CN102633414B - Method for treating sludge and extracting organic substances by using microwave - Google Patents

Method for treating sludge and extracting organic substances by using microwave Download PDF

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Publication number
CN102633414B
CN102633414B CN 201110444648 CN201110444648A CN102633414B CN 102633414 B CN102633414 B CN 102633414B CN 201110444648 CN201110444648 CN 201110444648 CN 201110444648 A CN201110444648 A CN 201110444648A CN 102633414 B CN102633414 B CN 102633414B
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China
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mud
solution
sludge
water
mixed
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CN 201110444648
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Chinese (zh)
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CN102633414A (en
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左健
薛咏海
刘成林
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天津市裕川环境科技有限公司
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Abstract

The invention provides a method for treating sludge and extracting organic substances by using microwave. The method comprises the following steps of: 1) adding an alkali solution into concentrated sludge from a secondary sedimentation tank of a sewage treatment plant in an adjusting tank, controlling the water content to be between 85 and 93 percent, controlling the pH value to be 8-11, and stirring and mixing for 10 to 30 minutes to obtain a sludge solution; 2) putting the sludge solution stirred and mixed in the 1) into a pressure container, and heating the sludge solution to the temperature of between 110 and 150 DEG C for 40 to 60 minutes by using a microwave generator of which the frequency is 915MHz to 2.45GHz to obtain a sludge mixed solution; and 3) cooling the sludge mixed solution in the 2) to the temperature of between 70 and 90 DEG C by flash evaporation, and separating solid and liquid. The method for extracting protein is quick, energy-saving and low in cost.

Description

A kind of microwave treatment mud that utilizes extracts organic method

Technical field

The present invention relates to a kind of sludge treatment technology, particularly a kind of microwave treatment mud that utilizes extracts organic method.

Background technology

The active sludge of sewage work is the by product of sewage disposal, its water content height, complicated component, not only contain nutritive elements such as great number of organic matters, N, P, K, also contain a large amount of pathogenic micro-organisms, and with stench, influenced by trade effluent, often also have more poisonous, objectionable impuritiess such as heavy metal, deal with improperly and very easily cause serious secondary pollution.Growing with each passing day of mud generation forms sharp-pointed contradiction with the wretched insufficiency of sludge treatment ability, the serious backwardness of processing means, and a large amount of wet mud is arbitrarily transported outward, simply landfill or stacking, causes many cities " mud besieged city ".The sludge treatment problem has become the urban environment problem that we can't avoid.

Data according to the announcement of national environmental protection portion: newly-increased municipal sewage treatment ability 1,149 ten thousand ton per days in the whole nation in 2008, and the newly-increased municipal sewage treatment ability in the whole nation in 2009 reaches 4,460 ten thousand ton per days.The surplus sludge volume of sludge treatment factory increases too year by year, it is estimated, 2010 national sludge discharged amount (water ratio is 75%-80%) can reach 1,400 ten thousand tons/year, and annual growth surpasses 10%.

Organic resource utilization in the mud is used, and the while finally reaches and makes sludge stabilizing, minimizing and innoxious purpose, is subjected to attention more and more widely.How properly disposing sewage plant sludge, and it is effectively utilized as a kind of new resource in addition, turn waste into wealth, become that municipal wastewater treatment plant and relevant departments improve technical level and the important factor of level of management, also is the common problem of paying close attention in the whole world.

Patent CN200610011413.5 and patent CN2272015.4 make the minimizing of mud with the organic pollutant of the ultrasonic degradation trade effluent of certain intensity; Patent 200410083828.4 promotes sludge dewatering with the ultrasonic wave of lower frequency; The biological activity of enhanced activity mud improves processing efficiency, improves effluent quality.Patent 201010134033.7, patent 200710051491.2, patent 200910273153.2, patent 02116227.1 etc. are with the utilization of microbial proteinous mixed solution and Biological resources in the chemical method high temperature extraction mud; Patent 200710064167.4 utilizes ultrasonication mud to produce the mud fertilizer.

But general chemical method needs thermal source, power consumption, complex process; Must strictly controlling of distance between two oscillators of ultrasonication mud existence and sludge concentration, large-scale industrial production is difficult to operation.About extracting organism mixed solution such as protein with microwave treatment mud and impelling the integrated technology patent documentation of the comprehensive minimizing of mud, recycling not see as yet and deliver.

Summary of the invention

At structural deficiency in the prior art, the purpose of this invention is to provide a kind of microwave treatment mud that utilizes and extract organic method, for the treatment of sewage treatment plant residual active sludge, but be beneficial to reach advanced treatment active sludge quick, easy, the low-carbon (LC) large-scale industrial production, make sludge of sewage treatment plant minimizing, resource utilization and comprehensive utilization, realize zero release.

For achieving the above object, the technical solution used in the present invention is:

A kind of microwave treatment mud that utilizes extracts organic method, and this method may further comprise the steps:

1) mud of the sewage work's second pond after will concentrating adds basic solution in regulating tank, and the control water ratio is between 85-93%, and the pH value mixed 10-30 minute at 8-11, got mud solution;

2) the mud solution after step 1) is mixed places pressurized vessel, utilizes frequency to be 110-150 ℃ for the microwave generator of 915MHz-2.45GHz is heated to temperature, and be 40-60 minute heat-up time, makes mud mixed liquid;

3) with step 2) mud mixed liquid that makes is by a flash distillation step, after its temperature is down to 70-90 ℃, by filter press solid-liquid is separated, separate the organism mixing solutions obtain the excess sludge residue that water ratio reduces and to contain microbial proteinous (described microbial proteinous is the protein that microorganism and hydrolysis of organic matter discharge in the mud).(wherein excess sludge residue water ratio is down to 45-55%, and the mass percent of microbial proteinous is 1-3% in the organism mixing solutions).

Preferably, described step 1) adds basic solution for the mud of the sewage work's second pond after will concentrating in regulating tank, and the control water ratio is between 85-93%, the pH value is at 8-11, mixed solution gross weight 0.2-1% lime behind the adding adjusting pH mixed 10-30 minute again, got mud solution.

Preferably, the basic solution in the described step 1) is NaOH solution or Ca (OH) 2In the solution one or both.

The present invention also provides a kind of integrated approach of comprehensive utilization of mud, comprises the steps:

1) mud of the sewage work's second pond after will concentrating adds basic solution in regulating tank, and the control water ratio is between 85-93%, and control pH value mixed 10-30 minute at 8-11, got mud solution;

2) the mud solution after step 1) is mixed places pressurized vessel, utilizes frequency to be 110-150 ℃ for the microwave generator of 915MHz-2.45GHz is heated to temperature, and be 40-60 minute heat-up time, makes mud mixed liquid;

3) with step 2) mud mixed liquid that makes is by a flash distillation step, after its temperature is down to 70-90 ℃, by filter press solid-liquid is separated, after the separation, excess sludge residue water ratio is down to 45-55%, and liquid portion is the organism mixing solutions of 1-3% for microbial proteinous content.

4) wash the excess sludge residue that step 3) obtains with water, utilize filter press to press dry the excess sludge residue after the washing, if there is not the pollution of hazardous and noxious substances such as heavy metal in the excess sludge residue after pressing dry, then further air-dry or oven dry back makes planting technique soil, flowers are supported and plant soil and soil improvement agent goods; If there is the pollution of hazardous and noxious substances such as heavy metal in the excess sludge residue after pressing dry, then further air-dry or oven dry back makes building materials article fixed-contamination materials such as grass planting brick, revetment brick.

5) the organism mixing solutions that step 3) is extracted microbial proteinous concentrate (can by the thin film evaporation thickening equipment) to microbial proteinous concentration be 15-30%, as the raw material of making foam concrete foamer or fire foam goods.

Preferably, above-mentioned integrated approach also comprises the steps: the water treatment system that enters sewage work with after the washing of the washing water of described step 4), to promote effective utilization of water.

More preferably, in the above-mentioned integrated approach, the washing water in the described step 4) are that sewage work handles back qualified discharge water.Qualified discharge water COD content after sewage work handles is less than 120mg/L, by the washing to the excess sludge residue, washing water COD content increases to more than the 3000mg/L, because organism further decomposes in the mud after microwave treatment, biodegradability improves, and the carbon-nitrogen ratio height, and is low at general sewage work carbon-nitrogen ratio, the characteristics that can't fully carry out a biological disposal upon improve sewage treating efficiency thereby the reuse of washing water can increase the biodegradable carbon source.

Preferably, in the above-mentioned integrated approach, described step 1) adds basic solution for the mud of the sewage work's second pond after will concentrating in regulating tank, the control water ratio is between 85-93%, the pH value is at 8-11, mixed solution gross weight 0.2-1% lime behind the adding adjusting pH mixed 10-30 minute again, got mud solution.

Preferably, in the above-mentioned integrated approach, the basic solution in the described step 1) is NaOH solution or Ca (OH) 2In the solution one or both.

After the mud of the sewage work's second pond after described concentrate referred to and concentrates through natural subsidence modes such as inclined plate sedimentations, through after filter press/physics press filtration separating treatment such as belt press filtration, water ratio reached the active sludge of 80-90%.

The integrated approach of comprehensive utilization of mud of the present invention is at water ratio 80-90%, and organic content is more than or equal to 40% (butt), and protein content is better greater than the active sludge effect of 30% (butt), more is conducive to comprehensive utilization.

The design philosophy that the present invention utilizes microwave treatment mud to extract organic method is based on the integrated technology that mud is carried out minimizing, resource utilization, high drying and other treatment, is the integrated technology of microwave treatment and chemical method, physics method; It is the collaborative integrated technology of multiple material in the chemical method; It is the integrated technology of mud process for extracting protein and comprehensive utilization of mud; It is the integrated technology of sludge reduction treatment process and water pollutant minimizing treatment process.

High drying technique among the present invention refers to: mud carries out microwave treatment in suitable chemical mediator, and after the integrated technology of the chemical action of microwave treatment and sodium hydroxide and lime extracted microbial proteinous, its sludge residue pressed dry back water ratio≤55%.

Minimizing technology among the present invention refers to: after microwave treatment is extracted microbial proteinous, even sludge reduction 40-50%; Residue after the extraction microbial proteinous mixed solution, handle back water washing up to standard with sewage work, washing water COD content increases to more than the 3000mg/L, because organism further decomposes in the mud after microwave treatment, biodegradability improves, and the carbon-nitrogen ratio height, low at general sewage work carbon-nitrogen ratio, the characteristics that can't fully carry out a biological disposal upon improve sewage treating efficiency thereby the reuse of washing water can increase the biodegradable carbon source, thereby improve sewage treating efficiency.

The product that utilizes microwave treatment mud to extract organic method gained is: organic mixture such as protein, and wherein: protein contains 40-60% approximately; Humic acids contains 15-30% approximately; Polysaccharide, nucleic acid and fat etc. contain about 8-15% approximately.

The beneficial effect that the present invention has:

(1) adopt the inventive method extraction albumen test quick, general chemical method reaction and disengaging time need more than 4 hours; And the inventive method is only about 1 hour;

(2) extraction albumen is energy-conservation, and general chemical method needs thermal source to heat; And the inventive method need not thermal source;

(3) extract the albumen low cost, general chemical method facility investment and operation are big; And this law only be its about 1/2nd;

(4) shortened the fermentation time of residue composting, the general sludge fermentation time needs about 30-60 days, and the residue fermentation time of the inventive method only is about 15-30 days.

(5) behind microwave or the ultrasonication mud, its water content≤55%; The mud of height mummification can directly be made various uses; Behind the microwave treatment mud, the washing water reuse improves compliance rate 〉=99% of sewage work water treatment efficiency, especially ammonia nitrogen.

Description of drawings

Fig. 1 utilizes the schema of microwave treatment active sludge for the present invention;

Fig. 2 is sludge decrementization of the present invention, high mummification resource utilization, zero-discharge technology schema.

Embodiment

Below in conjunction with drawings and the specific embodiments the present invention program is described further, but does not limit protection scope of the present invention.

Embodiment 1

As shown in Figure 1 and Figure 2: a kind of integrated approach of comprehensive utilization of mud (described mud is Tanggu, Tianjin sanitary sewage disposal factory mud, and the detection index of mud sees Table 1) comprises the steps:

(1) active sludge with sewage work carries out sedimentation, enters sludge thickener, gets 80% water content sludge behind filter press, and 80% water content sludge is joined in the regulating tank, adds the water of equivalent weight, and moisture percentage in sewage sludge is adjusted to 90%:;

(2) in the mud regulating tank, transfer to pH=10 with the sodium hydroxide solution of 40% (weight percent) after, add the lime of 90% water content sludge gross weight 0.6%; Mixed 30 minutes, and entered the 2.45GHz microwave reactor, power 15KW, reaction times 60min, then, flash distillation discharges it is cooled to 70-90 ℃, adopts filter press that solid-liquid is separated, and liquid portion is the microbial proteinous mixed solution; Solid part is the residue 1# behind the extraction albumen.The minimizing about 50% of mud this moment;

(3) water up to standard after extracting residue behind the albumen and handling with sewage work is with 1: 1 proportioning (V/V), washing, sedimentation, solid part is the residue 2# after washing, upper water solution C OD is up to more than the 3000mg/L, enter Sewage treatment systems, suitably " carburetting ", make COD≤60mg/L after the water treatment, ammonia nitrogen 5mg/L, P≤1mg/L.Make pollutants in sewage obtain further minimizing;

(4) washing back residue 2# because cell walls is broken, press dry, gets last sludge residue moisture≤55% with plate-and-frame filter press;

(5) sludge residue that obtains of step (4) different according to its heavy metal and PoPs content are made agricultural biological fertilizer, forestry, gardens with products such as bio-organic fertilizer, soil improvement agent or building materials.The mixed liquid of protein of extracting is used for making microbial products such as concrete foamer, fire foam, foliage fertilizer, biological pesticide.

The relevant sludge heavy-metal content table look-up of table 1

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (5)

1. the integrated approach of a comprehensive utilization of mud is characterized in that: comprise the steps:
1) mud of the sewage work's second pond after will concentrating adds basic solution in regulating tank, and the control water ratio is between 85-93%, and control pH value mixed 10-30 minute at 8-11, got mud solution;
2) the mud solution after step 1) is mixed places pressurized vessel, utilizes frequency to be 110-150 ℃ for the microwave generator of 915MHz-2.45GHz is heated to temperature, and be 40-60 minute heat-up time, makes mud mixed liquid;
3) with step 2) mud mixed liquid that makes is by a flash distillation step, after its temperature is down to 70-90 ℃, by filter press solid-liquid is separated, separate back excess sludge residue water ratio and be down to 45-55%, liquid portion is that microbial proteinous content (quality) is the organism mixing solutions of 1-3%;
4) wash the excess sludge residue that step 3) obtains with water, utilize filter press to press dry the excess sludge residue after the washing, if there is not the pollution of hazardous and noxious substances such as heavy metal in the excess sludge residue after pressing dry, then further air-dry or oven dry back makes planting technique soil, flowers are supported and plant soil and soil improvement agent goods; If there is the pollution of hazardous and noxious substances such as heavy metal in the excess sludge residue after pressing dry, then further air-dry or oven dry back makes grass planting brick, revetment brick building materials article fixed-contamination material;
5) to be concentrated into microbial proteinous concentration be 15-30% to the organism mixing solutions that step 3) is extracted microbial proteinous, as the raw material of making foam concrete foamer or fire foam goods.
2. the integrated approach of a kind of comprehensive utilization of mud according to claim 1, it is characterized in that: described integrated approach also comprises the steps: the water treatment system that enters sewage work with after the washing of the washing water of described step 4), to promote effective utilization of water.
3. the integrated approach of a kind of comprehensive utilization of mud according to claim 1 and 2 is characterized in that: the washing water in the described step 4) are that sewage work handles back qualified discharge water.
4. the integrated approach of a kind of comprehensive utilization of mud according to claim 1 and 2, it is characterized in that: described step 1) adds basic solution for the mud of the sewage work's second pond after will concentrating in regulating tank, the control water ratio is between 85-93%, the pH value is at 8-11, add to regulate mixed solution gross weight 0.2-1% lime behind the pH again, mixed 10-30 minute, and got mud solution.
5. the integrated approach of a kind of comprehensive utilization of mud according to claim 4, it is characterized in that: in the above-mentioned integrated approach, the basic solution in the described step 1) is NaOH solution or Ca(OH) 2In the solution one or both.
CN 201110444648 2011-12-27 2011-12-27 Method for treating sludge and extracting organic substances by using microwave CN102633414B (en)

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Families Citing this family (8)

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Publication number Priority date Publication date Assignee Title
CN102910879A (en) * 2012-10-18 2013-02-06 武汉达权节能板材有限公司 Method for producing fire-proof protein plate
CN103449848B (en) * 2013-08-28 2015-08-12 杨季冬 A kind of mud utilizing sewage disposal to produce produces the method for fertilizer
CN103896472B (en) * 2014-04-23 2016-01-20 江苏康泰环保股份有限公司 A kind of mud microwave cracking method of resource
CN105036218A (en) * 2015-09-09 2015-11-11 韩功篑 Environment-friendly sewage treatment agent and preparation method thereof
CN105331376B (en) * 2015-11-27 2017-10-10 华中农业大学 The high-valued processing unit of fresh biomass and method being carbonized based on microwave hydrothermal
CN105567242A (en) * 2016-02-22 2016-05-11 天津市裕川环境科技有限公司 Soil conditioner and application thereof
CN105950176A (en) * 2016-06-22 2016-09-21 太仓市新进农场专业合作社 Acidic soil conditioner
CN107892583A (en) * 2017-09-25 2018-04-10 福建省福永德环境科技有限公司 A kind of method that foamed ceramics is prepared using industrial and mineral, building, sewage sludge waste slag as raw material

Citations (1)

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Publication number Priority date Publication date Assignee Title
CN101524699A (en) * 2009-04-17 2009-09-09 清华大学 Method for improving anaerobic digestion performance of sludge by utilizing microwave alkaline thermal hydrolysis

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101524699A (en) * 2009-04-17 2009-09-09 清华大学 Method for improving anaerobic digestion performance of sludge by utilizing microwave alkaline thermal hydrolysis

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Inventor after: Zuo Jian

Inventor after: Xue Yonghai

Inventor after: Liu Chenglin

Inventor before: Zuo Jian

Inventor before: Xue Yonghai

Inventor before: Liu Chenglin

Inventor before: Wu Ruihua

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Free format text: CORRECT: INVENTOR; FROM: ZUO JIAN XUE YONGHAI LIU CHENGLIN WU RUIHUA TO: ZUO JIAN XUE YONGHAI LIU CHENGLIN

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Application publication date: 20120815

Assignee: Beijing Jingrui Kemai Water Technology Co., Ltd.

Assignor: Tianjin Yuchuan Environment Technology Co., Ltd.

Contract record no.: 2014990000935

Denomination of invention: Method for treating sludge and extracting organic substances by using microwave

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Address before: 300 457 days Tianda Science Park, Fourth Avenue, Binhai New Area Economic and Technological Development Zone, Tianjin, Block D2 101

Patentee before: Tianjin Yuchuan Environment Technology Co., Ltd.