored in a desiccator for later use;

[0021] (3) Add 1g of impregnated phosphogypsum finished product to 100g of gravity-concentrated municipal sludge, stir and react at 20°C for 10min at a stirring speed of 500r / min, after ...

Embodiment 2

[0022] Embodiment 2: improve the method for sludge dewatering effect, concrete operations are as follows:

[0023] (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;

[0024] (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, it is ground into powder, which is impregnated phosphogypsum, and stored in a desiccator for later use;

[0025] (3) Add 1g of impregnated phosphogypsum finished product to 500g of gravity-concentrated municipal sludge, stir and react at 25°C for 20min, and settling at a stirring speed of 800r / min, then filter, and simu...

Embodiment 3

[0026] Embodiment 3: improve the method for sludge dewatering effect, concrete operations are as follows:

[0027] (1) Take 0.1g of cetyltrimethylammonium chloride powder, dissolve it in 21mL 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 15mmol / L;

[0028] (2) Add 300mL of cetyltrimethylammonium chloride solution with a concentration of 15mmol / L to 10g of phosphogypsum, shake and impregnate at 30°C for 6h; after the impregnated liquid-solid suspension is filtered, the solid matter After drying and cooling, it is ground into powder, which is impregnated phosphogypsum, and stored in a desiccator for later use;

[0029] (3) Add 2g of impregnated phosphogypsum to 1800g of municipal sludge, stir and react at 30°C for 25min at a stirring speed of 1000r / min, after settling, filter, and measure the sludge specific resistance...

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Abstract

The invention discloses a method for improving sludge dehydrating effect. The method comprises the following steps: soaking and modifying phosphorus gypsum by using hexadecyl trimethyl ammonium chloride; filtering the soaked material, and drying and grinding to obtain the soaked phosphorus gypsum; adding the soaked phosphorus gypsum into sludge; filtering after the sludge is stirred and precipitated to obtain the sludge with low water content; the water content of the sludge which is treated by a finished soaked phosphorus gypsum product is lower than 50 percent; the sludge specific resistance of the sludge is also remarkably reduced; the filtering performance of the sludge is improved; the production process disclosed by the invention is simple and feasible, and is low in production cost; waste is treated by waste, and the waste is changed into treasure; the energy consumption is low; the sludge dehydrating effect is improved, and further, theoretical basis is provided for resource utilization of the phosphorous gypsum; the application fields of the phosphorous gypsum are expanded; a large number of resources are saved; the application prospect is board; the market prospect is good; environment pollution is avoided.

Description

technical field [0001] The invention belongs to the resource application field of phosphogypsum, and also belongs to the technical field of sludge reduction production technology, and specifically relates to a method for improving sludge dewatering effect by using phosphogypsum. Background technique [0002] Phosphogypsum is a by-product of wet-process phosphoric acid production, and it is one of the solid wastes with the largest discharge in the chemical industry. For every ton of phosphate fertilizer produced, an average of 3.75 tons of phosphogypsum is produced. Most of the phosphogypsum is disposed of by stacking in the open air or pouring into the sea, and phosphogypsum contains a lot of harmful substances, which not only occupies a lot of land resources, but also pollutes our living environment. This restricts the resource utilization of phosphogypsum to a large extent, and continues to affect the environment on which human beings live. Therefore, if phosphogypsum can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
CPCC02F11/14C02F2303/06
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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