CN103121784A - Method for treatment and comprehensive utilization of sludge based on low-pressure catalytic thermal hydrolysis and application of method - Google Patents
Method for treatment and comprehensive utilization of sludge based on low-pressure catalytic thermal hydrolysis and application of method Download PDFInfo
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Abstract
The invention belongs to the technical field of sludge treatment, and discloses a method for treatment and comprehensive utilization of sludge based on low-pressure catalytic thermal hydrolysis and an application of the method. The method comprises the following steps of: injecting a catalyst and sludge with the water ratio of 75-90% into a reaction kettle, then injecting saturated steam with the pressure of 1.0-1.59MPa into the reaction kettle, stopping injecting the saturated steam when the temperature of the sludge reaches 60-80 DEG C, and maintaining the situation for 2 to 25 minutes, thus obtaining slurry after reaction; and performing anaerobic digestion reaction on the slurry to prepare a marsh gas. According to the method, the thermal hydrolysis time can be greatly shortened and the treatment efficiency can be improved by adding the catalyst, so that the energy consumption, the running cost, the equipment investment cost and the maintenance cost are reduced. The marsh gas prepared by the method can be used as a fuel for a steam boiler in a system or can be sold, and the purchased energy sources required by sludge treatment are reduced when the marsh gas is used as the fuel for the steam boiler in the system, so that the treatment cost is reduced, and the thorough harmlessness and recycling of the sludge are realized.
Description
Technical field
The invention belongs to technical field of sludge treatment, and relate to a kind for the treatment of process of mud.More specifically, the present invention relates to a kind of sludge treatment and method of comprehensive utilization and application thereof based on the hydrolysis of low pressure catalytic thermal.
Background technology
Dewatered sludge is the Main By product that produces in sewage treatment process, it not only contains abundant moisture, organism and microorganism, and contain the multiple objectionable impuritiess that cause environmental pollution such as heavy metal, so the improper processing of mud probably causes secondary environmental pollution.For avoiding the generation of the problems referred to above, develop successively at present some method for sludge treatment and device, with expectation, mud is dealt carefully with, realize minimizing, innoxious, even resource utilization.Wherein, the sludge disposal technology that comprises thermal hydrolysis processing, processed and remove the liquid reuse is a kind of effective method for sludge treatment.But existing method for sludge treatment mainly has the following disadvantages: (1) carries out long hydrolysis reaction usually under higher than the hot conditions of 190 ℃, steam consumption is large, energy consumption cost is high; (2) all adopt high-pressure saturated steam heating mud, owing to being hyperbaric environment for a long time in reactor in treating processes, this treatment process requires the higher high-tension apparatus of use cost, causes equipment cost to increase; (3) treatment time long, production efficiency is low, causes facility investment to increase.
Summary of the invention
The technical problem to be solved in the present invention is, energy consumption for method for sludge treatment of the prior art is large, length consuming time, processing efficiency is low and equipment cost is high defective, provides that a kind of energy consumption is little, short, processing efficiency is high and equipment cost the is low mud integrated conduct method based on the hydrolysis of low pressure catalytic thermal consuming time.
The technical problem to be solved in the present invention is achieved by the following technical programs: a kind of mud integrated conduct method based on the hydrolysis of low pressure catalytic thermal is provided, said method comprising the steps of:
S1, catalytic thermal hydrolysing step: be that 75～90% mud injects reactor with catalyzer and water ratio, with injecting the saturation steam of 1.0-1.59MPa in backward reactor, will be mixed with the mud heating of catalyzer, reaction obtains mud after finishing;
S2, anaerobic digestion producing methane step: described mud makes biogas through the anaerobic digestion reaction.
In above-mentioned mud integrated conduct method based on the hydrolysis of low pressure catalytic thermal, described method is further comprising the steps of: S3, mechanical dehydration step: the natural pond slag that produces through anaerobic digestion reaction in described step S2 is carried out mechanical dehydration, obtain water ratio and be 30～50% dehydrated sludge cake.Dehydrated sludge cake after mechanical dehydration can be used as organic fertilizer raw material, soil improvement, or as overburden soil, really realizes the minimizing of mud, innoxious and resource utilization.
In above-mentioned mud integrated conduct method based on low pressure catalytic thermal hydrolysis, described method is further comprising the steps of: S4, biogas recycling step: the biogas that makes in described step S2 is acted as a fuel to be returned to steam oven and prepares saturation steam.Biogas returns when using as the fuel of boiler, can save even all outsourcing energy costs of major part, realizes " with dirty pollution treatment ".In addition, the biogas that makes in this step also can be for sale.
In above-mentioned mud integrated conduct method based on low pressure catalytic thermal hydrolysis, the water ratio that injects mud in described step S1 in the reactor is 80～85%.
In above-mentioned mud integrated conduct method based on low pressure catalytic thermal hydrolysis, in described step S1, inject the saturation steam of 1.2～1.4Mpa in the reactor.
In above-mentioned mud integrated conduct method based on the hydrolysis of low pressure catalytic thermal, in described step S1, when the temperature of described mud reaches 60～180 ℃, stop injecting saturation steam and kept 0 ~ 25 minute.
In above-mentioned mud integrated conduct method based on the hydrolysis of low pressure catalytic thermal, in described step S1, when the temperature of described mud reaches 100～140 ℃, stop injecting saturation steam and kept 10～15 minutes.
In above-mentioned mud integrated conduct method based on the hydrolysis of low pressure catalytic thermal, in described step S1, the temperature of described mud is the temperature of cold zone in described reactor.
In above-mentioned mud integrated conduct method based on low pressure catalytic thermal hydrolysis, described catalyzer includes but not limited at least a in following compound: sodium hydroxide, calcium oxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, calcium hydroxide and magnesium hydroxide.
In above-mentioned mud integrated conduct method based on the hydrolysis of low pressure catalytic thermal, in described step S1, the mass ratio of described catalyzer and mud is 1: 10～1: 100.
In above-mentioned mud integrated conduct method based on low pressure catalytic thermal hydrolysis, whipping appts is equipped with in described reactor inside, and described step S1 also is included in to inject and starts described whipping appts before described saturation steam and stir mud.Preferably, described method stirred 0-5 minute before also being included in and injecting saturation steam in advance, made mud and catalyst mix even.Stirring operation can promote fully contacting of mud and saturation steam, makes that in treating processes, hot mass transfer is faster, thermal hydrolysis reaction mud is more complete.Explanation is in addition, although all start whipping appts before injecting saturation steam herein and in subsequent embodiment, this mode that is not limited to is controlled in the use of whipping appts.In other words, start whipping appts after also can or beginning to inject saturation steam in the process of injecting the process of mud, injecting catalyst.
In above-mentioned mud integrated conduct method based on the hydrolysis of low pressure catalytic thermal, further comprising the steps of between described step S 1 and S2:
S11: the steam discharge pressure release is also discharged described mud; And
S12: make the described mud of discharge cooling.
According to an aspect of the present invention, provide the above-mentioned application of mud integrated conduct method in processing organic solid castoff based on the hydrolysis of low pressure catalytic thermal.The organic solid castoff of this type includes but not limited to changing food waste, animal excrement and/or food-processing factory waste residue etc.
In the present invention, under the effect of heating power and pressure, the water holding of the solid matters such as the organic polymer structure in mud, gluey flco is destructurized, makes mud by the solid-state good liquid mud of mobility that is converted into of initial thickness.After adding catalyzer, the odor concentration of mud declines to a great extent, and the vent gas treatment load significantly reduces; The biodegradability that removes liquid significantly improves, and total nitrogen content declines to a great extent, and the carbon source that can be used as Sewage Plant is used; Simultaneously, thermal hydrolysis efficient improves, and temperature descends, time shorten, and old declines to a great extent.In addition, the high-temperature-hot-water solution is processed bacterium and the pathogenic agent that can thoroughly kill in mud, realizes the innoxious of mud.After thermal hydrolysis is processed, the contained microorganism of mud is disintegrated, and the organic matter of microorganism cells fully discharges the one-step hydrolysis of going forward side by side, the dissolving of solid organic matters and hydrolysis in mud, the anaerobic digestion performance of mud is greatly improved, for follow-up Anaerobic Digestion creates favorable conditions; Simultaneously, the water holding of mud is destructurized, being released in conjunction with water in mud, and dewatering is greatly improved, for follow-up processed creates favorable conditions.
In the present invention, compare the mode remove the liquid producing methane that adopts, can obtain more biogas take the liquid mud that obtains after thermal hydrolysis is processed during as substrate, and can be with the biogas that the produces fuel as steam boiler.Its water ratio of the resulting dehydrated sludge cake of mechanical dehydration is 30-50%, can be used as organic fertilizer raw material, soil improvement agent or overburden soil.Above treatment step helps to realize the recycling of mud.
Implement the present invention and can obtain following beneficial effect: (1) thermal hydrolysis treatment process of the present invention is applicable to the dewatered sludge of multiple water ratio, and need not before the thermal hydrolysis reaction, mud to be carried out any pre-treatment, and flow process is simple; (2) add catalyzer can make the sludge hot hydrolysis faster, more complete, in odor concentration decline, mud, total nitrogen content reduces, and is conducive to carrying out of subsequent disposal; (3) add catalyzer after, the present invention only need adopt the following saturation steam of 1.6MPa that mud is heated, the pressure of saturation steam significantly descends, therefore reduced the reactor that adopts and other requirement of pressure stage of auxiliary facility, can adopt the thermal hydrolysis reaction unit of low pressure structure as reactor, effectively reduce equipment cost, also reduced operator's qualification requirement and then controlled personnel cost simultaneously; (4) add catalyzer after, heat-up time and hold-time shorten, and have significantly improved processing efficiency, significantly reduce equipment investment cost and total operating cost; (5) integrated conduct method of the present invention can be widely used in other organic solid castoffs, has wide range of applications.
Description of drawings
Fig. 1 is the schema according to the mud integrated conduct method based on low pressure catalytic thermal hydrolysis of the present invention;
Fig. 2 is the schema based on the mud integrated conduct method of low pressure catalytic thermal hydrolysis according to the embodiment of the present invention 1;
Fig. 3 is the schema based on the mud integrated conduct method of low pressure catalytic thermal hydrolysis according to the embodiment of the present invention 2.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, the invention provides a kind of mud integrated conduct method based on the hydrolysis of low pressure catalytic thermal, the saturation steam of the method employing 1.0-1.59MPa and the mud that catalyzer is 75-90% to water ratio carry out thermal hydrolysis to be processed, and adopts thermal hydrolysis to process the mud producing methane that obtains.Above-mentioned treatment step has not only been realized sludge reduction and innoxious, and has realized the recycling to mud.
Above-mentioned treating in the process that lignin-sludge heats, the present invention contact by mud and saturation steam (can be described as heating source) direct and mud between heat exchange realize heating.Those skilled in the art are understood that, are used as at present the reactor of sludge hot hydrolysis treatment mainly from its top injection saturation steam, and the minority reactor injects saturation steam from its top and bottom simultaneously.Front mud is thick, heat exchanging process is slow because thermal hydrolysis is processed, and in reactor, the mud of different zones does not wait apart from the position of heating source, and in heat-processed, the mud temperature of the interior different positions of reactor is not identical.
When using integrated conduct method provided by the present invention, at first vertically get a little at inside reactor, by vertical third-class upper, middle, and lower part that is divided into, be namely top near 1/3 of top with reactor, be the bottom near 1/3 of bottom, 1/3 of centre is the middle part.When saturation steam injected from top, the bottom was cold zone; When injecting saturation steam simultaneously from the upper and lower, the middle part is cold zone.In other words, expression used herein " cold zone " means in reactor (the present invention is the thermal hydrolysis reaction unit) and therefore in heat-processed the zone at temperature relatively low mud place far away apart from heating source.
In a preferred embodiment of the invention, measure the temperature of mud in cold zone, and judge whether to need to continue to inject saturation steam take this temperature value as standard.The advantage of measuring the mud temperature at cold zone is: all the pending mud that can guarantee reactor all reach the essential temperature of carrying out the net heat hydrolysis treatment, help the abundant hydrolysis of mud in follow-up keep-process; Simultaneously, reduce steam injection and control temperature, shorten the treatment time, reduce energy consumption, raise the efficiency.
The present invention preferably uses the reactor of prone configuration and low pressure structure.The equipment cost of the reactor that the present invention is used is low, and all can adopt the low-pressure type device with other devices (such as boiler, feed valve, discharge valve and corresponding pipeline etc.) that the reactor of the type is used in conjunction with.On the other hand, compare the reactor that adopts vertical structure, the reactor heating surface area of prone configuration is larger, conduct heat more even, use during with the saturation steam of equipressure hot mass transfer speed faster and more even, thereby make whole pending mud be heated to the required time of certain treatment temp can to shorten dramatically.Following specific embodiment also all launches to describe in detail in conjunction with horizontal reacting still (in an embodiment referred to as reactor).But the present invention is not limited to use the reaction unit of this structure, the distortion of the reactor of any other structures of employing and be equal to replacement all within protection scope of the present invention.
Further describe the mud integrated conduct method based on the hydrolysis of low pressure catalytic thermal of the present invention below with reference to specific embodiment.
Embodiment 1:
As shown in Figure 2, the mud and the 50kg sodium carbonate that are 85-90% with 1 ton of water ratio inject reactor, off-response still opening for feed, and start the interior whipping appts of reactor; Injected the saturation steam of 1.0-1.1MPa from steam boiler by reactor top in it, the mud that is mixed with sodium carbonate in reactor is heated; The real time temperature of detection reaction still bottom mud when the mud temperature reaches 170 ℃, stops injecting saturation steam and kept 20-25 minute; Open subsequently pressure release valve and begin the steam discharge pressure release, open blow-off valve when the Pressure Drop in reactor is following to 0.05MPa, discharge thermal hydrolysis and process the mud that obtains; Mud is cooling produces biogas by the anaerobic digestion reaction; The natural pond slag that produces after Biogas enters pressure filter, obtains the dehydrated sludge cake that water ratio is 45-50% after mechanical dehydration.This moment, to complete water ratio be the comprehensive treating process of the mud of 85-90%, and the biogas of generation is well-known green energy resource, and the dehydrated sludge cake of gained can be used as organic fertilizer raw material, soil improvement agent or as overburden soil.
Embodiment 2:
As shown in Figure 3, the mud and the 15kg sodium hydroxide that are 80-85% with 1 ton of water ratio inject reactor, off-response still opening for feed, and start the interior whipping appts of reactor; At the uniform velocity stir sodium hydroxide and mud are mixed; Injected simultaneously the saturation steam of 1.1-1.2MPa in it by the reactor upper and lower from steam boiler, the mud that is mixed with sodium hydroxide in reactor is heated; The real time temperature of detection reaction still middle part mud when the mud temperature reaches 180 ℃, stops injecting saturation steam and kept 20-25 minute; Open subsequently pressure release valve and begin the steam discharge pressure release, open blow-off valve when the Pressure Drop in reactor is following to 0.05MPa, discharge thermal hydrolysis and process the mud that obtains; Mud is cooling produces biogas by anaerobic digestion reaction, and with the biogas that the obtains fuel as steam boiler, preparation steam is used for the thermal hydrolysis reaction; The natural pond slag that produces during producing methane enters pressure filter, obtains the dehydrated sludge cake that water ratio is 45-50% after mechanical dehydration.Complete water ratio this moment is the comprehensive treating process of the mud of 80-85%, and the biogas of generation is present known green energy resource, and the dehydrated sludge cake of gained can be used as organic fertilizer raw material, soil improvement agent or overburden soil.
Embodiment 3:
The mud and the 100kg potassium hydroxide that are 75-80% with 1 ton of water ratio inject reactor, off-response still opening for feed, and start the interior whipping appts of reactor; At the uniform velocity stir potassium hydroxide and mud are mixed; Injected the saturation steam of 1.2-1.3MPa from steam boiler by reactor top in it, the mud that is mixed with potassium hydroxide in reactor is heated; The real time temperature of detection reaction still bottom mud when the mud temperature reaches 140 ℃, stops injecting saturation steam and kept 15-20 minute; Open subsequently pressure release valve and begin the steam discharge pressure release, open blow-off valve when the Pressure Drop in reactor is following to 0.05MPa, discharge thermal hydrolysis and process the mud that obtains; Mud is cooling produces biogas by the anaerobic digestion reaction; The natural pond slag that produces during producing methane enters pressure filter, obtains the dehydrated sludge cake that water ratio is 40-45% after mechanical dehydration.Complete water ratio this moment is the comprehensive treating process of the mud of 75-80%, and the biogas of generation is present known green energy resource, and the dehydrated sludge cake of gained can be used as organic fertilizer raw material, soil improvement agent or overburden soil.
Embodiment 4:
The mud and 40kg calcium oxide, the 10kg sodium bicarbonate that are 83-88% with 1 ton of water ratio inject reactor, off-response still opening for feed, and start the interior whipping appts of reactor; At the uniform velocity stir calcium oxide and mud are mixed; Injected the saturation steam of 1.3-1.4MPa from steam boiler by reactor top in it, the mud that is mixed with calcium oxide in reactor is heated; The real time temperature of detection reaction still bottom mud when the mud temperature reaches 120 ℃, stops injecting saturation steam and kept 0 minute; Open subsequently pressure release valve and begin the steam discharge pressure release, open blow-off valve when the Pressure Drop in reactor is following to 0.05MPa, discharge the thermal hydrolysis processing and obtain mud; Mud is cooling produces biogas by anaerobic digestion reaction, and with the biogas that the obtains fuel as steam boiler, preparation steam is used for the thermal hydrolysis reaction; The natural pond slag that produces during producing methane enters pressure filter, obtains the dehydrated sludge cake that water ratio is 35-40% after mechanical dehydration.Complete water ratio this moment is the comprehensive treating process of the mud of 83-88%, and the biogas of generation is present known green energy resource, and the dehydrated sludge cake of gained can be used as organic fertilizer raw material, soil improvement agent or overburden soil.
Embodiment 5:
The mud and 30kg sodium carbonate, the 5kg calcium hydroxide that are 80-85% with 1 ton of water ratio inject reactor, off-response still opening for feed, and start the interior whipping appts of reactor; At the uniform velocity stir calcium hydroxide and mud are mixed; Injected the saturation steam of 1.4-1.5MPa from steam boiler by reactor top in it, the mud that is mixed with calcium hydroxide in reactor is heated; The real time temperature of detection reaction still bottom mud when the mud temperature reaches 100 ℃, stops injecting saturation steam and kept 5-10 minute; Open subsequently pressure release valve and begin the steam discharge pressure release, open blow-off valve when the Pressure Drop in reactor is following to 0.05MPa, discharge thermal hydrolysis and process the mud that obtains; Mud is cooling produces biogas by anaerobic digestion reaction, and with the biogas that the obtains fuel as steam boiler, preparation steam is used for the thermal hydrolysis reaction; The natural pond slag that produces during producing methane enters pressure filter, obtains the dehydrated sludge cake that water ratio is 35-40% after mechanical dehydration.Complete water ratio this moment is the comprehensive treating process of the mud of 80-85%, and the biogas of generation is present known green energy resource, and the dehydrated sludge cake of gained can be used as organic fertilizer raw material, soil improvement agent or overburden soil.
Embodiment 6:
With 20kg calcium hydroxide and 20kg magnesium hydroxide and 1 ton of mud injection reactor that water ratio is 80-85%, off-response still opening for feed, and start the interior whipping appts of reactor; Injected the saturation steam of 1.5-1.59MPa from steam boiler by reactor top in it, the mud that is mixed with calcium hydroxide and magnesium hydroxide in reactor is heated; The real time temperature of detection reaction still bottom mud when the mud temperature reaches 80 ℃, stops injecting saturation steam and kept 5-10 minute; Open subsequently pressure release valve and begin the steam discharge pressure release, open blow-off valve when the Pressure Drop in reactor is following to 0.05MPa, discharge thermal hydrolysis and process the mud that obtains; Mud is cooling produces biogas by anaerobic digestion reaction, and with the biogas that the obtains fuel as steam boiler, preparation steam is used for the thermal hydrolysis reaction; The natural pond slag that produces during producing methane enters pressure filter, obtains the dehydrated sludge cake that water ratio is 35-40% after mechanical dehydration.Complete water ratio this moment is the comprehensive treating process of the mud of 80-85%, and the biogas of generation is well-known green energy resource, and the dehydrated sludge cake of gained can be used as organic fertilizer raw material, soil improvement agent or overburden soil.
Embodiment 7:
1 ton of water ratio mud that is 85-90% and 10kg sodium bicarbonate are injected reactor, and off-response still opening for feed, and start whipping appts in reactor at the uniform velocity stirs sodium bicarbonate and mud is mixed; Injected simultaneously the saturation steam of 1.3-1.4MPa in it by the reactor upper and lower from steam boiler, the mud that is mixed with sodium bicarbonate in reactor is heated; The real time temperature of detection reaction still middle part mud when the mud temperature reaches 60 ℃, stops injecting saturation steam and kept 5-10 minute; Open subsequently pressure release valve and begin the steam discharge pressure release, open blow-off valve when the Pressure Drop in reactor is following to 0.05MPa, discharge thermal hydrolysis and process the mud that obtains; Mud is cooling produces biogas by anaerobic digestion reaction, and with the biogas that the obtains fuel as steam boiler, preparation steam is used for the thermal hydrolysis reaction; The natural pond slag that produces during producing methane enters pressure filter, obtains the dehydrated sludge cake that water ratio is 30-35% after mechanical dehydration.Complete water ratio this moment is the comprehensive treating process of the mud of 85-90%, and the biogas of generation is well-known green energy resource, and the dehydrated sludge cake of gained can be used as organic fertilizer raw material, soil improvement agent or overburden soil.
By above embodiment 1-7 as can be known, the mud integrated conduct method based on low pressure catalytic thermal hydrolysis of the present invention has wide range of applications applicable to the mud (dewatered sludge) of multiple water ratio; And need not to treat lignin-sludge and carry out any pre-treatment before processing, not only save the treatment time, and be conducive to cost control.Add catalyzer can make the sludge hot hydrolysis more complete, in odor concentration decline, mud, total nitrogen content reduces, and is conducive to carrying out of subsequent disposal.After adding catalyzer, the present invention only need adopt the following saturation steam of 1.6MPa that mud is heated, the pressure of saturation steam significantly descends, therefore reduced the reactor that adopts and other requirement of pressure stage of auxiliary facility, can adopt the thermal hydrolysis reaction unit of low pressure structure and/or normal pressure structure as reactor, effectively reduce equipment cost, also reduced operator's qualification requirement and then controlled personnel cost simultaneously.The temperature that stops injecting saturation steam is reduced to 60～180 ℃, can effectively shorten heat-up time, reduces energy consumption, and the hold-time that stops injecting after saturation steam shortens, and has significantly improved processing efficiency, makes total operating cost reduce.Like this, can process more mud under equal energy consumption and time conditions, effectively promote total processing efficiency.The dehydrated sludge cake that mud finally is converted into can be used as biomass fuel by method of the present invention and as the biogas of green energy resource has really been realized the comprehensive reutilization to mud.Because present technique is low than the conventional art energy consumption, the biogas that liquid mud is made through anaerobic digestion returns to use as the fuel of boiler, can save energy cost fully, realizes " with dirty pollution treatment ".Dehydrated sludge cake after mechanical dehydration can be used as organic fertilizer raw material, soil improvement or as overburden soil; Really realize the minimizing of mud, innoxious and resource utilization.
Mud integrated conduct method based on low pressure catalytic thermal hydrolysis of the present invention can be applicable to process organic solid castoff, the organic solid castoff of preferably treatment high-moisture percentage, more preferably can process the organic solid castoff that water ratio is 75-90%.The organic solid castoff of this type is such as but not limited to changing food waste, animal excrement and/or food-processing factory waste residue etc.Below will describe by concrete example the application of this treatment process in detail, but it should be understood that following concrete example only is used for explaining the present invention, and scope of the present invention not consisted of any restriction.
Example 1:
1 ton of food-processing factory waste residue and 15kg sodium hydroxide are successively injected reactor, off-response still opening for feed, and start the interior whipping appts of reactor; At the uniform velocity stir sodium hydroxide and food-processing factory waste residue are mixed; Injected the saturation steam of 1.1-1.2MPa from steam boiler by reactor top in it, the food-processing factory waste residue that is mixed with sodium hydroxide in reactor is heated; The real time temperature of detection reaction still bottom food-processing factory waste residue when the temperature of food-processing factory waste residue reaches 160 ℃, stops injecting saturation steam and kept 20 minutes; Open subsequently pressure release valve and begin the steam discharge pressure release, open blow-off valve when the Pressure Drop in reactor is following to 0.05MPa, discharge thermal hydrolysis and process the pasty food source mill waste residue that obtains; Soup compound is cooling produces biogas by the anaerobic digestion reaction; The natural pond slag that produces during producing methane enters pressure filter, obtains the dewatered product that water ratio is 45-50% after mechanical dehydration.Complete water ratio this moment is the comprehensive treating process of the food-processing factory waste residue of 85-90%.
Example 2:
The animal excrement and the 20kg potassium hydroxide that are 80-85% with 1 ton of water ratio inject reactor, off-response still opening for feed, and start the interior whipping appts of reactor; At the uniform velocity stir potassium hydroxide and animal excrement are mixed; Inject the saturation steam of 1.2-1.3MPa in it from steam boiler respond simultaneously still upper and lower, the animal excrement that are mixed with potassium hydroxide in reactor are heated; The real time temperature of detection reaction still middle part animal excrement when the temperature of animal excrement reaches 140 ℃, stops injecting saturation steam and kept 20 minutes; Open subsequently pressure release valve and begin the steam discharge pressure release, open blow-off valve when the Pressure Drop in reactor is following to 0.05MPa, discharge thermal hydrolysis and process the pulpous state animal excrement that obtain; Soup compound is cooling produces biogas by the anaerobic digestion reaction; The natural pond slag that produces during producing methane enters pressure filter, obtains the dewatered product that water ratio is 40-45% after mechanical dehydration.Complete water ratio this moment is the comprehensive treating process of the animal excrement of 80-85%.
Example 3:
The changing food waste that is 75-80% with 20kg calcium hydroxide and 20kg calcium oxide and 1 ton of water ratio successively injects reactor, off-response still opening for feed, and start whipping appts in reactor; Injected the saturation steam of 1.4-1.5MPa from steam boiler by reactor top in it, the changing food waste that is mixed with calcium hydroxide and calcium oxide in reactor is heated; The real time temperature of detection reaction still bottom changing food waste when the temperature of changing food waste reaches 80 ℃, stops injecting saturation steam and kept 5-10 minute; Open subsequently pressure release valve and begin the steam discharge pressure release, open blow-off valve when the Pressure Drop in reactor is following to 0.05MPa, discharge thermal hydrolysis and process the pulpous state changing food waste that obtains; Soup compound is cooling produces biogas by anaerobic digestion reaction, and with the biogas that the obtains fuel as steam boiler, preparation steam is used for the thermal hydrolysis reaction; The natural pond slag that produces during producing methane enters pressure filter, obtains the dewatered product that water ratio is 35-40% after mechanical dehydration.Complete water ratio this moment is the comprehensive treating process of the changing food waste of 75-80%.
The above is only the preferred embodiments of the present invention, not in order to limiting the present invention, all any modifications of doing in the spirit and principles in the present invention, is equal to and replaces or improvement etc., all should be included in protection scope of the present invention.
Claims (11)
1. the mud integrated conduct method based on the hydrolysis of low pressure catalytic thermal, is characterized in that, said method comprising the steps of:
S1, catalytic thermal hydrolysing step: be that 75 ~ 90% mud injects reactor with catalyzer and water ratio, with injecting the saturation steam of 1.0-1.59MPa in backward reactor, will be mixed with the mud heating of catalyzer, reaction obtains mud after finishing;
S2, anaerobic digestion producing methane step: described mud makes biogas through the anaerobic digestion reaction.
2. the mud integrated conduct method based on the hydrolysis of low pressure catalytic thermal according to claim 1, is characterized in that, described method is further comprising the steps of:
S3, mechanical dehydration step: the natural pond slag that produces through anaerobic digestion reaction in described step S2 is carried out mechanical dehydration, obtain water ratio and be 30 ~ 50% dehydrated sludge cake.
3. the mud integrated conduct method based on the hydrolysis of low pressure catalytic thermal according to claim 1 and 2, is characterized in that, described method is further comprising the steps of:
S4, biogas recycling step: the biogas that makes in described step S2 is acted as a fuel to be returned to steam boiler and prepares saturation steam.
4. the mud integrated conduct method based on low pressure catalytic thermal hydrolysis according to claim 1 and 2, is characterized in that, the water ratio that injects mud in described step S1 in the reactor is 80 ~ 85%.
5. the mud integrated conduct method based on low pressure catalytic thermal hydrolysis according to claim 1 and 2, is characterized in that, in described step S1, injects the saturation steam of 1.2 ~ 1.4Mpa in the reactor.
6. the mud integrated conduct method based on the hydrolysis of low pressure catalytic thermal according to claim 1 and 2, is characterized in that, in described step S1, when the temperature of described mud reaches 60 ~ 180 ℃, stops injecting saturation steam and kept 0 ~ 25 minute.
7. the mud integrated conduct method based on the hydrolysis of low pressure catalytic thermal according to claim 1 and 2, is characterized in that, in described step S1, when the temperature of described mud reaches 100 ~ 140 ℃, stops injecting saturation steam and kept 10 ~ 15 minutes.
8. the mud integrated conduct method based on the hydrolysis of low pressure catalytic thermal according to claim 1 and 2, is characterized in that, in described step S1, the mass ratio of described catalyzer and mud is 1:10 ~ 1:100.
9. the mud integrated conduct method based on low pressure catalytic thermal hydrolysis according to claim 1 and 2, it is characterized in that, whipping appts is equipped with in described reactor inside, and described step S1 starts described whipping appts stirring mud before also being included in and injecting described saturation steam.
10. the mud integrated conduct method based on the hydrolysis of low pressure catalytic thermal according to claim 1 and 2, is characterized in that, and is further comprising the steps of between described step S1 and S2:
S11: the steam discharge pressure release is also discharged described mud; And
S12: make the described mud of discharge cooling.
11. the application of mud integrated conduct method in processing organic solid castoff based on thermal hydrolysis of arbitrary claim in claim 1-10.
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Cited By (4)
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|---|---|---|---|---|
| CN104773938A (en) * | 2015-03-17 | 2015-07-15 | 清华大学 | Livestock and poultry manure anaerobic processing method |
| CN106698879A (en) * | 2016-12-12 | 2017-05-24 | 广州恒德环保科技有限公司 | Kitchen waste treatment method |
| CN108002671A (en) * | 2016-10-28 | 2018-05-08 | 中国石油化工股份有限公司 | A kind of processing method of biochemical sludge |
| CN113769321A (en) * | 2021-01-19 | 2021-12-10 | 上海大学 | Degradation method of micro plastic in organic solid waste |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104773938A (en) * | 2015-03-17 | 2015-07-15 | 清华大学 | Livestock and poultry manure anaerobic processing method |
| CN108002671A (en) * | 2016-10-28 | 2018-05-08 | 中国石油化工股份有限公司 | A kind of processing method of biochemical sludge |
| CN106698879A (en) * | 2016-12-12 | 2017-05-24 | 广州恒德环保科技有限公司 | Kitchen waste treatment method |
| CN113769321A (en) * | 2021-01-19 | 2021-12-10 | 上海大学 | Degradation method of micro plastic in organic solid waste |
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