CN101962254B - Eluant for removing heavy metal from municipal sludge - Google Patents
Eluant for removing heavy metal from municipal sludge Download PDFInfo
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- CN101962254B CN101962254B CN201010253412A CN201010253412A CN101962254B CN 101962254 B CN101962254 B CN 101962254B CN 201010253412 A CN201010253412 A CN 201010253412A CN 201010253412 A CN201010253412 A CN 201010253412A CN 101962254 B CN101962254 B CN 101962254B
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Abstract
The invention relates to an eluant for removing heavy metal from municipal sludge, which comprises the following components in parts by weight: 50-500 parts of polyhydric alcohol phosphate ester, 10-50 parts of polymaleic anhydride, 136-272 parts of zinc chloride and 95000-99000 parts of water. A preparation method of the eluant comprises the steps of mixing and stirring the components in a mixed kettle with the stirring speed of 120-180rpm at the temperature of 30-40 DEG C for 10-20 minutes, wherein, the molecular weight of the polymaleic anhydride is 400-600; when consumption of the polymaleic anhydride is not more than 30 parts, the pH value of the obtained mixed solution is 4.5-6; and when the consumption of the polymaleic anhydride is more than 30 parts, the pH value of the obtained solution blended with a sodium hydroxide solid is 8-9. The eluant of the invention can elute the heavy metal without environmental and water pollution, enrich the heavy metal by subsequent treatment and obtain obvious economic benefit with low cost by adopting a small amount of active constituents; and the eluant is simple for operation and has wide applicability.
Description
Technical field
The present invention relates to a kind of eluent of removing heavy metal in the municipal sludge, especially a kind of eluent that is used to handle the municipal sludge of high content of beary metal belongs to the reparation field of heavy-metal contaminated soil and mud.
Background technology
Municipal sludge is meant the solid waste that produces in city domestic sewage, the Industrial Wastewater Treatment process, is the continuity product of municipal sewage plant, continually.In recent years, along with the quickening and the industrial expansion of Development of China's Urbanization, the improving constantly of treatment rate of domestic sewage, the output of municipal sludge also increases sharply.Municipal sludge contains abundant nitrogen, phosphorus and trace element, is the high-quality base-material of fertilizer and soil conditioner.Yet mud generally contains more heavy metal, in utilizing process, is prone to soil, underground water, plant etc. are polluted and damage.Potential destruction risk to ecological environment is a large amount of biggest obstacles of using of restriction municipal sludge.Therefore, how to remove or reduce content of beary metal in the municipal sludge and become the problem that municipal sludge is handled and recycling must solve.
At present, the restorative procedure to the removal of the heavy metal in municipal sludge main reference heavy-metal contaminated soil mainly contains following several kinds:
One, engineering control: comprise soil removal and replacement, curing, electrodynamics method etc.;
Two, chemical harnessing: comprise chemical extraction (drip washing, extraction), use modifying agent etc.;
Three, biological treating: comprise microorganism absorption, plant absorption etc.
It is good and bad to contrast above the whole bag of tricks, the chemical leaching method be to the soil of heavy metal pollution and mud the most directly, the most effective processing method.The composition of eluent is the core of elution method, and reason is that the basis of elution method promptly utilizes active ingredient and group in the eluent heavy metal in soil and the mud to be played effects such as desorb, complexing, makes it break away from former earth carrier.The eluent that adopts in scientific research now and the practice mainly is divided into four big types: inorganic eluent, artificial chelating agent, natural organic acids and biosurfactant.
For above four big types of traditional eluents, have under the prerequisite of wash-out heavy metal ability preferably, have all separately that service condition is harsh, cost is high, cause in the shortcoming such as secondary pollution one or more.
Summary of the invention
The objective of the invention is to overcome the deficiency that exists in the prior art, provide a kind of can the wash-out heavy metal, the eluent of heavy metal in the removal municipal sludge that environment and water body is not damaged again.
According to technical scheme provided by the invention; The eluent of heavy metal in the said removal municipal sludge; The component ratio is counted by weight, comprises following processing step: 50～500 parts PAPEs, 10～50 parts HPMA, 136～272 parts zinc chloride and 95000～99000 parts water are mixed stirring formation mixed liquor in mixing kettle, mixing speed is 120～180 rev/mins; Temperature is 30 ℃～40 ℃, and mixing time is 10～20 minutes.
Said HPMA is the HPMA of molecular weight 400～600.
When consumption≤30 of HPMA part, the pH value of mixed liquor is 4.5～6.
When consumption＞30 of HPMA part, pH value to 8～9 of transferring mixed liquor with sodium hydrate solid.
Eluent of the present invention can the wash-out heavy metal, can not damage environment and water body again, simultaneously can also enriching heavy metal, and effective ingredient consumption is little and the remarkable in economical benefits brought is with low cost; Heavy metal can pass through the subsequent treatment enrichment; Simple to operate, widely applicable.
The specific embodiment
Below in conjunction with specific embodiment the present invention is described further.
The PAPE that the PAPE that the present invention uses can adopt Shandong Taihe Water Treatment Co., Ltd. to produce; A plurality of polyoxyethylene groups have been introduced in the molecule of PAPE; Not only improved corrosion inhibition; Also improved the scale inhibition of calcium dirt and the dispersibility of silt, difficulty soluble salts such as the calcium carbonate in the water, calcium sulfate deposition has also been had good scale effect, steel have been had the cathodic protection effect.
The HPMA that the HPMA that the present invention uses can adopt Shandong Taihe Water Treatment Co., Ltd. to produce; HPMA is a kind of low-molecular-weight polyelectrolyte; General relative molecular weight is 400～800, and is nontoxic, soluble in water; Chemical stability and heat endurance are high, and decomposition temperature is more than 330 ℃.In water, partial monosomy can (COOH), can have complexing to metal ion by hydrolysis generation carboxyl.Consider space steric effect, the degree of polymerization should not be too high, and HPMA molecular weight used in the present invention is 400～600.
Eluent of the present invention; Adopt following prepared; Its component ratio is counted by weight: 50～500 parts PAPEs, 10～50 parts HPMA and 136～272 parts zinc chloride, 95000～99000 parts water are mixed stirring in mixing kettle; Mixing speed is 120～180 rev/mins, and temperature is 30 ℃～40 ℃, and mixing time is 10～20 minutes.
When consumption≤30 of HPMA part, mixed pH value of solution value is 4.5～6; When the consumption of HPMA is＞30 parts, transfer pH value to 8～9 of solution with sodium hydrate solid.
Embodiment one: a kind of eluent of removing heavy metal in the municipal sludge, and the component ratio is counted by weight, comprises following processing step:
50 parts PAPEs, 10 parts HPMA, 136 parts zinc chloride and 95000 parts water are mixed stirring in mixing kettle, mixing speed is 120 rev/mins, and temperature is 30 ℃ ℃, and mixing time is 20 minutes, and the pH value of mixing back solution is 4.5.
The use of said eluent: get mud sample 10 grams, plumbous effective content is 768mg/kg, and the cadmium effective content is 45mg/kg; Add 1mL, stir suction filtration after 1 hour, plumbous effective content is kept to 45mg/kg in the testing result show sample; The cadmium effective content is kept to 1mg/kg, and eluting rate all is higher than 90%.
Embodiment two: a kind of eluent of removing heavy metal in the municipal sludge, and the component ratio is counted by weight, comprises following processing step:
500 parts PAPEs, 50 parts HPMA, 272 parts zinc chloride and 99000 parts water are mixed stirring in mixing kettle; And transfer to mix the pH to 8.4 of back solution with sodium hydrate solid; Mixing speed is 180 rev/mins, and temperature is 40 ℃, and mixing time is 10 minutes.
The use of said eluent: in the 500L still, add the 50kg contaminated soil, plumbous effective content is 768mg/kg, and the cadmium effective content is 45mg/kg; Add the 200L eluent; Stirred 1 hour, and got mud appearance after the filtration and after drying, detect, the result shows that wherein plumbous effective content is 85ppm; The cadmium effective content is 3ppm, and eluting rate all is higher than 88%.
Embodiment three: a kind of eluent of removing heavy metal in the municipal sludge, and the component ratio is counted by weight, comprises following processing step:
250 parts PAPEs, 30 parts HPMA, 200 parts zinc chloride and 97000 parts water are mixed stirring in mixing kettle, mixing speed is 150 rev/mins, and temperature is 35 ℃, and mixing time is 15 minutes, and the pH value of mixing back solution is 6.
The use of said eluent: sampling detects in 50,000 cubes of sludge drying ponds; Wherein lead content is 689mg/kg; Cadmium content is 17mg/kg, and it is flocculant that sludge drying is selected polyacrylamide for use, and eluent and flocculant are squeezed into simultaneously; It is that 125mg/L, HPMA concentration are 15mg/L that sample analysis gets PAPE concentration, and zinc oxide concentration is 181mg/L.Flocculation the time is carried out removing of heavy metal, and solution flows to cistern from ventilating water pipe, the enrichment of carrying out heavy metal with separate.Mummification mud sample analysis, plumbous effective content is kept to 45ppm, and the cadmium effective content has detected less than, this kind mud appearance with regard to the heavy metal aspect, satisfies agricultural, woods far away and the aspect such as uses to use with, brick.
The recovery of said eluent: the eluent waste liquid to after the drip washing carries out follow-up focusing on, and records that the heavy metal total concentration is 2.34mmol/L in the eluent waste liquid, gets 1L eluent waste liquid and adds 183g vulcanized sodium, fully stir the back and filter, heavy metallic salt 330g.The waste liquid supernatant is reclaimed, and the eluent rate of recovery reaches 92%.
Claims (4)
1. eluent of removing heavy metal in the municipal sludge; It is characterized in that; The component ratio is counted by weight, comprises following processing step: 50～500 parts PAPEs, 10～50 parts HPMA, 136～272 parts zinc chloride and 95000～99000 parts water are mixed stirring formation mixed liquor in mixing kettle, mixing speed is 120～180 rev/mins; Temperature is 30 ℃～40 ℃, and mixing time is 10～20 minutes;
When consumption＞30 of HPMA part, pH value to 8～9 of transferring mixed liquor with sodium hydrate solid.
2. the eluent of heavy metal in the removal municipal sludge as claimed in claim 1 is characterized in that: said HPMA is the HPMA of molecular weight 400～600.
3. eluent of removing heavy metal in the municipal sludge; It is characterized in that; The component ratio is counted by weight, comprises following processing step: 50～500 parts PAPEs, 10～50 parts HPMA, 136～272 parts zinc chloride and 95000～99000 parts water are mixed stirring formation mixed liquor in mixing kettle, mixing speed is 120～180 rev/mins; Temperature is 30 ℃～40 ℃, and mixing time is 10～20 minutes;
When consumption≤30 of HPMA part, the pH value of mixed liquor is 4.5～6.
4. the eluent of heavy metal in the removal municipal sludge as claimed in claim 3 is characterized in that: said HPMA is the HPMA of molecular weight 400～600.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201010253412A CN101962254B (en) | 2010-08-10 | 2010-08-10 | Eluant for removing heavy metal from municipal sludge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010253412A CN101962254B (en) | 2010-08-10 | 2010-08-10 | Eluant for removing heavy metal from municipal sludge |
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| CN101962254A CN101962254A (en) | 2011-02-02 |
| CN101962254B true CN101962254B (en) | 2012-10-10 |
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| CN106001082A (en) * | 2016-07-26 | 2016-10-12 | 西南大学 | Application of polymalic acid in soil heavy metal pollution repair |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1962562A (en) * | 2006-12-05 | 2007-05-16 | 天津师范大学 | Spray washing method for removing heavy metal from domestic garbage compost |
| CN101224467A (en) * | 2008-01-04 | 2008-07-23 | 南京大学 | Leaching agent for repairing polycyclic aromatic hydrocarbon-cuprum compound polluted soil and method thereof |
| CN101293254A (en) * | 2008-05-27 | 2008-10-29 | 南京大学 | Method for eluting and renovating soil with heavy metal-organic matter combined pollution |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7029202B2 (en) * | 2002-07-22 | 2006-04-18 | Zhuang J Ming | Method for treating metal-contaminated water and soil |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1962562A (en) * | 2006-12-05 | 2007-05-16 | 天津师范大学 | Spray washing method for removing heavy metal from domestic garbage compost |
| CN101224467A (en) * | 2008-01-04 | 2008-07-23 | 南京大学 | Leaching agent for repairing polycyclic aromatic hydrocarbon-cuprum compound polluted soil and method thereof |
| CN101293254A (en) * | 2008-05-27 | 2008-10-29 | 南京大学 | Method for eluting and renovating soil with heavy metal-organic matter combined pollution |
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