CN104291549A - Method for enhancing sludge dewatering by combining microwaves, acids and quick lime - Google Patents
Method for enhancing sludge dewatering by combining microwaves, acids and quick lime Download PDFInfo
- Publication number
- CN104291549A CN104291549A CN201410510096.6A CN201410510096A CN104291549A CN 104291549 A CN104291549 A CN 104291549A CN 201410510096 A CN201410510096 A CN 201410510096A CN 104291549 A CN104291549 A CN 104291549A
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- China
- Prior art keywords
- sludge
- mud
- dehydration
- microwave
- unslaked lime
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Classifications
-
- 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
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/04—Surfactants, used as part of a formulation or alone
Abstract
The invention relates to a method for enhancing sludge dewatering by combining microwaves, acids and quick lime. The method comprises the following steps: 1) adding an acidic solution into sludge and adjusting the pH value of the sludge to 2.5-3.0; 2) adding quick lime and uniformly stirring and mixing; 3) heating to 90-100 DEG C by using microwaves to obtain pre-treated sludge; and 4) mechanically dehydrating the pre-treated sludge. The dewatering performance of the pre-treated sludge is remarkably improved, the content of bound water, viscosity and surface electronegativity of the sludge are reduced, and the grain size of the sludge particles is increased. Meanwhile, by adding the quick lime, the pH value of the treated sludge ranges from 6.0 to 7.0, so that deep dewatering of the sludge by subsequent mechanical equipment is achieved.
Description
Technical field
The present invention relates to a kind of microwave-acid-unslaked lime combination process of sewage treatment plant residual mud strengthen dewatering.By microwave heating, and add a certain amount of acid solution and unslaked lime, improve dewatering performance of sludge, belong to solid waste disposal technical field.
Background technology
Activated sludge process is technique the most frequently used in sanitary sewage, municipal effluent and organic industrial sewage process.Mud is that along with the lifting of sewage work's sewage treating efficiency, sludge yield also increases sharply year by year with the Main By product in active sludge biological treating processes.Dispose for ease of mud transport and subsequent disposal, mechanical sludge dewatering is the Main Means reducing moisture percentage in sewage sludge.Usually, sludge of sewage treatment plant is after flocculation conditioning, utilize the dehydration equipments such as belt filter press, plate-and-frame filter press and whizzer, moisture percentage in sewage sludge can be reduced to 80%, but reduce moisture percentage in sewage sludge further to less than 60%, more difficult realization at present, high water content sludge not only adds the transportation cost of mud, and the mud of more than 60% water ratio also cannot meet the handle demand such as follow-up Sludge landfill, compost and burning simultaneously.
Mud is difficult to dewater and has close ties with the distribution characteristics of water in mud and compressibility.The existing forms of the water in mud mainly contains free water, interstitial water, planar water and internal junction Heshui, planar water, Bound moisture and portion gap water are referred to as irreducible water, some scholars is still liquid part water (unfrozen water) under being defined as specified temp (usually-20 DEG C), and irreducible water is difficult to be removed by mechanical dewatering equipment.Therefore, in order to realize deeply dehydrating sludge, become a hot fields of current sludge dewatering based on pretreated reinforcement sludge dehydration technique research and development.
Known sludge pretreatment mode comprises chemistry, physics (inertia flocculating aids, machinery, thermal technology) and combination pre-treatment.Microwave, as one of heat treatment mode, has that rate of heating is fast, homogeneous heating, process are easy to the advantages such as control.Existing research [NeyensE, Baeyens J.A review of thermal sludge pre-treatment processes to improve dewaterability [J] .Journal of Hazardous Materials, 2003,98 (1): 51-67] show, the High Temperature Pre process of Heating temperature more than 130 DEG C, effectively can improve dewatering performance of sludge.But not only energy consumption is high in the micro-wave digestion process of High Temperature High Pressure, airtight compression system is complicated simultaneously, and high temperature, high top pressure operation condition exist potential safety hazard, practical engineering application difficulty.But, have not yet to see the report of the Microwave Pretreatment reinforcement sludge dehydration technique of Central Shanxi Plain temperature (≤100 DEG C) normal pressure.
Summary of the invention
The object of this invention is to provide the method for a kind of microwave-acid-unslaked lime combination reinforcement sludge dehydration, to improve the defect existed in known technology.
For achieving the above object, the method for microwave-acid provided by the invention-unslaked lime combination reinforcement sludge dehydration, comprises the following steps:
1) in mud, add acid solution, the pH value of conditioning of mud is to 2.5-3.0;
2) add unslaked lime, be uniformly mixed;
3) utilize microwave heating to 90-100 DEG C, obtain pretreating sludge;
4) pretreating sludge is carried out mechanical dehydration.
In described method, mud is the mud that sewage work produces, and the mud of sewage work is the mud after preliminary sedimentation tank, second pond, concentration basin and anaerobic digestion, and moisture percentage in sewage sludge is 95%-99.8%.
In described method, acid solution is H
2sO
4one or both in solution or HCl solution.
In described method, step 2) in unslaked lime dosage be 60-100mg/g TS, to ensure that the pH of mud after microwave treatment is at 6.0-7.0.
In described method, step 4) in mechanical dehydration be belt type dehydration, centrifuge dehydration or sheet frame dehydration.
The method of the microwave-acid-unslaked lime combination reinforcement sludge dehydration of confession of the present invention, effectively can improve dewatering performance of sludge, avoid the microwave treatment mode of High Temperature High Pressure, relative known technology not only reduces the dosage of unslaked lime, and significantly reduces energy consumption simultaneously.
Accompanying drawing explanation
Fig. 1 be under different pH Microwave Pretreatment on the impact of dewatering performance of sludge.
Fig. 2 be under different pH Microwave Pretreatment on the impact of mud granule surface electrical behavior.
Fig. 3 is the impact that under different pH, Microwave Pretreatment distributes on sludge returning.
Fig. 4 be under different pH Microwave Pretreatment on the impact of sewage sludge viscosity.
Embodiment
The method of microwave-acid of the present invention-unslaked lime combination reinforcement sludge dehydration, for sludge of sewage treatment plant mechanical dehydration pretreatment modification, realizes deeply dehydrating sludge.
The technical solution used in the present invention comprises the following steps:
1) mud of sewage work is added acid solution in regulating tank, regulate pH to 2.5-3.0, be uniformly mixed; The mud of sewage work can be mud after preliminary sedimentation tank, second pond, concentration basin and anaerobic digestion, and moisture percentage in sewage sludge is 95%-99.8%; Acid solution can be H
2sO
4one or both in solution or HCl solution;
2) mud mixed liquid that step 1 obtains adds unslaked lime and is uniformly mixed, and the add-on of unslaked lime should make the pH of mud after microwave treatment at 6.0-7.0, is convenient to follow-up mechanical sludge dewatering; General add-on is the ratio of 60-100mg/g TS;
3) mud mixed liquid step 2 obtained, by a microwave heating step, utilizes the microwave heating of 600-900W power to 90-100 DEG C, stops heating, obtain pretreatment modification mud after temperature is raised to 90-100 DEG C; Microwave heating frequency is 2450MHz, and magnetron peak power output and Heating temperature are respectively 1kW, 100 DEG C.Reaction vessel is the plastic containers of volume 2L, and upper vessel portion opens wide, and is equipped with stirring rake homogeneous and thermocouple temperature sensor Real-Time Monitoring temperature;
4) the mud direct mechanical dehydration after heated by microwave process, the modes such as mechanical dehydration is belt type dehydration, centrifuge dehydration or sheet frame dehydration realize mud strengthen dewatering.
Mud after pretreatment modification of the present invention, after being measured by vacuum filtration, Triton type 304M CST capillary absorption time detector, sludge specific resistance mensuration, Malvern Mastersizer 2000 (UK) particle size analyzer and Malvern Zetasizer 2000 (UK) zeta potential instrument etc., tool has the following advantages and high-lighting effect:
(1) adopt pretreating sludge of the present invention, simple to operate, without High Temperature High Pressure security risk, and microwave heating speed of response is fast, and conventional heating processing mode needs more than the 30min treatment time, and microwave heating of the present invention only needs about 10min;
(2) dewatering performance of sludge after the inventive method process significantly improves, sludge capillary water absorbing time can be reduced to below 10s, sludge specific resistance can reduce about order of magnitude relative to primary sludge, when not adding flocculation agent, vacuum filtration under 0.035MPa, moisture percentage in sewage sludge can be reduced to about 75%;
(3) in the methods of the invention, after microwave-acid treatment, mud Bound moisture content obviously reduces, sludge returning enlarges markedly, and viscosity reduces, and surperficial electronegativity reduces, then further by adding unslaked lime, regulate pH to 6.0-7.0, can not add flocculation agent and direct mechanical is dewatered, dewatering significantly improves.
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
Mud takes from the second pond of Qinghe sewage work, and mud leaves standstill 12 hours after fetching at 4 DEG C, concentrates and sieves.Get 400mL mud, add 5mol/L sulphur acid for adjusting pH to 2.5, then add 100mg/g TS unslaked lime, stir, under 600W power, microwave heating stops heating after 100 DEG C.After microwave-acid-unslaked lime process, mud tool has the following advantages and gives prominence to effect:
(1) dewatering performance of sludge is significantly improved.Sludge capillary water absorbing time and sludge specific resistance significantly reduce, and capillary water absorbing time is reduced to 9.65s by 22.45s, and the range of decrease is 57.02%; Sludge specific resistance is by 5.61 × 10
8s
2/ g is reduced to 1.05 × 10
8s
2/ g; Under not adding flocculation agent situation, under 0.035MPa, after vacuum filtration, moisture percentage in sewage sludge reduces to 78.83%, and after conditioning, sludge pH is 6.23, is suitable for follow-up mechanical sludge dewatering.
(2) operational condition and the time of sludge pretreatment is reduced.Compare with High Temperature High Pressure sludge pretreatment condition and treatment time, the microwave heating time under condition of normal pressure only has about 5min; Compared with nursing one's health mud with conventional unslaked lime, reduce the dosage of unslaked lime, reduce sludge quantity.
(3) compared under primary sludge and neutrality, alkaline condition, after microwave-sour combination treatment, sludge returning (Fig. 3) obviously increases when pH=2.5; In addition, surperficial electronegativity (Fig. 2) and the sewage sludge viscosity (Fig. 4) of mud obviously reduce, and the change of these mud physicochemical characteristicses is conducive to the dewatering (Fig. 1) of reinforcement sludge.
Claims (6)
1. a method for microwave-acid-unslaked lime combination reinforcement sludge dehydration, comprises the following steps:
1) in mud, add acid solution, the pH value of conditioning of mud is to 2.5-3.0;
2) add unslaked lime, be uniformly mixed;
3) utilize microwave heating to 90-100 DEG C, obtain pretreating sludge;
4) pretreating sludge is carried out mechanical dehydration.
2. method according to claim 1, wherein, mud is the mud that sewage work produces.
3. method according to claim 2, wherein, the mud of sewage work is the mud after preliminary sedimentation tank, second pond, concentration basin and anaerobic digestion, and moisture percentage in sewage sludge is 95%-99.8%.
4. method according to claim 1, wherein, acid solution is H
2sO
4one or both in solution or HCl solution.
5. method according to claim 1, wherein, the unslaked lime dosage in step 2 is 60-100mg/g TS, to ensure that the pH of mud after microwave treatment is at 6.0-7.0.
6. method according to claim 1, wherein, the mechanical dehydration in step 4 is belt type dehydration, centrifuge dehydration or sheet frame dehydration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410510096.6A CN104291549A (en) | 2014-09-28 | 2014-09-28 | Method for enhancing sludge dewatering by combining microwaves, acids and quick lime |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410510096.6A CN104291549A (en) | 2014-09-28 | 2014-09-28 | Method for enhancing sludge dewatering by combining microwaves, acids and quick lime |
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|---|---|
| CN104291549A true CN104291549A (en) | 2015-01-21 |
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| CN201410510096.6A Pending CN104291549A (en) | 2014-09-28 | 2014-09-28 | Method for enhancing sludge dewatering by combining microwaves, acids and quick lime |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112174468A (en) * | 2020-09-28 | 2021-01-05 | 江苏大学 | Sludge deep dehydration method based on sludge hydrothermal carbonization filtrate |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55114400A (en) * | 1979-02-23 | 1980-09-03 | Nisshin Steel Co Ltd | Dehydration and drying of sludge |
| CN101948225A (en) * | 2010-09-14 | 2011-01-19 | 长沙洁湘环保工程有限公司 | Method for quickly dewatering and effectively removing heavy metals from primary sludge |
| CN102408178A (en) * | 2010-09-21 | 2012-04-11 | 上海市政工程设计研究总院 | Deep dewatering method for sludge |
| CN103030259A (en) * | 2013-01-07 | 2013-04-10 | 北京科技大学 | Method for conditioning and dehydrating residual sludge |
| CN103896475A (en) * | 2014-03-13 | 2014-07-02 | 南京道科环境科技有限公司 | Regulation method for high-dryness dehydration of sludge |
-
2014
- 2014-09-28 CN CN201410510096.6A patent/CN104291549A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55114400A (en) * | 1979-02-23 | 1980-09-03 | Nisshin Steel Co Ltd | Dehydration and drying of sludge |
| CN101948225A (en) * | 2010-09-14 | 2011-01-19 | 长沙洁湘环保工程有限公司 | Method for quickly dewatering and effectively removing heavy metals from primary sludge |
| CN102408178A (en) * | 2010-09-21 | 2012-04-11 | 上海市政工程设计研究总院 | Deep dewatering method for sludge |
| CN103030259A (en) * | 2013-01-07 | 2013-04-10 | 北京科技大学 | Method for conditioning and dehydrating residual sludge |
| CN103896475A (en) * | 2014-03-13 | 2014-07-02 | 南京道科环境科技有限公司 | Regulation method for high-dryness dehydration of sludge |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112174468A (en) * | 2020-09-28 | 2021-01-05 | 江苏大学 | Sludge deep dehydration method based on sludge hydrothermal carbonization filtrate |
| CN112174468B (en) * | 2020-09-28 | 2022-10-28 | 江苏大学 | Sludge deep dehydration method based on sludge hydrothermal carbonization filtrate |
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Application publication date: 20150121 |
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