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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AI-Extracted 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 prob...

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.

Application Domain

Sludge treatment by de-watering/drying/thickening

Technology Topic

Thermal insulationPre treatment +9

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Examples

Experimental program(5)
Comparison scheme(1)

Example Embodiment

[0030] Example 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, namely weigh 5g oxalic acid, 150g acetic acid, 100g citric acid and 745g water respectively, and mix the four Together, stir properly and set aside.

[0032] (2) Then weigh 300g of organic waste with a moisture content of 40% and pour it into a high-pressure reactor, and then add a pretreatment agent of 4g/g dry organic waste into the reactor, that is, weigh 720g of pretreatment agent Pour 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.

[0033] (3) When the stirring is uniform, close the reactor and prepare to turn on the power to start the pre-reaction temperature rise, while ensuring that the material is continuously stirred at a speed of 80r/min during the reaction. When the temperature of the materials in the reactor rises to 100°C, the countdown starts for 10 minutes, and then a gas collecting bag is placed on the exhaust port of the reactor, and then the exhaust valve of the reactor is opened to collect all the gas generated by the pre-reaction. When the collection is complete, close the exhaust valve. Then open the gas inlet valve and fill it with an appropriate amount of reducing gas, such as argon, to increase the internal pressure of the reactor to 1.5 MPa, then stop the argon gas filling, and then close the gas inlet valve.

[0034] (4) Continue to heat the material to 150°C, and keep the material at this temperature for 6 hours. When the reaction is over, the power is turned off, the heat preservation is stopped, the reactor is cooled to normal temperature (the thermometer shows normal temperature, the pressure gauge shows 0MPa), the reactor is opened, and the solid-liquid mixture obtained after the reaction is pressed under a mechanical pressure of 8MPa. Filter for 1 min to obtain mud cake with low moisture content, dry and weigh.

[0035] (5) By comparing the dry weight mass and capillary water absorption time (CST) of the organic waste before and after the reaction, it is known that the dry weight reduction effect of the organic waste reaches 55%, and the CST decreases from 645.2 seconds to 32.7 seconds.

Example Embodiment

[0036] Example 2

[0037] (1) First configure 10g pretreatment agent: 15% propionic acid, 40% lactic acid, 10% oxalic acid, 11% acetic acid and 24% water according to mass percentage, namely weigh 1.5g propionic acid, 4g lactic acid, 1g oxalic acid, 1.1 g acetic acid and 2.4 g water, mix the five together, stir properly, and set aside.

[0038] (2) Then weigh 200g of organic waste with a water content of 99% and pour it into a high-pressure reactor, and then add a pretreatment agent of 0.1g/g dry organic waste into the reactor, that is, weigh 0.2g of pretreatment The treatment agent is poured into the high-pressure reactor and kept at a speed of 200r/min and stirred for 5 minutes to fully mix the organic waste and the pretreatment agent.

[0039] (3) When the stirring is uniform, close the reactor and prepare to turn on the power to start the pre-reaction temperature rise, while ensuring that the material is continuously stirred at the speed of 200r/min during the reaction. When the temperature of the materials in the reactor rises to 80°C, the countdown starts for 120 minutes, and then a gas collecting bag is placed on the exhaust port of the reactor, and then the exhaust valve of the reactor is opened to collect all the gas produced by the pre-reaction. When the collection is complete, close the exhaust valve. Then open the gas inlet valve and fill it with an appropriate amount of reducing gas, such as argon, to increase the internal pressure of the reactor to 0.5 MPa, then stop the argon gas filling, and then close the gas inlet valve.

[0040] (4) Continue to heat up the material to 120°C, and keep the material to react at this temperature for 8 hours. When the reaction is over, turn off the power, stop the heat preservation, cool the reactor to normal temperature (the thermometer shows normal temperature, the pressure gauge shows 0MPa), open the reactor, and centrifuge the solid-liquid mixture obtained after the reaction at 1000r/min. Dehydrate for 30 minutes, then discard the supernatant to obtain a mud cake with low moisture content, dry, and weigh.

[0041] (5) By comparing the dry weight mass and capillary water absorption time (CST) of the organic waste before and after the reaction, it is known that the dry weight reduction effect of the organic waste reaches 30%, and the CST decreases from 134.3 seconds to 52.3 seconds.

Example Embodiment

[0042] Example 3

[0043] (1) First configure 10g pretreatment agent: 15% lactic acid, 55% citric acid and 30% water according to 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 weigh 50g of organic waste with a moisture content of 84% and pour it into the high-pressure reactor, and then add a pretreatment agent of 0.5g/g dry organic waste into the reactor, that is, weigh 4g for 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.

[0045] (3) When the stirring is uniform, close the reactor and prepare to switch on the power to start the pre-reaction temperature rise, while ensuring that the material is continuously stirred at the speed of 150r/min during the reaction. When the temperature of the materials in the reactor rises to 110°C, the countdown starts for 60 minutes, and then a gas collecting bag is placed on the exhaust port of the reactor, and then the exhaust valve of the reactor is opened to collect all the gas generated by the pre-reaction. When the collection is complete, close the exhaust valve. Then open the gas inlet valve and fill it with an appropriate amount of reducing gas, such as argon, to increase the internal pressure of the reactor to 1.5 MPa, then stop the argon gas filling, and then close the gas inlet valve.

[0046] (4) Continue to heat the material to 180°C, and keep the material to react at this temperature for 5 hours. When the reaction is over, turn off the power, stop the heat preservation, cool the reactor to normal temperature (the thermometer shows normal temperature, the pressure gauge shows 0MPa), open the reactor, and put the solid-liquid mixture obtained after the reaction at a negative pressure of -0.04MPa Suction filtration and dehydration under pressure for 30 minutes to obtain a mud cake with low moisture content, drying and weighing.

[0047] (5) By comparing the dry weight mass and capillary water absorption time (CST) of the organic waste before and after the reaction, it is known that the dry weight reduction effect of the organic waste reaches 42%, and the CST is reduced from 465.4 seconds to 42.7 seconds.

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Classification and recommendation of technical efficacy words

Promote dissolution

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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