CN105417782A - Method for using steel slag micro-powder as crystal nucleuses to strengthen wastewater phosphorous removal - Google Patents
Method for using steel slag micro-powder as crystal nucleuses to strengthen wastewater phosphorous removal Download PDFInfo
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- CN105417782A CN105417782A CN201510904191.9A CN201510904191A CN105417782A CN 105417782 A CN105417782 A CN 105417782A CN 201510904191 A CN201510904191 A CN 201510904191A CN 105417782 A CN105417782 A CN 105417782A
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- micro powder
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention relates to a method for using steel slag micro-powder as crystal nucleuses to strengthen wastewater phosphorous removal. The method comprises the following steps that first, coagulating sedimentation is performed, then the steel slag micro-powder and a coagulant aid are added, the steel slag micro-powder is used as crystal nucleuses in phosphate precipitation and is gradually maturated into dense flocs large in particle size under the effect of the coagulant aid, and high-speed solid-liquid separation is performed in a high-density sedimentation tank, and finally hydraulic cyclone separation is performed to obtain the pure steel slag micro-powder for cyclic use. Compared with the prior art, the method is based on the good chemical adsorption and phosphorus removal characteristics of steel slag, is in combination with the high-load sedimentation performance of the high-density sedimentation tank and adopts the steel slag micro-powder as the crystal nucleuses to achieve efficient and economical removal of the phosphorus in wastewater while the chemical agent using amount is greatly reduced, the sedimentation time is shortened, chemical sludge output is reduced and resource utilization of industrial waste steel slag is achieved. The method is clear and reasonable in process principle, stable in operation and low in treatment cost and does not produce the secondary pollution problem.
Description
Technical field
The present invention relates to a kind of sewage water treatment method, especially relate to a kind of method using slag micro powder as nucleus enhanced sewage phosphorous removal.
Background technology
Phosphorus is the most important reason causing body eutrophication.At present, big-and-middle-sized sewage work both domestic and external, generally adopts ripe A
2/ O biological denitrification phosphorous removal technique.Wherein, denitrogenation and dephosphorization process unit are a kind of competitive relations relative to the carbon source in sewage, and carbon source is generally not enough in China's town sewage, cause biological removal of phosphorus in wastewater efficiency lower, be difficult to reach " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) TP concentration primary A standard limited value 0.5mg/L and require (Luo Zhe etc., sludge anaerobic acidogenic fermentation liquid makes carbon source strengthening sewage denitrification and dephosphorization pilot scale research. environmental science, 2015,36 (3): 1000-1005).In the northern area of China temperature lower period, the performance of this problem is particularly outstanding.For tackling this problem, the carbon source in sewage is only only used for denitrogenation by many town sewage plants, and adopts chemical precipitation method to carry out dephosphorization in rear end.
Chemical precipitation dephosphorization process dephosphorization efficiency by using is high, stable and reliable operation, but needs in addition to increase chemical dephosphorization technique unit, has that chemical agent usage quantity is large, running cost is high simultaneously, and can produce a large amount of chemically precipitated sludge, is easy to produce the shortcomings such as secondary pollution.Chinese patent CN101830553A discloses a kind of dephosphorizing crystal seed preparation method for sewage disposal and dephosphorizing crystal seed, this patent disclosure uses surface coverage to have the dephosphorizing crystal seed of steel slag particle as sewage disposal of the calcium silicate hydrate with slow-release capability, but this patent does not illustrate the embody rule mode of this invention crystal seed in sewage disposal.
At present, conventional slag dephosphorization mode is slag filter bed.After filter bed penetrates, it is large that slag changes labour intensity, and the saturated slag of the absorption changed is easy to cause secondary pollution.
Summary of the invention
The present invention is based on the present situation that Biological Phosphorus Removal Processes efficiency is low, chemical precipitation dephosphorization process working cost is high, propose a kind of method using slag micro powder as nucleus enhanced sewage phosphorous removal.
A method using slag micro powder as nucleus enhanced sewage phosphorous removal, the method comprises the following steps:
(1) coagulating sedimentation: to containing PO
4 3-sewage in, dosing coagulant, generates white calcium phosphate precipitation;
(2) flocculation slaking: add slag micro powder and coagulant aids in above-mentioned sewage, the metallic ions Ca that slag micro powder slowly-releasing in sewage goes out
2+, Fe
3+, Al
3+deng with phosphate anion, after being uniformly mixed, generate calcium phosphate precipitation simultaneously.Calcium phosphate precipitation take slag micro powder as nucleus, and under coagulant aids effect, slaking is the closely knit flco that particle diameter is larger gradually;
(3) high speed pellets: by above-mentioned take slag micro powder as the flco of nucleus, in potassium permanganate composites, carry out high speed solid-liquid separation, preferred sedimentation time is 5 ~ 10min;
(4) recycle: the precipitating sludge containing slag micro powder bottom above-specified high density settling tank is pumped to hydrocyclone, realize effectively being separated of slag micro powder and phosphorous chemical sludge, obtain purer slag micro powder, recycle in flocculation maturing process.
In coagulating sedimentation step, described coagulating agent is solvability molysite, aluminium salt, calcium salt or magnesium salts etc., and the present invention preferably adopts FeCl
3.
In coagulating sedimentation step, in coagulating sedimentation step, after coagulant dosage, mass concentration is 1 ~ 4 times of total phosphorus mass concentration in sewage.
In flocculation maturation stage, the particle diameter of the slag micro powder added is 80 ~ 150 μm.The dosage of slag micro powder is 3 ~ 6g/L.
Described coagulant aids is polyacrylamide (PAM), preferably adopts anion-polyacrylamide.The dosage of described coagulant aids is 2 ~ 5mg/L.
The present invention utilizes slag micro powder as nucleus, and slag is the waste in Iron And Steel Industry, and main component is CaO, Fe
2o
3and Al
2o
3deng.Research shows, slag, by slow releasing function, constantly discharges Ca in aqueous phase
2+, Fe
3+, Al
3+, then with the PO in sewage
4 3-, form Ca
3(PO
4)
2with calcium phosphate powder Ca
5(OH) (PO
4)
3, and then be adsorbed on slag surface, realize the efficient chemical Adsorption to phosphor in sewage.Meanwhile, along with the reduction of slag particle diameter, it increases gradually to the adsorptive capacity of phosphorus.
High speed precipitation process of the present invention, can shorten the settling tank residence time greatly.Meanwhile, the precipitating sludge containing slag, by hydrocyclone separation technology, obtains pure micro-sand, achieves the recycle of micro-sand.
Compared with prior art, the present invention is based on the chemisorption dephosphorization characteristics that slag is good, in conjunction with the high loading sedimentation function of potassium permanganate composites, adopt slag micro powder as flco nucleus, while greatly reducing chemical agent usage quantity, shortening sedimentation time, reducing chemical sludge generation, recycling trade waste slag, realize the efficient, economic of phosphor in sewage and remove.Present invention process principle distinct reasonable, stable, processing cost is low, and there is not secondary pollution problem, has higher practical value and environment, economic benefit.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
In the examples below that, in simulated sewage used and sanitary sewage, the concentration of total phosphorus (TP), all adopts ammonium molybdate spectrophotometric method (GB11893-1989) to measure.
Embodiment 1
Phosphorous simulated sewage is prepared in employing potassium primary phosphate (chemical pure), distilled water, and TP concentration is 1.50mg/L, and pH value is 5.68.The simulated sewage of getting 300mL is placed in 400mL beaker, adds a certain amount of coagulating agent FeCl
3, under normal temperature condition, mechanical rapid stirring (200r/min) 1min.Then select the micro-sand or the slag micro powder (particle diameter is 100-120 μm) that add 3g/L (refer to and add rear micro-sand or slag content), add the PAM solution 5 ~ 6 that mass concentration is 2 ‰, mechanical rapid stirring (200r/min) 1min.Then, mechanical low rate mixing (80r/min) 13min, total reaction time is 15min.Finally, get supernatant liquor after staticly settling 30min and measure TP concentration.The different FeCl of contrast examination
3under dosage condition, respectively with the sewage dephosphorization effect that micro-sand and slag micro powder are nucleus, result is as shown in table 1.
Table 1
From table 1, sewage dephosphorization effect can be significantly improved using slag micro powder as nucleus.When not adding molysite, only rely on slag micro powder chemisorption, the dephosphorizing rate of acquisition just reaches 59%.Under identical molysite dosage condition, will apparently higher than using micro-sand as nucleus as the phosphor-removing effect of nucleus using slag micro powder.For reaching identical water outlet TP concentration standard, can obviously reduce coagulating agent FeCl using slag micro powder as nucleus
3usage quantity.
Embodiment 2
The present embodiment with sanitary sewage through biological treatment after secondary clarifier effluent for handling object.In this process water outlet, TP concentration is 1.46mg/L, and pH value is 7.35.The secondary clarifier effluent getting 300mL is placed in 400mL beaker, adds a certain amount of coagulating agent FeCl
3, under normal temperature condition, mechanical rapid stirring (200r/min) 1min.Then select the micro-sand or the slag micro powder (particle diameter is 100-120 μm) that add 3g/L, add the PAM solution 5 ~ 6 that mass concentration is 2 ‰, mechanical rapid stirring (200r/min) 1min.Then, mechanical low rate mixing (80r/min) 13min, total reaction time is 15min.Finally, get supernatant liquor after staticly settling 30min and measure TP concentration.The different FeCl of contrast examination
3under dosage condition, respectively with the actual sewage phosphor-removing effect that micro-sand and slag micro powder are nucleus, result is as shown in table 2.
Table 2
From table 2, for actual second pond process water outlet, under identical molysite dosage condition, will apparently higher than using micro-sand as nucleus as the phosphor-removing effect of nucleus using slag micro powder.Meanwhile, contrast table 1 and table 2 result known, in secondary clarifier effluent, the existence of suspended substance can reduce the method phosphor-removing effect.
Embodiment 3
Phosphorous simulated sewage is prepared in employing potassium primary phosphate (chemical pure), distilled water, and TP concentration is 1.50mg/L, and pH value is 5.68.The simulated sewage of getting 300mL is placed in 400mL beaker, adds a certain amount of coagulating agent FeCl
3, under normal temperature condition, mechanical rapid stirring (200r/min) 1min.Then select the micro-sand or the slag micro powder (particle diameter is 100-120 μm) that add 3g/L, add the PAM solution 5 ~ 6 that mass concentration is 2 ‰, mechanical rapid stirring (200r/min) 1min.Then, mechanical low rate mixing (80r/min) 13min, total reaction time is 15min.Finally, staticly settle, respectively when sedimentation time is 5min, 10min, 20min, 30min, get supernatant liquor and measure TP concentration.Under the different sedimentation time condition of contrast examination, respectively with the sewage dephosphorization effect that micro-sand and slag micro powder are nucleus, result is as shown in table 3.
Table 3
From table 3, be more conducive to cohesion and the precipitating action of flco in chemical precipitation dephosphorization process using slag micro powder as nucleus.When using slag micro powder as nucleus, after sedimentation time is greater than 10min, in supernatant liquor, TP concentration remains unchanged substantially.And when using micro-sand as nucleus, only having after the settling time is greater than 20min, in supernatant liquor, TP concentration just keeps stable.
Embodiment 4
The present embodiment with urban wastewater treatment firm secondary clarifier effluent for handling object.In this process water outlet, TP concentration is about 1.50mg/L, and pH value is 7.86.Under normal temperature condition, adopt conventional high density depositing technology (coagulation basin--add pond--aerobic fermentation tank--high speed pellets pond), and run in Continuous Flow mode, processing power is 1m
3/ h.Wherein coagulation basin, add pond and adopt mechanical rapid stirring (135r/min) 2min, aerobic fermentation tank adopts mechanical low rate mixing (75r/min) 13min.Potassium permanganate composites surface load is 40m
3/ (m
2h).The dosage of PAM is 2mg/L, and the dosage of micro-sand or slag micro powder (particle diameter is 100-120 μm) is 3g/L.The precipitating sludge containing micro-sand or slag micro powder bottom high speed pellets pond is pumped to hydrocyclone, realizes effectively being separated of slag micro powder or micro-sand and phosphorous chemical sludge, obtain pure slag micro powder or micro-sand, and circulating is to adding in pond.The different FeCl of contrast examination
3under dosage condition, respectively with the actual sewage phosphor-removing effect that micro-sand and slag micro powder are nucleus, result is as shown in table 4.
Table 4
From table 4, for urban wastewater treatment firm secondary clarifier effluent, under identical molysite dosage condition, will apparently higher than using micro-sand as nucleus as the phosphor-removing effect of nucleus using slag micro powder.Work as Fe
3+when dosage is 6mg/L, in high-density depositing technology water outlet using slag micro powder as nucleus, TP concentration is only 0.37mg/L, reaches " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) TP concentration primary A standard limited value 0.5mg/L.
Above-mentioned is can understand and use invention for ease of those skilled in the art to the description of embodiment.Person skilled in the art obviously easily can make various amendment to these embodiments, and General Principle described herein is applied in other embodiments and need not through performing creative labour.Therefore, the invention is not restricted to above-described embodiment, those skilled in the art, according to announcement of the present invention, do not depart from improvement that scope makes and amendment all should within protection scope of the present invention.
Claims (9)
1. the method using slag micro powder as nucleus enhanced sewage phosphorous removal, is characterized in that, the method comprises the following steps:
(1) coagulating sedimentation: to containing PO
4 3-sewage in, dosing coagulant, generate calcium phosphate precipitation;
(2) flocculation slaking: add slag micro powder and coagulant aids in above-mentioned sewage, calcium phosphate precipitation take slag micro powder as nucleus, and under coagulant aids effect, slaking is the closely knit flco that particle diameter is larger gradually;
(3) high speed pellets: by above-mentioned take slag micro powder as the flco of nucleus, carry out high speed solid-liquid separation;
(4) recycle: be separated by the above-mentioned precipitating sludge containing slag micro powder, obtain pure slag micro powder, recycles in flocculation maturing process.
2. a kind of method using slag micro powder as nucleus enhanced sewage phosphorous removal according to claim 1, is characterized in that, in coagulating sedimentation step, described coagulating agent is solvability molysite, aluminium salt, calcium salt or magnesium salts.
3. a kind of method using slag micro powder as nucleus enhanced sewage phosphorous removal according to claim 1, is characterized in that, in coagulating sedimentation step, after coagulant dosage, mass concentration is 1 ~ 4 times of total phosphorus mass concentration in sewage.
4. a kind of method using slag micro powder as nucleus enhanced sewage phosphorous removal according to claim 1, is characterized in that, in flocculation maturation stage, the particle diameter of the slag micro powder added is 80 ~ 150 μm.
5. a kind of method using slag micro powder as nucleus enhanced sewage phosphorous removal according to claim 1, is characterized in that, in flocculation maturation stage, the dosage of slag micro powder is 3 ~ 6g/L.
6. a kind of method using slag micro powder as nucleus enhanced sewage phosphorous removal according to claim 1, is characterized in that, in flocculation maturation stage, described coagulant aids is polyacrylamide.
7. a kind of method using slag micro powder as nucleus enhanced sewage phosphorous removal according to claim 1, is characterized in that, in flocculation maturation stage, the dosage of described coagulant aids is 2 ~ 5mg/L.
8. a kind of method using slag micro powder as nucleus enhanced sewage phosphorous removal according to claim 1, it is characterized in that, high speed pellets step is carried out in potassium permanganate composites.
9. a kind of method using slag micro powder as nucleus enhanced sewage phosphorous removal according to claim 1, is characterized in that, in recycle step, described is separated into hydrocyclone separation technology.
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|---|---|---|---|
| CN201510904191.9A CN105417782A (en) | 2015-12-09 | 2015-12-09 | Method for using steel slag micro-powder as crystal nucleuses to strengthen wastewater phosphorous removal |
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| CN201510904191.9A CN105417782A (en) | 2015-12-09 | 2015-12-09 | Method for using steel slag micro-powder as crystal nucleuses to strengthen wastewater phosphorous removal |
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Cited By (7)
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| CN105776658A (en) * | 2016-03-24 | 2016-07-20 | 武汉尚远环保技术有限公司 | Sewage rapid separation purifier |
| CN107324473A (en) * | 2017-06-24 | 2017-11-07 | 常州市宝平不绣钢制品有限公司 | A kind of method that composite dephosphorizing agent is prepared based on converter slag |
| CN108773882A (en) * | 2018-06-26 | 2018-11-09 | 清华大学深圳研究生院 | A kind of Inorganic complex coagulant and its preparation method and application |
| CN109231555A (en) * | 2018-07-11 | 2019-01-18 | 华东理工大学 | A kind of tail water processing method |
| CN109304140A (en) * | 2018-12-01 | 2019-02-05 | 浙江永泉化学有限公司 | A kind of preparation method of phosphorus-containing wastewater adsorbent material |
| CN109621892A (en) * | 2019-01-23 | 2019-04-16 | 云南天朗再生资源有限责任公司 | A kind of AMD fast purification inorganic agent and the preparation method and application thereof |
| CN111036386A (en) * | 2019-12-18 | 2020-04-21 | 攀枝花钢城集团有限公司 | Process for reducing phosphorus content in converter steel slag |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105776658A (en) * | 2016-03-24 | 2016-07-20 | 武汉尚远环保技术有限公司 | Sewage rapid separation purifier |
| CN107324473A (en) * | 2017-06-24 | 2017-11-07 | 常州市宝平不绣钢制品有限公司 | A kind of method that composite dephosphorizing agent is prepared based on converter slag |
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| CN108773882B (en) * | 2018-06-26 | 2021-05-07 | 清华大学深圳研究生院 | Inorganic composite coagulant and preparation method and application thereof |
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| CN109304140A (en) * | 2018-12-01 | 2019-02-05 | 浙江永泉化学有限公司 | A kind of preparation method of phosphorus-containing wastewater adsorbent material |
| CN109621892A (en) * | 2019-01-23 | 2019-04-16 | 云南天朗再生资源有限责任公司 | A kind of AMD fast purification inorganic agent and the preparation method and application thereof |
| CN111036386A (en) * | 2019-12-18 | 2020-04-21 | 攀枝花钢城集团有限公司 | Process for reducing phosphorus content in converter steel slag |
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