CN107417059B - Method for improving organic waste dry weight reduction and dehydration performance - Google Patents
Method for improving organic waste dry weight reduction and dehydration performance Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
Abstract
The invention provides a method for improving the dry weight reduction and dehydration performance of organic wastes, which comprises the following steps of firstly, preparing an organic raw material into a pretreating agent for later use; then weighing organic waste, pouring the organic waste into a reactor, adding the pretreating agent into the reactor, and uniformly mixing and stirring; closing the reactor, and starting temperature rise pre-reaction; after heat preservation, opening an exhaust valve of the reactor, completely discharging gas generated by pre-reaction, closing the exhaust valve, opening an inflation valve, and filling reducing gas into the reactor to increase the internal pressure of the reactor; stopping inflating and closing the inflation valve; continuously heating to start a second reaction; and after the second reaction is finished, cooling to normal temperature, opening the reactor, and dehydrating the solid-liquid mixture after the reaction to obtain the mud cake. The invention comprehensively utilizes the catalytic air release function of the organic pretreatment agent, promotes the dissolution of organic waste, realizes the reduction catalytic reaction, obviously improves the dry weight reduction effect and the dehydration performance of the organic waste, and has low energy consumption.
Description
Technical Field
The invention belongs to the technical field of organic waste treatment, and particularly relates to a method for remarkably improving the dry weight reduction effect and the dehydration performance of organic waste by adding an efficient pretreating agent.
Background
The organic waste refers to waste sludge with high water content (40-99%) and organic matter content of more than 30% of inorganic component, such as kitchen waste, organic waste residue in spraying industry, organic high-boiling residual liquid, pharmaceutical synthetic waste residue, residual sludge generated in sewage treatment plants and the like. With the rapid development of socioeconomic, the production amount of industrial wastewater is increasing. According to statistics, in 2015, the total amount of wastewater discharged in China is 735.3 hundred million tons, wherein the total amount of industrial wastewater discharged accounts for about 27.1% of the total amount, mainly in areas such as Guangdong, Jiangsu, Shandong, Zhejiang and Henan (China agency of environmental protection division, China environmental statistics annual book [ M ]. Beijing: China statistical Press, 2016.). In the face of such a large amount of wastewater, more than 80% of wastewater treatment plants in China adopt a biological method as an important link in the wastewater treatment process (national research center for municipal water supply and drainage engineering, China municipal wastewater treatment site and planning [ J ] China environmental protection industry, 2003 (1): 32-35.), so that a large amount of waste sludge is generated, if the waste sludge is directly buried or incinerated, a large amount of waste of land resources and energy sources is caused, and the reduction of organic waste becomes an important problem of energy conservation and emission reduction in China.
At present, a plurality of organic waste reduction technologies exist, some technologies promote the dehydration of waste sludge to reduce the volume of the waste sludge, and the effect of reducing the dry weight of the organic waste is not really improved. For example, deep dehydration technology adopts a chemical conditioning method to improve the dehydration performance of waste sludge, only moisture is finally removed, and no decrement effect is generated on dry matters of organic waste (CN 103319066B); there are also techniques which can achieve the effect of dry weight reduction of organic wastes, but the effect is low and the cost is large. For example, anaerobic digestion technology has low digestion efficiency for treating waste sludge, high equipment cost and investment cost, poor dehydration effect of waste sludge, and safety risk of combustible gas generated by anaerobic digestion (chinese construction report. anaerobic digestion treatment of sludge still has many problems to be solved [ J ] water supply and drainage dynamics, 2011 (6): 46.). Like the thermal hydrolysis technology, the phenomenon of short steam flow is easy to occur in the process of treating organic waste, so that waste sludge in a thermal hydrolysis tank is heated unevenly, the thermal hydrolysis temperature rise time is longer, and the energy consumption is higher (CN 104891766B). In addition, the organic waste is treated by adopting the alkalization breaking and slurry acidification technologies, the dry weight reduction effect of the organic waste is not more than 20 percent, and the pretreatment time is longer, so that the waste sludge treatment efficiency is lower (CN 103964657B).
In conclusion, how to achieve the effect of reducing the dry weight of organic wastes and effectively improve the dewatering performance is a problem that the technicians in this field are trying to solve.
Disclosure of Invention
The invention aims to solve the technical problem of how to realize the effect of reducing the dry weight of organic wastes and effectively improving the dehydration performance.
In order to solve the technical problems, the technical scheme of the invention is to provide a method for improving the dry weight reduction and dehydration performance of organic wastes, which is characterized by comprising the following steps: the method comprises the following steps:
step 1: preparing an organic raw material into a pretreating agent for later use;
step 2: weighing organic waste, pouring the organic waste into a reactor, adding the pretreating agent prepared in the step 1 into the reactor, and uniformly mixing and stirring;
and step 3: after the mixture is uniformly stirred, closing the reactor and starting heating for pre-reaction; after heat preservation, opening an exhaust valve of the reactor, completely discharging gas generated by pre-reaction, closing the exhaust valve, opening an inflation valve, and filling reducing gas into the reactor to increase the internal pressure of the reactor; then stopping inflating and closing the inflation valve;
and 4, step 4: continuously heating to start a second reaction; and after the second reaction is finished, cooling to normal temperature, opening the reactor, and dehydrating the solid-liquid mixture after the reaction to obtain the mud cake.
Preferably, in the step 1, the organic raw material is one or more of oxalic acid, acetic acid, propionic acid, lactic acid and citric acid.
Preferably, in the step 1, the organic raw material is prepared into the pretreating agent according to the following mass percentages: 0.5 to 10 percent of oxalic acid, 1 to 15 percent of acetic acid, 15 to 50 percent of propionic acid, 15 to 40 percent of lactic acid, 10 to 55 percent of citric acid and water as a solvent.
Preferably, in the step 2, the organic waste has a water content of 40-99% and an organic matter content of more than 30% by mass of the inorganic component.
More preferably, the organic waste is residual sludge from a sewage treatment plant, kitchen waste, organic waste residue from a spraying industry, organic high-boiling residual liquid or pharmaceutical synthetic waste residue.
Preferably, in the step 2, the weight of the organic waste is 50-300 g; the dosage of the pretreating agent is 0.1-4g/g of dry organic waste.
Preferably, in the step 2, the stirring speed is 80-200r/min, and the stirring time is 5-30 min.
Preferably, in the step 3, the pre-reaction temperature is controlled to be 80-120 ℃, and the pre-reaction time is 10-180 min; filling reducing gas into the reactor to raise the pressure inside the reactor to 0.5-3.5 MPa.
Preferably, in the step 4, the temperature of the second reaction is controlled at 120-.
Preferably, in the step 4, the dehydration method comprises the following steps: and (4) carrying out suction filtration, filter pressing and centrifugal separation.
More preferably, in the step 4, the dehydration method specifically comprises: 1) and (3) suction filtration: the suction filtration negative pressure is-0.04 to-0.09 MPa, and the suction filtration time is 10-30 min; 2) and (3) filter pressing: the filter pressing pressure is 1-8MPa, and the filter pressing time is 1-10 min; 3) centrifugal separation: the centrifugation speed is 1000-.
The method provided by the invention comprehensively utilizes the catalytic air release function of the organic pretreatment agent, promotes the dissolution of the organic waste, realizes the reduction catalytic reaction, obviously improves the dry weight reduction effect and the dehydration performance of the organic waste, and has low energy consumption. Compared with the prior art, the method provided by the invention has the following beneficial effects:
(1) in the temperature-rising pre-reaction stage, the pre-treating agent obviously improves the catalytic air release function of the reactor and promotes the organic waste to be converted from a solid phase to a gas phase, thereby improving the dry weight reduction effect of the organic waste.
(2) And (3) introducing a proper amount of reducing gas into the reactor to increase the pressure in the reactor, continuously heating the reactor to increase the temperature, promoting the further decomposition of the organic waste, converting the organic waste from a solid phase to a liquid phase, and further improving the dry weight reduction effect and the dehydration performance of the organic waste.
(3) Compared with a blank experiment, the organic waste dry weight reduction effect of adding the pretreating agent can be improved from 15-28% to 30-55%.
(4) Compared with the blank experiment, the organic waste dehydration performance of the added pretreating agent is reduced, and the capillary water absorption time (CST) is reduced from 102.1-169.4 seconds to 32.7-52.3 seconds.
Drawings
FIG. 1 is a schematic view of an experimental apparatus for improving the dry weight loss and dehydration performance of organic wastes.
Detailed Description
The invention will be further illustrated with reference to the following specific examples.
Adopt the experimental apparatus who improves organic waste dry weight reduction and dehydration performance shown in figure 1 to carry out the experiment, the experimental apparatus who improves organic waste dry weight reduction and dehydration performance include reactor 1, reactor 1 bottom is equipped with heating power supply 2, reactor 1 top is equipped with agitator motor 3, thermometer 4 and manometer 5, gas charging line, exhaust pipe and safety line are connected to reactor 1 upper cover, are equipped with gas charging port valve 6, gas vent valve 7 and safety valve 8 on gas charging line, exhaust pipe and the safety line respectively.
The experiment of the following examples was carried out using this experimental apparatus.
Example 1
(1) Preparing 1000g of a pretreating agent: according to the mass percentage of 0.5 percent of oxalic acid, 15 percent of acetic acid, 10 percent of citric acid and 74.5 percent of water, 5g of oxalic acid, 150g of acetic acid, 100g of citric acid and 745g of water are respectively weighed, mixed together and stirred properly for standby.
(2) Then 300g of organic waste with the water content of 40 percent is weighed and poured into a high-pressure reactor, then 720g of pretreating agent with the addition amount of 4g/g of dry organic waste is added into the reactor, namely, 720g of pretreating agent is weighed and poured into the high-pressure reactor, and stirring is carried out for 30min at the rotating speed of 80r/min, so that the organic waste and the pretreating agent are fully and uniformly mixed.
(3) And after the materials are uniformly stirred, closing the reactor, preparing to switch on a power supply to start temperature rise for pre-reaction, and simultaneously ensuring that the materials are continuously stirred by a stirring motor at the rotating speed of 80r/min in the reaction process. When the temperature of the materials in the reactor rises to 100 ℃, counting down for 10min, sleeving a gas collection bag on a gas outlet of the reactor, opening a gas outlet valve of the reactor, collecting all gas generated by pre-reaction, and closing the gas outlet valve after collecting. Then, the valve of the gas charging port is opened, a proper amount of reducing gas such as argon is charged, the argon charging is stopped after the internal pressure of the reactor is increased to 1.5MPa, and then the valve of the gas charging port is closed.
(4) The temperature of the materials is continuously increased to 150 ℃, and the materials are kept at the temperature for reaction for 6 h. And after the reaction is finished, turning off a power supply, stopping heat preservation, cooling the reactor to the normal temperature (a thermometer shows the normal temperature and a pressure gauge shows the pressure of 0MPa), opening the reactor, carrying out pressure filtration on a solid-liquid mixture obtained after the reaction for 1min under the mechanical pressure of 8MPa to obtain a mud cake with low water content, drying and weighing.
(5) By comparing the dry weight mass of the organic waste before and after the reaction and the Capillary Suction Time (CST), it was found that the dry weight loss effect of the organic waste reached 55%, and the CST was decreased from 645.2 seconds to 32.7 seconds.
Example 2
(1) Firstly, 10g of pretreating agent is prepared: according to the mass percentage, 15 percent of propionic acid, 40 percent of lactic acid, 10 percent of oxalic acid, 11 percent of acetic acid and 24 percent of water are respectively weighed, namely 1.5g of propionic acid, 4g of lactic acid, 1g of oxalic acid, 1.1g of acetic acid and 2.4g of water are respectively mixed together and stirred evenly for standby.
(2) Then 200g of organic waste with the water content of 99 percent is weighed and poured into a high-pressure reactor, then 0.1g/g of pretreatment agent of dry organic waste is added into the reactor, namely 0.2g of pretreatment agent is weighed and poured into the high-pressure reactor, and the mixture is stirred for 5min at the rotating speed of 200r/min, so that the organic waste and the pretreatment agent are fully and uniformly mixed.
(3) And after the materials are uniformly stirred, closing the reactor, preparing to switch on a power supply to start temperature rise for pre-reaction, and simultaneously ensuring that the materials are continuously stirred by a stirring motor at the rotating speed of 200r/min in the reaction process. When the temperature of the materials in the reactor rises to 80 ℃, counting down for 120min, sleeving a gas collection bag on a gas outlet of the reactor, opening a gas outlet valve of the reactor, collecting all gas generated by the pre-reaction, and closing the gas outlet valve after the collection is finished. Then, the valve of the gas charging port is opened, a proper amount of reducing gas such as argon is charged, the argon charging is stopped after the internal pressure of the reactor is increased to 0.5MPa, and then the valve of the gas charging port is closed.
(4) The temperature of the materials is continuously increased to 120 ℃, and the materials are kept at the temperature for reaction for 8 hours. And after the reaction is finished, turning off the power supply, stopping heat preservation, cooling the reactor to the normal temperature (the thermometer shows the normal temperature, and the pressure gauge shows the pressure of 0MPa), opening the reactor, centrifugally dewatering the solid-liquid mixture obtained after the reaction for 30min at the rotating speed of 1000r/min, pouring out the supernatant to obtain a mud cake with low water content, drying and weighing.
(5) By comparing the dry weight mass of the organic waste before and after the reaction and the Capillary Suction Time (CST), it was found that the dry weight loss effect of the organic waste reached 30% and the CST was decreased from 134.3 seconds to 52.3 seconds.
Example 3
(1) Firstly, 10g of pretreating agent is prepared: weighing 1.5g of lactic acid, 5.5g of citric acid and 3g of water respectively according to the mass percentage of 15 percent of lactic acid, 55 percent of citric acid and 30 percent of water, mixing the lactic acid, the citric acid and the water together, and stirring the mixture properly for later use.
(2) Then 50g of organic waste with water content of 84% is weighed and poured into a high-pressure reactor, and then a pretreating agent with the dosage of 0.5g/g of dry organic waste is added into the reactor, namely 4g of pretreating agent is weighed and poured into the high-pressure reactor, and the stirring is carried out for 20min under the rotating speed of 150r/min, so that the organic waste and the pretreating agent are fully and uniformly mixed.
(3) And after the materials are uniformly stirred, closing the reactor, preparing to switch on a power supply to start temperature rise for pre-reaction, and simultaneously ensuring that the materials are continuously stirred by a stirring motor at the rotating speed of 150r/min in the reaction process. And when the temperature of the materials in the reactor rises to 110 ℃, counting down for 60min, sleeving a gas collection bag on a gas outlet of the reactor, opening a gas outlet valve of the reactor, collecting all gas generated by the pre-reaction, and closing the gas outlet valve after the collection is finished. Then, the valve of the gas charging port is opened, a proper amount of reducing gas such as argon is charged, the argon charging is stopped after the internal pressure of the reactor is increased to 1.5MPa, and then the valve of the gas charging port is closed.
(4) The temperature of the materials is continuously increased to 180 ℃, and the materials are kept at the temperature for reaction for 5 hours. And after the reaction is finished, closing the power supply, stopping heat preservation, cooling the reactor to the normal temperature (the thermometer shows the normal temperature, and the pressure gauge shows the pressure of 0MPa), opening the reactor, carrying out suction filtration and dehydration on the solid-liquid mixture obtained after the reaction for 30min under the pressure of-0.04 MPa to obtain a mud cake with low water content, drying and weighing.
(5) By comparing the dry weight mass of the organic waste before and after the reaction and the Capillary Suction Time (CST), it was found that the dry weight loss effect of the organic waste reached 42%, and the CST decreased from 465.4 seconds to 42.7 seconds.
Example 4
(1) Firstly, 500g of pretreating agent is prepared: according to the mass percentage, 50 percent of propionic acid, 10 percent of citric acid, 10 percent of oxalic acid and 30 percent of water are respectively weighed, 250g of propionic acid, 50g of citric acid, 50g of oxalic acid and 150g of water are mixed together and stirred properly for standby.
(2) Then 300g of organic waste with the water content of 70 percent is weighed and poured into a high-pressure reactor, then 180g of pretreating agent with the addition amount of 2g/g of dry organic waste is added into the reactor, namely 180g of pretreating agent is weighed and poured into the high-pressure reactor, and stirring is carried out for 25min under the rotating speed of 100r/min, so that the organic waste and the pretreating agent are fully and uniformly mixed.
(3) And after the materials are uniformly stirred, closing the reactor, preparing to switch on a power supply to start temperature rise for pre-reaction, and simultaneously ensuring that the materials are continuously stirred by a stirring motor at the rotating speed of 100r/min in the reaction process. When the temperature of the materials in the reactor rises to 100 ℃, counting down for 30min, sleeving a gas collection bag on a gas outlet of the reactor, opening a gas outlet valve of the reactor, collecting all gas generated by pre-reaction, and closing the gas outlet valve after collecting. Then, the valve of the gas charging port is opened, a proper amount of reducing gas such as argon is charged, the argon charging is stopped after the internal pressure of the reactor is increased to 1MPa, and then the valve of the gas charging port is closed.
(4) The temperature of the materials is continuously increased to 200 ℃, and the materials are kept at the temperature for reaction for 3 hours. And after the reaction is finished, turning off a power supply, stopping heat preservation, cooling the reactor to the normal temperature (a thermometer shows the normal temperature and a pressure gauge shows the pressure of 0MPa), opening the reactor, carrying out pressure filtration on a solid-liquid mixture obtained after the reaction for 10min under the mechanical pressure of 1MPa to obtain a mud cake with low water content, drying and weighing.
(5) By comparing the dry weight mass of the organic waste before and after the reaction and the Capillary Suction Time (CST), it was found that the dry weight loss effect of the organic waste reached 48%, and the CST decreased from 515.5 seconds to 39.3 seconds.
Example 5
(1) Preparing 50g of a pretreating agent: according to the mass percentage, 25 percent of citric acid, 10 percent of acetic acid, 10 percent of propionic acid and 55 percent of water are respectively weighed, namely 12.5g of citric acid, 5g of acetic acid, 5g of propionic acid and 27.5g of water are mixed together and stirred properly for standby.
(2) Then 50g of organic waste with water content of 84 percent is weighed and poured into a high-pressure reactor, then a pretreating agent with the adding amount of 1g/g of dry organic waste is added into the reactor, namely 8g of the pretreating agent is weighed and poured into the high-pressure reactor, and the stirring is carried out for 20min under the rotating speed of 180r/min, so that the organic waste and the pretreating agent are fully and uniformly mixed.
(3) And after the materials are uniformly stirred, closing the reactor, preparing to switch on a power supply to start temperature rise for pre-reaction, and simultaneously ensuring that the stirring motor continuously stirs the materials at the rotating speed of 180r/min in the reaction process. When the temperature of the materials in the reactor rises to 120 ℃, counting down for 30min, sleeving a gas collection bag on a gas outlet of the reactor, opening a gas outlet valve of the reactor, collecting all gas generated by the pre-reaction, and closing the gas outlet valve after the collection is finished. Then, the valve of the gas charging port is opened, a proper amount of reducing gas such as argon is charged, the argon charging is stopped after the internal pressure of the reactor is increased to 1MPa, and then the valve of the gas charging port is closed.
(4) The temperature of the materials is continuously increased to 220 ℃, and the materials are kept at the temperature for reaction for 3 hours. And after the reaction is finished, closing the power supply, stopping heat preservation, cooling the reactor to the normal temperature (the thermometer shows the normal temperature, and the pressure gauge shows the pressure of 0MPa), opening the reactor, carrying out suction filtration and dehydration on the solid-liquid mixture obtained after the reaction for 10min under the pressure of-0.09 MPa to obtain a mud cake with low water content, drying and weighing.
(5) By comparing the dry weight mass of the organic waste before and after the reaction and the Capillary Suction Time (CST), it was found that the dry weight loss effect of the organic waste reached 48%, and the CST was decreased from 465.4 seconds to 35.1 seconds.
Comparative example
In the present example, no pretreatment agent was added, which is a blank experiment for comparison with examples 1 to 5.
(1) Weighing 100g of organic waste with the water content of 84 percent, pouring the organic waste into a high-pressure reactor, closing the reactor, preparing to switch on a power supply to start temperature rise pre-reaction, simultaneously turning on a stirring motor, and setting the rotating speed to be 200r/min to ensure that the materials are uniformly heated in the reaction process. When the temperature of the materials in the reactor rises to 120 ℃, counting down for 180min, sleeving a gas collection bag on a gas outlet of the reactor, opening a gas outlet valve of the reactor, collecting all gas generated by the pre-reaction, and closing the gas outlet valve after the collection is finished. Then, the valve of the gas charging port is opened, a proper amount of reducing gas such as argon is charged, the argon charging is stopped after the internal pressure of the reactor is increased to 3.5MPa, and then the valve of the gas charging port is closed.
(2) The temperature of the material is continuously increased to 270 ℃, and the material is kept at the temperature for reaction for 0.5 h. And after the reaction is finished, turning off the power supply, stopping heat preservation, cooling the reactor to the normal temperature (the thermometer shows the normal temperature, and the pressure gauge shows the pressure of 0MPa), opening the reactor, centrifugally dewatering the solid-liquid mixture obtained after the reaction for 5min at the rotating speed of 8000r/min, pouring out the supernatant to obtain a mud cake with low water content, drying and weighing.
(3) By comparing the dry weight mass of the organic waste before and after the reaction and the Capillary Suction Time (CST), it was found that the dry weight loss effect of the organic waste reached 21%, and the CST was decreased from 465.4 seconds to 160.2 seconds.
Therefore, when the pretreatment agent is added, the dry weight reduction effect and the dehydration performance of the organic waste are greatly improved.
While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that the foregoing and other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.
Claims (6)
1. A method for improving the dry weight loss and the dehydration performance of organic wastes is characterized in that: the method comprises the following steps:
step 1: preparing an organic raw material into a pretreating agent for later use, wherein the organic raw material is one or more of oxalic acid, acetic acid, propionic acid, lactic acid and citric acid, and the pretreating agent is prepared according to the following mass percentages: 0.5 to 10 percent of oxalic acid, 1 to 15 percent of acetic acid, 15 to 50 percent of propionic acid, 15 to 40 percent of lactic acid, 10 to 55 percent of citric acid and water as a solvent;
step 2: weighing organic waste, pouring the organic waste into a reactor, adding the pretreating agent prepared in the step 1 into the reactor according to the proportion that the adding amount of the pretreating agent is 0.1-4g/g of dry organic waste, and uniformly mixing and stirring;
and step 3: after uniformly stirring, closing the reactor, and starting heating up for pre-reaction, wherein the pre-reaction temperature is controlled to be 80-120 ℃, and the pre-reaction time is 10-180 min; after heat preservation, opening an exhaust valve of the reactor, completely discharging gas generated by pre-reaction, closing the exhaust valve, opening an inflation valve, and filling reducing gas into the reactor to increase the internal pressure of the reactor to 0.5-3.5 MPa; then stopping inflating and closing the inflation valve;
and 4, step 4: continuing heating and heating, and starting a second reaction, wherein the temperature of the second reaction is controlled to be 120-270 ℃, and the time of the second reaction is controlled to be 0.5-8 h; and after the second reaction is finished, cooling to normal temperature, opening the reactor, and dehydrating the solid-liquid mixture after the reaction to obtain the mud cake.
2. The method of claim 1, wherein the method comprises the steps of: in the step 2, the organic waste has a water content of 40-99% and organic matter content of more than 30% by mass of inorganic components.
3. The method of claim 1, wherein the method comprises the steps of: in the step 2, the weight of the organic waste is 50-300 g.
4. The method of claim 1, wherein the method comprises the steps of: in the step 2, the stirring speed is 80-200r/min, and the stirring time is 5-30 min.
5. The method of claim 1, wherein the method comprises the steps of: in the step 4, the dehydration method comprises the following steps: and (4) carrying out suction filtration, filter pressing and centrifugal separation.
6. The method of claim 5, wherein the method comprises the steps of: in the step 4, the dehydration method specifically comprises the following steps: 1) and (3) suction filtration: the suction filtration negative pressure is-0.04 to-0.09 MPa, and the suction filtration time is 10-30 min; 2) and (3) filter pressing: the filter pressing pressure is 1-8MPa, and the filter pressing time is 1-10 min; 3) centrifugal separation: the centrifugation speed is 1000-.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103771679A (en) * | 2014-01-06 | 2014-05-07 | 浙江工业大学 | Synergetic treatment method of energy-saving dehydration and efficient heavy metal removal of sewage and sludge |
| CN104193136A (en) * | 2014-09-22 | 2014-12-10 | 河南工业大学 | Method for improving sludge dewatering performance through organic acid pretreatment |
| CN104628233A (en) * | 2014-12-30 | 2015-05-20 | 浙江海亮固废处理科技有限公司 | Deep dehydration device and deep dehydration method for organic materials |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103771679A (en) * | 2014-01-06 | 2014-05-07 | 浙江工业大学 | Synergetic treatment method of energy-saving dehydration and efficient heavy metal removal of sewage and sludge |
| CN104193136A (en) * | 2014-09-22 | 2014-12-10 | 河南工业大学 | Method for improving sludge dewatering performance through organic acid pretreatment |
| CN104628233A (en) * | 2014-12-30 | 2015-05-20 | 浙江海亮固废处理科技有限公司 | Deep dehydration device and deep dehydration method for organic materials |
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