CN104609653A - System and method for removing and recovering phosphorus in waste water - Google Patents
System and method for removing and recovering phosphorus in waste water Download PDFInfo
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- CN104609653A CN104609653A CN201510009406.0A CN201510009406A CN104609653A CN 104609653 A CN104609653 A CN 104609653A CN 201510009406 A CN201510009406 A CN 201510009406A CN 104609653 A CN104609653 A CN 104609653A
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Abstract
The invention belongs to the technical field of wastewater treatment, and specifically relates to a system and a method for removing and recovering phosphorus in waste water. The technical solution of the invention is that the system for removing and recovering phosphorus in waste water comprises a biological filter I, a biological filter II, a crystallization pool and a solid-liquid separation device. The invention further provides a method for removing and recovering phosphorus in waste water. According to the technical solution, the ultrasonic treatment cooperates with anoxic/aerobic alternative biological filter, and the ultrasonic crystallization phosphorus removal technology and the anoxic/aerobic biological filter phosphorus removal technology are coupled, so that the phosphorus removal efficiency is further improved, phosphate in wastewater can be recovered directly and simply, and the problem of substandard phosphorus removal effect of existing general process is solved.
Description
Technical field
The invention belongs to technical field of waste water processing, be specifically related to the removal of Phosphorus From Wastewater and recovery system and method.
Background technology
Phosphorus be a kind of on the earth can not the resource of Natural re generation, be one of important fertilizer indispensable in agriculture production.Due to a large amount of exploitation and the natural erosion of Rock Phosphate (72Min BPL) in recent years, tellurian Rock Phosphate (72Min BPL) is probably merely able to use 100 ~ 250 years (European Fertilizer Manufacturers Association, 2000), the Rock Phosphate (72Min BPL) reserves of China probably only enough use 46 years (Shen Wei, be published in " economic research guide ", the 5th phase in 2012).On the other hand, due to the discharge of now a large amount of phosphorus-containing wastewaters, cause the serious eutrophication of water body, not only make environmental pollution serious, and cause a large amount of phosphor resource wastes.Therefore, how effectively to remove and to reclaim the phosphorus in waste water, no matter be all significant to preventing body eutrophication or alleviating phosphor resource shortage.
The technology that present stage commonly uses waste water dephosphorization and recovery phosphorus has chemical coacervating precipitation method, biological process and crystallization process.The dephosphorization of chemical coacervating precipitation method mainly utilizes other metal ions such as the phosphorus in waste water and molysite, calcium salt, magnesium salts to form the sedimentable matter of indissoluble to reach the object removing phosphorus.The biological nature that biological process dephosphorization mainly utilizes polyP bacteria can absorb phosphorus under aerobic environment reaches the object removing phosphorus, polyP bacteria (Polyphosphate Accumulating Organisms, PAOs) in anaerobic and aerobic environment, different biological activity is shown, under anaerobic environment, polyP bacteria take voltaile fatty acid as carbon source, synthesis PHAs is stored in body and preserves energy, and original phosphorus stored in releasing body, but under aerobic condition, polyP bacteria obtains energy by the PHAs of storage in decomposer, excessive absorption Phosphorus From Wastewater is stored in health, the object removing phosphorus is reached finally by discharge rich phosphorous sludge.Although chemical method dephosphorization efficiency is higher, utilize enough medicaments can reach the emission standard of one-level emission standard A " urban wastewater treatment firm pollutant emission standard (GB18918-2002) ".But chemical method needs to consume a large amount of chemical agents, and running cost is higher.The chemical sludge complicated component simultaneously produced, disposes difficulty, easily causes secondary pollution.It is comparatively economical and practical that biological process compares chemical method, but biological dephosphorization less stable, be difficult to reach emission standard by biological process merely.Be that the phosphorus that chemical method or biological process are removed all is difficult to reclaim simultaneously, the recycling of phosphor resource cannot be realized, do not meet the object of socialism Sustainable development.Crystallization process generally acknowledges the technique means (De-Bashan L.E., Bashan Y, is published in " Water Research ", the 38th volume 19 phase in 2004) can effectively removing and reclaim phosphor resource at present.Crystallization process is mainly through controlling certain reaction conditions, and as pH, temperature, ionic conditions etc., make the phosphorus in waste water and specific ion form the compound with certain crystal formation.As magnesium ammonium phosphate, hydroxyapatite etc., have reached the object removed and reclaim Phosphorus From Wastewater.In recent years, crystallizing-dephosphorizing is used in actual production by many countries, but some problems that crystallizing-dephosphorizing faces still well do not solve, and the reagent cost as crystallization reaction is too high, how to reclaim the phosphorus etc. of lower concentration.
In addition, ultrasonic technique collection cavatition, the multiple effect such as high temperature pyrolysis, advanced oxidation and supercritical oxidation all over the body, achieves certain achievement in research in water treatment field.The research such as Qiu Taiqiu shows: under ultrasonication, crystallization nucleation can realize at low saturation, the nucleus that the nucleus simultaneously formed under ultrasound condition obtains than additive method is more even, complete, the size distribution ranges of crystal grain is narrower, and ultrasonicly can also weaken intermolecular reactive force, reduces soltion viscosity, ionic concn needed for crystallization is reduced, obtain evenly crystal.
Described in summary, seeking a kind for the treatment of process effectively removing and reclaim the phosphorus in waste water has at present become problem in the urgent need to address.In conjunction with now technically not enough with recovery phosphorus aspect for waste water dephosphorization, and the ultrasonic promoter action to crystallization, and the research of the treatment process utilizing supersonic synergic biological action to remove and reclaim phosphorus is still a white space, has no relevant report.
Summary of the invention
The object of the invention is to, overcome the deficiencies in the prior art, provide a kind of removal of Phosphorus From Wastewater and recovery system and method, this technical scheme utilizes ultrasonication to work in coordination with anoxic/aerobic alternately biological filter, coupling ultrasonic crystallizing-dephosphorizing and anoxia/aerobic biological filter tank dephosphorization technique, not only further increase dephosphorization efficiency by using, and directly can reclaim the phosphoric acid salt in waste water easily, solve present stage ordinary process phosphor-removing effect problem not up to standard simultaneously.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of removal of Phosphorus From Wastewater and recovery system, comprise biological filter I, biological filter II, crystallizing pond and equipment for separating liquid from solid, water inlet pipe is connected with biological filter I and biological filter II respectively, water inlet pipe near biological filter I there is the first by-pass valve control, the water inlet pipe near biological filter II has the second by-pass valve control; Biological filter I is connected by pipeline with crystallizing pond, and pipeline has the 5th by-pass valve control, and biological filter II is connected by pipeline with crystallizing pond, and pipeline has the 6th by-pass valve control; Dosing mouth is arranged at the bottom of crystallizing pond, and crystallizing pond is connected with the bottom of equipment for separating liquid from solid by pipeline, and equipment for separating liquid from solid is the cylinder of inner hollow; Biological filter I water-in is connected with equipment for separating liquid from solid by pipeline, and pipeline has the 7th by-pass valve control; Biological filter II water-in is connected with equipment for separating liquid from solid by pipeline, and pipeline has the 8th by-pass valve control.
Aeration interface I is arranged at bottom, biological filter I of the present invention, and water outlet I is arranged at top, water outlet I pipeline has the 3rd by-pass valve control.Aeration interface II is arranged at bottom, described biological filter II, and water outlet II is arranged at top, water outlet II has the 4th by-pass valve control.Described dosing mouth distance 200mm place, crystallizing pond bottom.
The removal of Phosphorus From Wastewater and a recovery method, comprise the steps:
(1) natural membrane is carried out to biological filter I and biological filter II, after natural membrane success, containing abundant poly-phosphorus bacteria in two groups of biological filters; (2) waste water flows into biological filter I from water inlet pipe, close biological filter I aeration interface, biological filter I is anaerobic biofilter, the dissolved oxygen content of biological filter I is less than 0.5mg/L, pH controls at 7.5-8.0, temperature is at 18-30 DEG C, and hydraulic detention time 2h, COD volumetric loading is at 90-120g/ (m
3filtrate d) carry out releasing phosphorus treating processes;
(3) waste water after step (2) process flows into crystallizing pond and carries out crystallization reaction process, medicament is added in crystallization reaction pond, the medicament added is magnesium salts, the mol ratio of magnesium salts and phosphorus is 1.0:1.0-1.0:3.0, environment pH is 7.5-8.0, medicament and waste water fully mix in crystallizing pond, the waste water of crystallizing pond are applied to the ultrasonic power of 150w/L, and hydraulic detention time controls as 1h; Due to ultrasonic mechanical shear and cavatition, Phosphorus From Wastewater can form phosphate crystal in conjunction with chemical agent under lower concentration.More general chemicrystallization reaction, has not only saved chemical agent and shortened the reaction times simultaneously, and crystalline growth velocity is accelerated, and the crystal habit distribution of generation is more even, is more conducive to reclaim.
(4) waste water after step (3) process flows into equipment for separating liquid from solid, crystal continued growth, sedimentation time is 6h, crystal settling is bottom equipment for separating liquid from solid, because ion impact and the net effect of catching can make crystal continued growth in equipment for separating liquid from solid, crystal settling is bottom equipment for separating liquid from solid, and every 3 cycles of operation discharge accumulation crystal;
(5) waste water that step (4) is discharged flows into biological filter II, open biological filter II aeration interface, biological filter II is regulated to be aerobic biofilter, its dissolved oxygen content 3-5mg/L, pH=7.1-7.8, hydraulic detention time is 2h, temperature is 18-30 DEG C, carry out suction phosphorus treating processes, the waste water after inhaling phosphorus process reaches emission standard, and waste water is discharged.
The removal of Phosphorus From Wastewater of the present invention and recovery method, also comprise the steps:
A () is after the poly-phosphorus bacteria suction phosphorus in biological filter II is saturated, water outlet phosphorus concentration raises, and biological filter II aeration interface is closed, biological filter II is adjusted to anaerobic biofilter, biological filter I aeration interface is opened, biological filter I is adjusted to aerobic biofilter;
B () waste water flows into biological filter II from water inlet pipe, the dissolved oxygen content of biological filter II is less than 0.5mg/L, and pH controls at 7.5-8.0, and temperature is at 18-30 DEG C, and hydraulic detention time 2h, COD volumetric loading is at 90-120g/ (m
3filtrate d) carry out releasing phosphorus treating processes;
C the waste water after () step (b) process flows into crystallizing pond and carries out crystallization reaction process, medicament is added in crystallization reaction pond, the medicament added is magnesium salts, the mol ratio of magnesium salts and phosphorus is 1.0:1.0-1.0:3.0, environment pH is 7.5-8.0, medicament and waste water fully mix in crystallizing pond, the waste water of crystallizing pond are applied to the ultrasonic power of 150w/L, and hydraulic detention time controls as 1h;
D the waste water after () step (c) process flows into equipment for separating liquid from solid, crystal continued growth, sedimentation time is 6h, and crystal settling is bottom equipment for separating liquid from solid, and every 3 cycles of operation discharge accumulation crystal;
E waste water that () step (d) discharges flows into the dissolved oxygen content 3-5mg/L of biological filter I, biological filter I, pH=7.1-7.8, hydraulic detention time is 2h, and temperature is 18-30 DEG C, carries out suction phosphorus treating processes, waste water after inhaling phosphorus process reaches emission standard, and waste water is discharged;
After the poly-phosphorus bacteria suction phosphorus in the I of biological filter is saturated, water outlet phosphorus concentration raises, and biological filter I is adjusted to anaerobic biofilter, biological filter II is adjusted to aerobic biofilter, repeating step (2) is to (5).
The invention has the beneficial effects as follows: compared with prior art, treatment process of the present invention, ultrasonication is utilized to work in coordination with anoxic/aerobic alternately biological filter, coupling ultrasonic crystallizing-dephosphorizing and anoxia/aerobic biological filter tank dephosphorization technique, not only further increase dephosphorization efficiency by using, and the phosphoric acid salt that can directly reclaim easily in waste water, solve present stage ordinary process phosphor-removing effect problem not up to standard simultaneously.Waste water after combination process process, water outlet phosphorus concentration is less than 0.5mg/L, can reach the emission standard " urban wastewater treatment firm pollutant emission standard (GB18918-2002) " of one-level A.And utilize the crystallization of ultrasonic promotion phosphorus in waste water, enable solution, under reduction ionic concn, crystallization occur, reduce added amount of chemical, reduce process costs.Improve the crystallization rate of phosphoric acid salt at lower concentration ionic conditions, the crystal of generation is more even, and crystal is more conducive to reclaim simultaneously.The present invention is on the basis of A/O biological filter, coupling ultrasonic crystallization technique, outside filter tank, crystallization is directly reclaimed, and solves the problem that crystallization occurs easily to cause filter tank to harden in filter tank, and crystal energy is occurred at low concentrations, reduce added amount of chemical, reduce running cost, can crystallization time be shortened simultaneously, promote crystal growth, be that reaction process is more energy-conservation, be more conducive to reclaim crystallized product.So the present invention is a kind of environmentally friendly treatment process of novel energy-conserving.
Accompanying drawing explanation
Fig. 1 is the removal of Phosphorus From Wastewater of the present invention and the connection diagram of recovery system;
In figure: 1-biological filter I, 2-crystallizing pond, 3-equipment for separating liquid from solid, 4-biological filter II, 5-second by-pass valve control, 6-first by-pass valve control, 7-aeration interface I, 8-water outlet I, 9-the 3rd by-pass valve control, 10-the 5th by-pass valve control, 11-the 6th by-pass valve control, 12-the 4th by-pass valve control, 13-water outlet II, 14-aeration interface II, 15-the 7th by-pass valve control, 16-the 8th by-pass valve control, 17-dosing mouth, 18-water inlet pipe.
Fig. 2 is the removal of Phosphorus From Wastewater of the present invention and the schematic circuit of recovery system.
Embodiment
According to Fig. 1, a kind of removal of Phosphorus From Wastewater and recovery system, comprise biological filter I (1), biological filter II (4), crystallizing pond (2) and equipment for separating liquid from solid (3), water inlet pipe (18) is connected with biological filter I (1) and biological filter II (4) respectively, water inlet pipe near biological filter I (1) there is the first by-pass valve control (6), the water inlet pipe near biological filter II (4) has the second by-pass valve control (5); Biological filter I (1) is connected by pipeline with crystallizing pond (2), pipeline has the 5th by-pass valve control (10), biological filter II (4) is connected by pipeline with crystallizing pond (2), and pipeline has the 6th by-pass valve control (11); Dosing mouth (17) is arranged at the bottom of crystallizing pond (2), and crystallizing pond (2) is connected by the bottom of pipeline with equipment for separating liquid from solid (3); Biological filter I (1) water-in is connected with equipment for separating liquid from solid (3) by pipeline, and pipeline has the 7th by-pass valve control (15); Biological filter II (4) water-in is connected with equipment for separating liquid from solid (3) by pipeline, and pipeline has the 8th by-pass valve control (16).Aeration interface I(7 is arranged at bottom, described biological filter I (1)), water outlet I(8 is arranged at top), water outlet I(8) pipeline there is the 3rd by-pass valve control (9).
Aeration interface II (14) is arranged at bottom, biological filter II (4) of the present invention, and water outlet II (13) is arranged at top, water outlet II (13) has the 4th by-pass valve control (12).Described dosing mouth (17) distance 200mm place, crystallizing pond (2) bottom.
According to Fig. 2, the removal of Phosphorus From Wastewater of the present invention and the method for recovery comprise the steps:
(1) natural membrane is carried out to biological filter I and biological filter II, after natural membrane success, containing abundant poly-phosphorus bacteria in two groups of biological filters;
(2) power switch S is closed
1, open power switch S
2close the second by-pass valve control (5), the 3rd by-pass valve control (9), the 4th by-pass valve control (12), the 5th by-pass valve control (10), the 6th by-pass valve control (11), the 7th by-pass valve control (15) and the 8th by-pass valve control (16), open the first by-pass valve control (6), waste water flows into biological filter I (1) from water inlet pipe (18), close aeration interface I(7), biological filter I (1) is regulated to be anaerobic biofilter, dissolved oxygen is less than 0.5mg/L, pH controls at 7.5-8.0, temperature is at 18-30 DEG C, hydraulic detention time 2h, releases phosphorus treating processes.
(3) the 5th by-pass valve controls (10) are opened, waste water after step (2) process is flowed into crystallizing pond (2) and carries out crystallization reaction process, in crystallizing pond (2), medicament is added by dosing mouth (17), the medicament added is magnesium salts, the mol ratio of magnesium salts and phosphorus controls at 1.0:1.0-1.0:3.0, environment pH is 7.5-8.0, waste water in crystallizing pond (2) is applied to the ultrasonic power of 150w/L, hydraulic detention time controls as 1h, medicament and waste water are fully mixed in crystallizing pond, crystallization nucleation developmental process occurs;
(4) waste water after step (3) process is flowed into equipment for separating liquid from solid (3), equipment for separating liquid from solid (3) adopts the mode to upper reaches, the crystal continued growth that step (3) produces, hydraulic detention time is 6h, crystal settling is in equipment for separating liquid from solid (3) bottom, the 18 hours waste water in interval is discharged, and is separated crystal in waste water.
(5) the 8th by-pass valve controls 16 are opened, the waste water that step (4) is discharged flows into biological filter II (4), open aeration interface II (13), biological filter II (4) is regulated to be aerobic biofilter: the dissolved oxygen content 3-5mg/L regulating aerobic biofilter, pH=7.1-7.8, hydraulic detention time is 2h, and temperature is 18-30 DEG C; Carry out suction phosphorus treating processes, the waste water after inhaling phosphorus process reaches emission standard, and open the 4th by-pass valve control 12, waste water is discharged by the water outlet II (13) on top, biological filter II (4).
After the poly-phosphorus bacteria suction phosphorus in biological filter II (4) in step (5) is saturated, carry out step below:
A () is after the poly-phosphorus bacteria suction phosphorus in biological filter II is saturated, water outlet phosphorus concentration raises, and biological filter II aeration interface is closed, biological filter II is adjusted to anaerobic biofilter, biological filter I aeration interface is opened, biological filter I is adjusted to aerobic biofilter;
B () opens power switch S
1, close power switch S
2close the first by-pass valve control (6), the 3rd by-pass valve control (9), the 4th by-pass valve control (12), the 5th by-pass valve control (10), the 6th by-pass valve control (11), the 7th by-pass valve control (15) and the 8th by-pass valve control (16), open the second by-pass valve control (5), waste water flows into biological filter II (4) from water inlet pipe (18), biological filter II (4) dissolved oxygen is less than 0.5mg/L, pH controls 7.5 ~ 8.0, and temperature is at 18 ~ 30 DEG C; Release phosphorus treating processes;
C () opens the 6th by-pass valve control (11), waste water after step (b) process is flowed into crystallizing pond (2) and carries out crystallization reaction process, in crystallizing pond (2), medicament is added by dosing mouth (17), interpolation medicament is magnesium salts, the mol ratio of magnesium salts and phosphorus controls at 1.0:1.0-1.0:3.0, environment pH is 7.5-8.0, the waste water of crystallizing pond (2) is applied to the ultrasonic power of 150w/L, and hydraulic detention time controls as 1h; Medicament and waste water are fully mixed in crystallizing pond, crystallization nucleation developmental process occurs;
D waste water after step (c) process is flowed into equipment for separating liquid from solid (3) by (), equipment for separating liquid from solid (3) adopts the mode to upper reaches, the crystal continued growth that step (c) produces, hydraulic detention time is 6h, crystal settling is bottom equipment for separating liquid from solid 3, the 18 hours waste water in interval is discharged, and is separated crystal in waste water.
E () opens the 7th by-pass valve control (15), the waste water that step (d) is discharged flows into biological filter I (1), opens aeration interface I(7), the dissolved oxygen content 3-5mg/L of biological filter I (1), pH=7.1-7.8, hydraulic detention time is 2h, and temperature is 18-30 DEG C.; Carry out suction phosphorus treating processes, the waste water after inhaling phosphorus process reaches emission standard, opens the 3rd by-pass valve control (9), and waste water is by the water outlet I(8 on top, biological filter I (1)) discharge.
After the poly-phosphorus bacteria suction phosphorus in biological filter I (1) in step (e) is saturated, repeat above-mentioned steps (2) to (5).
Waste water after treatment, water outlet phosphorus concentration is less than 0.5mg/L, can reach the emission standard " urban wastewater treatment firm pollutant emission standard (GB18918-2002) " of one-level A.
Claims (9)
1. the removal of a Phosphorus From Wastewater and recovery system, it is characterized in that: comprise biological filter I, biological filter II, crystallizing pond and equipment for separating liquid from solid, water inlet pipe is connected with biological filter I and biological filter II respectively, water inlet pipe near biological filter I there is the first by-pass valve control, the water inlet pipe near biological filter II has the second by-pass valve control; Biological filter I is connected by pipeline with crystallizing pond, and pipeline has the 5th by-pass valve control, and biological filter II is connected by pipeline with crystallizing pond, and pipeline has the 6th by-pass valve control; Dosing mouth is arranged at the bottom of crystallizing pond, and crystallizing pond is connected with the bottom of equipment for separating liquid from solid by pipeline; Biological filter I water-in is connected with equipment for separating liquid from solid by pipeline, and pipeline has the 7th by-pass valve control; Biological filter II water-in is connected with equipment for separating liquid from solid by pipeline, and pipeline has the 8th by-pass valve control.
2. the removal of Phosphorus From Wastewater according to claim 1 and recovery system, is characterized in that: aeration interface I is arranged at bottom, described biological filter I, and water outlet I is arranged at top, water outlet I pipeline has the 3rd by-pass valve control.
3. the removal of Phosphorus From Wastewater according to claim 1 and recovery system, is characterized in that: aeration interface II is arranged at bottom, described biological filter II, and water outlet II is arranged at top, water outlet II has the 4th by-pass valve control.
4. the removal of Phosphorus From Wastewater according to claim 1 and recovery system, is characterized in that: described dosing mouth distance 200mm place, crystallizing pond bottom.
5. the removal of Phosphorus From Wastewater and a recovery method, is characterized in that: comprise the steps:
(1) natural membrane is carried out to biological filter I and biological filter II, after natural membrane success, containing abundant poly-phosphorus bacteria in two groups of biological filters;
(2) waste water flows into biological filter I from water inlet pipe, close biological filter I aeration interface, biological filter I is anaerobic biofilter, the dissolved oxygen content of biological filter I is less than 0.5mg/L, pH controls at 7.5-8.0, temperature is at 18-30 DEG C, and hydraulic detention time 2h, COD volumetric loading is at 90-120g/ (m
3filtrate d) carry out releasing phosphorus treating processes;
(3) waste water after step (2) process flows into crystallizing pond and carries out crystallization reaction process, in crystallization reaction pond, add medicament, environment pH is 7.5-8.0, and medicament and waste water fully mix in crystallizing pond, the waste water of crystallizing pond is applied to the ultrasonic power of 150w/L, hydraulic detention time controls as 1h;
(4) waste water after step (3) process flows into equipment for separating liquid from solid, crystal continued growth, and sedimentation time is 6h, and crystal settling is bottom equipment for separating liquid from solid, and every 3 cycles of operation discharge accumulation crystal;
(5) waste water that step (4) is discharged flows into biological filter II, open biological filter II aeration interface, biological filter II is regulated to be aerobic biofilter, its dissolved oxygen content 3-5mg/L, pH=7.1-7.8, hydraulic detention time is 2h, temperature is 18-30 DEG C, carry out suction phosphorus treating processes, the waste water after inhaling phosphorus process reaches emission standard, and waste water is discharged.
6. the removal of a kind of Phosphorus From Wastewater according to claim 5 and recovery method, is characterized in that: also comprise the steps:
A (), after the poly-phosphorus bacteria suction phosphorus in biological filter II is saturated, water outlet phosphorus concentration raises, and biological filter II is adjusted to anaerobic biofilter, biological filter I is adjusted to aerobic biofilter;
B () waste water flows into biological filter II from water inlet pipe, the dissolved oxygen content of biological filter II is less than 0.5mg/L, and pH controls at 7.5-8.0, and temperature is at 18-30 DEG C, and hydraulic detention time 2h, COD volumetric loading is at 90-120g/ (m
3filtrate d) carry out releasing phosphorus treating processes;
C the waste water after () step (b) process flows into crystallizing pond and carries out crystallization reaction process, in crystallization reaction pond, add medicament, environment pH is 7.5-8.0, and medicament and waste water fully mix in crystallizing pond, the waste water of crystallizing pond is applied to the ultrasonic power of 150w/L, hydraulic detention time controls as 1h;
D the waste water after () step (c) process flows into equipment for separating liquid from solid, crystal continued growth, sedimentation time is 6h, and crystal settling is bottom equipment for separating liquid from solid, and every 3 cycles of operation discharge accumulation crystal;
E waste water that () step (d) discharges flows into the dissolved oxygen content 3-5mg/L of biological filter I, biological filter IR, pH=7.1-7.8, hydraulic detention time is 2h, and temperature is 18-30 DEG C, carries out suction phosphorus treating processes, waste water after inhaling phosphorus process reaches emission standard, and waste water is discharged;
After the poly-phosphorus bacteria suction phosphorus in the I of biological filter is saturated, water outlet phosphorus concentration raises, and biological filter I is adjusted to anaerobic biofilter, biological filter II is adjusted to aerobic biofilter, repeats the step (2) of claim 5 to (5).
7. the removal of a kind of Phosphorus From Wastewater according to claim 5 and recovery method, it is characterized in that: the medicament added in described step (3) is magnesium salts, the mol ratio of magnesium salts and phosphorus is 1.0:1.0-1.0:3.0.
8. the removal of a kind of Phosphorus From Wastewater according to claim 6 and recovery method, it is characterized in that: the medicament added in described step (c) is magnesium salts, the mol ratio of magnesium salts and phosphorus is 1.0:1.0-1.0:3.0.
9. the removal of a kind of Phosphorus From Wastewater according to claim 6 and recovery method, it is characterized in that: described biological filter II is adjusted to anaerobic biofilter, namely be that biological filter II aeration interface is closed, described biological filter I being adjusted to aerobic biofilter, is namely that biological filter I aeration interface is opened.
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| CN112779021A (en) * | 2021-02-03 | 2021-05-11 | 中南大学 | Phosphorus-containing heavy metal contaminated soil remediation material and preparation method and application thereof |
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| CN104609653B (en) | 2017-02-22 |
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