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Method for improving dry weight reduction and dehydration performance of organic waste

A technology for organic waste and dehydration performance, applied in chemical instruments and methods, dehydration/drying/thickened sludge treatment, water/sludge/sewage treatment, etc., can solve the problem of high cost, uneven heating of waste sludge, no reduction In order to achieve the effect of low energy consumption, improve the effect of dry weight loss and dehydration performance, and promote the dissolution

Active Publication Date: 2017-12-01
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, deep dehydration technology uses chemical conditioning to improve the dehydration performance of waste sludge, and only water is finally released, which has no effect on the dry matter of organic waste (CN103319066B); there are also some technologies that can achieve the effect of reducing the dry weight of organic waste , but the effect is very low and the cost is large
For example, anaerobic digestion technology is generally not efficient in treating waste sludge, and the equipment cost and investment cost are high, the dehydration effect of waste sludge is poor, and the flammable gas produced by anaerobic digestion may also have safety risks ( China Construction News. There are still many problems to be solved urgently in the anaerobic digestion of sludge [J]. Water Supply and Drainage Dynamics, 2011(6): 46.)
Another example is the thermal hydrolysis technology, which is prone to short-flow of steam in the process of processing organic waste, resulting in uneven heating of waste sludge in the thermal hydrolysis tank, which makes the heating time of thermal hydrolysis longer and consumes more energy. (CN 104891766B)
In addition, the technology of alkalization cracking and mud acidification is used to treat organic waste. The dry weight reduction effect of organic waste is not more than 20%, and its pretreatment time is relatively long, which makes waste sludge treatment efficiency low (CN 103964657B)

Method used

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  • Method for improving dry weight reduction and dehydration performance of organic waste

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) First configure 1000g pretreatment agent: 0.5% oxalic acid, 15% acetic acid, 10% citric acid and 74.5% water by mass percentage, promptly weigh 5g oxalic acid, 150g acetic acid, 100g citric acid and 745g water respectively, and mix the four Together, stir properly, set aside.

[0032] (2) then take by weighing 300g of organic waste with a water content of 40% and pour it into a high-pressure reactor, then add a dosage of 4g / g pretreatment agent for dry organic waste in the reactor, namely take 720g of pretreatment agent Pour it into a high-pressure reactor and keep stirring at a speed of 80r / min for 30 minutes to fully mix the organic waste and the pretreatment agent evenly.

[0033] (3) After stirring evenly, close the reactor, prepare to turn on the power supply and start the pre-heating reaction, and at the same time ensure that the stirring motor continues to stir at a speed of 80r / min during the reaction process. When the temperature of the material in the rea...

Embodiment 2

[0037] (1) First configure 10g of pretreatment agent: 15% propionic acid, 40% lactic acid, 10% oxalic acid, 11% acetic acid and 24% water by mass percentage, that is, weigh 1.5g propionic acid, 4g lactic acid, 1g oxalic acid, 1.1 1 g of acetic acid and 2.4 g of water, the five are mixed together, stirred properly, and set aside.

[0038] (2) then take by weighing 200g of organic waste with a water content of 99% and pour it into a high-pressure reactor, then add a dosage of 0.1g / g pretreatment agent for dry organic waste in the reactor, namely take 0.2g pretreatment Pour the treatment agent into the high-pressure reactor and keep stirring at a speed of 200r / min for 5 minutes to fully mix the organic waste and the pretreatment agent evenly.

[0039](3) After stirring evenly, close the reactor, prepare to turn on the power supply and start the pre-heating reaction, and at the same time ensure that the material is continuously stirred at a speed of 200r / min during the reaction pr...

Embodiment 3

[0043] (1) First configure 10g pretreatment agent: 15% lactic acid, 55% citric acid and 30% water by mass percentage, that is, weigh 1.5g lactic acid, 5.5g citric acid, and 3g water respectively, and mix the three together. Stir well and set aside.

[0044] (2) then take by weighing 50g of organic waste with a water content of 84% and pour it into a high-pressure reactor, then add a dosage of 0.5g / g pretreatment agent for dry organic waste in the reactor, namely take 4g of pretreatment Pour the agent into the high-pressure reactor, and keep stirring at a speed of 150r / min for 20 minutes to fully mix the organic waste and the pretreatment agent evenly.

[0045] (3) After stirring evenly, close the reactor and prepare to turn on the power to start the pre-heating reaction, while ensuring that the stirring motor continues to stir at a speed of 150r / min during the reaction process. When the temperature of the material in the reactor rises to 110°C, start counting down for 60 minu...

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Abstract

The invention provides a method for improving dry weight reduction and dehydration performance of organic waste. The method comprises steps as follows: firstly, a pretreating agent is prepared from organic raw materials for later use; then, the organic waste is weighed and poured into a reactor, and the pretreating agent is added to the reactor, mixed and stirred uniformly; the reactor is closed, and heating is started for a pre-reaction; after thermal insulation is finished, an exhaust valve of the reactor is turned on, gas produced during the pre-reaction is completely exhausted, the exhaust valve is turned off, a gas charging valve is turned on again, reducing gas is charged into the reactor, and inside pressure of the reactor is increased; gas charging is stopped, and the gas charging valve is turned off; heating is continued, and a second reaction starts; after the second reaction ends, a product is cooled to the normal temperature, the reactor is opened, the reacted solid-liquid mixture is dehydrated, and a mud cake is obtained. The catalytic gas release function of the organic pre-treatment agent is comprehensively utilized, dissolution of the organic waste is promoted, reductive and catalytic reactions are realized, the dry weight reduction effect and the dehydration performance of the organic waste are notably improved, and energy consumption is low.

Description

technical field [0001] The invention belongs to the technical field of organic waste treatment, and in particular relates to a method for significantly improving the dry weight reduction effect and dehydration performance of organic waste by adding a high-efficiency pretreatment agent. Background technique [0002] Organic waste refers to waste sludge with high water content (40%-99%) organic matter accounting for more than 30% of inorganic components, such as kitchen waste, organic waste residue in the spraying industry, organic high-boiling residue, pharmaceutical synthetic waste residue and sewage treatment The remaining sludge produced by the factory, etc. With the rapid development of social economy, more and more industrial wastewater is produced. According to statistics, in 2015, the total amount of wastewater discharge in my country was as high as 73.53 billion tons, of which the total amount of industrial wastewater discharge accounted for about 27.1% of the total,...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/12C02F11/14
CPCC02F11/00C02F11/121C02F11/14
Inventor 李响甘雁飞薛罡陈红张文启叶婷婷游继光李君来思周
Owner DONGHUA UNIV
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