CN104118954A - Method and device for treating wastewater by utilizing compound fertilizer waste gas - Google Patents
Method and device for treating wastewater by utilizing compound fertilizer waste gas Download PDFInfo
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- CN104118954A CN104118954A CN201410359965.XA CN201410359965A CN104118954A CN 104118954 A CN104118954 A CN 104118954A CN 201410359965 A CN201410359965 A CN 201410359965A CN 104118954 A CN104118954 A CN 104118954A
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Abstract
The invention discloses a method and device for treating wastewater by utilizing a compound fertilizer waste gas. The device comprises a wastewater collecting tank, an alkali adding regulating tank, a water storage tank, a water-slag separating tower, a clear water tank, a boiler air blower tail gas channel and a granite dust-removal desulfurization tower. The method for treating wastewater by utilizing the compound fertilizer waste gas comprises the following steps: (1), regulating a pH value of the collected wastewater to be over 10; (2), carrying out water-slag separation onto the wastewater to obtain clear water; and (3), washing the air blower tail gas by clear water, collecting the washed wastewater, repeating the steps (1), (2) and (3), and recycling the wastewater. The wastewater treatment method for treating wastes with processes of wastes against one another can remove over 85% ammonia nitrogen and over 90% phosphorus in production wastewater, so that the wastewater is treated by utilizing boiler waste heat and waste gas resources, and therefore, water is saved and wastewater treatment cost is lowered, wastes are treated with processes of wastes against one another, and economic benefits and social benefits are created.
Description
Technical field
The present invention relates to a kind of method of wastewater treatment, more particularly relate to a kind of method and device that utilizes Chemical Mixed Fertilizer off gas treatment waste water.
Background technology
The waste water that compound fertilizer enterprises produces is in process of production higher containing ammonia nitrogen and phosphorus concentration, and for processing these waste water, equipment (as the Ammonia blowing-out tower) ability of sewage device needs to increase, and technical process is long, strengthens investment and the processing cost of waste disposal plant.
Summary of the invention
The invention provides a kind of device and method that utilizes Chemical Mixed Fertilizer off gas treatment waste water.The sewage water treatment method of this kind for the treatment of of wastes with processes of wastes against one another, can remove more than 85% ammonia nitrogen in production waste, more than 90% phosphorus, reach and utilize boiler used heat, waste gas resource, dispose of sewage, water saving and reduction cost of sewage disposal, the treatment of wastes with processes of wastes against one another, creates economic benefit and social benefit.
The present invention seeks to be achieved through the following technical solutions.
The invention provides a kind of method of utilizing Chemical Mixed Fertilizer off gas treatment waste water, comprise the following steps:
(1) waste water after collection, more than regulating pH value to 10,
(2) waste water carries out water, slag separates, and obtains clear water,
(3) clear water washing blower fan tail gas,
Waste water after washing is collected, then repeating step (1), (2) and (3), recycle.
A kind of preferred method of the present invention, specifically comprises the following steps:
(1) waste water of collecting flow into and adds alkali regulating tank, more than regulating pH value to 10,
(2) waste water enters tank, and the water of tank is transported to grain slag knockout tower and separates, and grain slag knockout tower internal upper part clear water flows into clean water basin,
(3) water of clean water basin is transported to the tail gas of thionizer washing from boiler fan exhaust gas channel, and the unnecessary water of clean water basin is discharged;
The wash water of thionizer flows into wastewater collection pond, collects, then repeating step (1) (2) and (3), recycle.
Preferably, thionizer is numb stone dedusting and desulfurizing tower.
Preferably, described waste water is one or more in workshop waste water, boiler fan water coolant, boiler blowdown water or rainwater.
Preferably, described adjusting pH value is to add in proportion alkaline matter to mix by self-measuring device according to the water yield.
Described alkaline matter is preferably one or more in unslaked lime, calcium hydroxide, sodium hydroxide, sodium carbonate or calcium carbonate.
The unnecessary water of clean water basin can be discharged to waste disposal plant and process.
Clear water is transported to thionizer washing boiler fan tail gas realizes the dust-removal and desulfurizing of tail gas.
The present invention also provides a kind of device that utilizes Chemical Mixed Fertilizer off gas treatment waste water, comprises wastewater collection pond, adds alkali regulating tank, tank, grain slag knockout tower, clean water basin, boiler fan exhaust gas channel and thionizer, the import one in wastewater collection pond is connected with the pipeline of factory effluent, the outlet in wastewater collection pond successively with add alkali regulating tank and be connected with tank, the outlet at bottom of tank is connected with the fluid inlet of grain slag knockout tower by pipeline, the liquid outlet of grain slag knockout tower is connected with clean water basin water-in, clean water basin are provided with remaining water relief outlet and water outlet, the water outlet of clean water basin is connected with the fluid inlet of thionizer by pipeline, the liquid outlet of thionizer is connected with the import two in wastewater collection pond, the inlet mouth of thionizer is connected with boiler fan exhaust gas channel, the air outlet of thionizer communicates with atmosphere.
Preferably, thionizer is numb stone dedusting and desulfurizing tower.
Preferably, the outlet at bottom of described tank is provided with sludge delivery pump with the pipeline that the fluid inlet of grain slag knockout tower is connected; The water outlet of described clean water basin is provided with fresh water pump with the pipeline that the fluid inlet of thionizer is connected.
Preferably, the remaining water relief outlet of described clean water basin is connected to sewage disposal device.
The waste water producing in production process of the present invention, first carries out pre-treatment, reduces the concentration of ammonia nitrogen and phosphorus, and uses as boiler exhaust gas washing tower recirculated water, and water more than needed is transported to sewage plant processing again.Pre-treatment adds alkali and regulates pH value (boiler desulfurization also needs to add alkali and regulates pH value), then be transported to grain slag knockout tower, precipitate and the separating of water, the phosphorus of waste water and alkali reaction are phosphoric acid salt, separate in tower equipment at grain slag, be deposited in solid phase, discharge system from separating tower device bottom, reach dephosphorization effect.Clear water is transported to thionizer washing boiler fan tail gas, after washing, recycles, and utilizes the hot exhaust gas of boiler, and quite the Ammonia blowing-out tower of sewage disposal carries out vapor-liquid separation, removal of ammonia and nitrogen in thionizer.
Fiber crops stone dust-removal and desulfurizing tower body is respectively to have a small semicircle taking centre as rectangle, both sides, wherein small semicircle is taking rectangle corresponding sides as diameter, the class elliptic cylindrical of composition therefrom, desulfurization tower body top is provided with the tower top cover plate made from reinforced concrete, the centre of tower top cover plate offers a square exhanst gas outlet, facilitate fume emission, desulfurization tower body top is provided with two-layer mist eliminator, the filtration that double-deck demist is more deep.3～6 layers of spray arm also will be arranged in desulfurization tower body middle part, every layer of spray arm is connected with two spray house stewards, desulfurization tower body tower wall approaches bottom and is provided with a gas approach, desulfurization tower body bottom, be respectively equipped with a spray-absorption liquid outlet in semicircle and rectangle junction, spray-absorption liquid exports and is connected to described tank by a sealing groove.
The sewage water treatment method tool of a kind for the treatment of of wastes with processes of wastes against one another of the present invention has the following advantages:
1. automatic alkali adding, medicine and whipping appts, adds alkali medicine without personnel, and alkali, medicine enter in pond and obtain fully evenly through stirring water and alkali, medicine.
2. automatic gauge and pH value proofing unit, the moment is detected, and adds alkali, dose according to detecting data adjustment.
3. exchange by the washing water of numb stone dedusting and desulfurizing tower and the exhaust gas heat of boiler fan, can remove in factory effluent 85% ammonia nitrogen, 90% phosphorus, the water after washing recycles again after equalizing tank and grain slag separating treatment.
4. grain slag separates, and does not need labor cleaning's tank bottom slag mud, and water circulation use rate is more than 98%, saving water resource.
5. simple in structure, easy to make, reduce maintenance difficulty, save maintenance and repair cost.
6. in the time processing boiler waste gas and desulfurization, dedusting, energy is removal of ammonia and nitrogen and phosphorus simultaneously, reaches the effect of the treatment of wastes with processes of wastes against one another.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
1. wastewater collection pond, 2. adds alkali regulating tank, 3. tank, 4. sludge delivery pump, 5. grain slag knockout tower, 6. clean water basin, 7. fresh water pump, 8. boiler fan exhaust gas channel, 9. numb stone dedusting and desulfurizing tower.
Embodiment
Below in conjunction with accompanying drawing, the waste disposal plant of a kind for the treatment of of wastes with processes of wastes against one another of the present invention is further described.
Embodiment 1
As shown in the figure, utilize a device for Chemical Mixed Fertilizer off gas treatment waste water, by boiler fan exhaust gas channel 8, numb stone dedusting and desulfurizing tower 9, wastewater collection pond 1, add alkali regulating tank 2, tank 3, sludge delivery pump 4, grain slag knockout tower 5, clean water basin 6 and fresh water pump 7 and form.
The import one in wastewater collection pond 1 is connected with the pipeline of factory effluent, the outlet in wastewater collection pond 1 successively with add alkali regulating tank 2 and be connected with tank 3, the outlet at bottom of tank 3 is connected with the fluid inlet of grain slag knockout tower 5 by pipeline, the liquid outlet of grain slag knockout tower 5 is connected with clean water basin 6 water-ins, clean water basin 6 are provided with remaining water relief outlet and water outlet, the water outlet of clean water basin 6 is connected with the fluid inlet of numb stone dedusting and desulfurizing tower 9 by pipeline, the liquid outlet of fiber crops stone dedusting and desulfurizing tower 9 is connected with the import two in wastewater collection pond 1, the inlet mouth of fiber crops stone dedusting and desulfurizing tower 9 is connected with boiler fan exhaust gas channel 8, the air outlet of fiber crops stone dedusting and desulfurizing tower 9 communicates with atmosphere.
The pipeline that the outlet at bottom of described tank 3 connects the fluid inlet of grain slag knockout tower 5 is provided with sludge delivery pump 4; The pipeline that the water outlet of described clean solution tank 6 connects the fluid inlet of numb stone dedusting and desulfurizing tower 9 is provided with fresh water pump 7.
The remaining water relief outlet of described clean water basin 6 is connected to sewage disposal device.
The method of the processing waste gas of the factory effluent of monoammonium phosphate:
(1) waste water enters wastewater collection pond 1, flow into and adds alkali regulating tank 2, adds calcium hydroxide, and pH value is adjusted to 10, and the ammonia nitrogen in waste water decomposes, and the phosphorus in waste water and alkali react and generates precipitation.
(2) waste water enters tank 3, and bottom is transported to by sludge delivery pump 4 with the water of precipitation that grain slag knockout tower 5 carries out water, slag separates again, and grain slag knockout tower 5 internal upper part clear water flow into clean water basin 6 and recycle,
(3) water of clean water basin 6 is transported to numb stone dedusting and desulfurizing tower 9 by fresh water pump 7 and washs the blower fan tail gas from boiler fan exhaust gas channel 8, by the phase contact separation of hot exhaust gas and washing water, reaches the effect of dedusting, desulfurization, ammonia nitrogen removal.The unnecessary water of clean water basin 6 is discharged to waste disposal plant and processes.Washes repeating step (1) (2) and (3) again of fiber crops stone dedusting and desulfurizing tower 9.
The method of embodiment 1 can remove in factory effluent 85% ammonia nitrogen, 90% phosphorus, and the inventive method does not need labor cleaning's tank bottom slag mud, and water circulation use rate is more than 98%, saving water resource.
Embodiment 2
The method of the wastewater treatment tail gas that the production plant of potassium primary phosphate produces:
(1) waste water enters wastewater collection pond 1, flow into and adds alkali regulating tank 2, adds unslaked lime, and pH value is adjusted to 11, and the ammonia nitrogen in waste water decomposes, and the phosphorus in phosphorus and waste water in waste water and alkali react and generates precipitation.
(2) waste water enters tank 3, and bottom is transported to by sludge delivery pump 4 with the water of lime-ash that grain slag knockout tower 5 carries out water, slag separates again, and grain slag knockout tower 5 internal upper part clear water flow into clean water basin 6 and recycle,
(3) water of clean water basin 6 is transported to numb stone dedusting and desulfurizing tower 9 by fresh water pump 7 and washs the blower fan tail gas from boiler fan exhaust gas channel 8, by the phase contact separation of hot exhaust gas and washing water, reaches the effect of dedusting, desulfurization, ammonia nitrogen removal.The unnecessary water of clean water basin 6 is discharged to waste disposal plant and processes.Washes repeating step (1) (2) and (3) again of fiber crops stone dedusting and desulfurizing tower 9.
The method of embodiment 2 can remove in factory effluent 86% ammonia nitrogen, 92% phosphorus, and the inventive method does not need the slag mud of labor cleaning's tank bottom, and water circulation use rate is more than 98%, saving water resource.
Embodiment 3
The method of the wastewater treatment waste gas that the production plant of diammonium phosphate produces:
(1) waste water enters wastewater collection pond 1, flow into and adds alkali regulating tank 2, adds unslaked lime, and pH value is adjusted to 11, and the ammonia nitrogen in waste water decomposes, and the phosphorus in waste water and alkali react and generates precipitation.
(2) waste water enters tank 3, and bottom is transported to by sludge delivery pump 4 with the water of lime-ash that grain slag knockout tower 5 carries out water, slag separates again, and grain slag knockout tower 5 internal upper part clear water flow into clean water basin 6 and recycle,
(3) water of clean water basin 6 is transported to numb stone dedusting and desulfurizing tower 9 by fresh water pump 7 and washs the blower fan tail gas from boiler fan exhaust gas channel 8, by the phase contact separation of hot exhaust gas and washing water, reaches the effect of dedusting, desulfurization, ammonia nitrogen removal.The unnecessary water of clean water basin 6 is discharged to waste disposal plant and processes.Washes repeating step (1) (2) and (3) again of fiber crops stone dedusting and desulfurizing tower 9.
The method of embodiment 3 can remove in factory effluent 86% ammonia nitrogen, 92% phosphorus, and the inventive method does not need the slag mud of labor cleaning's tank bottom, and water circulation use rate is more than 98%, saving water resource.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also change and revise above-mentioned embodiment.Therefore, the present invention is not limited to embodiment disclosed and described above, also should include in the protection domain of claim of the present invention modifications and changes more of the present invention.In addition,, although used some specific terms in this specification sheets, these terms just for convenience of description, do not form any restriction to the present invention.
Claims (8)
1. a method of utilizing Chemical Mixed Fertilizer off gas treatment waste water, is characterized in that, comprises the following steps:
(1) waste water after collection, more than regulating pH value to 10,
(2) waste water carries out water, slag separates, and obtains clear water,
(3) clear water washing blower fan tail gas,
Waste water after washing is collected, then repeating step (1), (2) and (3), recycle.
2. method according to claim 1, is characterized in that, comprises the following steps:
(1) waste water of collecting flow into and adds alkali regulating tank, more than regulating pH value to 10,
(2) waste water enters tank, and the water of tank is transported to grain slag knockout tower and separates, and grain slag knockout tower internal upper part clear water flows into clean water basin,
(3) water of clean water basin is transported to the tail gas of thionizer washing from boiler fan exhaust gas channel, and the unnecessary water of clean water basin is discharged;
The wash water of thionizer flows into wastewater collection pond, collects, then repeating step (1) (2) and (3), recycle.
3. method according to claim 1 and 2, is characterized in that, described waste water is one or more in workshop waste water, boiler fan water coolant, boiler blowdown water or rainwater.
4. method according to claim 1 and 2, is characterized in that, described adjusting pH value is to add in proportion alkaline matter to mix by self-measuring device according to the water yield.
5. method according to claim 4, is characterized in that, described alkaline matter is one or more in unslaked lime, calcium hydroxide, sodium hydroxide, sodium carbonate or calcium carbonate.
6. a device that utilizes Chemical Mixed Fertilizer off gas treatment waste water, is characterized in that, comprises wastewater collection pond, adds alkali regulating tank, tank, grain slag knockout tower, clean water basin, boiler fan exhaust gas channel and thionizer, the import one in wastewater collection pond is connected with the pipeline of factory effluent, the outlet in wastewater collection pond successively with add alkali regulating tank and be connected with tank, the outlet at bottom of tank is connected with the fluid inlet of grain slag knockout tower by pipeline, the liquid outlet of grain slag knockout tower is connected with clean water basin water-in, clean water basin are provided with remaining water relief outlet and water outlet, the water outlet of clean water basin is connected with the fluid inlet of thionizer by pipeline, the liquid outlet of thionizer is connected with the import two in wastewater collection pond, the inlet mouth of thionizer is connected with boiler fan exhaust gas channel, the air outlet of thionizer communicates with atmosphere.
7. device according to claim 6, is characterized in that, the outlet at bottom of described tank is provided with sludge delivery pump with the pipeline that the fluid inlet of grain slag knockout tower is connected; The water outlet of described clean water basin is provided with fresh water pump with the pipeline that the fluid inlet of thionizer is connected.
8. device according to claim 7, is characterized in that, the remaining water relief outlet of described clean water basin is connected to sewage disposal device.
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| CN201410359965.XA CN104118954B (en) | 2014-07-25 | 2014-07-25 | A kind of method and device utilizing Chemical Mixed Fertilizer off gas treatment waste water |
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| CN201410359965.XA CN104118954B (en) | 2014-07-25 | 2014-07-25 | A kind of method and device utilizing Chemical Mixed Fertilizer off gas treatment waste water |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104445725A (en) * | 2014-11-20 | 2015-03-25 | 常州大学 | Integral device for treating waste gas and high-concentration ammonia nitrogen containing waste water |
| CN105688551A (en) * | 2016-02-29 | 2016-06-22 | 瓮福（集团）有限责任公司 | Device for treating ammonium phosphate tail gas dust and using method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000334472A (en) * | 1999-05-26 | 2000-12-05 | Kurita Water Ind Ltd | Treatment of waste water |
| CN101337729A (en) * | 2007-07-03 | 2009-01-07 | 长春大成实业集团有限公司 | Processing process for fermentation waste liquid of lysine |
| CN101928046A (en) * | 2010-08-31 | 2010-12-29 | 瓮福（集团）有限责任公司 | Comprehensive utilization method for wastewater of ammonium phosphate production |
| CN202322537U (en) * | 2011-11-25 | 2012-07-11 | 武汉兴能环保技术有限公司 | Ammonia desulphurization waste water treatment equipment |
| CN103214118A (en) * | 2013-04-03 | 2013-07-24 | 国家电网公司 | Method for treating waste water by utilizing dust-containing smoke gas of coal-fired boiler |
| CN203436980U (en) * | 2013-08-27 | 2014-02-19 | 瓮福（集团）有限责任公司 | Device for treating waste gas in diammonium phosphate production |
-
2014
- 2014-07-25 CN CN201410359965.XA patent/CN104118954B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000334472A (en) * | 1999-05-26 | 2000-12-05 | Kurita Water Ind Ltd | Treatment of waste water |
| CN101337729A (en) * | 2007-07-03 | 2009-01-07 | 长春大成实业集团有限公司 | Processing process for fermentation waste liquid of lysine |
| CN101928046A (en) * | 2010-08-31 | 2010-12-29 | 瓮福（集团）有限责任公司 | Comprehensive utilization method for wastewater of ammonium phosphate production |
| CN202322537U (en) * | 2011-11-25 | 2012-07-11 | 武汉兴能环保技术有限公司 | Ammonia desulphurization waste water treatment equipment |
| CN103214118A (en) * | 2013-04-03 | 2013-07-24 | 国家电网公司 | Method for treating waste water by utilizing dust-containing smoke gas of coal-fired boiler |
| CN203436980U (en) * | 2013-08-27 | 2014-02-19 | 瓮福（集团）有限责任公司 | Device for treating waste gas in diammonium phosphate production |
Non-Patent Citations (2)
| Title |
|---|
| 熊万刚等: ""复合肥喷浆造粒机尾气治理方法"", 《发酵科技通讯》 * |
| 黄进等: ""磷酸二铵反应造粒尾气预热的利用"", 《磷肥与复肥》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104445725A (en) * | 2014-11-20 | 2015-03-25 | 常州大学 | Integral device for treating waste gas and high-concentration ammonia nitrogen containing waste water |
| CN104445725B (en) * | 2014-11-20 | 2016-02-10 | 常州大学 | Waste gas and high-concentration ammonia nitrogenous wastewater process integrated apparatus |
| CN105688551A (en) * | 2016-02-29 | 2016-06-22 | 瓮福（集团）有限责任公司 | Device for treating ammonium phosphate tail gas dust and using method thereof |
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| CN104118954B (en) | 2016-02-17 |
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