CN104817224A - Sewage phosphate removing method by breaking wall, backflowing and adding ferric salt - Google Patents
Sewage phosphate removing method by breaking wall, backflowing and adding ferric salt Download PDFInfo
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- CN104817224A CN104817224A CN201510166149.1A CN201510166149A CN104817224A CN 104817224 A CN104817224 A CN 104817224A CN 201510166149 A CN201510166149 A CN 201510166149A CN 104817224 A CN104817224 A CN 104817224A
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Abstract
The invention relates to a sewage phosphate removing method by breaking wall, backflowing and adding ferric salt; which is characterized in that a slush mixture discharged from a sewage biological treatment system is separated in a sedimentation basin, sludge is performed with wall breaking treatment through supersonic wave; the sludge after wall breaking treatment is returned to an anaerobic or anoxic treatment unit inlet end of the sewage biological treatment for processing; ferric salt is added at an outlet end of an anaerobic or anoxic treatment unit and is mixed with sludge or a supernatant, then deposited and separated, phosphate removing is carried out, wall breaking is carried out on the residual sludge through supersonic wave, sludge EPS is dissolved, a dissolving liquid performs backflow to a biological treatment unit for providing carbon source for the unit and increasing the phosphate removing effect, and ferric salt is added so that a mode for phosphate removing by ferric salt can ensure that phosphor content in sewage can reach a standard discharge. The method can realize quantitative reduction and resource utilization on sludge, and provides necessary carbon source for the biological treatment unit, phosphate removing is carried out by cooperating with a few of ferric salt, so that cost is greatly reduced under prerequisite that a processing target is satisfied.
Description
Technical field
The present invention relates to a kind of to sewage work produce excess sludge carry out broken wall backflow after, with a certain amount of molysite jointly to the method for sewage dephosphorization, particularly relate to a kind of ultrasonic wave and mud broken wall minimizing resource utilization is gone forward side by side the method for working in coordination with molysite and carrying out sewage dephosphorization.
Background technology
Along with day by day appearing suddenly of body eutrophication problem, the raising of Public Environmental Awareness, sewage denitrification and dephosphorization problem becomes the focus of extensive concern in water pollution control.The urban wastewater treatment firm pollutant emission standard (GB18918-2002) of the up-to-date promulgation of China has clear stipulaties wherein to phosphorus discharge: wherein the discharge of phosphorus (in orthophosphoric acid salt) will be strict controlled in 0.5mg/L (one-level A standard) and 1mg/L (one-level B standard) below, and this represents sewage work must adopt dephosphorization process.
Biological phosphate-eliminating technology is owing to having the advantages such as remove C, N, P and processing cost is low and being used widely simultaneously, but want to reach water outlet phosphorus content <1mg/L, must ensure that the ratio of solvability BOD and TP in former water is more than or equal to 15, and organic content is lower in fact current China municipal wastewater, and carbon source deficiency causes whole system dephosphorization efficiency by using not good.For this reason, since the eighties in 20th century, carry out large quantifier elimination abroad, proposed in sewage, add methyl alcohol (being called additional organic carbon source), and be applied to engineering practice.Although additional organic carbon source facilitates the effect of biological phosphate-eliminating, running cost is also corresponding to be increased considerably, and is difficult in China's penetration and promotion.And set up primary sludge fermentation pond in some sewage works, fermentation vat supernatant liquor is utilized to carry out the deficiency of supplementary former Organic substance in water content, but because primary sludge hydrolysed ferment needs comparatively long residence time, fermentation vat is volume required larger, and organic matter degradation process is also wayward in the hydrolysed ferment stage, this method making up carbon source deficiency is made to be difficult to receive the effect of anticipation.Therefore, quick alternative organic carbon source one of study hotspot becoming biological removal of phosphorus in wastewater is found.
And, the excess sludge problem of sewage work is currently subject to extensive concern and one of important environmental problem in the urgent need to address, Sources decreasing is the important channel solving sludge problem, develops the technology tool be combined with biological phosphate-eliminating based on Sludge Reduction Technologies for this reason and is of great significance.Consider that carbon source in current many municipal effluents is not enough, limit the removal to nitrogen and phosphorus thing, and the C/N value of cellular material is higher than existing many municipal effluents, therefore after cell wall breaking, the cellular material of stripping can be used as the carbon source of biological carbon and phosphorous removal.With this, have developed, with ultrasonic wave, broken wall is carried out to excess sludge, mud after broken wall is as the carbon source of biological processing unit, after being back to anaerobism or anoxic unit process, at the exit end of anaerobism or anoxic unit, by its mud mixture after precipitate and separate, in supernatant liquor, add molysite mixing, and by precipitate and separate, obtain the sewage after further dephosphorization.The present invention not only effectively decreases sludge yield, turn increases phosphor-removing effect, and a small amount of molysite added can ensure phosphor-removing effect, compares other techniques and effectively reduces cost of investment.
Summary of the invention
The present invention relates to a kind of supersonic wave wall breaking backflow is carried out to excess sludge after coordinate the mode adding molysite to the method for sewage dephosphorization, sewage work produces a large amount of mud every day, mud is made up of microorganism and extracellular polymeric (EPS) etc., it is 50-60% that EPS accounts for mud, EPS is organic chief component in active sludge, and wherein the composition of EPS mainly comprises polysaccharide, protein and a small amount of soil ulmin.Carry out process with ultrasonic wave can efficiently and at low cost EPS be dissolved, obtain the mud lysate that carbon content is higher; Be back to biological phosphate-eliminating treatment system, as anaerobism or the anaerobic treatment unit inlet end of biological sewage treatment, can phosphor-removing effect be promoted, realize sludge reduction simultaneously.For avoiding only occurring with situations such as biological phosphate-eliminating generation treatment effect instability, this invention coordinates sewage dephosphorization to add a small amount of molysite, effectively can ensure the normal operation of sewage work's dephosphorization work, other dephosphorization modes before comparing, significantly can reduce dephosphorization agent dosage and excess sludge treatment capacity, decrease cost of investment.
The present invention adopts following technical scheme to realize:
The backflow of mud broken wall adds the method that molysite carries out sewage dephosphorization, is at least made up of following process:
(1), after the mud mixture that sewage biological treatment system is discharged is separated in settling tank, mud is carried out broken wall treatment with ultrasonic wave;
(2) mud after broken wall treatment is returned to the anaerobism of biological sewage treatment or anaerobic treatment unit inlet end processes;
(3) mix with mud or supernatant liquor by adding molysite in anaerobism or anaerobic treatment unit exit end, and precipitate and separate, further dephosphorization is carried out to sewage.
Describedly add dephosphorization with ferric salt, can at broken wall mud after anaerobism or anoxic unit process, at the exit end of anaerobism or anoxic unit, get its mud mixture after precipitate and separate, molysite mixing is added in supernatant liquor, and by precipitate and separate, after dephosphorization is carried out to sewage.
Describedly add dephosphorization with ferric salt, at the exit end of anaerobism or anoxic unit, part mud mixture can be got and add molysite, fully after mixing, through precipitate and separate, dephosphorization is carried out to sewage.
Describedly add dephosphorization with ferric salt, at the inlet end of anaerobism or anoxic unit, molysite can be added.
Described method of carrying out mud broken wall with ultrasonic wave, ultrasonic wave acoustic energy density can be selected in the numerical value of 0.05W/mL-0.1W/mL.
Be described as follows:
After the mud mixture that sewage biological treatment system is discharged is separated in settling tank, mud is carried out broken wall treatment with the ultrasonic wave of 0.05W/mL-0.1W/mL scope energy density, the foundation of selection 0.05W/mL-0.1W/mL is, through verification experimental verification, this scope can have certain molten born of the same parents' effect on the basis of effectively reducing investment, and cell cracks rate and is about greater than 10%.Because mud is made up of microorganism and extracellular polymeric (EPS) etc., accounting for mud is that the EPS composition of 50-60% mainly comprises polysaccharide, protein and a small amount of soil ulmin, carry out process with the ultrasonic wave of this scope can efficiently and at low cost EPS be dissolved, obtain the mud lysate that carbon content is higher, the anaerobism or the anaerobic treatment unit inlet end that mixture after cell wall breaking are back to biological processing unit process with it, can provide carbon source for this process biological respinse.For avoiding this treating processes phosphor-removing effect to occur fluctuation, therefore, in the mode adding molysite to the mud mixture after process or the supernatant liquor after precipitate and separate carries out further dephosphorization process.The molysite position added both may be selected in anaerobism or anaerobic treatment unit inlet end, also may be selected in anaerobism or anaerobic treatment unit exit end.The kind adding molysite can be selected: iron trichloride, ferrous sulfate, polyiron sulfate, compound iron, polychloride ferro-aluminum, polychloride ferric sulfate, poly aluminium sulfate iron, poly aluminium iron silicate.
The invention has the beneficial effects as follows, the mud broken wall backflow utilizing sewage treatment process to produce coordinates molysite sewage to be carried out to the method for dephosphorization; By ultrasonic wave, broken wall is carried out to excess sludge, its EPS is dissolved, backflow can be the carrying out of anaerobism or anaerobic treatment unit etc. in biological removal of phosphorus in wastewater technique as carbon source, has therefore both added the effect of dephosphorization, and can carry out minimizing recycling again to mud; Drop into a small amount of molysite and not only can ensure phosphor-removing effect, compare other technique, decrease cost of investment.
Accompanying drawing explanation
Fig. 1: mud broken wall is back to anaerobic treatment unit rearmounted mud mixture polyaddition aluminum chloride dephosphorization some processes schematic diagram;
Fig. 2: mud broken wall is back to anaerobic treatment unit rearmounted mud mixture polyaddition aluminum chloride dephosphorization some processes schematic diagram;
Fig. 3: mud broken wall is back to anaerobic treatment unit rearmounted supernatant liquor polyaddition aluminum chloride dephosphorization some processes schematic diagram;
Fig. 4: mud broken wall is back to anaerobic treatment unit rearmounted supernatant liquor polyaddition aluminum chloride dephosphorization some processes schematic diagram;
Fig. 5: mud broken wall is back to anaerobic treatment unit preposition mud mixture polyaddition aluminum chloride dephosphorization some processes schematic diagram;
Fig. 6: mud broken wall is back to anaerobic treatment unit preposition mud mixture polyaddition aluminum chloride dephosphorization some processes schematic diagram;
Fig. 7: mud broken wall is back to the preposition mud mixture of anaerobic treatment unit and adds poly aluminium iron silicate dephosphorization some processes schematic diagram;
Wherein: in the present invention, all arrows that realizes represent that process sequence is connected, and dotted arrow represents that centre has some processes to omit.
Embodiment
The present invention is back to bio anaerobic or anoxic unit for dephosphorization process after being applicable to carry out broken wall to the excess sludge that sewage work produces with ultrasonic wave provide carbon source, increase phosphor-removing effect, and by adding a certain amount of molysite to mud mixture or supernatant liquor before or after anaerobism or anoxic unit, ensure phosphor-removing effect, with ultrasonic wave, broken wall is carried out to excess sludge, mud EPS is dissolved, lysate is back to biological processing unit, for this unit provides carbon source, increase its phosphor-removing effect, coordinate and add molysite, ensure that phosphor in sewage content reaches emission standard in the mode of dephosphorization with ferric salt.The method not only realizes the utilization to sludge reduction resource utilization, also for biological processing unit provides requisite carbon source, and coordinates a small amount of dephosphorization with ferric salt, under the prerequisite meeting processing target, significantly reduces cost.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Embodiment 1
The present embodiment is improved to example with the treatment process of the sewage work processing 30,000 tons of sewage day, and as shown in Figure 1, this sewage work adopts A
2o (anaerobic-anoxic-oxic) technique carries out synchronous denitrification dephosphorizing.Producing sludge quantity every day is 300m
3.By 100m
3mud send into sonication cell, the acoustic density of sonication cell is 0.05W/mL, and ultrasonic time is 10min, sludge reflux after treatment to anaerobic treatment unit, for this process denitrogenation dephosphorizing provides carbon source.The mud mixture that anaerobic treatment unit is discharged fully is mixed with the polymeric aluminum chlorides solution of 3mg/L, and set up a precipitate and separate pond, place at anaerobic treatment unit exit end, mud mixture is after this place carries out mud-water separation, and supernatant liquor enters the original subsequent technique of this sewage work and continues process.Through the monitoring to orthophosphoric acid salt in secondary sedimentation basins water outlet, in this plant effluent, orthophosphoric acid salt content is lower than 0.5mg/L (one-level A standard).
Embodiment 2
The present embodiment is substantially the same manner as Example 1, as shown in Figure 2, equally in this sewage work, with 100m
3mud send into sonication cell, the acoustic density of sonication cell is 0.05W/mL, and ultrasonic time is 10min, and difference is, sludge reflux after treatment to anaerobic treatment unit, for this process denitrogenation dephosphorizing provides carbon source.The mud mixture that anaerobic treatment unit is discharged fully is mixed with the polymeric aluminum chlorides solution of 3mg/L, and set up a precipitate and separate pond, place at anaerobic treatment unit exit end, mud mixture is after this place carries out mud-water separation, and supernatant liquor enters the original subsequent technique of this sewage work and continues process.Through the monitoring to orthophosphoric acid salt in secondary sedimentation basins water outlet, in this plant effluent, orthophosphoric acid salt content is lower than 0.5mg/L (one-level A standard).
Embodiment 3
The present embodiment is substantially the same manner as Example 1, as shown in Figure 3, equally in this sewage work, with 100m
3mud send into sonication cell, the acoustic density of sonication cell is 0.05W/mL, and ultrasonic time is 10min, and difference is, sludge reflux after treatment to anaerobic treatment unit, for this process denitrogenation dephosphorizing provides carbon source.A precipitate and separate pond, place is set up at anaerobic treatment unit exit end, the mud mixture that anaerobic treatment unit is discharged is carried out mud-water separation herein, supernatant liquor fully mixes with the polymeric aluminum chlorides solution of 3mg/L, and enters the original subsequent technique continuation process of this sewage work.Through the monitoring to orthophosphoric acid salt in secondary sedimentation basins water outlet, in this plant effluent, orthophosphoric acid salt content is lower than 0.5mg/L (one-level A standard).
Embodiment 4
The present embodiment is substantially the same manner as Example 3, and as shown in Figure 4, difference is that the sludge reflux after ultrasonication is to anaerobic treatment unit.
Embodiment 5
The present embodiment is substantially the same manner as Example 1, and as shown in Figure 5, difference is that the mud after ultrasonication fully mixed with the polymerize aluminum chloride of 3mg/L before input anaerobic treatment unit, and mixed mud enters anaerobic treatment unit together with sewage.
Embodiment 6
The present embodiment is substantially the same manner as Example 5, and as shown in Figure 6, difference is that the mud after ultrasonication fully mixed with the polymerize aluminum chloride of 3mg/L before input anaerobic treatment unit, and mixed mud enters anaerobic treatment unit together with sewage.
Embodiment 7
The present embodiment is substantially the same manner as Example 6, and as shown in Figure 7, difference is that the molysite added changes the poly aluminium iron silicate of 3mg/L into.
Claims (5)
1. the backflow of mud broken wall adds the method that molysite carries out sewage dephosphorization, and its feature is at least made up of following process:
(1), after the mud mixture that sewage biological treatment system is discharged is separated in settling tank, mud is carried out broken wall treatment with ultrasonic wave;
(2) mud after broken wall treatment is returned to the anaerobism of biological sewage treatment or anaerobic treatment unit inlet end processes;
(3) mix with mud or supernatant liquor by adding molysite in anaerobism or anaerobic treatment unit exit end, and precipitate and separate, further dephosphorization is carried out to sewage.
2. the method for claim 1, it is characterized in that adding dephosphorization with ferric salt, at broken wall mud after anaerobism or anoxic unit process, at the exit end of anaerobism or anoxic unit, get its mud mixture after precipitate and separate, molysite mixing is added in supernatant liquor, and by precipitate and separate, after dephosphorization is carried out to sewage.
3. the method for claim 1, is characterized in that adding dephosphorization with ferric salt, at the exit end of anaerobism or anoxic unit, gets part mud mixture and adds molysite, fully after mixing, through precipitate and separate, carries out dephosphorization to sewage.
4. the method for claim 1, is characterized in that adding dephosphorization with ferric salt, at the inlet end of anaerobism or anoxic unit, adds molysite.
5. the method for claim 1, it is characterized in that the method for carrying out mud broken wall with ultrasonic wave, ultrasonic wave acoustic energy density is at 0.05W/mL-0.1W/mL.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510166149.1A CN104817224A (en) | 2015-04-08 | 2015-04-08 | Sewage phosphate removing method by breaking wall, backflowing and adding ferric salt |
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| CN201510166149.1A CN104817224A (en) | 2015-04-08 | 2015-04-08 | Sewage phosphate removing method by breaking wall, backflowing and adding ferric salt |
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| CN106277329A (en) * | 2016-10-11 | 2017-01-04 | 临邑禹王植物蛋白有限公司 | A kind of method utilizing twin-stage anoxia/aerobic technical finesse protein production waste water |
| CN106630370A (en) * | 2015-11-04 | 2017-05-10 | 东莞源控环保科技有限公司 | Hydrodynamic cavitation phosphorus removal device, and sewage treatment system and method applying device |
| CN106882875A (en) * | 2017-02-16 | 2017-06-23 | 洪胜男 | With the system and method for nitrogen phosphorus in membrane technology removal sewage |
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| CN106630370A (en) * | 2015-11-04 | 2017-05-10 | 东莞源控环保科技有限公司 | Hydrodynamic cavitation phosphorus removal device, and sewage treatment system and method applying device |
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| CN106882875A (en) * | 2017-02-16 | 2017-06-23 | 洪胜男 | With the system and method for nitrogen phosphorus in membrane technology removal sewage |
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