CN101367588A - Method for advanced treatment of ammonia nitrogen and phosphor containing wastewater - Google Patents

Method for advanced treatment of ammonia nitrogen and phosphor containing wastewater Download PDF

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Publication number
CN101367588A
CN101367588A CNA2008101398519A CN200810139851A CN101367588A CN 101367588 A CN101367588 A CN 101367588A CN A2008101398519 A CNA2008101398519 A CN A2008101398519A CN 200810139851 A CN200810139851 A CN 200810139851A CN 101367588 A CN101367588 A CN 101367588A
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phosphorus
waste water
wastewater
ammonia nitrogen
water
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CN101367588B (en
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蒋宏伟
蒋轶军
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Wudi Xinyue Chemical Group Co.,Ltd.
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蒋轶军
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Abstract

The invention belongs to the technology field of wastewater treatment, relates to a method on advanced treatment of wastewater containing ammonia, nitrogen and phosphorus. The following steps are mainly taken: (1) the wastewater with ammonia, nitrogen and phosphorus is primarily treated by grate and regulating sedimentation tank; (2) the wastewater is pumped into the reactionary pot of molecular sieve integration processing equipment, and the molecular sieve is used to adsorb the ammonia, nitrogen and phosphorus in the wastewater; (3) the wastewater which achieves the wastewater discharge standard or wastewater renovation standard is stored in the clear water tank; (4) when the molecular sieve in the reactionary pot is saturated, thin lye liquid with the weight proportion of 0.5-20 percent is pumped into the reactionary pot through a regenerative pump, and after being substituted and reversed, the concentration of the ammonia liquid can be raised to 7 percent and the ammonia can be reclaimed to be made into fertilizer. The method on advanced treatment of wastewater containing ammonia, nitrogen and phosphorus has simple technological process and good processing effect for ammonia, nitrogen and phosphorus. The method can satisfy the strict wastewater discharge requirement or wastewater renovation standard for ammonia, nitrogen and phosphorus. The treated wastewater and sludge can be fully used, and resources can be saved.

Description

A kind of advanced treatment contains the method for ammonia nitrogen and phosphorus waste water
Technical field
The invention belongs to the deep treatment method technical field of waste water, particularly a kind of advanced treatment contains the method for ammonia nitrogen and phosphorus waste water.
Background technology
China is the country of a water resources poorness, is again a with serious pollution country of water.According to statistics, in 668 cities, the whole nation, 400 long-term insufficient waters in city wherein, have 110 city serious water shortages, and a day water deficit reaches 1,600 ten thousand cubes, and 6,000,000,000 cubes of year water deficits are because annual more than 2,000 hundred million yuan of the industrial output values that influence of lack of water.13 provinces in the north (district, city) have 318 urban water shortages above county level, many cities to be forced to limitation water-feeding in limited time.The urban water shortage problem arrived must solution stage.On the other hand, China's quantity of wastewater effluent increases year by year, and 17,900,000,000 cubes of 35,100,000,000 cubes of being increased to 1999 from nineteen ninety increased to 53,700,000,000 cubes by 2006.For this reason, from the later stage nineties in last century, country has strengthened the dynamics of preventing and treating that water pollutes, strict sewage drainage standard, and beginning is a large amount of builds the municipal sewage plant, and has put into effect the relevant policies and the statutory standard of middle water reuse successively.To end in 2006,107 the key cities' sewage centralizeds treatment rate in the whole nation by 1999 5.6%, reached 2006 72.3%, but the pollution of National urban inland lake is still very serious, except that the Kunming Lake, Pekinese is III water quality, other all are bad V class water quality, and main contamination index is ammonia nitrogen, total nitrogen and total phosphorus.
The treatment process of ammonia nitrogen, total nitrogen and total phosphorus at present domestic advanced treatment of wastewater and the middle water reuse, mainly contain two big classes: a class is the materialization treatment technology, comprise stripping (or stripping), flocculation sediment, film absorption, wet oxidation etc., another kind of is bio-denitrification technology.
But these technology exist, and investment cost is big, running cost is high, nitric efficiency is low, can not satisfy the strict problems such as ammonia nitrogen, total nitrogen and total phosphorus index request of middle water reuse, and deals with improperly also and may bring secondary pollution.
Summary of the invention
The present invention is in order to overcome the problem of above existence, provide a kind of advanced treatment to contain the method for ammonia nitrogen and phosphorus waste water, utilize the novel molecular sieve material and in conjunction with distinctive technical process, to the sewage that contains ammonia nitrogen and phosphorus and in ammonia nitrogen and phosphorus in the water reuse carry out advanced treatment.
The present invention is achieved by the following technical solutions:
A kind of advanced treatment contains the method for ammonia nitrogen and phosphorus waste water, adopts following steps:
(1) waste water that will contain ammonia nitrogen and phosphorus through grid, regulate the preliminary treatment that settling tank removes foreign material, homogeneous water quality, precipitating sludge and suspended substance;
(2) waste water is pumped in the retort of molecular sieve integrated equipment for wastewater treatment, utilize ammonia nitrogen and phosphorus in the molecular screen material absorption waste water;
(3) reach sewage drainage standard NH after treatment 3The standard NH of-N≤5mg/l and TP≤0.5mg/l or middle water reuse 3The waste water of-N≤0.5mg/l and TP≤0.1mg/l is stored in clean water basin;
When (4) molecular screen material in the retort is saturated, be that 0.5%~20% sig water pumps in the retort with massfraction, reflux, make ammoniacal liquor concentration be promoted to 7% and reclaim when above and make farming fertilizer by continuous displacement by regenerative pump.
Advanced treatment of the present invention contains the method for ammonia nitrogen and phosphorus waste water, and the waste water after preliminary treatment carries out flocculation sediment and stripping is handled.Described stripping is handled and is carried out in stripping tower, in the stripping tower import, by the pH regulator system pH value of waste water is transferred to 11, exports at stripping tower, by the pH regulator system pH value of waste water is transferred to 8.
Advanced treatment of the present invention contains the method for ammonia nitrogen and phosphorus waste water, before or after step (2) waste water is introduced the UASB reactor or BAF is carried out a biological disposal upon.Described BAF is carried out back flushing with the water that stores in the clean water basin, and the mud of back flushing is back to and regulates precipitation in the settling tank, the outward transport of dehydration back is fertile as farming.
Advanced treatment of the present invention contains the method for ammonia nitrogen and phosphorus waste water, and described molecular screen material is that diameter is the mesopore molecular sieve of 0.1~10mm, and skeleton is by SiO 4, AlO 4, Cl, Na form.
Advanced treatment of the present invention contains the method for ammonia nitrogen and phosphorus waste water, describedly contains ammonia nitrogen and phosphorus waste water is sanitary sewage, trade effluent and percolate.
Advanced treatment of the present invention contains the method for ammonia nitrogen and phosphorus waste water, and described molecular sieve integrated equipment for wastewater treatment adopts single-column, twin columns, polystyle tank body or column container structure, the full-automatic time variable control of whole process using PLC.
The invention has the beneficial effects as follows: technical process is simple, and is good to the treatment effect of ammonia nitrogen and phosphorus, can satisfy the index request than ammonia nitrogen and phosphorus in strict sewage discharge and the middle water reuse, and waste water and mud after the processing are fully used, and saved resource.
Description of drawings
Fig. 1 is a molecular sieve integrated equipment for wastewater treatment structural representation of the present invention.
Fig. 2 contains the process flow sheet of ammonia nitrogen and phosphorus waste water for the advanced treatment of embodiment 1.
Fig. 3 contains the process flow sheet of ammonia nitrogen and phosphorus waste water for the advanced treatment of embodiment 2.
Fig. 4 contains the process flow sheet of ammonia nitrogen and phosphorus waste water for the advanced treatment of embodiment 3.
(a, b c) are the structural representation of mesopore molecular sieve to Fig. 5.
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing.
Embodiment 1
Present embodiment is the method that advanced treatment contains ammonia nitrogen and phosphorus sanitary sewage.As shown in Figure 2, be provided with coarse rack 1, water collecting basin 2, fine fack 3, adjusting settling tank 4, BAF 5, molecular sieve integrated equipment for wastewater treatment 6, sig water storage tank 6-1, weak ammonia storage tank 6-2, clean water basin 7, blower fan 8, sludge dewatering treatment system 9, suction culvert 101, back flushing suction culvert 201, back flushing return line 301, spoil disposal pipeline 401, air intake pipeline 501, sig water feeding pipeline 601, sig water outlet pipeline 701, intake pump B1, intake pump B2, regenerative pump B3 and backwashing pump B4 successively; In the molecular sieve integrated equipment for wastewater treatment 6 as shown in Figure 1, be provided with retort 6N1, retort 6N2, sig water storage tank 6-1, weak ammonia storage tank 6-2, water inlet control valve V-1, V-2, V-3, V-3, V-4, V-5, V-6, regeneration control valve V-7, V-8, V-9, V-10, V-11, V-12, V-13, ammoniacal liquor use valve V-14, suction culvert 101, regeneration pipeline 601, return line 701, intake pump B2 and regenerative pump B3 successively.
The concrete grammar of present embodiment is as follows: will contain NH 3The higher ammonia nitrogen of-N≤100mg/l and TP≤7mg/l and the sanitary sewage of phosphorus concentration, after water inlet pipe 101, coarse rack 1 are removed bulk rubbish thing, flow into water collecting basin 2, promote by intake pump B1, after fine fack 3 is removed the small-particle foreign material, flow into and regulate settling tank 4, homogeneous water quality, precipitating sludge and suspended matter flow into aeration and biological filter 5 again, by blower fan 8 air feeds, carry out a biological disposal upon, remove biological pollution materials such as COD, BOD, for still containing higher ammonia nitrogen and phosphor contaminant index NH 3The water outlet of-N≤60mg/l and TP≤4mg/l, it is pumped among the retort 6N1 or retort 6N2 of molecular sieve integrated equipment for wastewater treatment 6 through intake pump B2, utilize meso-porous molecular sieve material absorption in the retort to remove ammonia nitrogen and phosphorus in the sewage, reach the NH that requires of ammonia nitrogen and phosphorus effluent index in the emission standard 3-N≤5mg/l and TP≤0.5mg/l discharging; Or ammonia nitrogen and phosphorus NH in the middle water reuse standard 3The water outlet requirement of-N≤0.5mg/l and TP≤0.1mg/l is stored in the clean water basin 7, and apply it to view, flush the toilet, carwash, water flowers, irrigation or process water field.
When the molecular screen material among retort 6N1 or the retort 6N2 is saturated, use regenerative pump B3, by regeneration pipeline 601, be that 0.5%~20% sig water pumps among retort 6N1 or the retort 6N2 with massfraction among the sig water storage tank 6-1, utilize the Na in the sig water +Ammonium ion is cemented out from molecular screen material, the ammoniacal liquor that forms is back among the weak ammonia storage tank 6-2 by outlet pipeline 701, refluxes by continuous displacement, make ammoniacal liquor concentration among the weak ammonia storage tank 6-2 be promoted to 7% when above gradually, its recovery is made farming is fertile to be used.
BAF 5, when needing back flushing, start backwashing pump B4, with the water outlet that stores in the clean water basin 7,, BAF 5 is carried out back flushing through back flushing suction culvert 201, the mud water outlet of back flushing, through back flushing return line 301, be back in the water collecting basin 2, pass through intake pump B1 again, rise to and regulate precipitation in the settling tank 4.
Regulate in the settling tank 4, sedimentary mud is disposed to sludge dewatering treatment system 9 through spoil disposal pipeline 401, and the outward transport of dehydration back is fertile as farming.
Said process all adopts the PLC time variable control.
Embodiment 2
Present embodiment is the method that advanced treatment contains the chemical fertilizer industry waste water of ammonia nitrogen and phosphorus.As shown in Figure 3, be provided with water collecting basin 2 successively, fine fack 3, grease removal tank 4-1, regulate settling tank 4, air flotation pool 10, air compressor machine 10-1, flocculation medicine system 10-2, stripping tower 11, the 11-1 of pH regulator system, molecular sieve integrated equipment for wastewater treatment 6, sig water storage tank 6-1, weak ammonia storage tank 6-2, BAF 5, clean water basin 7, blower fan 8, sludge dewatering treatment system 9, suction culvert 101, counter-flushing pipeline 201, back flushing return line 301, spoil disposal pipeline 401, air intake pipeline 501, sig water feeding pipeline 601, rare weak ammonia return line 701, intake pump B1, intake pump B2, regenerative pump B3 and backwashing pump B4; Fig. 1 is described with embodiment 1.
The concrete grammar of present embodiment is as follows: will contain NH 3The chemical fertilizer industry waste water of the ammonia nitrogen in high density of-N≤2500mg/l, petroleum-type≤300mg/l, through water inlet pipe 101, water collecting basin 2, promote by intake pump B1, after fine fack 3 is removed the small-particle foreign material, flow into grease removal tank 4-1 and regulate settling tank 4, carry out oil removing, homogeneous water quality, precipitating sludge and suspended matter etc., the oil slick strength of grease removal tank 4-1 is provided by blower fan 8; By water inlet pipe 101, flow to air flotation pool 10 through the waste water of above-mentioned processing, by flocculation medicine system 10-2, after the dosing flocculation, 10-1 provides source of the gas by air compressor machine, and it is floating outstanding to carry out strength, removes oil in water emulsion, CN-, S 2-wait pollution substance after, be promoted to stripping tower 11 through intake pump B2, provide wind regime by blower fan 8, ammonia nitrogen in high density is carried out stripping; In order to improve the stripping effect of ammonia nitrogen, in stripping tower 11 imports,, the pH value of waste water is adjusted to 11 by the 11-1 of pH regulator system, the waste water through stripping is handled in the stripping tower outlet, by the 11-1 of pH regulator system, transfers to 8 with its pH value; After stripping is handled, will contain NH 3The waste water of-N≤400mg/l through water inlet pipe 101, flows among the retort 6N1 or retort 6N2 of molecular sieve integrated equipment for wastewater treatment 6, in retort, utilizes mesopore molecular sieve absorption to remove ammonia nitrogen in the waste water, makes that the ammonia nitrogen pollutant index reaches NH in the waste water 3-N≤5mg/l satisfies the requirement of subsequent biological treatment; Waste water through the molecular sieve integrated equipment for wastewater treatment is handled flows into BAF 5, by 8 pairs of biological tank air feeds of blower fan, carries out a biological disposal upon, and removes biological pollution materials such as COD, BOD, reaches the effluent index NH of ammonia nitrogen in the emission standard 3The requirement of-N≤5mg/l, discharging; Or the water outlet of ammonia nitrogen requires NH in the middle water reuse standard 3-N≤0.5mg/l is stored in the clean water basin 7, and apply it to view, flush the toilet, carwash, water flowers, irrigation or process water field.
Through stripping tower 11, the ammonia that stripping removes, through gas-water separation, condensation by return line 701, is back among the storage tank 6-2 after concentrating, and recycles.
The processing for the treatment of processes when molecular sieve is saturated and BAF 5 back flushinges is with embodiment 1.
Precipitating sludge in the oil slick of grease removal tank 4-1 and the adjusting settling tank 4 and the scum silica frost in the air flotation pool 10 through spoil disposal pipeline 401, are disposed to sludge dewatering treatment system 9, and the dehydration back is transported outward as farming fertile.
Said process all adopts the PLC time variable control.
Embodiment 3
Present embodiment is the method that advanced treatment contains the percolate of ammonia nitrogen.As shown in Figure 4, be provided with coarse rack 1 successively, water collecting basin 2, fine fack 3, regulate settling tank 4, mesopore molecular sieve integrated equipment for wastewater treatment 6, sig water storage tank 6-1, weak ammonia storage tank 6-2, up flow anaerobic sludge blanket reactor (being called for short the UASB reactor) 12, BAF 5, clean water basin 7, blower fan 8, sludge dewatering treatment system 9, suction culvert 101, counter-flushing pipeline 201, back flushing return line 301, spoil disposal pipeline 401, air intake pipeline 501, sig water feeding pipeline 601, weak ammonia return line 701, intake pump B1, intake pump B2, regenerative pump B3 and backwashing pump B4; Fig. 1 is described with embodiment 1.
The concrete grammar of present embodiment is as follows: will contain 200≤NH 3The percolate of-N≤2000mg/l than high-concentration ammonia-nitrogen, after water inlet pipe 101, coarse rack 1 are removed bulk rubbish thing, flow into water collecting basin 2, promote through intake pump B1 again, after in fine fack 3, removing the small-particle foreign material, flow into and regulate settling tank 4, behind homogeneous water quality, precipitating sludge and the suspended matter, pump among the retort 6N1 or retort 6N2 of molecular sieve integrated equipment for wastewater treatment 6 by intake pump B2 again.In retort, ammonia nitrogen higher in the percolate is removed by the absorption of the meso-porous molecular sieve material in the tank body, reaches NH 3-N≤100mg/l satisfies the requirement of subsequent biological treatment; With the waste water after the above-mentioned processing through intake pump B5, pump into the UASB reactor, carry out anaerobic treatment, after the COD of percolate middle and high concentration is removed, flow into BAF 5 again,, carry out aerobe and handle by 8 pairs of BAF 5 air feeds of blower fan, remove biological pollution materials such as COD, BOD, what reach emission standard requires COD≤100mg/l, BOD≤30mg/l, NH 3-N≤5mg/l, discharging; Or be stored in the clean water basin 7, further handle the back and use.
Other treating processess are with embodiment 1.
Said process all adopts the PLC time variable control.

Claims (7)

1. an advanced treatment contains the method for ammonia nitrogen and phosphorus waste water, it is characterized in that adopting following steps:
(1) waste water that will contain ammonia nitrogen and phosphorus through grid, regulate the preliminary treatment that settling tank removes foreign material, homogeneous water quality, precipitating sludge and suspended substance;
(2) waste water is pumped in the retort of molecular sieve integrated equipment for wastewater treatment, utilize ammonia nitrogen and phosphorus in the molecular screen material absorption waste water;
(3) reach sewage drainage standard NH after treatment 3The standard NH of-N≤5mg/l and TP≤0.5mg/l or middle water reuse 3The waste water of-N≤0.5mg/l and TP≤0.1mg/l is stored in clean water basin;
When (4) molecular screen material in the retort is saturated, be that 0.5%~20% sig water pumps in the retort with massfraction, reflux, make ammoniacal liquor concentration be promoted to 7% and reclaim when above and make farming fertilizer by continuous displacement by regenerative pump.
2. processing according to claim 1 contains the method for ammonia nitrogen and phosphorus waste water, it is characterized in that: the waste water after preliminary treatment carries out flocculation sediment and stripping is handled.
3. advanced treatment according to claim 1 contains the method for ammonia nitrogen and phosphorus waste water, it is characterized in that: before or after step (2) waste water is introduced the UASB reactor or BAF is carried out a biological disposal upon.
4. contain the method for ammonia nitrogen and phosphorus waste water according to claim 1,2 or 3 described advanced treatment, it is characterized in that: described molecular screen material is that diameter is the mesopore molecular sieve of 0.1~10mm, and skeleton is by SiO 4, AlO 4, Cl, Na form.
5. advanced treatment according to claim 2 contains the method for ammonia nitrogen and phosphorus waste water, it is characterized in that: described stripping is handled and is carried out in stripping tower, in the stripping tower import, by the pH regulator system pH value of waste water is transferred to 11, in stripping tower outlet, the pH value of waste water is transferred to 8 by the pH regulator system.
6. advanced treatment according to claim 3 contains the method for ammonia nitrogen and phosphorus waste water, it is characterized in that: described BAF is carried out back flushing with the water that stores in the clean water basin, and the mud of back flushing is back to and regulates precipitation in the settling tank, the outward transport of dehydration back is fertile as farming.
7. advanced treatment according to claim 2 contains the method for ammonia nitrogen and phosphorus waste water, it is characterized in that described molecular sieve integrated equipment for wastewater treatment adopts single-column, twin columns, polystyle tank body or column container structure, the full-automatic time variable control of whole process using PLC.
CN2008101398519A 2008-09-19 2008-09-19 Method for advanced treatment of ammonia nitrogen and phosphor containing wastewater Active CN101367588B (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101838085A (en) * 2010-06-22 2010-09-22 哈尔滨工业大学 Method for carrying out resource non-aeration treatment on sewage of villages and towns
CN101898810A (en) * 2009-05-29 2010-12-01 株式会社东芝 Water treatment device
CN102001722A (en) * 2010-11-04 2011-04-06 南京大学 Method for removing phosphate from water by using zirconia-modified mesoporous silicon material
CN103224304A (en) * 2013-05-03 2013-07-31 南京理工大学 Method for removing nitrogen phosphorus from sludge fermentation liquid to improve organic acid recycling effect
CN103880245A (en) * 2014-03-19 2014-06-25 北京博力扬环保科技有限公司 Method for processing landfill leachate
CN103936189A (en) * 2014-03-19 2014-07-23 北京博力扬环保科技有限公司 Processing method for recovery processing of high ammonia nitrogen wastewater
CN108178451A (en) * 2016-04-06 2018-06-19 金华知产婺源信息技术有限公司 The processing system of ammonia nitrogen in a kind of removal sanitary wastewater
CN108218134A (en) * 2016-04-06 2018-06-29 金华知产婺源信息技术有限公司 The processing method of ammonia nitrogen in a kind of removal sanitary wastewater
CN108745304A (en) * 2018-06-19 2018-11-06 邱朝转 A kind of sorbing material of phosphorus-containing wastewater and preparation method thereof
CN110194568A (en) * 2019-06-21 2019-09-03 见嘉环境科技(苏州)有限公司 A kind of processing method of high ammonia-nitrogen wastewater
CN110282783A (en) * 2019-07-23 2019-09-27 格丰科技材料有限公司 A kind of processing system and processing method of phosphorus ammonium wastewater from chemical industry
CN111763103A (en) * 2020-06-01 2020-10-13 东方电气集团东方锅炉股份有限公司 Process for preparing calcium magnesium ammonium phosphate from desulfurization wastewater, landfill leachate and phosphorus-containing wastewater

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101898810A (en) * 2009-05-29 2010-12-01 株式会社东芝 Water treatment device
CN101898810B (en) * 2009-05-29 2014-07-16 株式会社东芝 Water treatment equipment
CN101838085A (en) * 2010-06-22 2010-09-22 哈尔滨工业大学 Method for carrying out resource non-aeration treatment on sewage of villages and towns
CN102001722A (en) * 2010-11-04 2011-04-06 南京大学 Method for removing phosphate from water by using zirconia-modified mesoporous silicon material
CN102001722B (en) * 2010-11-04 2012-06-13 南京大学 Method for removing phosphate from water by using zirconia-modified mesoporous silicon material
CN103224304B (en) * 2013-05-03 2014-07-16 南京理工大学 Method for removing nitrogen phosphorus from sludge fermentation liquid to improve organic acid recycling effect
CN103224304A (en) * 2013-05-03 2013-07-31 南京理工大学 Method for removing nitrogen phosphorus from sludge fermentation liquid to improve organic acid recycling effect
CN103936189A (en) * 2014-03-19 2014-07-23 北京博力扬环保科技有限公司 Processing method for recovery processing of high ammonia nitrogen wastewater
CN103880245A (en) * 2014-03-19 2014-06-25 北京博力扬环保科技有限公司 Method for processing landfill leachate
CN103880245B (en) * 2014-03-19 2015-07-29 北京博力扬环保科技有限公司 A kind for the treatment of process of percolate
CN108178451A (en) * 2016-04-06 2018-06-19 金华知产婺源信息技术有限公司 The processing system of ammonia nitrogen in a kind of removal sanitary wastewater
CN108218134A (en) * 2016-04-06 2018-06-29 金华知产婺源信息技术有限公司 The processing method of ammonia nitrogen in a kind of removal sanitary wastewater
CN108178451B (en) * 2016-04-06 2021-05-07 江西清绿环保有限公司 Treatment system for removing ammonia nitrogen in domestic wastewater
CN108745304A (en) * 2018-06-19 2018-11-06 邱朝转 A kind of sorbing material of phosphorus-containing wastewater and preparation method thereof
CN110194568A (en) * 2019-06-21 2019-09-03 见嘉环境科技(苏州)有限公司 A kind of processing method of high ammonia-nitrogen wastewater
CN110282783A (en) * 2019-07-23 2019-09-27 格丰科技材料有限公司 A kind of processing system and processing method of phosphorus ammonium wastewater from chemical industry
CN110282783B (en) * 2019-07-23 2021-10-22 格丰科技材料有限公司 Ammonium phosphate chemical wastewater treatment system and method
CN111763103A (en) * 2020-06-01 2020-10-13 东方电气集团东方锅炉股份有限公司 Process for preparing calcium magnesium ammonium phosphate from desulfurization wastewater, landfill leachate and phosphorus-containing wastewater

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