CN102951763A - Method for utilizing pre-depositing magnetic separation combined technology to treat municipal wastewater - Google Patents
Method for utilizing pre-depositing magnetic separation combined technology to treat municipal wastewater Download PDFInfo
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- CN102951763A CN102951763A CN2012104835487A CN201210483548A CN102951763A CN 102951763 A CN102951763 A CN 102951763A CN 2012104835487 A CN2012104835487 A CN 2012104835487A CN 201210483548 A CN201210483548 A CN 201210483548A CN 102951763 A CN102951763 A CN 102951763A
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Abstract
The invention relates to the field of wastewater treatment and especially relates to a method for utilizing a pre-depositing magnetic separation combined technology to treat municipal wastewater. The method comprises the following steps: pouring the wastewater into a pre-depositing system, primarily separating the wastewater from activated sludge and depositing 80-90% of activated sludge in the pre-depositing system; causing effluent to enter into a magnetic separation system; causing small sludge clusters in the wastewater to form micro-magnetic flocculation by adding micro-magnetic flocculation agent; utilizing a magnetic separation device to perform muddy water separation; and after disinfecting the effluent of the magnetic separation device, recycling or draining the effluent. The pre-depositing system is a manmade depositing system and comprises a water distributing unit, a depositing area, a sludge backflow area and a water draining unit. The method has the advantages of high separating speed, small floor space, strong resistance to an impact load, and the like.
Description
Technical field
The present invention relates to field of waste water treatment, relate in particular to the method that adopts preliminary sedimentation to process municipal wastewater in conjunction with magnetic separation technique.
Background technology
In recent years, the outstanding problem that has become puzzlement China socio-economic development in short supply of water resources.In populous city, be the high-pressure of water resources on the one hand especially, another reverse side is to have produced a large amount of sewage in producing, living to cause serious threat to ecotope.Waste water is back to production system or life after processing up to standard and Treatment for Reuse use mixedly and be called as reusing sewage.Limited and Freshwater resources preciousness namely can be saved and utilize to reusing sewage effectively, can reduce the quantity discharged of sewage or waste water, alleviate the pollution of water surrounding, can also slow down the excess load phenomenon of urban discharging pipeline, have obvious social benefit, environmental benefit and economic benefit.
Municipal wastewater is the general designation that city and cities and towns enter the water of sewerage system, comprises sanitary sewage, factory effluent.The amount of municipal wastewater is generally larger, can reach more than ton every day.Generally reach after treatment country-level or secondary discharge standard, enter river course or ocean.Municipal effluent reduces urban water resource and pollutes significant for alleviating the shortage of lack of water city water resource.
Second pond is the important component part of municipal wastewater treatment plant Sludge System, it acts on main mud and separates, make clarification of water and carry out mud and concentrate, it is the requisite link of traditional activated sludge process, for guaranteeing that effluent quality is significant, but the shortcomings such as existence is taken up an area large, and effluent quality is relatively poor.
In China, the water environment capacity of municipal wastewater treatment plant is all larger, and day output does not wait to the hundreds of thousands of ton several ten thousand.According to the environmental protection policy of country, require each district all should build urban wastewater treatment firm.Along with city extension, an inch of land is an inch of gold, no matter newly-built municipal wastewater treatment plant or sewage work's dilatation all may face and take up an area problem in short supply or that expropriation of land is difficult.In addition, carry mark and transform and to require each subsequent disposal workshop section of municipal wastewater treatment plant to strengthen at aspects such as denitrogenation dephosphorizing turbidity removals processing, each large scientific research institutions and enviromental protection enterprise all efficient in active research, take up an area the technique of economizing.
Summary of the invention
In view of there is above-mentioned weak point in prior art, the invention provides and adopt preliminary sedimentation in conjunction with the method for magnetic separation technique processing municipal wastewater, this treatment process is that waste water enters pre-sinking system, waste water carries out preliminary separating with active sludge, and the active sludge of 80-90% precipitates in pre-sinking system; Water outlet enters magnetic separation system, by adding little magnetic flocculation medicament, makes the tiny mud group in the waste water form little magnetic floc sedimentation, then carries out mud-water separation by magnetic separating apparatus, the magnetic separating apparatus water outlet through sterilization after reuse or efflux; Described pre-sinking system is a settling system of manually constructing, and comprising: water distribution unit, settling region, sludge reflux district, water unit.
Further, described settling region is radical sedimentation basin.
Further, in the described pre-sinking system, waste water and active sludge carry out preliminary disengaging time 10 min-30min, water outlet sludge concentration≤500mg/L.
Further, in the described pre-sinking system, the hydraulic surface loading span is 2.0 ~ 2.5m
3/ (m
2.h), residence time value is 25 ~ 40min.
Further, described magnetic separating apparatus is disk.
Further, the hydraulic detention time 2-5min of described magnetic separating apparatus.
Further, before the method that adopts preliminary sedimentation in conjunction with magnetic separation technique processing municipal wastewater, can also carry out pre-treating technology to waste water, described pre-treating technology refers to biochemical treatment.
Compared with prior art, advantage of the present invention is:
1, velocity of separation is fast, and floor space is little, and treatment process of the present invention treatment time≤30 minute are taken up an area than traditional second pond and saved 30%.
2, preliminary sedimentation system surfaces hydraulic load is large, and the hydraulic load interval is 2.0 ~ 2.5 m
3/ (m
2.h), compare common 1.0 ~ 1.5 m of municipal sewage work
3/ (m
2.h) hydraulic load promotes about 2 times, and the residence time shortens 75%.
3, anti-shock loading is strong, can lignin-sludge concentration be the front-end process water outlet of 2000-4000mg/L, by the control to the stage pharmaceutical quantities, can effectively control outlet effect, stable effluent quality.
4, the present invention fully keeps the advantage of magnetic separation technique efficient dephosphorization, compares two traditional pond settling tanks, and phosphor-removing effect is better.
5, treatment process of the present invention is simple to operate, is easy to administer and maintain, and has alleviated operator's labour intensity.
6, process system noiseless without obvious stink, does not affect surrounding enviroment.
The effect of the pre-sinking system of the present invention mainly is that active sludge is carried out preliminary precipitation, removes the mud that wherein most particle diameters are large, sedimentation speed is fast, reduces the processing load of rear end magnetic separating apparatus.
The water that comes of front end enters pre-sinking system, and waste water carries out preliminary separating with active sludge, guarantees to enter the sludge concentration≤500mg/L of magnetic separation system, and the active sludge of 80-90% precipitates in this system; The preliminary sedimentation tank water outlet enters magnetic separating apparatus, by adding little magnetic flocculation medicament, make the little magnetic floc sedimentation of tiny mud group's formation in the waste water, then carry out mud-water separation by magnetic separating apparatus, reach the purpose of removing suspended substance (SS), total phosphorus (TP) and part COD in the water, the magnetic separating apparatus water outlet through sterilization after reuse or efflux.
Description of drawings
Fig. 1 is the subsidence curve of sludge concentration when being 3927 mg/L;
Fig. 2 is the subsidence curve of sludge concentration when being 2426 mg/L;
Fig. 3 is the sludge settling curve of settling box water-feeding deep when being 180cm.
Embodiment
In determining technical scheme process of the present invention, contriver's design has also been implemented series of experiments, and carried out on-the-spot lab scale on the laboratory study basis.Particular case is as follows: mainly consider following condition: the determining etc. of the value of the selection of settling tank type, settling tank surface load, the selection of the settling tank residence time, magnetic separating apparatus added amount of chemical.
1. the selection of settling tank type
Settling tank can be divided into the types such as rectangular sedimentation tank, radical sedimentation basin and vertical sedimentation basin according to the difference of pool inner water flow path direction, and every kind of settling tank has its relative merits.
Through the contrast to three kinds of multi-form settling tank process characteristics and usable condition, in conjunction with the present invention, according to factors such as the complexity of processing the water yield, management, occupations of land, the settling region is that Zhou Jinzhou goes out radical sedimentation basin.
2. the selection of preliminary sedimentation system surfaces hydraulic load
The sludge settling type of municipal wastewater treatment system can be used to explain the operating mode of its settling tank and concentration basin for crowded and compression precipitating by drawing its settling curve.Therefore design and produce crowded and compression testing settling box, carried out on-the-spot sludge settling experiment in different municipal wastewater treatment plants, the settling box external diameter is 100mm, highly is 2000mm.The water inlet of its second pond is entered in the column precipitator with infusion, evenly after, begin to calculate, and take the time as X-coordinate, the sludge interface height is ordinate zou, draws settling curve.Carrying out two groups of experiments respectively, sludge concentration is respectively 3927 mg/L and 2426 mg/L, and the experiment knot is shown in following table 1 and table 2:
Sludge interface height under the different sedimentation time of table 1 (water inlet SS:3927 mg/L)
| Time (min) | Mud layer height (cm) | Heavy speed (m/h) | Time (min) | Mud layer height (cm) | Heavy speed (m/h) |
| 0 | 184 | / | 17.33 | 120 | 2.00 |
| 1.83 | 180 | 1.31 | 18.88 | 115 | 1.94 |
| 3.07 | 175 | 2.42 | 20.42 | 110 | 1.95 |
| 4.35 | 170 | 2.34 | 22 | 105 | 1.90 |
| 5.63 | 165 | 2.34 | 23.83 | 100 | 1.64 |
| 6.93 | 160 | 2.31 | 25.83 | 95 | 1.50 |
| 8.2 | 155 | 2.36 | 28.17 | 90 | 1.28 |
| 9.45 | 150 | 2.40 | 34.91 | 80 | 0.89 |
| 10.67 | 145 | 2.46 | 44.15 | 70 | 0.65 |
| 11.83 | 140 | 2.59 | 56.5 | 60 | 0.49 |
| 13.18 | 135 | 2.22 | 77.3 | 50 | 0.29 |
| 14.55 | 130 | 2.19 | 118.5 | 40 | 0.15 |
| 15.83 | 125 | 2.34 | / | / | / |
Sludge interface height under the different sedimentation time of table 2 (water inlet SS:2426 mg/L)
| Time (min) | Mud layer height (cm) | Heavy speed (m/h) | Time (min) | Mud layer height (cm) | Heavy speed (m/h) |
| 0 | 186 | 8.6 | 120 | 5.26 | |
| 1.65 | 180 | 2.18 | 9.2 | 115 | 5.00 |
| 2.33 | 175 | 4.41 | 9.75 | 110 | 5.45 |
| 2.85 | 170 | 5.77 | 10.37 | 105 | 4.84 |
| 3.24 | 165 | 7.69 | 10.98 | 100 | 4.92 |
| 3.96 | 160 | 4.17 | 11.62 | 95 | 4.69 |
| 4.5 | 155 | 5.56 | 13.03 | 90 | 2.13 |
| 5.47 | 150 | 3.09 | 15.02 | 80 | 3.02 |
| 5.97 | 145 | 6.00 | 18.33 | 70 | 1.81 |
| 6.47 | 140 | 6.00 | 25.85 | 60 | 0.80 |
| 6.97 | 135 | 6.00 | 39.42 | 50 | 0.44 |
| 7.47 | 130 | 6.00 | 77 | 30 | 0.32 |
According to interpretation, table 1-2, Fig. 1-2 show, the precipitation of mud can be divided into constant speed settling region, transition zone and compression zone, the sedimentation speed in the constant speed settling region of mud is the fastest, simultaneously, the water inlet sludge concentration is larger on the impact of the settling velocity of mud: be in the situation of 3927mg/L in sludge concentration, be up to 2.59 m/h, be in the situation of 2426 mg/L in sludge concentration, be up to 6.00 m/h.
The contriver if namely keep mud that effect of settling is arranged, also needs to consider the shock resistance of preliminary sedimentation tank through repeatedly experiment, and the highest hydraulic load should＜2.59 m
3/ (m
2.h), interval is 2.0 ~ 2.5 m
3/ (m
2.h).
3. the selection of the pre-sinking system residence time
By the subsidence curve of said determination active sludge, determined the fastest settling velocity of mud in the free setting district, can judge the maximized surface load of pre-sinking system.In order to verify the mud clearance that sinks in advance under different sedimentation time, the different reflux ratio, carried out static sedimentation experiment.It is 100mm that diameter is adopted in this experiment, it highly is the settling box of 2000mm, active sludge is injected settling box, begin simultaneously the precipitation experiment, it is h1, h2, h3 that sampling spot is separately positioned on the depth of water ... the hn place, be t1, t2, t3 in sedimentation time ... ..tn the time, in settling box, take out respectively the whole water samples more than the sampling spot, analyze concentration of suspension C1, C2, the C3 of each water sample ... .Cn, then in the case, mud clearance under this sedimentation time is (C0-Cn)/C0*100%, and the Inlet and outlet water ratio is R=2000/hn*100%.Under certain sampling height, take sample time as X-coordinate, draw the settling curve figure of mud take the water outlet sludge concentration as ordinate zou, then can simulate in certain return sludge ratio situation, mud clearance situation under the different sedimentation time is shown in experimental result Fig. 3.
According to experimental result, when the water inlet sludge concentration is 2426mg/L, the above average sludge concentration in depth of water 90cm interface is respectively 1620mg/L when the residence time is 5min, 10min, 20min, 30min, 40min, 1326 mg/L, 42 mg/L, 29.5 mg/L, 23.2 mg/L, realize water outlet sludge concentration≤500 mg/L, then the residence time is about 15min.
Other experiments also show, when the water inlet sludge concentration is 3927mg/L, realize sludge concentration≤500 mg/L, and the residence time is about 25min.In order to keep mud that effect of settling is arranged, consider simultaneously the shock resistance of preliminary sedimentation tank, the residence time answers 〉=25min, and interval is 25 ~ 40min.
The effect of the pre-sinking system of the present invention mainly is that active sludge is carried out preliminary precipitation, removes the mud that wherein most particle diameters are large, sedimentation speed is fast, reduces the processing load that the super magnetic in rear end separates waste water purification system.
For ease of to the present invention to further understanding, describe below by embodiment.
Embodiment 1
Certain municipal wastewater is processed engineering, treatment scale 25000m
3/ d, biochemical treatment is oxidation ditch process, and oxidation ditch process water outlet sludge concentration is 3753mg/L, and total phosphorus is 1.64 mg/L, and gravity flow enters pre-sinking system, and the hydraulic surface loading value of pre-sinking system is 2.4 m
3/ m
2.h, hydraulic detention time is 25min, and pre-sinking system water outlet sludge concentration is 376mg/L, and going out the sewage sludge clearance is 89.9%.Pre-sinking system water outlet enters magnetic separation system, successively adds magnetic and the mixed flocculation of little magnetic medicament in the magnetic separation system, forms flco, after magnetic separated the waste water purification system separation, going out water suspension was 7 mg/L, and total phosphorus is 0.31mg/L, total tp removal rate is 81.1%, and water outlet is through discharging after sterilizing.From the coagulation to the separation, whole process is lasted 3 minutes.The contained magnetic of mud is recycling after reclaiming, and the rate of recovery reaches 98.5%.
Preliminary sedimentation is in conjunction with magnetic separating treatment technique total residence time≤30min, and stable water outlet reaches the one-level A standard among " urban wastewater treatment firm pollutant emission standard " GB18918-2002, and the processing water yield is 25000m
3/ d compares traditional secondary sedimentation basins saving and takes up an area approximately 35.8%, and the residence time shortens about 3/4, and processing efficiency significantly improves.
Embodiment 2
Certain municipal wastewater is processed engineering, treatment scale 48000m
3/ d, biochemical treatment is AAo (anaerobic-anoxic-oxic method) technique, and biochemical treatment system water outlet sludge concentration is 2813mg/L, and total phosphorus is 1.09mg/L.Waste water flows to into pre-sinking system through biochemical treatment, and pre-sinking system sedimentation time is 20min, and hydraulic surface loading is 2.7m
3/ m
2.h, preliminary sedimentation water outlet sludge concentration is 256 mg/L, and going out the sewage sludge clearance is 90.9%.Then enter magnetic separation system, successively add the mixed flocculation of magnetic and little magnetic medicament, form flco, after magnetic separated the waste water purification system separation, going out water suspension was 8 mg/L, and total phosphorus is 0.27 mg/L, total tp removal rate is 75.2%, and water outlet is through discharging after sterilizing.From the coagulation to the separation, whole process is lasted 3 minutes.The contained magnetic of mud is recycling after reclaiming, and the rate of recovery reaches 98.7%.
Preliminary sedimentation is in conjunction with magnetic separating treatment technique total residence time≤30min, and stable water outlet reaches the one-level A standard among " urban wastewater treatment firm pollutant emission standard " GB18918-2002, and the processing water yield is 48000m
3/ d compares traditional secondary sedimentation basins saving and takes up an area approximately 39.8%, and the residence time shortens about 3/4, and processing efficiency significantly improves.
Claims (7)
1. adopt preliminary sedimentation to process the method for municipal wastewater in conjunction with magnetic separation technique, it is characterized in that, this treatment process is, waste water enters pre-sinking system, and waste water carries out preliminary separating with active sludge, and the active sludge of 80-90% is precipitating in pre-sinking system; Water outlet enters magnetic separation system, by adding little magnetic flocculation medicament, makes the tiny mud group in the waste water form little magnetic floc sedimentation, then carries out mud-water separation by magnetic separating apparatus, the magnetic separating apparatus water outlet through sterilization after reuse or efflux; Described pre-sinking system is a settling system of manually constructing, and comprising: water distribution unit, settling region, sludge reflux district, water unit.
2. employing preliminary sedimentation as claimed in claim 1 is in conjunction with the method for magnetic separation technique processing municipal wastewater, and it is characterized in that: described settling region is radical sedimentation basin.
3. employing preliminary sedimentation as claimed in claim 1 is in conjunction with the method for magnetic separation technique processing municipal wastewater, and it is characterized in that: in the described pre-sinking system, waste water and active sludge carry out preliminary disengaging time 10 min-30min, water outlet sludge concentration≤500mg/L.
4. such as the method for each described employing preliminary sedimentation of claim 1-3 in conjunction with magnetic separation technique processing municipal wastewater, it is characterized in that: in the described pre-sinking system, the hydraulic surface loading span is 2.0 ~ 2.5m
3/ (m
2.h), residence time value is 25 ~ 40min.
5. employing preliminary sedimentation as claimed in claim 4 is in conjunction with the method for magnetic separation technique processing municipal wastewater, and it is characterized in that: described magnetic separating apparatus is disk.
6. employing preliminary sedimentation as claimed in claim 5 is characterized in that: the hydraulic detention time 2-5min of described magnetic separating apparatus in conjunction with the method for magnetic separation technique processing municipal wastewater.
7. employing preliminary sedimentation as claimed in claim 6 is processed the method for municipal wastewater in conjunction with magnetic separation technique, it is characterized in that: before the method that adopts preliminary sedimentation in conjunction with magnetic separation technique processing municipal wastewater, can also carry out pre-treating technology to waste water, described pre-treating technology refers to biochemical treatment.
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Cited By (5)
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| CN103232132A (en) * | 2013-03-25 | 2013-08-07 | 四川环能德美科技股份有限公司 | Magnetic separation method and apparatus for mine water underground treatment |
| CN103241890A (en) * | 2013-05-24 | 2013-08-14 | 北京科技大学 | Method for processing chromium-containing tanning wastewater by using magnetic coagulation method |
| CN103351083A (en) * | 2013-07-23 | 2013-10-16 | 江苏天鑫中冶环保设备有限公司 | Mobile water body purification system |
| CN109437495A (en) * | 2018-12-27 | 2019-03-08 | 广东海源环保科技有限公司 | A kind of non-halt production municipal wastewater processing line and non-halt production renovation technique |
| CN110294574A (en) * | 2019-07-16 | 2019-10-01 | 安徽国祯环保节能科技股份有限公司 | A kind of method that biochemical method sewage treatment process reduces secondary settling tank area |
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| CN103232132A (en) * | 2013-03-25 | 2013-08-07 | 四川环能德美科技股份有限公司 | Magnetic separation method and apparatus for mine water underground treatment |
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| CN109437495A (en) * | 2018-12-27 | 2019-03-08 | 广东海源环保科技有限公司 | A kind of non-halt production municipal wastewater processing line and non-halt production renovation technique |
| CN110294574A (en) * | 2019-07-16 | 2019-10-01 | 安徽国祯环保节能科技股份有限公司 | A kind of method that biochemical method sewage treatment process reduces secondary settling tank area |
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Application publication date: 20130306 |