CN103073089A - Method for removing ammonia nitrogen from landfill leachate by using P1 type fly ash molecular sieve - Google Patents

Method for removing ammonia nitrogen from landfill leachate by using P1 type fly ash molecular sieve Download PDF

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Publication number
CN103073089A
CN103073089A CN2013100455591A CN201310045559A CN103073089A CN 103073089 A CN103073089 A CN 103073089A CN 2013100455591 A CN2013100455591 A CN 2013100455591A CN 201310045559 A CN201310045559 A CN 201310045559A CN 103073089 A CN103073089 A CN 103073089A
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China
Prior art keywords
molecular sieve
type
ammonia nitrogen
percolate
flyash
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CN2013100455591A
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Chinese (zh)
Inventor
赵颖
席北斗
彭星
夏训峰
张列宇
李晓光
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中国环境科学研究院
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Priority to CN2013100455591A priority Critical patent/CN103073089A/en
Publication of CN103073089A publication Critical patent/CN103073089A/en

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Abstract

The invention discloses a method for removing ammonia nitrogen from landfill leachate by using a P1 type fly ash molecular sieve. In the method, the P1 type fly ash molecular sieve is added into the landfill leachate for adsorbing at the normal temperature. Effluent ammonia nitrogen treated with the method can reach a national class I discharge standard; the method has the advantages of simple process, low cost and easy control; and meanwhile, recycling of industrial solid waste, i.e., fly ash is realized.

Description

A kind of method of utilizing P1 type flyash molecular sieve to remove ammonia nitrogen in the percolate
Technical field
The invention belongs to the environment protection water treatment field, relate to particularly the method that ammonia nitrogen is processed in the percolate, more specifically relate to a kind of P1 of utilization type flyash molecular sieve to the ammonia nitrogen processing method in the percolate.
Background technology
Percolate refers to derive from the moisture that rubbish itself contains in the refuse landfill, the sleet water that enters landfill yard and other moisture, the saturation moisture capacity of deduction rubbish, overburden layer, and a kind of high-concentration waste water that forms through waste layer and overburden layer.The character of percolate changes along with the difference of the working time of landfill yard, and this mainly is that stabilization procedures by rubbish in the landfill yard determines.The stabilization procedures of refuse landfill is divided into double teacher usually, i.e. initialize adjusting stage, transitory stage, souring stage, methane fermentation stage and stage of maturity.The processing of percolated liquid in city refuse landfill is unusual stubborn problem in Landfill Site Design, the operation and management always.Percolate be liquid at the product of landfill yard gravity flowage, be mainly derived from the interior moisture of precipitation and rubbish itself.Because liquid has many factors may have influence on the character of percolate in flow process, comprises physical factor, chemical factor and biotic factor etc., so the character of percolate changes in a sizable scope.Leachate quality is very complicated, and COD and BOD concentration are high; Organic pollutant category is many; 10 many kinds of metal ions are arranged; Ammonia-nitrogen content is high, and C/N is out of proportion, and phosphoric lacks.After landfill age surpassing 3~5 years, the organism of percolate readily biodegradable is called mature leachate than the obvious decline of regular meeting, and wherein BOD/COD ratio is generally between the 0.1-0.2, and ammonia nitrogen concentration increases, and the processing target of this moment is to remove ammonia nitrogen as main.
Based on above characteristics, for general biological treatment, there is certain difficulty, and absorption method is one of denitrification treatment technology of commonly using, sorbent material mainly is as main take gac at present, but the production cost of gac is higher, and the ratio that therefore accounts in percolate ammonia nitrogen in high density treatment process only is 1%.By the end of so far, by consulting domestic and foreign literature and patent retrieval, do not find the report that adopts the flyash synthesis of molecular sieve to come the ammonia nitrogen in high density in the treating refuse percolate.
Summary of the invention
The object of the present invention is to provide a kind of P1 of utilization type flyash molecular sieve to remove the method for ammonia nitrogen in the percolate, reach the treatment of wastes with processes of wastes against one another, solve the purpose of environmental pollution.
For achieving the above object, utilizing P1 type flyash molecular sieve to remove the method for ammonia nitrogen in the percolate, is P1 type flyash molecular sieve to be added in the percolate go, and adsorbs at normal temperatures.
The described method of utilizing P1 type flyash molecular sieve to remove ammonia nitrogen in the percolate, wherein, the dosage of P1 type flyash molecular sieve is 20-30g/L.
Wherein, P1 type flyash molecular sieve obtains by following method:
(1) aqueous solution with flyash and alkali is made into mixed solution, and heated and stirred is reacted;
(2) interpolation aluminium source or silicon source adjustment silica alumina ratio reacts in the reacted mixed solution of step (1);
(3) will carry out solid-liquid separation after the reacted mixed solution cooling down of step (2);
(4) after the solid water after the separation cleans, add CaCl 2Or FeCl 2Solution, obtaining cation type is Ca or Fe type zeolite;
(5) carry out solid-liquid separation after the mixed solution cooling down with step (4);
(6) the solid water after the separation cleans, and obtains Powdered P1 type flyash molecular sieve after the drying.
The described method of utilizing P1 type flyash molecular sieve to remove ammonia nitrogen in the percolate, wherein, the aqueous solution of the alkali of step (1) is aqueous sodium hydroxide solution, flyash: water+NaOH=4-5: 2, wherein the NaOH mass concentration is 10-20%.
The described method of utilizing P1 type flyash molecular sieve to remove ammonia nitrogen in the percolate, wherein, the temperature of heated and stirred is 60-80 ℃ in the step (1).
Compared with prior art, the present invention utilizes the synthetic P1 type flyash molecular sieve of flyash to be directly used in the processing of percolate middle and high concentration ammonia nitrogen, adopt lower running cost and investment cost, make ammonia nitrogen qualified discharge in the percolate, reach the purpose of environmental contamination reduction, realize simultaneously the recycling of the flyash of solid waste.Working method of the present invention is simple, less investment; The characteristics such as P1 type flyash molecular sieve low production cost that the present invention adopts.Come with the flyash synthesis of molecular sieve outside the problem of ammonia nitrogen in the treating refuse percolate, also the use for solid waste coal ash provides a kind of brand-new approach, realizes changing waste into resources.
Description of drawings
Fig. 1 is the scanning electron microscope (SEM) photograph of the synthetic P1 flyash molecular sieve of flyash of the present invention.
Fig. 2 is X-ray diffraction (XRD) figure of the synthetic P1 type flyash molecular sieve of flyash of the present invention.
Embodiment
The method of utilizing the synthetic P1 type flyash molecular sieve of flyash to remove ammonia nitrogen in the percolate provided by the invention is molecular sieve to be added in the percolate go, and adsorbs at normal temperatures, and better dosage is 10-20g/L.
Synthesize the method that P1 type molecular sieve comes the ammonia nitrogen in high density in the treating refuse percolate below in conjunction with the present invention with flyash, the specific embodiment of the present invention is described.
P1 type flyash molecular sieve in following examples is to obtain by following method:
1) flyash is crossed 100 orders-200 mesh sieve.
2) aqueous solution with flyash and alkali (sodium hydroxide) is made into mixed solution, in 60-80 ℃ of stirring, and in 110-130 ℃ of reaction 1-2h; Solid waste: water+NaOH mass ratio is 4-5: 2, and wherein the NaOH mass concentration is 10-20%;
3) in the reacted mixed solution of step 2, add aluminium source or silicon source adjustment silica alumina ratio, in 110-130 ℃ of reaction;
4) after the reacted mixed solution cooling down of step 3, carry out solid-liquid separation;
5) the solid water after the separation cleans, and adds CaCl 2Or FeCl 2Solution, the preparation cation type is Ca or Fe type zeolite;
6) etc. carry out solid-liquid separation after the mixed solution cooling down of step 5, the solid that obtains cleans, obtain Powdered P type flyash molecular sieve after dry, granulation, dryly obtains granular P1 type flyash molecular sieve.
The scanning electron microscope (SEM) photograph of the P1 type flyash molecular sieve figure of the present invention preparation as shown in Figure 1, Fig. 2 is X-ray diffraction (XRD) figure of P1 type flyash molecular sieve.
Embodiment 1
P1 type flyash molecular sieve is added in the percolate goes, dosage is 12g/l, adsorb for some time at normal temperatures after, the clearance of ammonia nitrogen reaches 85.2%.
Embodiment 2
Just P1 type flyash molecular sieve is added in the percolate and goes, and dosage is 15g/l, adsorb for some time at normal temperatures after, the clearance of ammonia nitrogen reaches 91.1%.
Embodiment 3
P1 type flyash molecular sieve is added in the percolate goes, dosage is 10g/l, adsorb for some time at normal temperatures after, the clearance of ammonia nitrogen reaches 82.2%.

Claims (5)

1. a method of utilizing P1 type flyash molecular sieve to remove ammonia nitrogen in the percolate is P1 type flyash molecular sieve to be added in the percolate go, and adsorbs at normal temperatures.
2. the described method of utilizing P1 type flyash molecular sieve to remove ammonia nitrogen in the percolate according to claim 1, wherein, the dosage of P1 type flyash molecular sieve is 20-30g/L.
3. the described method of utilizing P1 type flyash molecular sieve to remove ammonia nitrogen in the percolate according to claim 1, wherein, P1 type flyash molecular sieve obtains by following method:
(1) aqueous solution with flyash and alkali is made into mixed solution, and heated and stirred is reacted;
(2) interpolation aluminium source or silicon source adjustment silica alumina ratio reacts in the reacted mixed solution of step (1);
(3) will carry out solid-liquid separation after the reacted mixed solution cooling down of step (2);
(4) after the solid water after the separation cleans, add CaC1 2Or FeC1 2Solution, obtaining cation type is Ca or Fe type zeolite;
(5) carry out solid-liquid separation after the mixed solution cooling down with step (4);
(6) the solid water after the separation cleans, and obtains P1 type flyash molecular sieve after the drying.
4. the described method of utilizing P1 type flyash molecular sieve to remove ammonia nitrogen in the percolate according to claim 3, wherein, the aqueous solution of the alkali of step (1) is aqueous sodium hydroxide solution, flyash: water+NaOH=4-5: 2, and wherein the NaOH mass concentration is 10-20%.
5. the described method of utilizing P1 type flyash molecular sieve to remove ammonia nitrogen in the percolate according to claim 3, wherein, the temperature of heated and stirred is 60-80 ℃ in the step (1).
CN2013100455591A 2013-02-05 2013-02-05 Method for removing ammonia nitrogen from landfill leachate by using P1 type fly ash molecular sieve CN103073089A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005279442A (en) * 2004-03-29 2005-10-13 Japan Science & Technology Agency Method of treating livestock waste
CN101486471A (en) * 2009-02-27 2009-07-22 西安建筑科技大学 Method for preparing zeolite molecular sieves having different Si/Al ratios from fly ash
CN102091593A (en) * 2010-12-07 2011-06-15 浙江大学 Preparation method of functionalized fly ash and zeolite composite particles
US20110203998A1 (en) * 2007-08-21 2011-08-25 Nanjing University Method for removing ammonia nitrogen in coking wastewater

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005279442A (en) * 2004-03-29 2005-10-13 Japan Science & Technology Agency Method of treating livestock waste
US20110203998A1 (en) * 2007-08-21 2011-08-25 Nanjing University Method for removing ammonia nitrogen in coking wastewater
CN101486471A (en) * 2009-02-27 2009-07-22 西安建筑科技大学 Method for preparing zeolite molecular sieves having different Si/Al ratios from fly ash
CN102091593A (en) * 2010-12-07 2011-06-15 浙江大学 Preparation method of functionalized fly ash and zeolite composite particles

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Application publication date: 20130501