CN101891316A - Process for treating nitrogen-containing wastewater by ion exchange and reclaiming ammonium nitrate - Google Patents
Process for treating nitrogen-containing wastewater by ion exchange and reclaiming ammonium nitrate Download PDFInfo
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Abstract
The invention discloses a process for treating nitrogen-containing wastewater by ion exchange and reclaiming ammonium nitrate, and belongs to the technical field of environmental protection and wastewater treatment. The process is characterized in that: a strong acid cation exchanger and a weak alkali anion exchanger are connected in series to realize denitrification of the nitrogen-containing wastewater of a nitrogen fertilizer plant; the process is used for treating the high-concentration ammonia nitrogen and median-concentration nitrate nitrogen containing wastewater of the nitrogen fertilizer plant; strong acid cation exchange resin and weak alkali anion exchange resin are regenerated by adopting nitric acid and aqueous ammonia respectively; and the regenerated waste liquid ammonium nitrate is evaporated and concentrated to reclaim the ammonium nitrate. Compared with the traditional wastewater denitrification method, the process can remove ammonia nitrogen and nitrate nitrogen from the wastewater at the same time, reclaim the ammonium nitrate and recycle production water, does not produce secondary pollution, reclaims products from the pollutants, has obvious environmental benefit and economic benefit, and is a new path for treating the high-concentration ammonia nitrogen and median-concentration nitrate nitrogen containing wastewater of the nitrogen fertilizer plant.
Description
Technical field
A kind for the treatment of nitrogen-containing wastewater by ion exchange of the present invention also reclaims the technology of ammonium nitrate, belongs to environment protection and technical field of waste water processing.Specifically, be to adopt strongly acidic cation exchanger-weakly-basic anion interchanger to connect to realize the processing of nitrogen fertilizer plant's nitrogenous effluent, finish the removal of ammonia nitrogen and nitrate nitrogen in nitrogen fertilizer plant's nitrogenous effluent respectively with strongly acidic cation exchanger and weakly-basic anion interchanger, storng-acid cation exchange resin and weak base anion-exchange resin after exchange is handled adopt nitric acid and ammoniacal liquor to regenerate respectively, regeneration waste liquid is an ammonium nitrate solution, can reclaim ammonium nitrate through carrying after dense.
Background technology
Wastewater from nitrogenous fertilizer industry derives from phlegma, washing water and the system leak water etc. in nitrogen fertilizer plant's production process.Waste water composition complexity contains the ammonia nitrogen of high density.In addition, in do the phlegma that processing and manufacturing process that raw material carries out chemical fertilizer such as urea, ammonium nitrate produces with synthetic ammonia, also contain in the nitrate nitrogen of concentration.Nitrate reduction in the tap water forms nitrite ion, and it can make the oxidation of divalent in the denatured hemoglobin molecule become ferric iron.The denatured hemoglobin non-reversibility ground that forms lacks NADH-denatured hemoglobin enzyme system in conjunction with oxygen in the discontented trimestral infants, therefore more easily suffer from methemoglobinemia, and nitrate also can be transformed into " three cause " material nitrosamine in human body.The method of nitrogen fertilizer plant's nitrogenous effluent denitrogenation mainly contains at present: methods such as chemical precipitation method, ammonia stripping, stripping and biological denitrificaion.But the above two can only remove the ammonia nitrogen in the waste water, can not remove nitrate nitrogen.The biological denitrificaion method comprises biological nitration and denitrification, though can remove nitrate nitrogen, is not suitable for handling the wastewater from nitrogenous fertilizer industry of ammonia nitrogen in high density.Major cause is: wastewater from nitrogenous fertilizer industry contains ammonia nitrogen in high density, suppresses the growth of nitrifier, is difficult to ammonia nitrogen is oxidized to nitrite and nitrate under aerobic condition.In addition, carbonaceous organic material seldom is difficult to provide the biological denitrification process required carbon source in the wastewater from nitrogenous fertilizer industry, thereby influences the effect of biological denitrification bacterium.Therefore, biological denitrificaion method water outlet ammonia nitrogen and nitrate nitrogen all are difficult to up to standard.Specifically:
I, chemical precipitation method are to point to add phosphoric acid and magnesium oxide formation magnesium ammonium phosphate sediment (MAP) in the waste water that contains ammonia nitrogen in high density, and this method can only be removed the ammonia nitrogen in the waste water, can not remove the nitrate nitrogen in the waste water, and the chemical precipitation method medicament is costly.
II, ammonia stripping and vaporizing extract process are after adding alkali raising pH to 9～11 in the sensing waste water, NH in the water
4 +Become molecular state ammonia, will reach stripping denitrogenation purpose in air or the steam feeding water.The requirement of this technology alkali is big, and gas-water ratio is 3500～4000: 1 during air stripping, and power consumption is very big.The ammonia that stripping goes out causes secondary pollution to atmosphere, and noise is very big, and can not remove the nitrate nitrogen in the waste water.
III, biological denitrificaion method comprise biological nitration and denitrification.Biological nitration is meant under aerobic condition, by nitrite bacteria, ammonia nitrogen is oxidized to nitrite earlier, under the effect of Nitromonas nitrite is converted into nitrate subsequently, reach nitrated fully, 1.0mg (NH
3-N)/and L just needs the dissolved oxygen of 4.6mg/L, and waste water oxygenic aeration power consumption is big, and this process is subjected to Temperature Influence very big.Wastewater from nitrogenous fertilizer industry contains ammonia nitrogen in high density, suppresses the growth of biological nitration bacterium, thereby even also be difficult to ammonia nitrogen is oxidized to nitrite and nitrate under aerobic condition.
Denitrification is meant under anoxia condition, by the effect of denitrifying bacteria, with NO
3 -And NO
2 -Be reduced to N
2Process, the electron donor of this process is various carbon sources, in the wastewater from nitrogenous fertilizer industry carbonaceous organic material seldom, so biological denitrification process need replenish enough carbon sources, this is very expensive.The low temperature nitrification efficiency is very low simultaneously, the operational management complexity, and the excess sludge of biological denitrificaion produces secondary pollution.
Summary of the invention
A kind for the treatment of nitrogen-containing wastewater by ion exchange of the present invention and the purpose that reclaims ammonium nitrate technology are, at the defective of art breading nitrogen fertilizer plant nitrogenous effluents such as chemical precipitation method, ammonia stripping, stripping and biological denitrificaion, a kind of strongly acidic cation exchanger that proposes effectively processing nitrogen fertilizer plant nitrogenous effluent is removed the ion-exchange treatment process that ammonia nitrogen-weakly-basic anion interchanger is removed nitrate nitrogen.Water outlet ammonia nitrogen and nitrate nitrogen after wastewater from nitrogenous fertilizer industry is handled reaches in " ammonia synthesizing industry pollution discharge standard " (GB 13458-2001) and the quality of groundwater standard III class tap water respectively to the requirement (GB/T14848-93) of nitrate nitrogen.Thereby a kind of technical scheme of two-stage ion exchange process of strongly acidic cation exchanger-weakly-basic anion interchanger of handling nitrogen fertilizer plant's nitrogenous effluent of ammonia nitrogen in high density and middle concentration nitrate nitrogen is disclosed, cationic, anionic exchange resin after exchange is handled adopts nitric acid and ammoniacal liquor to regenerate respectively, regeneration waste liquid is an ammonium nitrate solution, can reclaim ammonium nitrate through carrying after dense.
A kind for the treatment of nitrogen-containing wastewater by ion exchange of the present invention also reclaims the technology of ammonium nitrate, it is characterized in that it being a kind ofly to adopt strongly acidic cation exchanger-weakly-basic anion interchanger to connect to realize the processing of nitrogenous effluent, finish the removal of ammonia nitrogen and nitrate nitrogen in the nitrogenous effluent respectively with strongly acidic cation exchanger and weakly-basic anion interchanger, storng-acid cation exchange resin and weak base anion-exchange resin after exchange is handled adopt nitric acid and ammoniacal liquor to regenerate respectively, regeneration waste liquid is an ammonium nitrate solution, through putting forward the technology that can reclaim ammonium nitrate after dense, this technical process is composed in series by strongly acidic cation exchanger 2 and weakly-basic anion interchanger 4, adopt suspended solids and algae in flocculation and the filtration pre-treatment removal waste water, the organism in the waste water is removed in the charcoal absorption pre-treatment, enter strongly acidic cation exchanger 2 successively through pretreated nitrogen fertilizer plant nitrogenous effluent 1, strongly acidic cation exchanger water outlet 3 enters 4 water outlets afterwards of weakly-basic anion interchanger, and concrete steps are:
I. with nitric acid regeneration, regeneration waste liquid was an ammonium nitrate after the storng-acid cation exchange resin in the strongly acidic cation exchanger 2 lost efficacy; 15～30 ℃ of operations down of water temperature, water inlet pH value is 6～8; The exchange flow velocity is 4～20m/h, nitric acid regenerated liquid concentration 10～30%, and regeneration velocity 4～10m/h, positive and negative wash speed is got 15～20m/h, and the positive and negative time of washing is got 20～30min; Storng-acid cation exchange resin in the strongly acidic cation exchanger 2 is that functional group is sulfonic group-SO
3The domestic and imported storng-acid cation exchange resin of H, described these ion exchange resin are: D001, D61,001 * 7,001 * 4, D72,742, JK008, D631, Amberjet 1200Na, Amberlite 200C Na or Amberlite IR120 Na.
II. with ammoniacal liquor regeneration, regeneration waste liquid also was an ammonium nitrate after the weak base anion-exchange resin in the weakly-basic anion interchanger 4 lost efficacy; 15～30 ℃ of operations down of water temperature, water inlet pH value is 6～8; The exchange flow velocity is 4～20m/h, ammoniacal liquor regenerated liquid concentration 5～20%, and regeneration velocity 4～10m/h, positive and negative wash speed is got 15～20m/h, and the positive and negative time of washing is got 20～30min; Weak base anion-exchange resin in the weakly-basic anion interchanger 4 is that functional group is respectively primary amino-CH
2NH
2, secondary amino group-CH
2NHCH
3Or uncle amino-CH
2N (CH
3)
2The domestic and imported weak base anion-exchange resin, described these ion exchange resin are: D370, D301
f, D301, D380,710-A, 710-B, 301, D306, D113, D336 or Amberlite IRA96 RF.
III. nitrogen fertilizer plant's nitrogenous effluent water outlet ammonia nitrogen of handling through I reaches " ammonia synthesizing industry pollution discharge standard " (GB 13458-2001), the water outlet nitrate nitrogen of handling through II reaches in the quality of groundwater standard III class tap water to the requirement (GB/T14848-93) of nitrate nitrogen, be re-used as boiler water-filling, cooling tower raw make up water and other water of productive use of nitrogen fertilizer plant, realized the recycle of water, the ammonium nitrate that the while regeneration waste liquid reclaims after evaporation concentration returns production technique, has realized the utilization again of waste liquid.
A kind for the treatment of nitrogen-containing wastewater by ion exchange of the present invention also reclaims the advantage and the purposes of the technology of ammonium nitrate:
The present invention adopts the placed in-line ion exchange process of strongly acidic cation exchanger-weakly-basic anion interchanger to handle nitrogen fertilizer plant's nitrogenous effluent, simpler than biological denitrification process flow process, processing efficiency is subjected to Temperature Influence to be subjected to Temperature Influence little than biological denitrificaion simultaneously, operational management is flexible, does not produce secondary pollution.Treat effluent ammonia nitrogen and nitrate nitrogen reach in " ammonia synthesizing industry pollution discharge standard " (GB 13458-2001) and the quality of groundwater standard III class tap water respectively to the requirement (GB/T14848-93) of nitrate nitrogen, be re-used as boiler water-filling, cooling tower raw make up water and other water of productive use of nitrogen fertilizer plant, reach the recycle purpose of water, solve the outstanding problem of present short water supply.With the ammonia nitrogen in the strongly acidic cation exchanger removal waste water, with the nitrate nitrogen in the weakly-basic anion interchanger removal waste water, storng-acid cation exchange resin and weak base anion-exchange resin after exchange is handled adopt nitric acid and ammoniacal liquor to regenerate respectively, regeneration waste liquid is ammonium nitrate solution, can reclaim ammonium nitrate through carrying after dense, realized the utilization again of waste liquid, turned waste into wealth to have tangible environmental benefit and economic benefit.
Description of drawings
Fig. 1 strongly acidic cation exchanger-weakly-basic anion interchanger series process flow
Among the figure: the 1-water inlet
2-strongly acidic cation exchanger (employing storng-acid cation exchange resin)
The water outlet of 3-strongly acidic cation exchanger
4-weakly-basic anion exchange interchanger (employing weak base anion-exchange resin)
The 5-water outlet
6-strongly acidic cation exchanger nitric acid regenerated liquid
7-weakly-basic anion exchange interchanger ammoniacal liquor regenerated liquid
8-regeneration waste liquid ammonium nitrate
The 9-evaporation concentration reclaims the ammonium nitrate device
Embodiment:
Embodiment 1:
Ion exchange resin adopts storng-acid cation exchange resin D001 and weak base anion-exchange resin D370.
Strongly acidic cation exchanger: 15 ℃ of operations down of water temperature, water inlet pH value is 6; The exchange flow velocity is 4m/h, nitric acid regenerated liquid concentration 10%, and regeneration velocity is 4m/h, and positive and negative wash speed is got 15m/h, and the positive and negative time of washing is got 20min;
The weakly-basic anion interchanger: 15 ℃ of operations down of water temperature, water inlet pH value is 6; The exchange flow velocity is 4m/h, ammoniacal liquor regenerated liquid concentration 5%, and regeneration velocity is 4m/h, and positive and negative wash speed is got 15m/h, and the positive and negative time of washing is got 20min.
Embodiment 2:
Ion exchange resin adopts storng-acid cation exchange resin D001 and weak base anion-exchange resin D370.
Strongly acidic cation exchanger: 15 ℃ of operations down of water temperature, water inlet pH value is 7; The exchange flow velocity is 4m/h, nitric acid regenerated liquid concentration 20%, and regeneration velocity is 4m/h, and positive and negative wash speed is got 15m/h, and the positive and negative time of washing is got 20min;
The weakly-basic anion interchanger: 15 ℃ of operations down of water temperature, water inlet pH value is 7; The exchange flow velocity is 4m/h, ammoniacal liquor regenerated liquid concentration 15%, and regeneration velocity is 4m/h, and positive and negative wash speed is got 15m/h, and the positive and negative time of washing is got 20min.
Embodiment 3:
Ion exchange resin adopts storng-acid cation exchange resin D001 and weak base anion-exchange resin D370.
Strongly acidic cation exchanger: 15 ℃ of operations down of water temperature, water inlet pH value is 8; The exchange flow velocity is 6m/h, nitric acid regenerated liquid concentration 30%, and regeneration velocity is 5m/h, and positive and negative wash speed is got 15m/h, and the positive and negative time of washing is got 20min;
The weakly-basic anion interchanger: 15 ℃ of operations down of water temperature, water inlet pH value is 8; The exchange flow velocity is 6m/h, ammoniacal liquor regenerated liquid concentration 20%, and regeneration velocity is 5m/h, and positive and negative wash speed is got 15m/h, and the positive and negative time of washing is got 20min.
Embodiment 4:
Ion exchange resin adopts storng-acid cation exchange resin D61 and weak base anion-exchange resin D301
f
Strongly acidic cation exchanger: 25 ℃ of operations down of water temperature, water inlet pH value is 6; The exchange flow velocity is 6m/h, nitric acid regenerated liquid concentration 10%, and regeneration velocity is 5m/h, and positive and negative wash speed is got 15m/h, and the positive and negative time of washing is got 25min;
The weakly-basic anion interchanger: 25 ℃ of operations down of water temperature, water inlet pH value is 6; The exchange flow velocity is 6m/h, ammoniacal liquor regenerated liquid concentration 5%, and regeneration velocity is 5m/h, and positive and negative wash speed is got 15m/h, and the positive and negative time of washing is got 25min.
Embodiment 5:
Ion exchange resin adopts storng-acid cation exchange resin D61 and weak base anion-exchange resin D301
f
Strongly acidic cation exchanger: 25 ℃ of operations down of water temperature, water inlet pH value is 7; The exchange flow velocity is 8m/h, nitric acid regenerated liquid concentration 20%, and regeneration velocity is 6m/h, and positive and negative wash speed is got 15m/h, and the positive and negative time of washing is got 25min;
The weakly-basic anion interchanger: 25 ℃ of operations down of water temperature, water inlet pH value is 7; The exchange flow velocity is 8m/h, ammoniacal liquor regenerated liquid concentration 15%, and regeneration velocity is 6m/h, and positive and negative wash speed is got 15m/h, and the positive and negative time of washing is got 25min.
Embodiment 6:
Ion exchange resin adopts storng-acid cation exchange resin D61 and weak base anion-exchange resin D301
f
Strongly acidic cation exchanger: 25 ℃ of operations down of water temperature, water inlet pH value is 8; The exchange flow velocity is 10m/h, nitric acid regenerated liquid concentration 30%, and regeneration velocity is 8m/h, and positive and negative wash speed is got 15m/h, and the positive and negative time of washing is got 25min;
The weakly-basic anion interchanger: 25 ℃ of operations down of water temperature, water inlet pH value is 8; The exchange flow velocity is 10m/h, ammoniacal liquor regenerated liquid concentration 20%, and regeneration velocity is 8m/h, and positive and negative wash speed is got 15m/h, and the positive and negative time of washing is got 25min.
Embodiment 7:
Ion exchange resin adopts storng-acid cation exchange resin 001 * 7 and weak base anion-exchange resin D301.
Strongly acidic cation exchanger: 30 ℃ of operations down of water temperature, water inlet pH value is 6; The exchange flow velocity is 12m/h, nitric acid regenerated liquid concentration 10%, and regeneration velocity is 8m/h, and positive and negative wash speed is got 18m/h, and the positive and negative time of washing is got 30min;
The weakly-basic anion interchanger: 30 ℃ of operations down of water temperature, water inlet pH value is 6; The exchange flow velocity is 12m/h, ammoniacal liquor regenerated liquid concentration 5%, and regeneration velocity is 8m/h, and positive and negative wash speed is got 18m/h, and the positive and negative time of washing is got 30min.
Embodiment 8:
Ion exchange resin adopts storng-acid cation exchange resin 001 * 7 and weak base anion-exchange resin D301.
Strongly acidic cation exchanger: 30 ℃ of operations down of water temperature, water inlet pH value is 7; The exchange flow velocity is 12m/h, nitric acid regenerated liquid concentration 20%, and regeneration velocity is 9m/h, and positive and negative wash speed is got 18m/h, and the positive and negative time of washing is got 30min;
The weakly-basic anion interchanger: 30 ℃ of operations down of water temperature, water inlet pH value is 7; The exchange flow velocity is 12m/h, ammoniacal liquor regenerated liquid concentration 15%, and regeneration velocity is 9m/h, and positive and negative wash speed is got 18m/h, and the positive and negative time of washing is got 30min.
Embodiment 9:
Ion exchange resin adopts storng-acid cation exchange resin 001 * 7 and weak base anion-exchange resin D301.
Strongly acidic cation exchanger: 30 ℃ of operations down of water temperature, water inlet pH value is 8; The exchange flow velocity is 14m/h, nitric acid regenerated liquid concentration 30%, and regeneration velocity is 9m/h, and positive and negative wash speed is got 18m/h, and the positive and negative time of washing is got 30min;
The weakly-basic anion interchanger: 30 ℃ of operations down of water temperature, water inlet pH value is 8; The exchange flow velocity is 14m/h, ammoniacal liquor regenerated liquid concentration 20%, and regeneration velocity is 9m/h, and positive and negative wash speed is got 18m/h, and the positive and negative time of washing is got 30min.
Embodiment 10:
Ion exchange resin adopts storng-acid cation exchange resin 001 * 4 and weak base anion-exchange resin D380.
Strongly acidic cation exchanger: 25 ℃ of operations down of water temperature, water inlet pH value is 6; The exchange flow velocity is 14m/h, nitric acid regenerated liquid concentration 10%, and regeneration velocity is 10m/h, and positive and negative wash speed is got 20m/h, and the positive and negative time of washing is got 30min;
The weakly-basic anion interchanger: 25 ℃ of operations down of water temperature, water inlet pH value is 6; The exchange flow velocity is 14m/h, ammoniacal liquor regenerated liquid concentration 5%, and regeneration velocity is 10m/h, and positive and negative wash speed is got 20m/h, and the positive and negative time of washing is got 30min.
Embodiment 11:
Ion exchange resin adopts storng-acid cation exchange resin 001 * 4 and weak base anion-exchange resin D380.
Strongly acidic cation exchanger: 25 ℃ of operations down of water temperature, water inlet pH value is 7; The exchange flow velocity is 16m/h, nitric acid regenerated liquid concentration 20%, and regeneration velocity is 10m/h, and positive and negative wash speed is got 20m/h, and the positive and negative time of washing is got 30min;
The weakly-basic anion interchanger: 25 ℃ of operations down of water temperature, water inlet pH value is 7; The exchange flow velocity is 16m/h, ammoniacal liquor regenerated liquid concentration 15%, and regeneration velocity is 10m/h, and positive and negative wash speed is got 20m/h, and the positive and negative time of washing is got 30min.
Embodiment 12:
Ion exchange resin adopts storng-acid cation exchange resin 001 * 4 and weak base anion-exchange resin D380.
Strongly acidic cation exchanger: 30 ℃ of operations down of water temperature, water inlet pH value is 8; The exchange flow velocity is 16m/h, nitric acid regenerated liquid concentration 30%, and regeneration velocity is 10m/h, and positive and negative wash speed is got 20m/h, and the positive and negative time of washing is got 30min;
The weakly-basic anion interchanger: 30 ℃ of operations down of water temperature, water inlet pH value is 8; The exchange flow velocity is 16m/h, ammoniacal liquor regenerated liquid concentration 20%, and regeneration velocity is 10m/h, and positive and negative wash speed is got 20m/h, and the positive and negative time of washing is got 30min.
Embodiment 13:
Ion exchange resin adopts storng-acid cation exchange resin D72 and weak base anion-exchange resin 710-A.
Strongly acidic cation exchanger: 15 ℃ of operations down of water temperature, water inlet pH value is 6; The exchange flow velocity is 18m/h, nitric acid regenerated liquid concentration 20%, and regeneration velocity is 10m/h, and positive and negative wash speed is got 20m/h, and the positive and negative time of washing is got 30min;
The weakly-basic anion interchanger: 15 ℃ of operations down of water temperature, water inlet pH value is 6; The exchange flow velocity is 18m/h, ammoniacal liquor regenerated liquid concentration 15%, and regeneration velocity is 10m/h, and positive and negative wash speed is got 20m/h, and the positive and negative time of washing is got 30min.
Embodiment 14:
Ion exchange resin adopts storng-acid cation exchange resin D72 and weak base anion-exchange resin 710-A.
Strongly acidic cation exchanger: 25 ℃ of operations down of water temperature, water inlet pH value is 7; The exchange flow velocity is 18m/h, nitric acid regenerated liquid concentration 30%, and regeneration velocity is 10m/h, and positive and negative wash speed is got 20m/h, and the positive and negative time of washing is got 30min;
The weakly-basic anion interchanger: 25 ℃ of operations down of water temperature, water inlet pH value is 7; The exchange flow velocity is 18m/h, ammoniacal liquor regenerated liquid concentration 20%, and regeneration velocity is 10m/h, and positive and negative wash speed is got 20m/h, and the positive and negative time of washing is got 30min.
Embodiment 15:
Ion exchange resin adopts storng-acid cation exchange resin D72 and weak base anion-exchange resin 710-A.
Strongly acidic cation exchanger: 30 ℃ of operations down of water temperature, water inlet pH value is 8; The exchange flow velocity is 20m/h, nitric acid regenerated liquid concentration 30%, and regeneration velocity is 10m/h, and positive and negative wash speed is got 20m/h, and the positive and negative time of washing is got 30min;
The weakly-basic anion interchanger: 30 ℃ of operations down of water temperature, water inlet pH value is 8; The exchange flow velocity is 20m/h, ammoniacal liquor regenerated liquid concentration 20%, and regeneration velocity is 10m/h, and positive and negative wash speed is got 20m/h, and the positive and negative time of washing is got 30min.
Embodiment 16:
Ion exchange resin adopts storng-acid cation exchange resin 742 and weak base anion-exchange resin 710-B.
Strongly acidic cation exchanger: 25 ℃ of operations down of water temperature, water inlet pH value is 6; The exchange flow velocity is 20m/h, nitric acid regenerated liquid concentration 30%, and regeneration velocity is 10m/h, and positive and negative wash speed is got 20m/h, and the positive and negative time of washing is got 30min;
The weakly-basic anion interchanger: 25 ℃ of operations down of water temperature, water inlet pH value is 6; The exchange flow velocity is 20m/h, ammoniacal liquor regenerated liquid concentration 20%, and regeneration velocity is 10m/h, and positive and negative wash speed is got 20m/h, and the positive and negative time of washing is got 30min.
Claims (1)
1. a treating nitrogen-containing wastewater by ion exchange and reclaim the technology of ammonium nitrate, it is characterized in that it being a kind ofly to adopt strongly acidic cation exchanger-weakly-basic anion interchanger to connect to realize the processing of nitrogenous effluent, finish the removal of ammonia nitrogen and nitrate nitrogen in the nitrogenous effluent respectively with strongly acidic cation exchanger and weakly-basic anion interchanger, storng-acid cation exchange resin and weak base anion-exchange resin after exchange is handled adopt nitric acid and ammoniacal liquor to regenerate respectively, regeneration waste liquid is an ammonium nitrate solution, through putting forward the technology that can reclaim ammonium nitrate after dense, this technical process is composed in series by strongly acidic cation exchanger (2) and weakly-basic anion interchanger (4), adopt suspended solids and algae in flocculation and the filtration pre-treatment removal waste water, the organism in the waste water is removed in the charcoal absorption pre-treatment, enter strongly acidic cation exchanger (2) successively through pretreated nitrogen fertilizer plant nitrogenous effluent (1), strongly acidic cation exchanger water outlet (3) enters weakly-basic anion interchanger (4) water outlet afterwards, and concrete steps are:
I. with nitric acid regeneration, regeneration waste liquid was an ammonium nitrate after the storng-acid cation exchange resin in the strongly acidic cation exchanger (2) lost efficacy; 15～30 ℃ of operations down of water temperature, water inlet pH value is 6～8; The exchange flow velocity is 4～20m/h, nitric acid regenerated liquid concentration 10～30%, and regeneration velocity 4～10m/h, positive and negative wash speed is got 15～20m/h, and the positive and negative time of washing is got 20～30min; Storng-acid cation exchange resin in the strongly acidic cation exchanger (2) is that functional group is sulfonic group-SO
3The domestic and imported storng-acid cation exchange resin of H, described these ion exchange resin are: D001, D61,001 * 7,001 * 4, D72,742, JK008, D631, Amberjet 1200Na, Amberlite 200C Na or Amberlite IR120 Na.
II. with ammoniacal liquor regeneration, regeneration waste liquid also was an ammonium nitrate after the weak base anion-exchange resin in the weakly-basic anion interchanger (4) lost efficacy; 15～30 ℃ of operations down of water temperature, water inlet pH value is 6～8; The exchange flow velocity is 4～20m/h, ammoniacal liquor regenerated liquid concentration 5～20%, and regeneration velocity 4～10m/h, positive and negative wash speed is got 15～20m/h, and the positive and negative time of washing is got 20～30min; Weak base anion-exchange resin in the weakly-basic anion interchanger (4) is that functional group is respectively primary amino-CH
2NH
2, secondary amino group-CH
2NHCH
3Or uncle amino-CH
2N (CH
3)
2The domestic and imported weak base anion-exchange resin, described these ion exchange resin are: D370, D301
f, D301, D380,710-A, 710-B, 301, D306, D113, D336 or AmberliteIRA96RF.
III. nitrogen fertilizer plant's nitrogenous effluent water outlet ammonia nitrogen of handling through I reaches " ammonia synthesizing industry pollution discharge standard " (GB 13458-2001), the water outlet nitrate nitrogen of handling through II reaches in the quality of groundwater standard III class tap water to the requirement (GB/T14848-93) of nitrate nitrogen, be re-used as boiler water-filling, cooling tower raw make up water and other water of productive use of nitrogen fertilizer plant, realized the recycle of water, the ammonium nitrate that the while regeneration waste liquid reclaims after evaporation concentration returns production technique, has realized the utilization again of waste liquid.
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| CN107244771A (en) * | 2017-08-15 | 2017-10-13 | 扬州大学 | A kind of method and system of advanced treating NO3-N and NO2-N composite waste |
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| CN112358009A (en) * | 2020-10-19 | 2021-02-12 | 深圳雅居乐环保科技有限公司 | Method for treating wastewater by using ion exchange column |
| CN112811502A (en) * | 2021-01-06 | 2021-05-18 | 贵州大学 | Novel ammonia nitrogen wastewater treatment and recovery equipment and use method |
| CN115057552A (en) * | 2022-06-23 | 2022-09-16 | 先导薄膜材料有限公司 | Concentration method of low-concentration ammonium nitrate wastewater |
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