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Sludge deep-dehydration technology

A deep dehydration and process technology, applied in the field of environmental engineering, can solve the problems of poor flocculation effect, little flocculation conditioning, low dehydration rate, etc., achieve good flocculation effect, prevent Maillard phenomenon, and improve dehydration performance.

Active Publication Date: 2016-03-02
POWERCHINA ZHONGNAN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The flocculation conditioning dehydration in the prior art uses conventional flocculants such as iron salts, calcium salts, and polyacrylamide flocculants. The flocculation effect is not good. Combined with conventional mechanical dehydration, the dehydration rate is generally about 80%, and the dehydration rate is relatively low. Flocculation conditioning with less combination of hydrothermal reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Hydrothermal reaction: add surfactant free benzyltrimethylammonium chloride and sludge into the hydrothermal reaction kettle, the amount of free benzyltrimethylammonium chloride added is one ton of dry sludge 1.3%, close the reactor, start heating, set the temperature to 120°C, and the reaction pressure to 0.5MPa. After the temperature and pressure are stable, turn on the stirring device, the stirring speed is 200r / min, and the reaction time is 60min. natural cooling;

[0029] 2. Preparation of high-efficiency composite flocculant: Mix wood chips and ferric hydroxide at a ratio of 1:2, grind and sieve to make the particle size 100-200 microns, add water to prepare a 20% suspension;

[0030] 3. Flocculation conditioning: when the temperature of the reactor drops to 70°C, open the reactor, add a high-efficiency composite flocculant, the addition amount is 5% of one ton of dry sludge, close the reactor, turn on the stirring device, and the stirring speed is 150r / min, ...

Embodiment 2

[0033]1. Hydrothermal reaction: Add the surfactant dodecyldimethylbenzyl ammonium chloride and sludge into the hydrothermal reaction kettle, and the amount of dodecyldimethylbenzyl ammonium chloride added is 0.5% of one ton of dry sludge. Close the reactor, start heating, set the temperature to 160°C, and the reaction pressure to 1.2MPa. After the temperature and pressure are stable, turn on the stirring device, and the stirring speed is 200r / min. Be 30min, reaction finishes and adopts natural cooling to cool down;

[0034] 2. Preparation of high-efficiency composite flocculant: Mix straw and aluminum hydroxide at a ratio of 1:5, grind, and sieve to make the particle size 100-200 microns, add water to prepare a 30% suspension;

[0035] 3. Flocculation conditioning: when the temperature of the reactor drops to 60°C, open the reactor, add a high-efficiency composite flocculant, the addition amount is 1% of one ton of dry sludge, close the reactor, turn on the stirring device, an...

Embodiment 3

[0038] 1. Hydrothermal reaction: Add the surfactant dioctadecyldimethylammonium chloride and sludge into the hydrothermal reaction kettle, and the amount of dioctadecyldimethylammonium chloride added is one ton 1% of the dry sludge, the reactor is closed, and heating is started, the temperature is set to 140°C, and the reaction pressure is 1MPa. After the temperature and pressure are stabilized, the stirring device is turned on, the stirring speed is 200r / min, and the reaction time is 40min. Reaction finishes and adopts natural cooling to lower the temperature;

[0039] 2. Preparation of high-efficiency composite flocculant: Mix wood chips and aluminum hydroxide in a ratio of 1:2, grind and sieve to make the particle size 100-200 microns, and add water to prepare a 20% suspension;

[0040] 3. Flocculation conditioning: when the temperature of the reactor drops to 70°C, open the reactor, add a high-efficiency composite flocculant, the addition amount is 2% of one ton of dry slu...

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Abstract

The invention discloses a sludge deep-dehydration technology. The technology comprises hydro-thermal reaction, flocculation conditioning and mechanical dehydration. The hydro-thermal reaction process comprises adding 5-13kg of a surfactant into each ton of dry sludge, putting the surfactant and sludge into a hydro-thermal reactor and carrying out a sludge hydro-thermal reaction process at a temperature of 120-160 DEG C under relative pressure of 0.5-1.2 MPa. The sludge deep-dehydration technology has dehydrated sludge water content of 55% or less, greatly reduces sludge follow-up treatment difficulty and reduces a sludge follow-up treatment cost.

Description

technical field [0001] The invention relates to a technology for deep dewatering of sludge, which belongs to the field of environmental engineering. Background technique [0002] With the continuous improvement of my country's sewage treatment rate, the output of sludge is also on the rise. As a by-product of water treatment, sludge contains a large amount of refractory organic matter, heavy metals and salts, as well as pathogenic microorganisms and insect eggs. It will cause serious secondary pollution. [0003] Residual sludge, that is, the sludge produced after sewage treatment, is characterized by high water content, even as high as 99%. The most direct and effective way to achieve sludge reduction is to remove the water in the sludge, but due to The remaining sludge has complex components and is in the state of flocs, and its dewatering performance is extremely poor. If the untreated sludge is directly dewatered mechanically, the moisture content of the mud cake is still...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F11/14C02F11/10
CPCC02F11/10C02F11/12C02F11/121C02F11/123C02F11/14C02F2303/06
Inventor 张海静黎慧娟王展李勇杜成琼熊珊左莉娜郭沨
Owner POWERCHINA ZHONGNAN ENG
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