CN101913745B - Process for removing heavy metal from sludge of sewage treatment plants - Google Patents
Process for removing heavy metal from sludge of sewage treatment plants Download PDFInfo
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- CN101913745B CN101913745B CN2010102536161A CN201010253616A CN101913745B CN 101913745 B CN101913745 B CN 101913745B CN 2010102536161 A CN2010102536161 A CN 2010102536161A CN 201010253616 A CN201010253616 A CN 201010253616A CN 101913745 B CN101913745 B CN 101913745B
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- sludge
- heavy metal
- bioleaching
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- mud
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
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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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Abstract
The invention discloses a process for removing heavy metals from sludge of sewage treatment plants. The process comprises the following steps of: adding 0.5 to 30g of elemental sulfur in each litre of sludge in a bioleaching tank, respectively inoculating 1 to 5 percent of thiobacilli and 1 to 3 percent of acidophilus moulds in the bioleaching tank, carrying out aerated bioleaching on the obtained sludge for 2 to 6 days until the pH value of the obtained sludge in the bioleaching tank is less than 2, and pumping the sludge subjected to bioleaching treatment in a plate-and-frame filter press by using a pump to carry out filter press separation so as to obtain sludge from which heavy metal is removed and sewage containing the heavy metal; adding alkali into the sludge from which heavy metal is removed to neutralize the sludge and then transporting the sludge to a sludge composting plant for composting; adding alkali into the sewage containing the heavy metal until the pH value of the sewage is about 7, then putting the sewage into an electrolytic flocculation floatation device to carry out electrolytic flocculation and self-floatation treatments on the sewage, and after the obtained liquid supernatant reaches the standard, draining the liquid supernatant; and pumping the flocculated scum of the pollutant in water into the plate-and-frame filter press for separation to obtain corresponding filter liquor and sludge, wherein the filter liquor is drained to a waste liquor recovery tank, and the sludge is transported to a hazardous waste disposal center for treatment. The process of the invention has the advantages of shortening the lixiviation period, improving the lixiviation efficiency and the variety of lixiviated heavy metal, ensuring the stability of removing heavy metal, and saving equipment investment.
Description
Technical field
The present invention relates to the environmental protection field, especially relate to the removing process of heavy metal in a kind of sewage plant sludge.
Background technology
CN200410014801.X discloses heavy metal biological removing process and equipment thereof in a kind of mud.Its device comprises the mud equalizing tank, exports bioleaching pond, the substrate throwing device that is installed in top, bioleaching pond that is communicated with, gas blower, acidification sludge settling tank, collecting tank, the device for dehydrating sladge waste that is installed in below, bioleaching pond with the mud equalizing tank.Its removing process be in the bioleaching pond, add ferrous and reducible sulfur etc. and logical oxygen condition under, utilize the biological oxidation of thiobacillus and the low pH environment of generation thereof to make the heavy metal stripping of insoluble form existence enter water, remove by solid-liquid separation, sulfide changes vitriol into by oxygenizement again.But because it is to use single thiobacillus, cause the single microorganism lixiviate cycle long, efficient is on the low side, leach defectives such as the heavy metal kind is single; Be difficult to guarantee the stability of heavy metal removal.And this bioleaching technology needs newly-built relevant facility, increases cost of investment.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, heavy metal removing technology in a kind of mud is provided, to realize the shortening lixiviate cycle, improve extracting efficiency and to leach the heavy metal kind, to guarantee the stability that heavy metal is removed; The investment that simultaneously can save bioleaching equipment.
Method of the present invention may further comprise the steps:
(1) bioleaching is handled: add the 0.5-30g elemental sulfur by every liter of mud in the bioleaching pond, inoculation quality is than having a liking for sour mould for the thiobacillus of 1-5% and 1-3% respectively, aeration leaching 2-6 days, to pH value less than 2, the stripping of insoluble heavy metal is entered water;
(2) filter press separates: the sludge pump after with pump bioleaching being handled is gone into the sheet frame pressure filter and is carried out the press filtration separation, the sewage that obtains removing the mud of heavy metal and contain heavy metal;
(3) to add the alkali pH value that neutralizes be 6-7 to the mud that removes heavy metal, is transported to sludge composting factory compost;
(4) sewage that contains heavy metal enters the waste liquid pond for recovering, adds alkali and regulates about pH value to 7, enters electric flocculation-air floating device; Carry out electricity flocculation and self-float process by existing electric flocculation-air floating technology, the supernatant liquor qualified discharge after the electricity flocculation self-float process; Pollutent flco come-up in the water; Scum silica frost pumps into plate-and-frame filter press to be separated, and its filtrate returning enters the waste liquid pond for recovering, and mud is delivered to Hazardous wastes and disposed center processing.
It is to reserve the mud of 5%-10% as acclimation sludge that described bioleaching is handled at every turn, discharges pending mud, adds the 0.5-30g elemental sulfur by every liter of mud again.
Described bioleaching pond is to be formed through anticorrosion transformation by the sludge of sewage treatment plants aerobic digestion tank.
Advantage of the present invention: the solid holdup environment that (1) has a liking for the optimum growh of sour mould and thiobacillus is about 2 ~ 10%, with about 5% basically identical of the solid holdup of sludge of sewage treatment plants aerobic digestion tank, so aerobic digestion tank can be transform as the bioleaching reaction tank.Not only save the secondary construction cost, and prevented that mud from advancing the water resource waste problem that adds water readjustment solid holdup behind the composting plant.(2) sour mould and thiobacillus are had a liking in interpolation in the bioleaching reaction tank; The Thiobacillus chemoautotrophic bacteria the particularly low-molecular-weight organic acid of water miscible organism is had certain sensitivity, and water soluble organic substance content can reach 1000mg/L in the mud.Utilize water miscible organism growth and breeding in the mud and have a liking for sour mould, consume water miscible organism in the mud, reach elimination and reduce the poisoning effect of water soluble organic substance, improved the growth activity of thiobacillus the chemoautotrophy thiobacillus.System need not pre-acidifying, only depend on the product acid amount of having a liking for sour mould that the PH of system is dropped to about 2, not only provide suitable pH value environment for thiobacillus, most of heavy metal in the also sour stripping mud of while, can shorten the removal cycle of sludge heavy-metal, increase the removal kind and the clearance of heavy metal in the mud; Save the dosing cost, reaction temperature and, non-secondary pollution.(3) after leaching is handled, need not to add flocculation agent before the sludge press filtration, can save the sludge dewatering cost greatly; (4) after leaching was handled, dewatering performance of sludge improved, and the direct press filtration of mud can make water ratio reach below 60%, satisfies the requirement of sludge aerobic compost to water ratio.
Description of drawings
Accompanying drawing is a process flow sheet of the present invention.
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing.
Embodiment 1:
(1) bioleaching is handled: with the sludge of sewage treatment plants aerobic digestion tank through the anticorrosion bioleaching pond that is transformed into, in the pond, add elemental sulfur 0.5-30g/L mud, and inoculation quality carried out the aeration leaching 2-6 days than having a liking for sour mould for the thiobacillus of 1%-5% and 1%-3% respectively; To pH value less than 2.This moment, the heavy metal solubility rate reached standard;
(2) filter press separates: the mud after with pump bioleaching being handled and water pump into first plate-and-frame filter press to carry out press filtration and separates the sewage that obtains removing the mud of heavy metal and contain heavy metal; The sewage that contains heavy metal enters the waste liquid pond for recovering;
(3), the mud that removes heavy metal adopts in the alkaline matter and after, be transported to sludge composting factory compost;
(4) contain heavy metal containing sewage and add about alkali conciliation pH value to 7, enter electric flocculation-air floating device; Carry out electricity flocculation and self-float process by existing electric flocculation-air floating technology, the water qualified discharge after the electricity flocculation self-float process; Pollutent flco come-up in the water; Scum silica frost enters second plate-and-frame filter press to be separated; Filtrate is returned the waste liquid pond for recovering; Mud is delivered to Hazardous wastes and is disposed center processing.
Embodiment 2:
The bioleaching pond of present embodiment is a facility of copying the aerobic digestion tank transformation to form as different from Example 1.
Embodiment 3:
The bioleaching pond of present embodiment is that anaerobic digester is formed through anticorrosion and the transformation of interpolation aerating apparatus as different from Example 1.
Claims (3)
1. the removing process of heavy metal in the sewage plant sludge is characterized in that, may further comprise the steps:
(1) bioleaching is handled: add the 0.5-30g elemental sulfur by every liter of mud in the bioleaching pond, inoculation quality is than having a liking for sour mould for the thiobacillus of 1-5% and 1-3% respectively, aeration leaching 2-6 days, to the pH value less than 2, the stripping of insoluble heavy metal is entered water;
(2) filter press separates: the sludge pump after with pump bioleaching being handled is gone into the sheet frame pressure filter and is carried out the press filtration separation, the sewage that obtains removing the mud of heavy metal and contain heavy metal;
(3) mud that removes heavy metal adds the alkali pH value that neutralizes and is 6-7, is transported to sludge composting factory compost;
(4) sewage that contains heavy metal enters the waste liquid pond for recovering, adds alkali and regulates about pH value to 7, enters electric flocculation-air floating device; Carry out electricity flocculation and self-float process by existing electric flocculation-air floating technology, the supernatant liquor qualified discharge after the electricity flocculation self-float process; Pollutent flco come-up in the water; Scum silica frost pumps into plate-and-frame filter press to be separated, and its filtrate returning enters the waste liquid pond for recovering, and mud is delivered to Hazardous wastes and disposed center processing.
2. the removing process of heavy metal is characterized in that in a kind of sewage plant sludge according to claim 1, and described bioleaching pond is to be formed through anticorrosion transformation by the sludge of sewage treatment plants aerobic digestion tank.
3. the removing process of heavy metal in a kind of sewage plant sludge according to claim 1, it is characterized in that, it is to reserve the mud of 5%-10% as acclimation sludge that described bioleaching is handled at every turn, discharges pending mud, adds the 0.5-30g elemental sulfur by every liter of mud again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102536161A CN101913745B (en) | 2010-08-16 | 2010-08-16 | Process for removing heavy metal from sludge of sewage treatment plants |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102536161A CN101913745B (en) | 2010-08-16 | 2010-08-16 | Process for removing heavy metal from sludge of sewage treatment plants |
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| CN101913745A CN101913745A (en) | 2010-12-15 |
| CN101913745B true CN101913745B (en) | 2011-12-28 |
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| CN2010102536161A Expired - Fee Related CN101913745B (en) | 2010-08-16 | 2010-08-16 | Process for removing heavy metal from sludge of sewage treatment plants |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105969693A (en) * | 2016-06-16 | 2016-09-28 | 盐城工学院 | Biological leaching agent for treating aluminum profile nickel plating sludge and application of biological leaching agent |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITPC20120008A1 (en) * | 2012-03-22 | 2013-09-23 | Fabio Cella | METHOD AND PLANT FOR THE CHEMICAL-PHYSICAL TREATMENT OF BIOLOGICAL PURIFICATION SLUDGE |
| CN102863133A (en) * | 2012-10-31 | 2013-01-09 | 中国石油化工股份有限公司 | Biological method for removing and recovering cobalt, manganese metals from chemical fiber PTA wastewater biological-treatment excess sludge |
| CN104370411A (en) * | 2014-10-20 | 2015-02-25 | 苏州富奇诺水治理设备有限公司 | Method for removing heavy metals from industrial wastewater |
| CN105836990B (en) * | 2015-01-14 | 2019-12-06 | 北京中科国通环保工程技术股份有限公司 | Method and device for bioleaching and drying sludge |
| CN109071293A (en) * | 2016-08-23 | 2018-12-21 | 倢旸股份有限公司 | The recovery method of heavy metal sewage sludge |
| CN109081533A (en) * | 2017-06-14 | 2018-12-25 | 刘汉东 | Sludge of sewage treatment plant method of comprehensive utilization and device |
| CN107434751A (en) * | 2017-08-04 | 2017-12-05 | 山东森博生物科技有限公司 | A kind of method that biological organic carbon fertilizer is produced using black liquor of pulp making |
| CN109020139B (en) * | 2018-07-19 | 2021-07-09 | 广州福之源环保科技有限公司 | Municipal sludge reduction method |
| CN110104788B (en) * | 2019-04-03 | 2022-01-11 | 华南师范大学 | Mercury-containing wastewater treatment method and device |
| CN112142281B (en) * | 2020-09-09 | 2022-09-30 | 朱栋梁 | Contaminated fluid treatment system |
| CN113582485A (en) * | 2021-07-14 | 2021-11-02 | 浙江大学 | Bioleaching method and equipment for separating acid production and heavy metal removal process |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| AP1421A (en) * | 1999-09-07 | 2005-06-03 | Billiton Intellectual Property B V | Bioleaching of sulphide minerals. |
| CN1323959C (en) * | 2004-04-30 | 2007-07-04 | 南京农业大学 | Process and its device for biologically removing heavy metal in mud |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105969693A (en) * | 2016-06-16 | 2016-09-28 | 盐城工学院 | Biological leaching agent for treating aluminum profile nickel plating sludge and application of biological leaching agent |
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| CN101913745A (en) | 2010-12-15 |
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Effective date of registration: 20180808 Address after: 417009 13 Hong Kong Street, Loudi Economic Development Zone, Hunan Patentee after: Hunan Desp biological science and Technology Co Ltd Address before: 417009 Taihe Industrial Park, Loudi economic and Technological Development Zone, Hunan, China Patentee before: Yude Sci-Tech Co., Ltd., Lowdi |
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Denomination of invention: Process for removing heavy metal from sludge of sewage treatment plants Effective date of registration: 20181127 Granted publication date: 20111228 Pledgee: Loudi Jinhong Investment Enterprise (Limited Partnership) Pledgor: Hunan Desp biological science and Technology Co Ltd Registration number: 2018430000113 |
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