CN102773089A - Preparation method of catalyst for promoting transformation of ammonia nitrogen in garbage leachate wastewater - Google Patents
Preparation method of catalyst for promoting transformation of ammonia nitrogen in garbage leachate wastewater Download PDFInfo
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- CN102773089A CN102773089A CN2012102532259A CN201210253225A CN102773089A CN 102773089 A CN102773089 A CN 102773089A CN 2012102532259 A CN2012102532259 A CN 2012102532259A CN 201210253225 A CN201210253225 A CN 201210253225A CN 102773089 A CN102773089 A CN 102773089A
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Abstract
The invention discloses a preparation method of a catalyst for promoting transformation of ammonia nitrogen in garbage leachate wastewater. The preparation and application method includes the steps: firstly, using rice husk, red mud and micaceous clay as carriers, proportioning various heavy metallic salt mainly including tantalum chromic acid with polyhydroxy acid, polycarboxylic acid and an organic foaming agent to form impregnation liquid, and impregnating, drying and roasting the carriers and the impregnation liquid in an equal-volume manner to obtain the honeycomb catalyst containing various precious metals; and secondly, leading in hydrogen for reduction by placing the obtained catalyst serving as packing into an ammonia still for ammonia distillation at the temperature of 650 DEG C under the condition of nitrogen protection. The problem of secondary pollution caused by a common ammonia distillation method is solved, the ammonia nitrogen in the garbage leachate wastewater is directly transformed into nitrogen by the catalyst without high temperature or high pressure, secondary pollution is avoided, and cost is saved.
Description
Technical field
The present invention relates to a kind of method for preparing catalyst that promotes that ammonia nitrogen transforms in the percolate waste water, belong to sewage treatment area.
Background technology
Percolate is the high concentrated organic wastewater that in the landfill yard stacking process, produces owing to the decomposition of microorganism and the drip washing that receives rainwater and surface water and phreatic long period of soaking; Its ammonia nitrogen mass concentration is high; Be generally less than 5000mg/L, in the majority between 3000～4600mg/L.Ammonia nitrogen concentration in the percolate is high, can make the surface water body anoxic, water quality deterioration, thereby the collection of percolate and handle the problem that has become solution too impatient to wait.
Ammonia still process is the highly energy-consuming process, steam ammonia through steam, but ammonia still process method ammonia nitrogen removal frank is not high, can not directly convert nitrogen into, causes secondary pollution.If people's water or dilute sulfuric acid absorb, the gas complicacy that steams is not single, is not necessarily ammonia, thereby causes product to lose use value like this.At present varied to the processing of high-concentration ammonia nitrogenous wastewater, in document, be catalyst like professors such as Li Haisheng with Co/Bi, adopt CWAO technological; Under high temperature, high pressure and catalyst existence condition, the ammonia nitrogen in the percolate is degraded; Generate materials such as nitrogen and nitrate anion simultaneously, it is respond well that this method utilizes CEAO to remove in the percolate organic matter, but require under high-temperature and high-pressure conditions, to move; Must cause huge energy resource consumption, bring expensive disposal cost.To this two problem, still the end need not under the HTHP existence condition at present, directly converts ammonia nitrogen in the waste water into catalyst technology that nitrogen is realized qualified discharge and avoided the secondary pollution risk.
Summary of the invention
The technical problem that the present invention will solve:
Need to prior art that the high pH of HTHP, the rate of putting are low, the problem of secondary pollution risk when the catalysis ammonia nitrogen; The invention provides a kind of method for preparing catalyst that promotes that ammonia nitrogen transforms in the percolate waste water; Do not need under the high pH condition of HTHP directly being reduced into nitrogen discharge to the ammonia nitrogen in the percolate waste water; Solved common ammonia still process method and will under the high pH condition of HTHP, could be reduced to nitrogen cost height to high ammonia nitrogen, the ammonia still process method produces the problem that ammonia causes the secondary pollution risk.
To achieve these goals, the concrete technical scheme taked of the present invention is:
(1) carrier preliminary treatment: meter by ratio of weight and the number of copies, get 45 parts of rice husks, 20 parts of red soil, 35 parts of micas and be stained with, through oven dry, pulverizing, grind into powder, as adsorbing agent carrier;
(2) maceration extract configuration: be made into mass concentration and be respectively 6～10g/L zinc perchlorate, 3～5g/L barium hydroxide, the inclined to one side mangaic acid molybdenum of 2～8g/L, 15～25g/L chromic acid tantalum tantalum, 9～15g/L zirconia, 5～8g/L titanium silicate, 8～18g/L carbonic acid erbium, 20～30g/L citric acid, 1～3g/L paradime thylaminobenzaldehyde solution;
(3) dipping: flooded 25～33 hours according to carrier and maceration extract equal-volume (V);
(4) dry, roasting: drying is 25～33 hours under the vacuum normal temperature condition, again 108 ℃ of dryings 4 hours in baking oven; In negative pressure is that 0.6MPa, temperature are roasting 1.5 hours under 650 ℃ of conditions, is rapid cool drying under 0.2MPa, the normal temperature condition in negative pressure then, can obtain the cellular catalyst that contains multiple precious metal;
(5) activation: under the nitrogen protection condition, under 650 ℃ of conditions, feed hydrogen reducing.
The content of said honeycombed catalyst heavy metal is in oxide mass percentage: zinc oxide 10～15%, barium monoxide 5～10%, molybdenum oxide 5～10%, tantalum oxide 10～25%, zirconia 15～25%, titanium oxide 10～25%, erbium oxide 20～25%, all the other quality are carrier.
Said catalyst applications method is: be placed in the catalyst that obtains in the ammonia still as filler, depth of packing is 4～6cm, and every separated 30cm lays one deck, until cat head.
The invention has the beneficial effects as follows:
(1) can directly be reduced into nitrogen discharge to the ammonia nitrogen in the percolate waste water, can not cause secondary pollution environment;
(2) solve catalyst not needing to be reduced into nitrogen under ultra-high temperature and the pressure condition, practiced thrift cost;
(3) to percolate waste water quality situation, having selected with the chromic acid tantalum is master's catalyst, with strong points.
The inventive method ammonia nitrogen removal frank is high, and reaction speed is fast, and technology is simple, and non-secondary pollution produces, and cost is low.
Specific embodiments:
At first get 45 parts of rice husks, 20 parts of red soil, 35 parts of micaceous clays, through drying, pulverize, grind as carrier;
Be made into mass concentration and be respectively 6～10g/L zinc perchlorate, 3～5g/L barium hydroxide, the inclined to one side mangaic acid molybdenum of 2～8g/L, 15～25g/L chromic acid tantalum, 9～15g/L zirconia, 5～8g/L titanium silicate, 8～18g/L carbonic acid erbium, 20～30g/L citric acid, 1～3g/L the Methyl benzenesulfonyl hydrazine solution; Flooded 25～33 hours according to carrier and maceration extract equal-volume (V); Under the vacuum normal temperature condition dry 25～33 hours afterwards, 108 ℃ of dryings 4 hours in baking oven again; In negative pressure is that 0.6MPa, temperature are roasting 1.5 hours under 650 ℃ of conditions, is rapid cool drying under 0.2MPa, the normal temperature condition in negative pressure then, get final product the cellular catalyst that contains multiple precious metal; Under the nitrogen protection condition, under 650 ℃ of conditions, feed hydrogen reducing.Be placed in the catalyst that obtains in the ammonia still as filler at last, depth of packing is 4～6cm, and every separated 30cm lays one deck, until cat head.
Embodiment 1
At first get 45 parts of rice husks, 20 parts of red soil, 35 parts of micaceous clays, through drying, pulverize, grind as carrier; Be made into mass concentration and be respectively 8g/L zinc perchlorate, 5g/L barium hydroxide, the inclined to one side mangaic acid molybdenum of 2g/L, 18g/L chromic acid tantalum, 13g/L zirconia, 6g/L titanium silicate, 10g/L carbonic acid erbium, 25g/L citric acid, 1.5g/L the Methyl benzenesulfonyl hydrazine solution; Flooded 18 hours according to carrier and maceration extract equal-volume (V); Dry afterwards 20 hours, 108 ℃ of dryings 4 hours in baking oven again; In negative pressure is that 0.6MPa, temperature are roasting 1.5 hours under 650 ℃ of conditions, is rapid cool drying under 0.2MPa, the normal temperature condition in negative pressure then, get final product the cellular catalyst that contains multiple precious metal; Under the nitrogen protection condition, under 650 ℃ of conditions, feed hydrogen reducing.Be placed in the catalyst that obtains in the ammonia still as filler at last, depth of packing is 5cm, and every separated 30cm lays one deck, until cat head.
The percolate ammonia nitrogen concentration that produces certain refuse landfill is that the waste water of 3200mg/L is put into ammonia still and carried out ammonia still process, records NH in the air
3Content is 1.2mg/m
3, the ammonia nitrogen concentration in the waste water is reduced to 0.2mg/L, and ammonia nitrogen removal frank is 99.8%, meets the national secondary discharge standard.
Embodiment 2
At first get 45 parts of rice husks, 20 parts of red soil, 35 parts of micaceous clays, through drying, pulverize, grind as carrier;
Be made into mass concentration and be respectively 10g/L zinc perchlorate, 3g/L barium hydroxide, the inclined to one side mangaic acid molybdenum of 2g/L, 15g/L chromic acid tantalum, 15g/L zirconia, 5g/L titanium silicate, 8g/L carbonic acid erbium, 20g/L citric acid, 3g/L the Methyl benzenesulfonyl hydrazine solution; Flooded 18 hours according to carrier and maceration extract equal-volume (V); Dry afterwards 20 hours, 108 ℃ of dryings 4 hours in baking oven again; In negative pressure is that 0.6MPa, temperature are roasting 1.5 hours under 650 ℃ of conditions, is rapid cool drying under 0.2MPa, the normal temperature condition in negative pressure then, get final product the cellular catalyst that contains multiple precious metal; Under the nitrogen protection condition, under 650 ℃ of conditions, feed hydrogen reducing.Be placed in the catalyst that obtains in the ammonia still as filler at last, depth of packing is 4cm, and every separated 30cm lays one deck, until cat head.
The percolate ammonia nitrogen concentration that produces certain refuse landfill is that the waste water of 4500mg/L is put into ammonia still and carried out ammonia still process, records NH in the air
3Content is 1.1mg/m
3, the ammonia nitrogen concentration in the waste water is reduced to 0.2mg/L, and ammonia nitrogen removal frank is 98.8%, meets the national secondary discharge standard.
Embodiment 3
At first get 45 parts of rice husks, 20 parts of red soil, 35 parts of micaceous clays, through drying, pulverize, grind as carrier;
Be made into into mass concentration and be respectively 8g/L zinc perchlorate, 5g/L barium hydroxide, the inclined to one side mangaic acid molybdenum of 3g/L, 20g/L chromic acid tantalum, 12g/L zirconia, 7g/L titanium silicate, 16g/L carbonic acid erbium, 28g/L citric acid, 3g/L the Methyl benzenesulfonyl hydrazine solution; Flooded 23 hours according to carrier and maceration extract equal-volume (V); Dry afterwards 27 hours, 108 ℃ of dryings 4 hours in baking oven again; In negative pressure is that 0.6MPa, temperature are roasting 1.5 hours under 650 ℃ of conditions, is rapid cool drying under 0.2MPa, the normal temperature condition in negative pressure then, get final product the cellular catalyst that contains multiple precious metal; Under the nitrogen protection condition, under 650 ℃ of conditions, feed hydrogen reducing.Be placed in the catalyst that obtains in the ammonia still as filler at last, depth of packing is 6cm, and every separated 30cm lays one deck, until cat head.
The percolate ammonia nitrogen concentration that produces certain refuse landfill is that the waste water of 4860mg/L is put into ammonia still and carried out ammonia still process, records NH in the air
3Content is 1.2mg/m
3, the ammonia nitrogen concentration in the waste water is reduced to 0.1mg/L, and ammonia nitrogen removal frank is 99.5%, meets the national secondary discharge standard.
Claims (2)
1. method for preparing catalyst that promotes that percolate waste water middle and high concentration ammonia nitrogen transforms is characterized in that:
(1) carrier preliminary treatment: count by ratio of weight and the number of copies, get 45 parts of rice husks, 20) part red soil, 35 parts of micaceous clays are through oven dry, pulverizing, grind into powder, as adsorbing agent carrier;
(2) maceration extract configuration: be made into mass concentration and be respectively 6～10g/L zinc perchlorate, 3～5g/L barium hydroxide, the inclined to one side mangaic acid molybdenum of 2～8g/L, 15～25g/L chromic acid tantalum, 9～15g/L zirconia, 5～8g/L titanium silicate, 8～18g/L carbonic acid erbium, 20～30g/L citric acid, 1～3g/L to the Methyl benzenesulfonyl hydrazine solution;
(3) dipping: flooded 12～20 hours according to carrier and maceration extract equal-volume (V);
(4) dry, roasting: drying is 15～20 hours under the vacuum normal temperature condition, again 108 ℃ of dryings 4 hours in baking oven; In negative pressure is that 05MPa, temperature are roasting 1.5 hours under 650 ℃ of conditions, is rapid cool drying under 0.2MPa, the normal temperature condition in negative pressure then, can obtain the cellular catalyst that contains multiple precious metal;
(5) activation: under the nitrogen protection condition, under 600 ℃ of conditions, feed hydrogen reducing.
2. according to claim 1; The content of said honeycombed catalyst heavy metal is in oxide mass percentage: zinc oxide 10～15%, barium monoxide 5～10%, molybdenum oxide 5～10%, tantalum oxide 10～25%, zirconia 15～25%, titanium oxide 10～25%, erbium oxide 20～25%, all the other quality are carrier.
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| CN201210253225.9A CN102773089B (en) | 2012-07-18 | 2012-07-18 | Preparation method of catalyst for promoting transformation of ammonia nitrogen in garbage leachate wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106669735A (en) * | 2016-12-27 | 2017-05-17 | 常州大学 | Catalyst for enhancing ammonia conversion in domestic wastewater, and application method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH04293553A (en) * | 1991-03-25 | 1992-10-19 | Kurita Water Ind Ltd | Method for regenerating condensed water treating mixed bed type ion exchange apparatus |
| CN101041503A (en) * | 2007-03-20 | 2007-09-26 | 哈尔滨工业大学 | Method for removing water ammonia nitrogen by ozone catalytic oxidation intensification |
| US20090301974A1 (en) * | 2006-04-19 | 2009-12-10 | Otv Sa | Method for Wet Oxidation of Effluents Heated Essentially by Self-Combustibility, and Corresponding Installation |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04293553A (en) * | 1991-03-25 | 1992-10-19 | Kurita Water Ind Ltd | Method for regenerating condensed water treating mixed bed type ion exchange apparatus |
| US20090301974A1 (en) * | 2006-04-19 | 2009-12-10 | Otv Sa | Method for Wet Oxidation of Effluents Heated Essentially by Self-Combustibility, and Corresponding Installation |
| CN101041503A (en) * | 2007-03-20 | 2007-09-26 | 哈尔滨工业大学 | Method for removing water ammonia nitrogen by ozone catalytic oxidation intensification |
Non-Patent Citations (1)
| Title |
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| 许国强等: "氨氮废水处理技术现状及发展", 《湖南有色金属》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106669735A (en) * | 2016-12-27 | 2017-05-17 | 常州大学 | Catalyst for enhancing ammonia conversion in domestic wastewater, and application method thereof |
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