CN101695999A - Method for recovering nutritive materials of phosphorus and nitrogen from sewage and sludge - Google Patents
Method for recovering nutritive materials of phosphorus and nitrogen from sewage and sludge Download PDFInfo
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- CN101695999A CN101695999A CN 200910209814 CN200910209814A CN101695999A CN 101695999 A CN101695999 A CN 101695999A CN 200910209814 CN200910209814 CN 200910209814 CN 200910209814 A CN200910209814 A CN 200910209814A CN 101695999 A CN101695999 A CN 101695999A
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Abstract
The invention provides a method for recovering nutritive materials of phosphorus and nitrogen from sewage and sludge, and belongs to the field of treating and disposing solid wastes. The method is characterized by comprising the following process steps of: adding a certain amount of hydrogen peroxide solution (0.8 to 1.2g H2O2/g dry sludge) to dewatered sludge cakes, stirring and evenly mixing, and performing radiation treatment on the sludge for 3 to 5 minutes under 2,450MHz microwave and at a temperature of between 80 and 120 DEG C; standing and precipitating the sludge-sewage mixed solution for 30 minutes or filtering, and pouring out supernatant for later use; adjusting the pH value of the supernatant to 8.0 to 9.0; adding MgCl2 solution in the mass ratio of Mg2+ to PO43 of 1.2-1.8:1, and when the MgC12 solution is added, slowly stirring (100 to 150r/min) the mixed solution for 10 to 20 minutes until a large amount of white precipitates generate; standing and precipitating the mixed solution for 30 minutes, and filtering and recovering the mixed solution to obtain the white precipitate which is guano. The method can also be used for recovering the phosphorus and nitrogen in the phosphorus-rich sludge, and can reduce the amount of the sludge, and can ensure that the guano has the purity of over 95 percent and can be directly applied in soil to serve as a fertilizer. Moreover, the equipment is simple, operation and maintenance are convenient, operating cost is low and no secondary pollution is caused.
Description
Technical field
The invention belongs to solid waste disposal, disposal field, relate to phosphorus, nitrogen nutrition material in a kind of recycling sewage sludge, thus the method for resource utilization, minimizing mud.
Background technology
Body eutrophication due to nitrogen, phosphorus polluted in recent years is very serious, and lake " wawter bloom " and coastal waters " red tide " happens occasionally, and be more and more fiery.The relation that algae needs nitrogen, phosphorus from water body, for landlocked water body, phosphorus is the key constraints of body eutrophication.Phosphorus in the water body 80% derives from sewage discharge.Therefore, the phosphorus content of controlling effectively and cutting down in the waste discharge has become the important channel that prevents and treats body eutrophication.The new municipal sewage plant's pollutant emission standard formulated of China has proposed more strict requirement to nitrogen, phosphorus, and municipal effluent carries out before discharging that dephosphorization denitrogenation has become newly-built, enlarging and the main task of the municipal sewage plant of reconstructing.
Phosphorus is unidirectional round-robin in biosphere substantially, is a kind of nonupdatable, deficient Mineral resources day by day, under existing technology and economic level, and only enough human the uses 100 years of explored in the world phosphorus margin.And the human phosphorus major part that consumes is present in the sewage, so the recovery of phosphor in sewage is considered to a promotion phosphorus round-robin optimal path.The direction that the sewage sludge treatment technology has begun can to reclaim simultaneously to dephosphorization phosphorus develops, become traditional " processing " more and more obtains countries in the world scholar and government into modern " recovery " great attention, Swedish government has stipulated clearly that from 2010,75% of home consumption phosphorus will come from sewage work.Have research to think, the phosphorus of recovery 75% can reduce the dried amount of solid of mud of 3-3.8% from mud.The research estimates that also phosphorus reclaims and can make the sludge incineration ash amount reduce 12-48%.Research shows that also phosphorus reclaims and also solved the restriction (≤1% P content) of mud in the cement manufacturing is used, because phosphoric acid salt can reduce the endurance of cement.The annual phosphorus quantity discharged of China's sewage is equivalent to 42.17% of phosphorate rock mining amount in 2000, and as seen the phosphorus amount that runs off with sewage is huge, if do not recycled as early as possible, is the serious waste to phosphor resource.
The dephosphorization denitrogenation of municipal sewage plant of newly-built at present, enlarging and reconstruction much adopts enhanced biological phosphorus removal (EBPR) technology, and this process quilt is thought one of most economical, continuable sewage dephosphorization technology.EBPR utilizes polyP bacteria to have the characteristic that anaerobism discharges phosphorus and aerobic (or anoxic) excess absorption phosphorus, and phosphorus is reduced at the content of aerobic (or anoxic) section, finally by discharging rich phosphorus excess sludge phosphorus is cut down from sewage.But phosphorus just redirect to solid-state (mud) from liquid (sewage), is stored in the mud with poly phosphorus (poly-P) form.In the general activated sludge process, phosphorus accounts for the 1.5-2.5% of dewatered sludge, and the phosphorus content in the excess sludge that Biological Phosphorus Removal System is discharged is generally about 6%, can reach 8% individually.Institute for European Environmental Policy estimates that " European Union's municipal wastewater is handled agreement 91/271 " can cause annual about 240,000 tons of phosphoric acid salt (in P) to be transferred in the mud implementing in full of Europe.
This shows, the a large amount of rich phosphorus excess sludge that produces in the saprobia dephosphorization process is carried out the recycling of phosphorus, then can alleviate the situation that consumes the phosphor resource scarcity that may occur excessively that present natural phosphorus ore is hidden effectively with future, also can solve excess sludge simultaneously and handle and handling problems, this has very important effect to realizing sustainable sewage disposal.
At first the phosphorus in the mud to be discharged in the supernatant liquor, again by adding Ca
2+, Mg
2+Obtain purity height, safe and harmless precipitated product (as calcium phosphate, struvite etc.), the form with industrial raw material or fertilizer is used then, to realize the efficient recovery to phosphor resource.Therefore, the phosphorus method of releasing of stability and high efficiency is the primary prerequisite that realizes that excess sludge phosphorus reclaims.Discover 50 ℃ of thermal treatment 1h, releasing phosphorus concentration is 81.8mg/L.And it is too high to think that nitrogen discharges, and the existence meeting of organic substance has a negative impact to the recovery of phosphorus.Therefore from helping the angle consideration that phosphorus reclaims, lower temperature and short heat treatment time (Xue Tao etc., Chinese water supply and drainage, 2006,22 (23): 22-25) are selected in suggestion.And simple 170 ℃ of thermal hydrolysis mud of microwave 5min, the percent hydrolysis of nitrogen can be up to 67% (Qiao Wei etc., environmental science, 2008,29 (1): 152-156).The acidication liquid of employing excess sludges such as Tong Juan carries out phosphorus and removes research, finds that the top condition of struvite is pH10.0, Mg: P=1.8: 1, and stirring reaction 10min.Positive tp removal rate is 92.5%, and total tp removal rate is 83.8%, and ammonia nitrogen removal frank is 12.3%.But excess sludge except that the positive phosphorus that contains 90-140mg/L, also contains the VFA of high density in the supernatant liquor behind acidication, the existence meeting of these organic substances is to the recovery of the phosphorus (Tong Juan etc. that have a negative impact, the environmental engineering journal, 2007,1 (4): 1-4).Excess sludge is behind acidication in addition, and supernatant liquor pH is low, reach the alkaline condition that struvite forms, and needs to consume more alkali.And the suspended solids (SS) in the acidication liquid of excess sludge disturbs the formation be suitable for handling with regenerated precipitation forms (fine granularity), and small-particle struvite precipitation is difficult to results, and causes that foreign matter content improves in the struvite.
Given this, make and recycle that this technology of phosphorus obtains practical application in Sewage Plant in the mud, at first to guarantee the mud cracking, make that phosphorus stabilizer efficiently discharges in the mud, the less important again mud lysate that makes is suitable for forming high-quality struvite precipitation (low as organic material and SS, suitable nitrogen concentration etc.), to guarantee that removed phosphorus is recovered as the struvite that can gather in the crops (the struvite particle is big, and purity height, hardness are big etc.) fully, be beneficial to the struvite as fertilizer sources and obtain marketing and use.Also to minimize cost at last (comprising equipment, medicament expense etc.).
Summary of the invention
In view of the present situation problem of recycling phosphorus in the mud at present with the struvite form, the invention provides a kind of with microwave/hydrogen peroxide high-level oxidation technology breaking sludge, make that phosphorus is farthest discharged with positive phosphorus form in the mud, obtain the suitable sedimentary mud lysate of struvite, not only make the clearance height of phosphorus in the mud, and make the rate of recovery height of phosphorus and the struvite quality height that obtains.The present invention realizes above-mentioned purpose by the following technical solutions.
Technical scheme of the present invention is at first to adopt microwave/hydrogen peroxide high-level oxidation technology, be the heat characteristic rapidly and efficiently of microwave on the one hand, be to utilize hydrogen peroxide under microwave radiation, to produce hydroxyl radical free radical (OH) on the other hand, the heat effect of United microwave and the strong oxidation of hydroxyl radical free radical, make mud lysis, discharge phosphorus, nitrogen in the mud, simultaneously the poly phosphorus in the mud is converted into positive phosphorus.Then regulate mud lysate pH to 8.0-9.0, and add a small amount of Mg
2+Solution forms six water magnesium ammonium phosphates, is commonly called as struvite (MgNH
4PO
46H
2O) reclaimed, struvite is a kind of slow release fertilizer, can form the phosphorus circulation of soil-crop-animal-mankind-soil, removes when realizing phosphorus, nitrogen pollutant.Specifically may further comprise the steps:
1, in dehydrated sludge cake, adds a certain amount of superoxol (0.8-1.2g H
2O
2/ g dewatered sludge), stirs, make to mix, again with above-mentioned mud radiotreatment 3-5min under 80-120 ℃ of temperature of microwave (2450MHz).Make that poly phosphorus is discharged in the solution with positive phosphorus form in the mud.Top condition parameter under different sorts mud, the different microwave frequency is difference to some extent, and character such as the water ratio of hydrogen peroxide add-on, microwave radiation temperature, microwave irradiation time and mud, solid content is relevant.
2, above-mentioned muddy water mixed solution is staticly settled 30min or filtration, inclining, it is standby supernatant liquor.
3, with the supernatant liquor pH regulator to 8.0-9.0.
4, in the supernatant liquor of the above-mentioned pH of regulating, add MgCl again
2Solution makes Mg
2+: PO
4 3-The ratio of amount of substance be 1.2-1.8: 1, the limit edged slowly stirs (100-150r/min) 10-20min to a large amount of white depositions occurring.
5, staticly settle 30min, the white depositions of filtered and recycled gained is the high purity struvite.
Marked improvement of the present invention and advantage are:
(1) this method can make the release rate of positive phosphorus in the mud reach more than 85%.
(2) it is thorough that this method can make mud SS cracking, and SS content is lower than 100mg/L in the lysate.
(3) this method can make that phosphorous recovery reaches more than 95% in the mud.
(4) owing to nitrogen content in the mud all is higher than phosphorus content, NH in the mud supernatant liquor usually
4 +Content is higher, needn't add nitrogenous source, and this method can make that nitrogen recovery reaches more than 20% in the mud.
(5) the struvite average diameter of particles of this method recovery is greater than 0.5mm, and struvite purity is more than 95%, can directly be applied to soil.
(6) this method can improve the dewatering of mud, and moisture percentage in sewage sludge descends more than 50%, thereby makes the reducing sludge volume decrement.
(7) this technical equipment is simple, convenient operating maintenance, and running cost is lower, does not produce any secondary pollution.
Embodiment
Embodiment 1, get the rich phosphorus thickened sludge of certain sewage work, under the normal temperature, in mud, add a certain amount of 30% superoxol (0.6-1.4g H respectively
2O
2/ g dewatered sludge), mix, again with above-mentioned mud under microwave frequency 2450MHz, 100 ℃ of microwave radiation processing 5min.Phosphorus, ammonia-nitrogen content calculate phosphorus, nitrogen release rate in the supernatant liquor of analyzing and processing front and back.The results are shown in Table shown in 1.
The influence that table 1 content of hydrogen peroxide discharges mud phosphorus, nitrogen
As seen from Table 1, the consumption of hydrogen peroxide does not have very big influence to the release rate of total phosphorus, but the release rate that aligns phosphorus has considerable influence, and the hydrogen peroxide steel using amount is few, and positive phosphorus release rate is low, but too much hydrogen peroxide, positive phosphorus release rate does not increase significantly.And have only positive phosphorus could form struvite, therefore, the suitable amounts of hydrogen peroxide is 0.8-1.2g H
2O
2/ g dewatered sludge.
Embodiment 2, get the rich phosphorus thickened sludge of certain sewage work, under the normal temperature, in mud, add a certain amount of 30% superoxol (1.0g H
2O
2/ g dewatered sludge), mix, more above-mentioned mud is divided into 5 parts, respectively under microwave frequency 2450MHz, 60-140 ℃ of microwave radiation processing 5min.Phosphorus, ammonia-nitrogen content calculate phosphorus, nitrogen release rate in the supernatant liquor of analyzing and processing front and back.The results are shown in Table shown in 2.
The influence that table 2 microwave temperature discharges mud phosphorus, nitrogen
As seen from Table 2, with the raising of temperature, the release rate of positive phosphorus increases, but after having arrived certain temperature, the release rate increase is not remarkable, considers Financial cost, and the microwave temperature is advisable with 80-120 ℃.
Embodiment 3, get the rich phosphorus thickened sludge of certain sewage work, under the normal temperature, in mud, add a certain amount of 30% superoxol (1.0g H
2O
2/ g dewatered sludge), mix, more above-mentioned mud is divided into 3 parts, under microwave frequency 2450MHz, 100 ℃ of microwave radiations are handled 2min, 3min, 4min, 5min, 7min respectively.After muddy water mixed solution staticly settled 30min, inclining supernatant liquor.Phosphorus, ammonia-nitrogen content calculate phosphorus, nitrogen release rate in the supernatant liquor of analyzing and processing front and back.The results are shown in Table shown in 3.
The influence that table 3 microwave treatment time discharges mud phosphorus, nitrogen
As seen from Table 3, with increasing of microwave treatment time, the release rate of positive phosphorus increases, but after surpassing certain hour, the releasing effect increase is not remarkable, considers Financial cost, and the microwave temperature is advisable with 3-5min.
Embodiment 4, get the rich phosphorus thickened sludge of certain sewage work, under the normal temperature, in mud, add a certain amount of 30% superoxol (1.0g H
2O
2/ g dewatered sludge), mix, again with above-mentioned mud under microwave frequency 2450MHz, 100 ℃ of microwave radiation processing 3min.After muddy water mixed solution staticly settled 30min, inclining supernatant liquor, was divided into 5 parts.Regulate pH to 7.5,8.0,8.5,9.0,9.5 respectively with NaOH.In supernatant liquor, add MgCl then
2Solution makes Mg
2+: PO
4 3-The ratio of amount of substance be 1.5: 1, slowly stir (120r/min) 15min to a large amount of white depositions occurring.Staticly settle 30min, the white depositions of filtered and recycled gained is struvite.Check and analysis phosphorous recovery, nitrogen recovery, struvite mean diameter, struvite purity.Be shown in Table 4.
Table 4pH value reclaims phosphorus to struvite influence
| ??7.5 | ??8.0 | ??8.5 | ??9.0 | ??9.5 | |
| Phosphorous recovery (%) | ??94.2 | ??95.1 | ??95.6 | ??95.0 | ??94.6 |
| Nitrogen recovery (%) | ??23.2 | ??22.8 | ??22.6 | ??22.5 | ??21.6 |
| Struvite mean diameter (mm) | ??0.44 | ??0.46 | ??0.57 | ??0.60 | ??0.55 |
| Struvite purity (%) | ??99.1 | ??98.6 | ??96.3 | ??95.3 | ??89.1 |
As seen from Table 4, increase with pH, the rate of recovery of phosphorus, nitrogen, struvite diameter do not have noticeable change.But the purity of struvite reduces greatly, so pH is advisable with 8.0-9.0.
Embodiment 5, get the rich phosphorus thickened sludge of certain sewage work, under the normal temperature, in mud, add a certain amount of 30% superoxol (1.0g H
2O
2/ g dewatered sludge), mix, again with above-mentioned mud under microwave frequency 2450MHz, 100 ℃ of microwave radiation processing 3min.After muddy water mixed solution staticly settled 30min, inclining supernatant liquor.Regulate pH to 8.5 with NaOH.Supernatant liquor is divided into 5 parts.In supernatant liquor, add MgCl then
2Solution makes Mg
2+: PO
4 3-The ratio of amount of substance be respectively 1.0-2.0: 1, slowly stir (120r/min) 15min to a large amount of white depositions occurring.Staticly settle 30min, the white depositions of filtered and recycled gained is struvite.Check and analysis phosphorous recovery, nitrogen recovery, struvite mean diameter, struvite purity.Be shown in Table 5.
Table 5 magnesium dosage reclaims the influence of phosphorus to struvite
| ??1.0 | ??1.2 | ??1.5 | ??1.8 | ??2.0 | |
| Phosphorous recovery (%) | ??74.2 | ??93.1 | ??95.6 | ??95.9 | ??91.6 |
| Nitrogen recovery (%) | ??13.2 | ??20.6 | ??21.9 | ??22.7 | ??21.6 |
| Struvite mean diameter (mm) | ??0.41 | ??0.56 | ??0.57 | ??0.62 | ??0.53 |
| Struvite purity (%) | ??92.1 | ??94.6 | ??96.2 | ??95.8 | ??95.1 |
As seen from Table 5, with MgCl
2The increase of solution dosage, Mg
2+: PO
4 3-The ratio of amount of substance increase gradually, the purity of struvite does not have noticeable change, but the rate of recovery of phosphorus, nitrogen, struvite diameter increase.But excessive magnesium has no significant effect the rate of recovery of nitrogen, phosphorus, increases cost so Mg on the contrary
2+: PO
4 3-The ratio of amount of substance with 1.2-1.8: 1 is advisable.
Embodiment 6, get the rich phosphorus thickened sludge of certain sewage work, under the normal temperature, in mud, add a certain amount of 30% superoxol (1.0g H
2O
2/ g dewatered sludge), mix, again with above-mentioned mud under microwave frequency 2450MHz, 100 ℃ of microwave radiation processing 5min.After muddy water mixed solution staticly settled 30min, inclining supernatant liquor.Regulate pH to 8.5 with NaOH.In supernatant liquor, add MgCl then
2Solution makes Mg
2+: PO
4 3-The ratio of amount of substance be 1.8: 1, slowly stir (100r/min) 20min to a large amount of white depositions occurring.Staticly settle 30min, the white depositions of filtered and recycled gained is struvite.Analyze after testing, the rate of recovery of phosphorus reaches 95.7%, and nitrogen recovery reaches 23.4%, struvite average diameter of particles 0.61mm, and struvite purity is 97.4%.
Embodiment 7, get the rich phosphorus thickened sludge of certain sewage work, under the normal temperature, in mud, add a certain amount of 30% superoxol (1.0g H
2O
2/ g dewatered sludge), mix, again with above-mentioned mud under microwave frequency 2450MHz, 100 ℃ of microwave radiation processing 5min.After muddy water mixed solution staticly settled 30min, inclining supernatant liquor.Regulate pH to 8.5 with NaOH.In supernatant liquor, add MgCl then
2Solution makes Mg
2+: PO
4 3-The ratio of amount of substance be 1.8: 1, slowly stir (150r/min) 20min to a large amount of white depositions occurring.Staticly settle 30min, the white depositions of filtered and recycled gained is struvite.Carbon in the solution of results behind the struvite, nitrogen, phosphorus content are all very low, can directly be linked into Sewage treatment systems and handle.Analyze after testing, the rate of recovery of phosphorus reaches 95.2%, and nitrogen recovery reaches 22.6%, struvite average diameter of particles 0.57mm, and struvite purity is 97.2%.The mud that after the supernatant liquor that inclines carries out centrifuge dehydration, and moisture content of the cake is about 44%.
Claims (5)
1. method that reclaims phosphorus in the sewage sludge, nitrogen nutrition material is characterized in that may further comprise the steps:
1) in dehydrated sludge cake, adds a certain amount of superoxol (0.8-1.2g H
2O
2/ g dewatered sludge), stirs, make to mix, again with above-mentioned mud radiotreatment 3-5min under 80-120 ℃ of temperature of microwave (2450MHz).
2) above-mentioned muddy water mixed solution is staticly settled 30min or filtration, inclining, it is standby supernatant liquor.
3) supernatant liquor is regulated pH to 8.0-9.0.
4) add MgCl then
2Solution makes Mg
2+: PO
4 3-The ratio of amount of substance be 1.2-1.8: 1, the limit edged slowly stirs (100-150r/min) 10-20min to a large amount of white depositions occurring.
5) staticly settle 30min, the white depositions of filtered and recycled gained is the high purity struvite.
2. a kind of method that reclaims phosphorus in the sewage sludge, nitrogen nutrition material according to claim 1 is characterized in that described mud is rich phosphorus thickened sludge.
3. a kind of method that reclaims phosphorus in the sewage sludge, nitrogen nutrition material according to claim 1 is characterized in that adding superoxol earlier in mud, after stirring, carries out microwave treatment again.
4. a kind of method that reclaims phosphorus in the sewage sludge, nitrogen nutrition material according to claim 1 is characterized in that described white depositions is the struvite of recovery, and its molecular formula is MgNH
4PO
46H
2O.
5. a kind of method that reclaims phosphorus in the sewage sludge, nitrogen nutrition material according to claim 1 is characterized in that the struvite purity that is reclaimed is more than 95%, and directly as fertilizer sources is applied to soil.
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| CN102464308A (en) * | 2010-11-05 | 2012-05-23 | 天津城市建设学院 | Method for preparing and purifying struvite from residual sludge |
| CN102503060A (en) * | 2011-11-23 | 2012-06-20 | 清华大学 | Method for recovering ferric phosphate from sludge |
| CN102815824A (en) * | 2012-08-30 | 2012-12-12 | 北京世纪国瑞环境工程技术有限公司 | Method for extracting phosphorus from urban excrement |
| CN103359899A (en) * | 2013-08-07 | 2013-10-23 | 湖南大学 | Deep dewatering pretreatment of sludge |
| CN103601343A (en) * | 2013-11-26 | 2014-02-26 | 同济大学 | Biomass-emission-free method for enhancing biological wastewater nitrogen and phosphorus removal effect |
| CN103755111A (en) * | 2014-01-08 | 2014-04-30 | 中国农业大学 | Regulation and control method for efficiently recovering phosphorus in livestock and poultry feces |
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| CN107585993A (en) * | 2017-10-23 | 2018-01-16 | 优比西国际环保科技（北京）股份有限公司 | A kind of processing method and processing device of sludge |
| CN108191182A (en) * | 2018-01-18 | 2018-06-22 | 上海理工大学 | A kind of method that municipal sludge extraction phosphorus is handled by the acid-hatching of young eggs |
| CN108689585A (en) * | 2018-05-25 | 2018-10-23 | 北京工业大学 | A method of recycling phosphorus from cryogenic freezing and microwave combined pretreating sludge supernatant |
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| CN111547973A (en) * | 2020-05-20 | 2020-08-18 | 南昌航空大学 | Method for recovering nitrogen and phosphorus in livestock and poultry manure |
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| CN102503060A (en) * | 2011-11-23 | 2012-06-20 | 清华大学 | Method for recovering ferric phosphate from sludge |
| CN102503060B (en) * | 2011-11-23 | 2013-03-06 | 清华大学 | Method for recovering ferric phosphate from sludge |
| CN102815824A (en) * | 2012-08-30 | 2012-12-12 | 北京世纪国瑞环境工程技术有限公司 | Method for extracting phosphorus from urban excrement |
| CN102815824B (en) * | 2012-08-30 | 2013-11-06 | 北京世纪国瑞环境工程技术有限公司 | Method for extracting phosphorus from urban excrement |
| CN103359899A (en) * | 2013-08-07 | 2013-10-23 | 湖南大学 | Deep dewatering pretreatment of sludge |
| CN103601343A (en) * | 2013-11-26 | 2014-02-26 | 同济大学 | Biomass-emission-free method for enhancing biological wastewater nitrogen and phosphorus removal effect |
| CN103755111B (en) * | 2014-01-08 | 2015-07-29 | 中国农业大学 | The regulate and control method of phosphorus element high efficiente callback in a kind of livestock and poultry feces |
| CN103755111A (en) * | 2014-01-08 | 2014-04-30 | 中国农业大学 | Regulation and control method for efficiently recovering phosphorus in livestock and poultry feces |
| CN104529122A (en) * | 2014-12-10 | 2015-04-22 | 天津壹鸣环境工程有限公司 | Reducing and recycling comprehensive utilization method for water body sediments |
| CN104692837A (en) * | 2015-02-13 | 2015-06-10 | 重庆工商大学 | Method of comprehensively utilizing sludge |
| CN105316002B (en) * | 2015-11-27 | 2018-05-08 | 同济大学 | A kind of preparation method for the multi-functional renovation agent administered for heavy-metal contaminated soil |
| CN105316002A (en) * | 2015-11-27 | 2016-02-10 | 同济大学 | Preparation method of multifunctional repair agent used for governing heavy metal contaminated soil |
| CN107417062A (en) * | 2017-09-08 | 2017-12-01 | 复旦大学 | A kind of method that phosphorus is reclaimed from sludge from wastewater treatment plant |
| CN107585993A (en) * | 2017-10-23 | 2018-01-16 | 优比西国际环保科技（北京）股份有限公司 | A kind of processing method and processing device of sludge |
| CN108191182A (en) * | 2018-01-18 | 2018-06-22 | 上海理工大学 | A kind of method that municipal sludge extraction phosphorus is handled by the acid-hatching of young eggs |
| CN108689585A (en) * | 2018-05-25 | 2018-10-23 | 北京工业大学 | A method of recycling phosphorus from cryogenic freezing and microwave combined pretreating sludge supernatant |
| CN109734215A (en) * | 2019-03-07 | 2019-05-10 | 南开大学 | A method of recovery of nitrogen and phosphorus and synchronous absorption micropollutants in Heisui River are realized using temperature-adjusting device |
| CN111547973A (en) * | 2020-05-20 | 2020-08-18 | 南昌航空大学 | Method for recovering nitrogen and phosphorus in livestock and poultry manure |
| CN112225192A (en) * | 2020-10-19 | 2021-01-15 | 南京融众环境工程研究院有限公司 | Method for preparing struvite by reinforcing residual sludge to release nitrogen and phosphorus and inducing biochar |
| CN112794298A (en) * | 2020-12-29 | 2021-05-14 | 北京科技大学 | Method for recovering phosphorus from phosphorus-containing sludge |
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