CN104310638A - Method for pre-treating landfill leachate by coagulation-ozonation - Google Patents
Method for pre-treating landfill leachate by coagulation-ozonation Download PDFInfo
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- CN104310638A CN104310638A CN201410537134.7A CN201410537134A CN104310638A CN 104310638 A CN104310638 A CN 104310638A CN 201410537134 A CN201410537134 A CN 201410537134A CN 104310638 A CN104310638 A CN 104310638A
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Abstract
The invention relates to a method for pre-treating landfill leachate by coagulation-ozonation and belongs to the field of methods for wastewater treatment. The method for pre-treating landfill leachate by coagulation-ozonation comprises the following steps: after coarsely stirring the landfill leachate, adjusting the pH value to 7-8; adding a flocculant into a coagulative precipitation tank to treat in the stirring state; after settling, carrying out ozonation treatment on supernate in an ozonation pond, wherein effluent is pre-treated wastewater; and introducing the wastewater in a subsequent anaerobic-aerobic biological treatment process. According to the method for pre-treating landfill leachate by coagulation-ozonation provided by the invention, under the optimal treatment condition, the removal rate of COD (Chemical Oxygen Demand) of the landfill leachate reaches 70.6%, the BOD5 (Biochemical Oxygen Demand) removal rate reaches 75.4% and the chroma removing rate reaches 94%. The water quality has already been close to secondary standard of pollution control of municipal solid waste landfill of China so as to supply favorable conditions for a subsequent treatment process, thus the pre-treatment process is feasible.
Description
Technical field
The present invention relates to the method for a kind of coagulation-ozone oxidation pretreating waste percolate, belong to method of wastewater treatment field.
Background technology
Percolate is the flowing product of liquid under refuse landfill action of gravity, be mainly derived from the interior moisture of precipitation and rubbish itself, because the physical factor of liquid in flow process, chemical factor and biotic factor etc. all may affect leachate quality, so its character changes in a larger scope.In general, percolate pH value is between 4-9, and COD can from several thousand to tens thousand of, and BOD5 is from tens of to tens thousand of.
Percolate colourity is dark, organism, NH3-N, SS, chloride content are high, and harmful microorganism kind is many, quantity is large.Along with the increase of stacking the time limit, new refuse gradually becomes old rubbish, and Organic Pollutants of Landfill Leachate content declines to some extent, but ammonia-nitrogen content increases, and biodegradability reduces, and therefore intractability is very large.Leachate processing method mainly contains biological treatment and physical-chemical facture, and the basis of biochemical treatment adopts chemical flocculation treating refuse percolate, and COD clearance on average can reach 65%, and colourity and total tp removal rate and COD clearance are proportionate.Chemical oxidization method is used to (comprising ozone and hydrogen peroxide) advanced treatment of percolate, its reason can be directly simple organism of easily degrading by the oxidation operation that complicated difficult is degraded in many cases, inner free radical reaction can accelerated oxidation speed, in current Yue You100Zuo landfill percolate treatment plant of Germany, wherein 15 is advanced treatment process with chemical oxidation, but chemical oxidization method treating refuse percolate is also substantially at the experimental stage abroad, its shortcoming is that current consumption is large, cost is high.The percolate treating process majority of the existing city refuse landfill of China adopts anaerobism to add aerobic biological process for treating, and the problem of ubiquity operating performance difference.
For this reason, administering percolate must carry out effective pre-treatment, creates conditions with follow-up anaerobic-aerobic biological treatment.
Summary of the invention
The present invention aim to provide a kind for the treatment of effect good, run simple and cost low be applicable to the pretreated method of percolate.
The method of coagulation of the present invention-ozone oxidation pretreating waste percolate, comprises the following steps:
After percolate is carried out coarse filtration, regulate pH value to 7-8, flocculation agent process is added under whipped state in coagulative precipitation tank, after precipitation by supernatant liquor by carrying out ozone Oxidation Treatment in ozone oxidation pond, water outlet is the waste water that pre-treatment is good, introduces in follow-up anaerobic-aerobic biological treatment technique.
Preferably, flocculation agent of the present invention is polysilicate aluminum ferric sulfate class coagulating agent, and silicon, aluminium, iron level are than being 2:1:1, and consumption is 2mg/L.
Preferred, stirring velocity of the present invention is 100-200rpm, and the time is 10-20min, sedimentation time 40-60min.
Preferred further, the ozone concn of ozone oxidation of the present invention is 6g/L, and the treatment time is 1Omin.
Pretreatment process of the present invention, adopts polysilicate aluminum ferric sulfate coagulation and ozone oxidation two-stage tandem method treating refuse percolate.Polysilicate aluminum ferric sulfate coagulating agent of the present invention has good effect as pre-treatment medicaments treating refuse percolate, again after ozone Oxidation Treatment, its effluent quality is basic close to China's household refuse landfill sites Environmental capacity standard (GB16889 1997) secondary standard.
In pretreatment process of the present invention, show through a large amount of tests, part COD and colourity in percolate can be removed with polysilicate aluminum ferric sulfate coagulating agent, along with the increase of consuming amount of concrete, removal effect also strengthens thereupon, when consuming amount of concrete is 2mg/L, COD clearance reaches about 55%, and chroma removal rate is 75%.PH value 3.5-11 in a big way in, coagulating agent has good removal effect to COD of waste leachate, reach more than 5O%, when pH value is weakly alkaline (pH is about 8.O), COD removal effect is best, reach about 58%, and the measurement result of colourity is shown, along with pH value becomes alkalescence from acidity, color removal takes the lead in falling rear liter, when weakly acidic pH, chroma removal rate is comparatively stable, reach about 75%, in general, coagulating treatment is not good to chromaticity removing effect, in addition, in acid condition, coagulating produce floc particle fine uniform and sedimentation is slow, and in the basic conditions, floc particle size is large, settling velocity is fast, about 2Omin sedimentation is complete, for this reason, present method selects pH value to be 7-8.When ozone oxidation reaction is to 1Omin, COD value reduces always, and after 1Omin, COD value is almost unchanged, and chroma removal rate also almost reaches a stationary value, about about 94% simultaneously, therefore determines that the optimum oxidation time is 1Omin.
The method of coagulation of the present invention-ozone oxidation pretreating waste percolate, under optimal treatment condition, reach 7O.6% to the COD clearance of percolate, BOD5 clearance reaches 75.4%, and chroma removal rate is 94%.Its water quality is basic close to China's household refuse landfill sites Environmental capacity secondary standard, for subsequent treatment process creates favourable condition, illustrates that this pretreatment technology is practicable.
Embodiment
Embodiment one:
After percolate is carried out coarse filtration, regulate pH value to 7-8, be add polysilicate aluminum ferric sulfate class coagulating agent (silicon, aluminium, iron level are than being 2:1:1) under the whipped state of 100-200rpm to process 10-20min with speed in coagulative precipitation tank, precipitation 40-60min after by supernatant liquor by carrying out the ozone Oxidation Treatment 1Omin that ozone concn is 6g/L in ozone oxidation pond, water outlet is the waste water that pre-treatment is good, introduces in follow-up anaerobic-aerobic biological treatment technique.
Embodiment two: treatment effect
Be used in pretreatment process of the present invention, pre-treatment carried out to certain percolate, pretreating effect as shown in Table-1:
Table-1 treatment effect
From table-1, pretreatment process of the present invention, to the clearance of the COD of percolate more than 70.6%, the clearance of BOD5 is more than 75.4%, chroma removal rate is more than 94%, COD, BOD, the colourity of pretreated waste water all have larger removal, for subsequent disposal creates favourable condition.
Claims (4)
1. the method for coagulation-ozone oxidation pretreating waste percolate, comprises the following steps:
After percolate is carried out coarse filtration, regulate pH value to 7-8, flocculation agent process is added under whipped state in coagulative precipitation tank, after precipitation by supernatant liquor by carrying out ozone Oxidation Treatment in ozone oxidation pond, water outlet is the waste water that pre-treatment is good, introduces in follow-up anaerobic-aerobic biological treatment technique.
2. the method for coagulation-ozone oxidation pretreating waste percolate as claimed in claim 1, is characterized in that described flocculation agent is polysilicate aluminum ferric sulfate class coagulating agent, and silicon, aluminium, iron level are than being 2:1:1, and consumption is 2mg/L.
3. the method for coagulation-ozone oxidation pretreating waste percolate as claimed in claim 1, it is characterized in that described stirring velocity is 100-200rpm, the time is 10-20min, sedimentation time 40-60min.
4. the method for coagulation-ozone oxidation pretreating waste percolate as claimed in claim 1, it is characterized in that the ozone concn of described ozone oxidation is 6g/L, the treatment time is 1Omin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410537134.7A CN104310638A (en) | 2014-10-13 | 2014-10-13 | Method for pre-treating landfill leachate by coagulation-ozonation |
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| CN201410537134.7A CN104310638A (en) | 2014-10-13 | 2014-10-13 | Method for pre-treating landfill leachate by coagulation-ozonation |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105152406A (en) * | 2015-09-17 | 2015-12-16 | 华东交通大学 | Process for treating biochemical tail water landfill leachate by combining coagulation, oxidation and adsorption |
| CN108033591A (en) * | 2017-11-23 | 2018-05-15 | 南京大学 | A kind of coagulation-ozone oxidation combination carries out VB12The device and method of Wastewater Pretreatment |
| CN108751581A (en) * | 2018-05-25 | 2018-11-06 | 中节能工程技术研究院有限公司 | A kind for the treatment of process of landfill leachate bio-chemical effluent |
| CN110330147A (en) * | 2019-07-29 | 2019-10-15 | 上海电力大学 | Rapid treatment method for sludge landfill leachate |
| JP2019531895A (en) * | 2017-01-24 | 2019-11-07 | 福州大学 | Preparation method of thinning ceramic additive using waste leachate |
| CN112661352A (en) * | 2020-12-17 | 2021-04-16 | 玉禾田环境发展集团股份有限公司 | Kitchen wastewater and garbage leachate cooperative treatment system and method |
-
2014
- 2014-10-13 CN CN201410537134.7A patent/CN104310638A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105152406A (en) * | 2015-09-17 | 2015-12-16 | 华东交通大学 | Process for treating biochemical tail water landfill leachate by combining coagulation, oxidation and adsorption |
| JP2019531895A (en) * | 2017-01-24 | 2019-11-07 | 福州大学 | Preparation method of thinning ceramic additive using waste leachate |
| CN108033591A (en) * | 2017-11-23 | 2018-05-15 | 南京大学 | A kind of coagulation-ozone oxidation combination carries out VB12The device and method of Wastewater Pretreatment |
| CN108751581A (en) * | 2018-05-25 | 2018-11-06 | 中节能工程技术研究院有限公司 | A kind for the treatment of process of landfill leachate bio-chemical effluent |
| CN108751581B (en) * | 2018-05-25 | 2021-04-27 | 中节能工程技术研究院有限公司 | Treatment process of biochemical effluent of landfill leachate |
| CN110330147A (en) * | 2019-07-29 | 2019-10-15 | 上海电力大学 | Rapid treatment method for sludge landfill leachate |
| CN112661352A (en) * | 2020-12-17 | 2021-04-16 | 玉禾田环境发展集团股份有限公司 | Kitchen wastewater and garbage leachate cooperative treatment system and method |
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Application publication date: 20150128 |