CN104671624B - A kind of low cost sludge containing heavy metal processing method - Google Patents
A kind of low cost sludge containing heavy metal processing method Download PDFInfo
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- CN104671624B CN104671624B CN201510068719.3A CN201510068719A CN104671624B CN 104671624 B CN104671624 B CN 104671624B CN 201510068719 A CN201510068719 A CN 201510068719A CN 104671624 B CN104671624 B CN 104671624B
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- heavy metal
- sludge
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
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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
- C02F11/02—Biological treatment
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/20—Sludge processing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention discloses a kind of low cost sludge containing heavy metal processing method, its step for first adding MBR membrane cisterna by adding acid for adjusting pH value by high-moisture-contensludge sludge to 3-5, water outlet after MBR membrane cisterna processes enters heavy metal adsorption equipment, enters MBR terminal reseavoir afterwards, then enters sludge concentration tank；Described High water cut excess sludge after MBR membrane cisterna filters is from flowing to the dense concentration basin of mud, enter sludge dewatering equipment dehydration afterwards, moisture content after dehydration be 80% wet mud enter in solar energy composite membrane low-temperature evaporation equipment and carry out evaporation drying, distilled water reuse after evaporation or qualified discharge, the high dewatered sludge after mummification can be used as biological organic fertilizer agricultural use。Operating cost of the present invention is low, treatment effeciency is high, and the equipment in technical process is easy to operate, and sludge containing heavy metal after treatment can ensure that and reaches country's Its Relevant Technology Standards requirement。
Description
Technical field
The present invention relates to contaminated soil dewatered sludge technical field innoxious, that the wet mud of recycling treatment Sewage Plant biochemical sedimentation basin maybe needs reparation, the new method that specifically a kind of sludge containing heavy metal processes。
Background technology
Along with the discharge capacity of the quickening of urbanization process, sanitary wastewater and trade effluent is increasing, the sludge yield as sewage disposal by-product also increases accordingly。Sludge components is complicated, and moisture content is high and not easily dehydration, and containing the organic pollution of more difficult degradation, harmful heavy metal and pathogenic microorganism etc., serious threat the existence of the mankind, health and develops。Facts have proved that recycling sludge utilization is the inevitable outlet of Treatment of Sludge, but the heavy metal exceeding half in sewage disposal process can be transferred in mud, the heavy metal in mud seriously hinders the recycling of mud。When mud containing higher heavy metal carries out agricultural, not only increasing the content of beary metal in crop body, also causing heavy metal pollution of soil, when there is precipitation, in mud and soil, a part of heavy metal enters rainwash and underground percolation and elapses with current, and then subsoil water is caused secondary pollution。
Along with industrial, agriculture fast development, the sharp increase of population, environmental pollution is day by day serious, soil unavoidably suffers heavy metal pollution, heavy metal pollution of soil is one of main ecological environment problem, directly influence local ecosystem to stablize and food safety, be related to sustainable development and the health of economy especially agricultural, thus cause social relations widely。Present Situation of Soil Heavy Metal Pollution and principal character are analyzed, in conjunction with domestic and international heavy metal pollution of soil research trends, consider that Demand of Nation and regional economic development need, it is proposed to the high efficiency, low cost rehabilitating soil technology inventing a kind of applicable China's actual conditions is necessary simultaneously。
Existing heavy metal sewage sludge processing method is to adopt heavy metal in attractive gel lignin-sludge, in attractive gel lignin-sludge, heavy metal is directly to be stirred with attractive gel by mud, mixing a period of time, gel and mud, by gel absorption, are being easily separated by the heavy metal in mud by parsing。In this lignin-sludge, the method for heavy metal is primarily present problem has: one is that mud mixes with gel and is not easy uniformly；Two is that gel is wrapped up by mud, cause gel can only adsorb the heavy metal in mud proximate to it, there is the Heavy Metals in Sludge of certain distance to can not get removing with gel, and in long-play process, mud can slowly block the absorption hole of gel surface, thus reducing adsorption effect；Three is gel has partial gel little granule when being easily separated with mud and is mixed in mud。
Summary of the invention
The purpose of the present invention is aiming at above-mentioned the deficiencies in the prior art, it is provided that a kind of efficient low cost heavy metal sewage sludge processing method。
The technical solution used in the present invention is as follows:
A kind of low cost sludge containing heavy metal processing method, is characterized in that processing step as follows:
First by moisture content mud more than 97% in sewage treatment plant's biochemical sedimentation basin by squeezing into MBR membrane cisterna with pump after acid adding stirring and adjusting pH value to 3-5, through MBR membrane cisterna process after go out in water Liu Dao heavy metal adsorption equipment to carry out active adsorption, cleaning water after heavy metal adsorption equipment adsorbs is back in MBR membrane cisterna, circulating reflux is adsorbed, until content of beary metal flows into MBR film end pond after reaching country's associated emissions index again from heavy metal adsorption equipment cleaning water out, then enter sludge concentration tank；Adsorbing material in described heavy metal adsorption equipment is after the accumulation of the content of beary metal of absorption is saturated, adsorption material parison therein is entered in acid-base solution, the heavy metal in adsorbing material is made to deviate from, the heavy metal residue deviate from stirs solidification together with cement and is pressed into cement brick utilization, or separating waste residues heavy metal recovery recycles further；Described sewage treatment plant biochemical sedimentation basin mud is interior after multi-ultrafiltration membrane filtration by MBR membrane cisterna, excess sludge flows automatically to sludge concentration tank, squeeze into sludge pump again and in sludge dewatering equipment, carry out dehydration, make moisture percentage in sewage sludge below 85%, wet mud high-pressure pump or conveying worm after dehydration are distributed in solar energy composite membrane low-temperature evaporation equipment and carry out evaporation drying, through distilled water reuse or the qualified discharge of evaporation, the high dewatered sludge after mummification is as biological organic fertilizer agricultural effect；The effluent recycling deviate from described dehydration is to described sewage treatment plant biochemical sedimentation basin。
The acid added in described acid adding whipping process is sulphuric acid or citric acid。
Agitating device in described sewage treatment plant biochemical sedimentation basin adopts motor blender to be stirred, or adopts compression air to be stirred。
Membrane component in described MBR membrane cisterna adopts organic membrane or inoranic membrane, and the aeration in membrane cisterna adopts boring aeration or middle micropore aerator aeration。
The adsorbing material of filling in described heavy metal adsorption equipment, adopt common yin, yang resin or macroporous resin adsorption, or adopting geology mineral matter adsorbing material or gel rubber material to adsorb, the absorption tank body of described heavy metal adsorption equipment adopts steel lining anti-corrosion material, rustless steel or glass steel material to be fabricated directly into shape。
Beneficial effects of the present invention has:
Operating cost of the present invention is low, treatment effeciency is high, and the equipment of technical process is easy to operate, and sludge containing heavy metal after treatment can ensure that and reaches country's Its Relevant Technology Standards requirement。Dewatered sludge can comprehensively utilize, and the distilled water that low temperature distillation goes out can reuse or qualified discharge。The collecting and distributing control of integrated artistic equipment DCS, automation mechanized operation。What MBR membrane filtration went out adsorbs finally by adsorption plant containing heavy metal water outlet, can effectively remove the content of beary metal in water, adsorbent entirely reach saturated after again carry out regeneration desorption, adsorbing material is renewable to be reused, which reducing adsorbent amount, the water outlet after adopting MBR membrane technology to filter is transparent, turbidity is low。The pollutant pollution to resin can be reduced when entering the absorption of heavy metal adsorption equipment, improve in mud and remove the efficiency of heavy metal and reduce operating cost。
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described:
Sewage treatment plant's biochemical sedimentation basin mud can individual processing, it is possible to be mixed together process with the heavy-metal contaminated soil that need to repair。A small amount of acid for adjusting pH value only need to be added in sludge agitation pond during individual processing；Appropriate water need to be added during mixed processing and be adjusted to moisture content more than 97%, be simultaneously introduced a small amount of acid for adjusting pH value and can enter MBR membrane cisterna and carry out aeration filtration process。
The inventive method step is first the mud more than 97% of the moisture content in sewage treatment plant's biochemical sedimentation basin is added the conventional acid such as sulphuric acid or citric acid, stirring and adjusting pH value squeezes into pond, MBR film front end with pump to 3-5, water outlet after MBR membrane cisterna processes is flow automatically or is got to pump in heavy metal adsorption equipment and carries out active adsorption, cleaning water after heavy metal adsorption equipment adsorbs is back in MBR membrane cisterna, circulating reflux number of times is determined according to the heavy metal concentration in water, circulation absorption is gradually lowered the content of beary metal in water until flowing into MBR film end pond again after reaching country's associated emissions index from heavy metal adsorption equipment water out by the detection of determining heavy metals instrument after refluxing again, effluent recycling not up to standard is reprocessed in pond, MBR film front end, the outlet of MBR terminal reseavoir connects sludge concentration tank。Adsorbing material in described heavy metal adsorption equipment is after the content of beary metal accumulation of absorption is saturated, adsorption material parison therein is entered in the hydrochloric acid or sulphuric acid that mass fraction content is 3%～5%, making the heavy metal in adsorbing material deviate from, the heavy metal residue deviate from can stir solidification together with cement and be pressed into cement brick utilization。Described sewage treatment plant biochemical sedimentation basin mud by multistage MBR membrane cisterna after multi-ultrafiltration membrane filtration, excess sludge flows automatically to sludge concentration tank, then squeezes into sludge pump and carry out dehydration in sludge dewatering equipment, makes moisture percentage in sewage sludge below 85%。Sludge dewatering equipment can adopt the mechanical dehydration machine dehydration such as centrifugal dehydrator or belt type dewaterer。Wet mud high-pressure pump or conveying worm after dehydration are distributed in solar energy composite membrane low-temperature evaporation equipment and carry out evaporation drying, through distilled water reuse or the qualified discharge of evaporation, the high dewatered sludge (moisture content≤10%) after mummification is as biological organic fertilizer agricultural effect。The effluent recycling deviate from described dehydration is to described sewage treatment plant biochemical sedimentation basin。
Agitating device in sewage treatment plant of the present invention biochemical sedimentation basin can adopt motor blender to be stirred, or adopts compression air to be stirred。Membrane component in MBR membrane cisterna adopts organic membrane or inoranic membrane, and the aeration in membrane cisterna can adopt boring aeration or middle micropore aerator aeration。The adsorbing material of filling in described heavy metal adsorption equipment, common yin, yang resin or macroporous resin adsorption can be adopted, may be used without geology mineral matter adsorbing material or gel rubber material adsorbs, the absorption tank body of heavy metal adsorption equipment can adopt the corrosion resistant materials such as steel lining anti-corrosion material, rustless steel or fiberglass to be fabricated directly into shape。
Solar energy composite membrane low-temperature evaporation equipment of the present invention adopts and utilizes the heat low-temperature evaporation of sunlight to carry out the high humidity mud in evaporation drying film frame in combination with the air-dry technology of waste heat in confined space, so as to mummification rapidly, not have solar time can adopt air-dry in conjunction with waste heat evaporation mummification。The distilled water qualified discharge evaporated or reuse；Air-dry technology is utilized to install odor removal additional at air outlet when drying wet mud。
In the present invention, the operation of each process equipment controls there is DCS Distributed Control System Automatic Control。Membrane component and aeration agitation system it is provided with in MBR membrane cisterna, in order to ensure in the scope that the sludge concentration in membrane cisterna is maintained at homeostasis value, low by the delivery turbidity after membrane filtration, follow-up heavy metal adsorption equipment is played a protective role。Heavy metal adsorption equipment adsorbed by adsorbing material after cleaning water be back to MBR membrane cisterna to regulate the sludge concentration in membrane cisterna, circulation absorption refluxes again, it is ensured that stream controls in satisfactory scope to the sludge heavy-metal content in sludge concentration tank。Full-automatic online sludge concentration measuring instrument is set in MBR membrane cisterna。Be provided with heavy metal on-line measurement instrument in sludge concentration tank, with ensure MBR membrane cisterna stream to content of beary metal in the high-moisture-contensludge sludge of sludge concentration tank lower than in critical field。
Need restoration of soil polluted by heavy metal dewatered sludge because there is no activity, so mixing match process should be carried out in conjunction with sewage treatment plant's biochemical sedimentation basin excess sludge, high-moisture-contensludge sludge after treatment can be utilized by direct returning to farmland by (contaminated soil remediation becomes organic soil) after mechanical dehydration machine dehydration。
Other the undeclared part that the present invention relates to is same as the prior art。
Claims (5)
1. a low cost sludge containing heavy metal processing method, is characterized in that processing step as follows:
First by moisture content mud more than 97% in sewage treatment plant's biochemical sedimentation basin by squeezing into pond, MBR film front end with pump after acid adding stirring and adjusting pH value to 3-5, through pond, MBR film front end, pond, rear end process after go out in water Liu Dao heavy metal adsorption equipment to carry out active adsorption, cleaning water after heavy metal adsorption equipment adsorbs is back in pond, MBR film front end, circulating reflux is adsorbed, until flowing into MBR film end pond again after content of beary metal in heavy metal adsorption equipment cleaning water out is lower than country's associated emissions index, adsorbing material in described heavy metal adsorption equipment is after the accumulation of Adsorption of Heavy Metals content is saturated, adsorption material parison therein is entered mass fraction content is in 3% ~ 5% hydrochloric acid or sulphuric acid, the heavy metal in adsorbing material is made to deviate from, the heavy metal residue deviate from stirs solidification together with cement and is pressed into cement brick utilization；Described sewage treatment plant biochemical sedimentation basin mud is interior after multi-ultrafiltration membrane filtration by MBR membrane cisterna, residue high-moisture-contensludge sludge flows automatically to sludge concentration tank, squeeze into sludge pump again and in sludge dewatering equipment, carry out dehydration, make moisture percentage in sewage sludge below 85%, wet mud high-pressure pump or conveying worm after dehydration are distributed in solar energy composite membrane low-temperature evaporation equipment and carry out evaporation drying, through distilled water reuse or the qualified discharge of evaporation, the high dewatered sludge after mummification is as biological organic fertilizer agricultural effect；The effluent recycling deviate from described dehydration is to described sewage treatment plant biochemical sedimentation basin。
2. low cost sludge containing heavy metal processing method according to claim 1, is characterized in that the acid added in described acid adding whipping process is sulphuric acid or citric acid。
3. low cost sludge containing heavy metal processing method according to claim 1, is characterized in that the agitating device in described sewage treatment plant biochemical sedimentation basin adopts motor blender to be stirred, or adopts compression air to be stirred。
4. low cost sludge containing heavy metal processing method according to claim 1, is characterized in that the membrane component in described MBR membrane cisterna adopts organic membrane or inoranic membrane, and the aeration in membrane cisterna adopts boring aeration or middle micropore aerator aeration。
5. low cost sludge containing heavy metal processing method according to claim 1, it is characterized in that the adsorbing material of filling in described heavy metal adsorption equipment, adopt common yin, yang resin or macroporous resin adsorption, or adopting geology mineral matter adsorbing material or gel rubber material to adsorb, the absorption tank body of described heavy metal adsorption equipment adopts steel lining anti-corrosion material, rustless steel or glass steel material to be fabricated directly into shape。
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| CN104671624B true CN104671624B (en) | 2016-06-22 |
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| CN105945065B (en) * | 2016-05-30 | 2020-11-13 | 青岛理工大学 | Heavily-polluted site Cu in-situ and ex-situ coupling detoxification method based on biogas residues |
| CN105945055A (en) * | 2016-05-30 | 2016-09-21 | 青岛理工大学 | Heavily-polluted site Hg in-situ and ex-situ coupling detoxification method based on biogas residues |
| CN106040735B (en) * | 2016-05-30 | 2020-12-15 | 青岛理工大学 | Heavily-polluted site Cu in-situ and ex-situ coupling detoxification method |
| CN105935695A (en) * | 2016-05-30 | 2016-09-14 | 青岛理工大学 | Novel contaminated site Hg in-situ detoxifying method based on biogas residues |
| CN106031927A (en) * | 2016-05-30 | 2016-10-19 | 青岛理工大学 | Novel contaminated site Zn in-situ detoxification method based on biogas residues |
| CN105945056B (en) * | 2016-05-30 | 2021-01-05 | 青岛理工大学 | Heavy pollution site Cd in-situ and ex-situ coupling detoxification method based on biogas residues |
| CN105935696A (en) * | 2016-05-30 | 2016-09-14 | 青岛理工大学 | Novel pollution site Cd in-situ detoxification method based on biogas residues |
| CN106977076B (en) * | 2017-05-02 | 2019-07-02 | 温州广德建设有限公司 | Municipal sludge processing method |
| CN109724927A (en) * | 2018-12-21 | 2019-05-07 | 江苏大学 | A kind of measuring method of block filler phosphorus adsorbance in practical applications |
| CN109534649B (en) * | 2019-01-07 | 2021-11-05 | 深圳市新涛环境科技有限公司 | Low-temperature closed circulation sludge drying intelligent device |
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| JP3767433B2 (en) * | 2001-08-22 | 2006-04-19 | 栗田工業株式会社 | Decontamination / dismantling wastewater treatment method for waste incinerator facilities |
| CN101774725A (en) * | 2009-01-13 | 2010-07-14 | 厦门市威士邦膜科技有限公司 | Electroplating wastewater treatment process and equipment |
| CN101863600B (en) * | 2009-04-16 | 2013-06-26 | 上海综宝环境工程有限公司 | Method for removing heavy metals from activated sludge |
| TWI414345B (en) * | 2010-01-04 | 2013-11-11 | Taiwan Textile Res Inst | A nanofiber-containing membrane, a composite membrane, a process for producing them and their use |
| IT1402865B1 (en) * | 2010-11-05 | 2013-09-27 | Univ Roma | PROCEDURE FOR THE TREATMENT OF CONTAMINATED WATER |
| CN102826717A (en) * | 2012-09-13 | 2012-12-19 | 江苏艾特克环境工程有限公司 | Device and method for processing coal mine wastewater containing heavy metal |
| CN203683307U (en) * | 2013-05-22 | 2014-07-02 | 汪德进 | Membrane separation and foam separation combined heavy metal wastewater treatment system |
| CN204079718U (en) * | 2014-09-29 | 2015-01-07 | 中国电建集团中南勘测设计研究院有限公司 | One heavy metal species chemical leaching liquid waste disposal, recycling integrated device |
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