CN104986906A - Method for treating dangerous and waste leachate - Google Patents
Method for treating dangerous and waste leachate Download PDFInfo
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- CN104986906A CN104986906A CN201510313144.7A CN201510313144A CN104986906A CN 104986906 A CN104986906 A CN 104986906A CN 201510313144 A CN201510313144 A CN 201510313144A CN 104986906 A CN104986906 A CN 104986906A
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Abstract
The invention discloses a method for treating dangerous and waste leachate. The method comprises the steps that firstly, particulate matter, part of organic matter and part of heavy metal in the leachate are removed through the method of flocculation after alkali is adjusted so that the subsequent treating pressure can be lowered, and the treating cost can be reduced; secondly, high-concentration ammonia nitrogen in the leachate is desorbed through the technology of air stripping under certain conditions; thirdly, reduction is carried out on the leachate through alkaline evaporation and concentration. The desorbed ammonia gas is discharged into acid adsorption liquid to be absorbed and recycled, condensation liquid is directly discharged out of a pipe connecting opening of a waste water treating plant, discharging with the standard met is achieved, condensation liquid and flocculation sludge are solidified and then dumped again, and finally safe treatment is achieved. By means of the technology of the method, the reduction, the hazard-free treatment and the reclamation of the dangerous and waste leachate are achieved to the maximum degree, losses of heavy metal ions, high-toxicity organic matter and salt are not caused in the process, secondary pollution is not caused, load impact on subsequent treatment is not caused, and the method is a good method for treating the dangerous and waste leachate.
Description
Technical field
The present invention relates to a kind of method of wastewater treatment, especially a kind for the treatment of process of useless percolate of endangering, belongs to field of environmental technology.
Background technology
Hazardous wastes percolate be in danger waste landfill site due to the extruding of landfill heap body, rainwater leaching is drenched or groundwater erosion produces sewage, wherein containing a large amount of pollution substance, potential threat is caused to environment.
Conventional leachate processing method comprises: biochemical treatment, chemical oxidation treatment, recharge process, film process and evaporation concentration process.Often containing all kinds of organic and inorganic pollutant from industries such as plating, agricultural chemicals, petrochemical industry and fine chemistry industries in the Hazardous wastes of danger waste landfill site landfill, as: ammonia nitrogen, heavy metal ion, high malicious organism, salinity and prussiate etc.Therefore percolate biodegradability extreme difference, is difficult to adopt method that is biochemical and that recharge to process; Chemical oxidization method process needs to consume a large amount of chemical reagent, and the hydrogen peroxide as conventional in Fenton process is expensive, and processing cost is high; Membrane processing method is good to consumer waste infiltration liquid treatment effect, but more, the more complicated danger of heavy metal ion is given up, percolate cannot be suitable for; Often containing ammonia nitrogen in the phlegma that conventional evaporation concentration method obtains, ability qualified discharge after the further process of needs, this has increased the weight of cost of disposal undoubtedly greatly.
Chinese patent CN103880245A (application number: 201410103203.3) describe a kind of method for treating garbage percolation liquid, the method is reclaimed ammonia nitrogen in percolate by high-efficiency dissolued-air air supporting and molecular sieve, improve the biodegradability energy of percolate simultaneously, then by biochemical method, percolate is processed.The method heavy metal ion, the consumer waste infiltration liquid that salinity is not high are more applicable; Chinese patent CN102040309A (application number: 200910236073.X) describes the treatment combination technique that a kind of municipal waste leachate membrane goes out concentrated liquid, and this technique includes the unit such as coagulating sedimentation, photoelectricity oxidation and oxidation-adsorption filtration.After coagulation operation, adopt the techniques such as photoelectricity oxidation and oxidation-adsorption to remove COD, heavy metal ion, respond well; Chinese patent CN103253836A (application number: 201310226537.5) set forth a kind of percolate deep purifying treatment unit and method, by membrane bioreactor to remove organism in described percolate and solid particulate, then coagulation is carried out to percolate carry out reverse osmosis again and remove ion in this water outlet.Above three invention heavy metal, salinity isoconcentration are higher, and the danger of the biodegradability extreme difference percolate that gives up is difficult to tell on.
Summary of the invention
For the shortcoming of above-mentioned prior art, the invention provides danger that a kind for the treatment of effect better, do not produce secondary pollution and to give up the treatment process of percolate.
For achieving the above object, the technical solution used in the present invention is: a kind for the treatment of process of useless percolate of endangering, specifically comprises the following steps:
1. in the useless percolate of danger, add alkaline matter, stir, make pH value be 10 ~ 11;
2. in the material after step 1. middle alkali tune, add coagulating agent and flocculation agent, stir, make percolate produce flocculent precipitate, and layering, form mud mixture;
3. with mud and water separating equipment, mud-water separation is carried out to the mud mixture in 2., collect supernatant liquid and mud;
4. under normal temperature condition, when pH value is about 10 to the capable stripping of liquid in 3., until near below the 30mg/L of ammonia nitrogen value in liquid; With absorption liquid, stripping tail gas is reclaimed simultaneously;
5., under pH value is about 11 conditions, the material complete to 4. middle stripping carries out evaporation concentration, phlegma in line Sewage Plant adapter mouth;
6. to percolate evaporation concentration and 3. in sludge liquid be cured, cured body returns landfill yard landfill.
Preferably, described alkaline matter is lime powder.
Preferably, described coagulating agent is aluminium chlorohydroxide (PAC).
Preferably, described flocculation agent is polyacrylamide (PAM).
Preferably, described step 1. in the danger that uses give up percolate for the percolate of waste landfill site of endangering, wherein except containing except a large amount of ammonia nitrogen also containing more than a large amount of heavy metal ion, salinity, prussiate and height poison organism two class or two classes, and content is more than associated emissions limit value in GB8978-1996 " integrated wastewater discharge standard " grade III Standard and CJ 3082-1999 " sewage enters municipal sewage system water quality standard ", biodegradability extreme difference; The Hazardous wastes of landfill comprises industrial residue from industries such as petrochemical industry, plating, fine chemistry industry, incineration firing, pharmacy and waste material.
Preferably, described step 2. in the mass concentration of aluminium chlorohydroxide be: 5-10%, aluminium chlorohydroxide adds coagulating agent add-on in rear percolate and is: 30-50mg/L; The mass concentration of polyacrylamide is 0.1-0.5%, and polyacrylamide adds coagulating agent add-on in rear percolate and is: 1-10mg/L; Concrete needs test is determined.
Preferably, described step 3. in mud and water separating equipment can be plate-and-frame filter press, belt filter press, settling tank, run-off etc.
Preferably, described step 4. in the stripping equipment that adopts of stripping be the stripping tower, stripping pond etc. of device for absorbing tail gas.
Preferably, described step 4. in absorption liquid be mineral acid absorption liquid.
Preferably, described step 5. in evaporation concentration adopt evaporation equipment be all kinds of vaporizer; Evaporation concentration is to the 1/3-1/10 of original volume.
Preferably, described step 5. in phlegma meet the requirement of associated emissions limit value in GB8978-1996 " integrated wastewater discharge standard " grade III Standard and CJ 3082-1999 " sewage enters municipal sewage system water quality standard ".
Table 1 associated emissions limit value
Preferably, described step 6. in percolate evaporation concentration and 3. in the method that is cured of sludge liquid can adopt in Chinese patent CN104496139A (application number: CN201510000052.3), CN104475431A (application number: CN201510000055.7) and CN 104070052A (application number: CN201410296106.0) and have disclosed method.
The present invention has positive effect:
(1) the present invention is when processing the useless percolate of danger, ammonia nitrogen is separated from percolate, organism, heavy metal and salinity to be retained in concentrated solution and final solidify & bury had both made discharge of wastewater index reach requirement, also make each type organic not produce secondary pollution, environmental benefit is good.
(2) the present invention adopts the method for flocculation to carry out pre-treatment to percolate, reduces the concentration of heavy metal ion, organism and suspended particulate.
(3) first the present invention carries out stripping to the useless percolate of danger before evaporation concentration under pH value is 10-11 condition, which ensure that the non-volatile or few volatilization of organism and ammonia farthest removes, organism in tail gas is reduced to greatest extent and ammonia nitrogen qualified discharge in phlegma; When pH value is 11, evaporation concentration is carried out to percolate, it reduce organic content in phlegma.
(4) the present invention reclaims tail gas ammonia when carrying out stripping to the useless percolate of danger, has certain economic benefit.
(5) the inventive method is applicable to mostly endangering the process of waste landfill site percolate, and promoted extension is wide.
Present invention process achieves the minimizing of the useless percolate of danger, innoxious and resource utilization to greatest extent, process does not cause the loss of heavy metal ion, high malicious organism and salinity, not producing secondary pollution, do not cause load impact to subsequent disposal, is the good method of the useless percolate process of danger.
Accompanying drawing illustrates:
Fig. 1 is process flow sheet of the present invention.
Embodiment:
As shown in Figure 1: a kind for the treatment of process of useless percolate of endangering, specifically comprises the following steps:
1. in the useless percolate of danger, add lime, stir, make pH value be 10 ~ 11;
2. in the material after step 1. middle alkali tune, add coagulating agent PAC and flocculation agent PAM, stir, make percolate produce flocculent precipitate, and layering;
3. with mud and water separating equipment, mud-water separation is carried out to mud mixture in 2., collect supernatant liquid and mud;
4., under normal temperature condition, when pH value is about 10, stripping is carried out, until near below the 30mg/L of ammonia nitrogen value in percolate to percolate in 3.; With absorption liquid, stripping tail gas is reclaimed simultaneously.
5., under pH value is about 11 conditions, the material complete to 4. middle stripping carries out evaporation concentration, phlegma in line Sewage Plant adapter mouth;
6. to percolate evaporation concentration and 3. in sludge liquid be cured, cured body returns landfill yard landfill.
Embodiment 1
The present embodiment process be certain danger waste landfill site percolate, the useless mainly surface of landfill danger is containing the electroplating sludge of a large amount of grease, wherein pH is 7.86, COD concentration is 21983mg/L, ammonia nitrogen concentration is 2341mg/L, in heavy metal index, copper content is 342mg/L, and nickel content is 152mg/L, and other indexs reach the requirement of associated emissions limit value in GB8978-1996 " integrated wastewater discharge standard " grade III Standard and CJ 3082-1999 " sewage enters municipal sewage system water quality standard ".
The danger of the present embodiment leachate processing method that gives up comprises the following steps:
1. in 2L percolate, add 40g lime powder, stir, pH value is 10.85;
2. in the material after step 1. middle alkali tune, add the coagulating agent PAC2ml that concentration is 5%, PAC adds coagulating agent add-on in rear percolate and is: 50mg/L; Add the flocculation agent PAM 4ml of concentration 0.5%, PAM adds coagulating agent add-on in rear percolate and is: 10mg/L, stirs, and after leaving standstill 15min, percolate layering is good;
3. by Büchner funnel simulation water extracter, mud-water separation is carried out to mud mixture in 2., collect supernatant liquid and mud;
4., under normal temperature condition, adopt pneumatic pump and aeration head and self-control stripping bottle simulation stripping pond to carry out stripping experiment, control ph is about 10, and when stripping time is 18min, in percolate, ammonia nitrogen value is 23mg/L; Be that the sulfuric acid of 1mol/L reclaims stripping tail gas as absorption liquid by 50ml concentration, until saturated after re-absorption effect, in absorption liquid, COD concentration is 136mg/L, cleaner simultaneously.Using absorption liquid as landfill yard vegetation ammonia Fertilizer application, respond well.
5., when pH value is 11, the material adopting electric furnace and large flask to simulate vaporizer complete to 4. middle stripping carries out evaporation concentration, analyzes index of correlation content in phlegma; Experiment finds when concentrated leachate volume is 415ml, a large amount of solid sediment is all there is in bottle, to be heated at the bottom of causing bottle inequality, " bumping " phenomenon occurred, although now appoint in bottle and have a small amount of liquid, but cannot carry out evaporation concentration operation, now concentrated solution volume is 21% of percolate, and evaporation time is about 70min.
Analysis phlegma finds, its pH value is 10.8, and ammonia-nitrogen content is 5mg/L, COD content is 214mg/L, and heavy metal does not detect, and all meets emission request, can directly discharge.
6. get evaporation concentration liquid and flocculation sludge 0.5kg altogether, add sodium sulfide solution 20ml, stir; Add white lime powder 100g again, Keep agitation is even; Then slowly add gesso 450g, be stirred to material shape glomeration particulate matter; Above-mentioned material seasoning is solidified 1 day, gets bisphenol A-type (trade mark E-44) epoxy resin 40mL and mix with globular material, make the even coated material of epoxy resin; Add epoxy curing agent 10mL subsequently, now material becomes sticky immediately; Material is put in the cement specimen mold of length of side 0.15m, after the demoulding, cured body is placed 2-3 angel particle outer layer ring epoxy resins completion of cure.
Analyze cured body Leaching, find to meet the requirements completely, cured body can direct landfill.
Embodiment 2
The present embodiment process be another danger waste landfill site percolate, landfill danger useless mainly arsenic slag, flying ash and chemical industry rectification residue, wherein pH is 8,76, COD concentration is 11452mg/L, and ammonia nitrogen concentration is 1385mg/L, and in heavy metal index, arsenic content is 12mg/L, cadmium content is 3mg/L, and other indexs reach the requirement of associated emissions limit value in GB8978-1996 " integrated wastewater discharge standard " grade III Standard and CJ 3082-1999 " sewage enters municipal sewage system water quality standard ".
The danger of the present embodiment leachate processing method that gives up is identical with embodiment 1, and difference is:
1. step adds lime powder 20g, and after stirring, pH value is 10.54;
Step is 4. when stripping time is 14min, and in percolate, ammonia nitrogen value is 18mg/L; In absorption liquid, COD concentration is 152mg/L.
5. step stops concentrated when concentrated leachate volume is 500ml, now concentrated solution volume is 27% of percolate, and evaporation time is about 60min.
Analysis phlegma finds, its pH value is 10.5, and ammonia-nitrogen content is 3mg/L, COD content is 265mg/L, and heavy metal does not detect, and all meets emission request, can directly discharge.
Carry out Leaching to the cured body of mud and evaporation concentration liquid to analyze, find to meet the requirements completely, cured body can direct landfill.
Embodiment 3
The present embodiment process be waste landfill site another batch of percolate of endangering in embodiment 1, landfill danger useless mainly electroplating sludge, agricultural chemicals refuse, phosphatization slag etc., wherein pH is 9.41, COD concentration is 13651mg/L, ammonia nitrogen concentration is 1689mg/L, in heavy metal index, Zn content is 113mg/L, copper content is 94mg/L, and other indexs reach the requirement of associated emissions limit value in GB8978-1996 " integrated wastewater discharge standard " grade III Standard and CJ 3082-1999 " sewage enters municipal sewage system water quality standard ".
The danger of the present embodiment leachate processing method that gives up is identical with embodiment 1, and difference is:
1. step adds lime powder 10g, and after stirring, pH value is 9.93;
Step is 4. when stripping time is 15min, and in percolate, ammonia nitrogen value is 22mg/L; In absorption liquid, COD concentration is 191mg/L.
5. step stops concentrated when concentrated leachate volume is 360ml, now concentrated solution volume is 18% of percolate, and evaporation time is about 85min.
Analysis phlegma finds, its pH value is 10.6, and ammonia-nitrogen content is 4mg/L, COD content is 315mg/L, and heavy metal does not detect, and all meets emission request, can directly discharge.
Carry out Leaching to the cured body of mud and evaporation concentration liquid to analyze, find to meet the requirements completely, cured body can direct landfill.
Claims (10)
1. a treatment process for the useless percolate of danger, is characterized in that, specifically comprise the following steps:
1. in the useless percolate of danger, add alkaline matter, stir, make pH value be 10 ~ 11;
2. in the material after step 1. middle alkali tune, add coagulating agent and flocculation agent, stir, make percolate produce flocculent precipitate, and layering, form mud mixture;
3. with mud and water separating equipment, mud-water separation is carried out to the mud mixture in 2., collect supernatant liquid and mud;
4. under normal temperature condition, when pH value is about 10 to the capable stripping of liquid in 3., until near below the 30mg/L of ammonia nitrogen value in liquid; With absorption liquid, stripping tail gas is reclaimed simultaneously;
5., under pH value is about 11 conditions, the material complete to 4. middle stripping carries out evaporation concentration, phlegma in line Sewage Plant adapter mouth;
6. to percolate evaporation concentration and 3. in sludge liquid be cured, cured body returns landfill yard landfill.
2. the treatment process of a kind of useless percolate of endangering as claimed in claim 1, it is characterized in that, described alkaline matter is lime powder.
3. the treatment process of a kind of useless percolate of endangering as claimed in claim 1, it is characterized in that, described coagulating agent is aluminium chlorohydroxide; Described flocculation agent is polyacrylamide.
4. the treatment process of a kind of useless percolate of endangering as claimed in claim 3, is characterized in that, described step 2. in the mass concentration of aluminium chlorohydroxide be: 5-10%, aluminium chlorohydroxide adds coagulating agent add-on in rear percolate and is: 30-50mg/L; The mass concentration of polyacrylamide is 0.1-0.5%, and polyacrylamide adds coagulating agent add-on in rear percolate and is: 1-10mg/L.
5. the treatment process of a kind of useless percolate of endangering as claimed in claim 1, it is characterized in that, described step 1. in the danger that uses give up percolate for the percolate of waste landfill site of endangering, wherein except containing except a large amount of ammonia nitrogen also containing more than a large amount of heavy metal ion, salinity, prussiate and height poison organism two class or two classes, and content is more than associated emissions limit value in GB8978-1996 " integrated wastewater discharge standard " grade III Standard and CJ 3082-1999 " sewage enters municipal sewage system water quality standard ".
6. the treatment process of a kind of useless percolate of endangering as claimed in claim 1, is characterized in that, described step 3. middle mud and water separating equipment is plate-and-frame filter press, belt filter press, settling tank or run-off.
7. the treatment process of a kind of useless percolate of endangering as claimed in claim 1, is characterized in that, described step 4. in the stripping equipment that adopts of stripping be stripping tower or the stripping pond of device for absorbing tail gas.
8. the treatment process of a kind of useless percolate of endangering as claimed in claim 1, is characterized in that, described step 4. in absorption liquid be mineral acid absorption liquid.
9. the treatment process of a kind of useless percolate of endangering as claimed in claim 1, is characterized in that, described step 5. in evaporation concentration adopt evaporation equipment be all kinds of vaporizer; Evaporation concentration is to the 1/3-1/10 of original volume.
10. the treatment process of a kind of useless percolate of endangering as claimed in claim 1, it is characterized in that, described step 5. in phlegma meet the requirement of associated emissions limit value in GB8978-1996 " integrated wastewater discharge standard " grade III Standard and CJ3082-1999 " sewage enters municipal sewage system water quality standard ".
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Cited By (5)
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| CN105967395A (en) * | 2016-06-24 | 2016-09-28 | 浦北县科学技术开发中心 | Method for treating garbage leachate |
| CN110316881A (en) * | 2019-05-13 | 2019-10-11 | 宇恒(南京)环保装备科技有限公司 | A kind of sewage air lift combined treatment process |
| CN110759571A (en) * | 2019-10-31 | 2020-02-07 | 广东闻扬环境科技有限公司 | Fly ash leachate treatment system and treatment method |
| CN111285554A (en) * | 2020-03-21 | 2020-06-16 | 杭州师范大学钱江学院 | Method for deep purification treatment of landfill leachate |
| CN113511771A (en) * | 2021-09-14 | 2021-10-19 | 湖南天为环保科技有限公司 | High-concentration landfill leachate membrane concentrated solution treatment process and application thereof |
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| CN113511771B (en) * | 2021-09-14 | 2021-12-10 | 湖南天为环保科技有限公司 | High-concentration landfill leachate membrane concentrated solution treatment process and application thereof |
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