CN103693828B - Method for processing residual sludge with integrated process of alkaline hydrolysis preprocessing, nitrogen and phosphorus recovery based on magnesium ammonium phosphate method and methane production based on anaerobic digestion - Google Patents
Method for processing residual sludge with integrated process of alkaline hydrolysis preprocessing, nitrogen and phosphorus recovery based on magnesium ammonium phosphate method and methane production based on anaerobic digestion Download PDFInfo
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Abstract
The invention discloses a method for processing residual sludge with an integrated process of alkaline hydrolysis preprocessing, nitrogen and phosphorus recovery based on a magnesium ammonium phosphate method and methane production based on anaerobic digestion. The method comprises the steps of: preprocessing residual sludge with a secondary alkaline hydrolysis method to obtain supernate, adding a magnesium salt solution to separate precipitates, subjecting the supernate to anaerobic processing, and drying the precipitates naturally to obtain crude magnesium ammonium phosphate; injecting the supernate into an anaerobic reactor, and inoculating with 10-60% anaerobic granular sludge, wherein the volumetric loading is controlled to be 0.30-0.75kg COD (Chemical Oxygen Demand)/(m<3>.d), and the productivity of methane reaches 200-400mL CH4/gCOD within 72h. The method disclosed by the invention has the advantages that nutrition elements in the residual sludge are utilized comprehensively, the process is simple and is consistent in flow with low chemical consumption and electricity consumption, methane is recovered while crude magnesium ammonium phosphate is obtained, moreover, residual alkaline solids are beneficial to subsequent processing, and the reduction, stabilization and recycling of the residual sludge are realized comprehensively.
Description
Technical field
The present invention relates to a kind of method of comprehensive sludge treatment and recycling, belong to water treatment field.Be specifically related to the method that a kind of alkaline hydrolysis pre-treatment-ammonium phosphate magnesium processes reclaims phosphorus nitrogen-anaerobic digestion methanogenic integrated technique process excess sludge.
Background technology
Along with the quickening of China's Development of China's Urbanization, urban wastewater discharge constantly increases, and the amount of the mud particularly excess sludge that sewage work produces is increasing.Estimate to 2015, surplus sludge volume will reach 759.4 ten thousand tons, and this numerical value also can continue to increase within for some time.General specific resistance to filtration expense accounts for more than 50% of sewage work's overall running cost, needs huge fund input.Meanwhile, due to the social demand of Sustainable development and the support on policy of government, the emphasis of current solid waste disposal turns to recycling from Environmental capacity.Increasing people recognizes that mud is also a kind of resource, comprises the phosphor resource and biomass energy wherein contained.If the recycling of mud can be realized, then can alleviate the operation working expense of sewage work to a certain extent, also be conducive to environment protection.
Phosphorus is the source of all things on earth growing nutrient, but is a kind of very limited and non-renewable natural Mineral resources.Containing a large amount of phosphorus in municipal effluent, in sewage treatment process, enter excess sludge and be removed, therefore, the potentiality reclaiming phosphorus from excess sludge are very large.The chemical method that adopts carries out phosphorus recovery more at present, comprises ammonium phosphate magnesium processes and calcium phosphate salt method.Due to ammonium phosphate magnesium processes recyclable part ammonia nitrogen while recovery phosphorus, and magnesium ammonium phosphate is good slow release fertilizer, so application is more extensive.Because the phosphorus in mud had both been present in extracellular polymeric, be present in again in born of the same parents, therefore must first make Phosphurus release in supernatant liquor by preprocessing means, redeposition be separated and recycles.
Along with the day by day exhausted of fossil energy (oil and coal) and use the problem of environmental pollution caused increasingly serious in a large number, the recyclability energy developing high effect cleaning is imperative.Biomass energy is as a kind of renewable energy source, and be the current the fourth-largest energy being only second to oil, coal, Sweet natural gas, be the focus of falling over each other development research always.Containing a large amount of organism in excess sludge, such as carbohydrate, protein, fat etc., contain abundant biomass energy.Produce methane by anaerobic digestion, the biomass energy in mud can be recycled.The anaerobic digestion process of mud can be divided into three phases, i.e. hydrolysis stage, product acid phase and methane phase stage.The hydrolysis rate of mud is comparatively slow, is the rate-limiting step of sludge digestion, and major cause is the carrying out that the flocculation structure of mud and microorganism wall hinder hydrolysis reaction.In order to improve the hydrolysis rate of mud, flocculation structure and the microorganism wall of mud can be destroyed by preprocessing means, making VOCs emission in mud to aqueous phase, being easy to be utilized by anerobe metabolism, accelerate methane phase process.
The sludge pre-treatment method of current report has high pressure homogenization method, supersonic method, pearl mill method, microwave method, heating method, freeze-thaw method, salt method, Ozonation, chlorine and chlorine oxidation process, wet oxidation process, acid system and biology to crack method and enzyme process etc.Method is numerous, respectively has feature.But the equipment requirements of complexity, the existence of operation and potential safety hazard, and the problem such as high energy consumption, medicine consumption, make a lot of technology be difficult to large-scale engineer applied.For other pretreatment process, alkaline process have nutritive substance solubility rate high, simple to operate, without the need to the advantage such as special facilities, cost be low.But a significant deficiency after alkaline process process is that pH is high, is unfavorable for follow-up process, as ammonium phosphate magnesium processes reclaims phosphorus and anaerobic digestion methane phase recovery biomass energy, comprehensive specific resistance to filtration and recycling cannot be realized.
Summary of the invention
The invention provides the method that alkaline hydrolysis pre-treatment-ammonium phosphate magnesium processes reclaims phosphorus nitrogen-anaerobic digestion methanogenic integrated technique process excess sludge, the high problem being unsuitable for subsequent disposal of pH value after solution alkaline hydrolysis pretreating sludge, simultaneously, integrated ammonium phosphate magnesium processes reclaims phosphorus nitrogen technology and anaerobic digestion methane phase technology, as the subsequent disposal of alkaline hydrolysis pretreating sludge, reclaim the phosphorus nitrogen in mud and biomass energy, realize the recycling of comprehensive sludge treatment.
For reaching above object, solution of the present invention is:
A kind of alkaline hydrolysis pre-treatment that the present invention proposes-ammonium phosphate magnesium processes reclaims the method for phosphorus nitrogen-anaerobic digestion methanogenic integrated technique process excess sludge, and simple and clear method flow is shown in Fig. 1, and its concrete steps are:
(1) excess sludge pre-treatment: by excess sludge through gravity concentration or to be diluted to concentration be 10-40 g/L, be equivalent to water ratio 96%-99%, obtain pre-treatment excess sludge;
(2) alkaline hydrolysis: each nutritive element in excess sludge (mainly organism, ammonia nitrogen and orthophosphoric acid salt) is transferred in water outlet to greatest extent by secondary alkaline hydrolysis;
(3) ammonium phosphate magnesium processes reclaims phosphorus nitrogen: the volumetric molar concentration of orthophosphoric acid salt in the water outlet that determination step (2) obtains, add the magnesium salt solution of Mg/P mol ratio at 0.8-2, stirring reaction 10-120min, the orthophosphoric acid salt that contains in water outlet and ammonia nitrogen and magnesium ion is made to form magnesium ammonium phosphate sediment, gravity or centrifugation throw out, supernatant liquor enters anaerobic treatment, and throw out is magnesium ammonium phosphate crude product through seasoning;
(4) anaerobic digestion methane phase: supernatant liquor step (3) obtained injects anaerobic reactor, the anaerobic grain sludge of reactor inoculation 10%-60% volume, volumetric loading is 0.30-0.75 kg COD/ (m
3d), 72h completes air-generating reaction, and methane phase ability reaches 200-400 mL CH
4/ g COD.
In aforesaid method, step (2) described secondary alkaline hydrolysis concrete steps are: in first step Basic fluxing raction device, inject the pre-treatment excess sludge of X volume, stir in 50-350rpm, Basic fluxing raction 0.5-8h, makes pH control at 8.5-10.0, centrifugal discharge supernatant liquor, i.e. first step alkaline hydrolysis water outlet, discharges system; Residual solid after centrifugal, namely first step alkaline hydrolysis is residual solid, inject second stage Basic fluxing raction device, in the Basic fluxing raction device of the second stage, inject the water of 2/7-5/7X volume, pH 10.0-13.0 is regulated with the sodium hydroxide solution of 1-20M while 50-350rpm stirs, continue Basic fluxing raction 0.5-8h, make the various nutritive elements in excess sludge farthest be discharged into aqueous phase, centrifugally obtain supernatant liquor, i.e. secondary alkaline hydrolysis supernatant liquor, inject the reactor of first step alkaline hydrolysis, residual solid after centrifugal, namely secondary alkaline hydrolysis is residual solid, discharges system; Recirculation, runs continuously, and wherein organism, ammonia nitrogen and orthophosphoric acid salt are rich in the water outlet of first step alkaline hydrolysis, and pH is 8.5-10.0, reclaims phosphorus nitrogen and anaerobic digestion methane phase for follow-up magnesium ammonium phosphate; Wherein, in the water outlet of described first step alkaline hydrolysis, the concentration of SCOD reaches 2000-10000 mg/L, and the concentration of ammonia nitrogen and orthophosphoric acid salt is respectively 30-180 mg/L and 20-150 mg/L.
In aforesaid method, the centrifugal rotating speed described in step (2) is 2000-6000 rpm, or replaces centrifugal with belt press filtration or filter press, realizes solid-liquid separation.
In aforesaid method, secondary alkaline hydrolysis makes mud TSS and VSS decrement 20%-60% and 30%-80%, and the residual solid water ratio of alkalescence drops to less than 90%, and excess sludge subtracts appearance up to 70%.
In aforesaid method, must step (2) be passed through, farthest discharge various nutrition, and regulate pH to 8.5-10.0, could start to carry out step (3) and (4).
In aforesaid method, the order of step (3) and (4) can be exchanged, both first ammonium phosphate magnesium processes phosphorus nitrogen anaerobic digestion methane phase again can be reclaimed, also can first anaerobic digestion methane phase again ammonium phosphate magnesium processes reclaim phosphorus nitrogen, and preferential mode is first ammonium phosphate magnesium processes reclaims phosphorus nitrogen anaerobic digestion methane phase again.
In aforesaid method, the alkali neutralising capacity with mud self during secondary alkaline hydrolysis regulates pH to 7.5-10.0, and need not add acid treatment.
In aforesaid method, described magnesium salt solution comprises magnesium chloride brine, magnesium sulfate solution or the magnesiumcarbonate aqueous solution, or replaces described magnesium salt solution with seawater.
In aforesaid method, the method can reclaim the ammonia nitrogen of 15%-50% and the orthophosphoric acid salt of 50%-95%.
In aforesaid method, in described supernatant liquor, the organism of more than 70% is converted into methane, and gas generation process is stablized.
In aforesaid method, except the mud of high organic concentration, the mud of the low organic matter of China is also suitable for this technique, can either reclaim biogas as the energy, realize again the stabilization treatment of mud, obtains economy and environment double benefit.
In aforesaid method, described excess sludge is the residual active sludge of municipal sewage plant, concentration basin mud, dewatered sludge and anaerobically digested sludge, comprises treated excess sludge; Described process comprise in acid, ultrasonic, hot and ozone more than one.
In aforesaid method, described anaerobic reactor is all kinds of high efficiency anaerobic reactors of inoculation anaerobic grain sludge and triphase separator collection of biological gas, comprises upflow anaerobic sludge blanket reactor (UASB) or anaerobic expanded granular sludge bed (EGSB).
Know-why of the present invention is: under alkaline condition (pH > 11), and mud flocculation structure and microorganism cells are destroyed, and discharge the materials such as protein, polysaccharide, ammonia nitrogen and orthophosphoric acid salt; Under alkaline condition (pH 8.5-10.5), when the ionic concn of the magnesium ion in solution, ammonia nitrogen and orthophosphoric acid salt amasss the solubility product constant being greater than magnesium ammonium phosphate, will spontaneous generation magnesium ammonium phosphate sediment thing; Under alkaline condition (pH 7.0-10.0), acidication bacterium has higher activity, fast decoupled substrate, and supply methanogen utilizes, and promotes methane phase process.All require alkaline environment based on said process, and required basicity reduces successively, therefore can combine in order, give full play to the effectiveness of alkali, form a whole set of integrated technique, be applicable to specific resistance to filtration.
Compared with prior art, positively effect of the present invention is:
(1) the present invention forms a whole set of integrated technique, can give full play to the pretreated effect of alkaline hydrolysis, without the need to sour neutralization operation in whole process, save reagent consumption.
(2) the present invention can reclaim the total phosphorus of 10%-45% and the orthophosphoric acid salt of 30%-85% in excess sludge, and part ammonia nitrogen is also recycled utilization simultaneously.
(3) the present invention can make the VOCs emission of about 30%-80% in excess sludge to aqueous phase, and wherein the organism of more than 70% can be converted into methane, and gas generation process is stablized.The more important thing is, it is not by the impact of organic percentage composition in mud, for the recycling of China's low organic sludge provides method.
(4) the present invention adopts alkaline hydrolysis process, has certain reduced training to excess sludge, and TSS, VSS reduce 20%-60% and 30%-80%, achieve stabilization and the minimizing of mud, centrifugal rear residual solid water ratio less than 90%, makes reducing sludge volume up to 70%, is conducive to follow-up disposal.
(5) the present invention forms a whole set of integrated technique, synchronously can realize the comprehensive reutilization of various nutritive element in excess sludge, obtain magnesium ammonium phosphate crude product and biomass energy, and achieve effective process of excess sludge, there is the double benefit of remarkable economy and environmental protection.
accompanying drawing illustrates:
Fig. 1 is method flow diagram of the present invention.
Fig. 2 is secondary alkaline hydrolysis process flow sheet.
Embodiment
As shown in Figure 1, the straightforward method flow process of present method is: the excess sludge taking from mud storage pool, and in oxygenation pretreatment reactor, its nutritive element (mainly organism, ammonia nitrogen and orthophosphoric acid salt) discharges and transfers in water outlet; In magnesium ammonium phosphate sediment reactor, orthophosphoric acid salt and ammonia nitrogen and magnesium salts react and define throw out, and wherein throw out can be used for fertiliser production, and further anaerobic treatment made by supernatant liquor; In anaerobically fermenting methane-producing reactor, organism is converted into methane, reclaims biomass energy.Below in conjunction with embodiment, the present invention is described in further detail:
embodiment 1
(1) by the excess sludge in urban sewage treatment system, and through gravity concentration or to be diluted to concentration be 20 g/L, water ratio 98% is equivalent to.
(2) as shown in Figure 2, in first step Basic fluxing raction device A, inject the pre-treatment excess sludge 1 of X volume, its concentration is 20 g/L, is equivalent to water ratio 98%, and stir in 150rpm, Basic fluxing raction 1h, makes pH control at 8.5-10.0.Then centrifugal discharge supernatant liquor, i.e. first step alkaline hydrolysis water outlet 6, discharges system; Residual solid after centrifugal, namely first step alkaline hydrolysis residual solid 2, injects second stage Basic fluxing raction device.In the Basic fluxing raction device B of the second stage, inject the water of 3/7X volume, pH13.0 is regulated with the sodium hydroxide solution of 10M while 150rpm stirs, continue Basic fluxing raction 1h, the various nutritive elements in excess sludge are made farthest to be discharged into aqueous phase, then centrifugally obtain supernatant liquor, i.e. secondary alkaline hydrolysis supernatant liquor 5, inject the reactor of first step alkaline hydrolysis; Residual solid after centrifugal, i.e. secondary alkaline hydrolysis residual solid 3, removal system.Recirculation, runs continuously.First step alkaline hydrolysis water outlet 6 is the supernatant liquor containing ammonia nitrogen (62.5-64.5 mg/L) and orthophosphoric acid salt (62-64 mg/L), and pH is 9.2-9.4.Wherein, residual TSS and VSS of solid 3, than excess sludge, reduces 30%-40% and 40%-50%, shows that the VOCs emission of 40%-50% is to aqueous phase, reaches stabilization effect.Meanwhile, residual solid water ratio can be down to less than 90%, makes reducing sludge volume up to 70%, is conducive to subsequent disposal and disposes.
(3) according to volumetric molar concentration and the content of the orthophosphoric acid salt in step (1) water outlet 6, add the magnesium salts of 1.0 times of mole numbers wherein, 100 rpm stirring reaction 10min are to occurring a large amount of precipitation, then centrifugation throw out, (SCOD is 2370-2400 mg/L to supernatant liquor, ammonia nitrogen is 54.6-56.6 mg/L, and orthophosphoric acid salt is 31-33 mg/L) enter anaerobic treatment, throw out is magnesium ammonium phosphate crude product through seasoning.
(4) supernatant liquor step (2) obtained injects UASB anaerobic reactor, and reactor inoculates the anaerobic grain sludge of 10% volume, and volumetric loading controls at 0.75 kg COD/ (m
3d), 72h completes air-generating reaction, and methane phase ability reaches 290 mL CH
4/ g COD.
embodiment 2
(1) by the excess sludge in urban sewage treatment system, and through gravity concentration or to be diluted to concentration be 20 g/L, water ratio 98% is equivalent to.
(2) as shown in Figure 2, in first step Basic fluxing raction device A, inject the pre-treatment excess sludge 1 of X volume, its concentration is 20 g/L, is equivalent to water ratio 98%, and stir in 150rpm, Basic fluxing raction 1h, makes pH control at 8.5-10.0.Centrifugal discharge supernatant liquor, i.e. first step alkaline hydrolysis water outlet 6, discharge system; Residual solid after centrifugal, namely first step alkaline hydrolysis residual solid 2, injects second stage Basic fluxing raction device.In the Basic fluxing raction device B of the second stage, inject the water of 3/7X volume, while 150rpm stirs, regulate pH13.0 with the sodium hydroxide solution of 10M, continue Basic fluxing raction 1h.Then centrifugally obtain supernatant liquor, i.e. secondary alkaline hydrolysis supernatant liquor 5, inject the reactor of first step alkaline hydrolysis; Residual solid after centrifugal, i.e. secondary alkaline hydrolysis residual solid 3, removal system.Recirculation, runs continuously.First step alkaline hydrolysis water outlet 6 is the supernatant liquor containing ammonia nitrogen (62.5-64.5 mg/L) and orthophosphoric acid salt (62-64 mg/L), and pH is 9.2-9.4.Wherein, residual TSS and VSS of solid 3, than excess sludge, reduces 30%-40% and 40%-50%, shows that the VOCs emission of 40%-50% is to aqueous phase, reaches stabilization effect.Meanwhile, residual solid water ratio can be down to less than 90%, makes reducing sludge volume up to 70%, is conducive to subsequent disposal and disposes.
(3) according to volumetric molar concentration and the content of the orthophosphoric acid salt in step (1) water outlet 6, add the magnesium salts of 1.4 times of mole numbers wherein, 100 rpm stirring reaction 10min are to occurring a large amount of precipitation, then centrifugation throw out, (SCOD is 2330-2360 mg/L to supernatant liquor, ammonia nitrogen is 47.5-49.5 mg/L, and orthophosphoric acid salt is 28-30 mg/L) enter anaerobic treatment, throw out is magnesium ammonium phosphate crude product through seasoning.
(4) supernatant liquor step (2) obtained injects UASB anaerobic reactor, and inoculate the anaerobic grain sludge of 60% volume, volumetric loading controls at 0.33 kg COD/ (m
3d), at 72h, gas generation process terminates substantially, and methane phase ability reaches 390 mL CH
4/ g COD.
The above-mentioned description to embodiment can understand and apply the invention for ease of those skilled in the art.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 embodiment here, those skilled in the art are according to announcement of the present invention, and the improvement made for the present invention and amendment all should within protection scope of the present invention.
Claims (9)
1. alkaline hydrolysis pre-treatment-ammonium phosphate magnesium processes reclaims a method for phosphorus nitrogen-anaerobic digestion methanogenic integrated technique process excess sludge, and it is characterized in that, its method is as follows:
(1) excess sludge pre-treatment: by excess sludge through gravity concentration or to be diluted to concentration be 10-40 g/L, be equivalent to water ratio 96%-99%, obtain pre-treatment excess sludge;
(2) alkaline hydrolysis: each nutritive element in excess sludge is transferred in water outlet to greatest extent by secondary alkaline hydrolysis; Described secondary alkaline hydrolysis concrete steps are: in first step Basic fluxing raction device, inject the pre-treatment excess sludge of X volume, stir in 50-350rpm, Basic fluxing raction 0.5-8h, makes pH control at 8.5-10.0, centrifugal discharge supernatant liquor, i.e. first step alkaline hydrolysis water outlet, discharges system; Residual solid after centrifugal, namely first step alkaline hydrolysis is residual solid, injects second stage Basic fluxing raction device, in the Basic fluxing raction device of the second stage, inject the water of 2/7-5/7X volume, while 50-350rpm stirs, regulate pH 10.0-13.0 with the sodium hydroxide solution of 1-20M, continue Basic fluxing raction 0.5-8h, centrifugally obtain supernatant liquor, i.e. secondary alkaline hydrolysis supernatant liquor, injects the reactor of first step alkaline hydrolysis, residual solid after centrifugal, namely secondary alkaline hydrolysis is residual solid, discharges system; Recirculation, runs continuously, and wherein organism, ammonia nitrogen and orthophosphoric acid salt are rich in the water outlet of first step alkaline hydrolysis, and pH is 8.5-10.0, reclaims phosphorus nitrogen and anaerobic digestion methane phase for follow-up magnesium ammonium phosphate; In the water outlet of described first step alkaline hydrolysis, the concentration of SCOD reaches 2000-10000 mg/L, and the concentration of ammonia nitrogen and orthophosphoric acid salt is respectively 30-180 mg/L and 20-150 mg/L
(3) ammonium phosphate magnesium processes reclaims phosphorus nitrogen: the volumetric molar concentration of orthophosphoric acid salt in the water outlet that determination step (2) obtains, add the magnesium salt solution of Mg/P mol ratio at 0.8-2, stirring reaction 10-120min, the orthophosphoric acid salt that contains in water outlet and ammonia nitrogen and magnesium ion is made to form magnesium ammonium phosphate sediment, gravity or centrifugation throw out, supernatant liquor enters anaerobic treatment, and throw out is magnesium ammonium phosphate crude product through seasoning;
(4) anaerobic digestion methane phase: supernatant liquor step (3) obtained injects anaerobic reactor, the anaerobic grain sludge of reactor inoculation 10%-60% volume, volumetric loading is 0.30-0.75 kg COD/ (m
3d), 72h completes air-generating reaction, and methane phase ability reaches 200-400 mL CH
4/ g COD.
2. a kind of alkaline hydrolysis pre-treatment according to claim 1-ammonium phosphate magnesium processes reclaims the method for phosphorus nitrogen-anaerobic digestion methanogenic integrated technique process excess sludge, and it is characterized in that, the centrifugal rotating speed described in step (2) is 2000-6000 rpm; Or replace centrifugal with belt press filtration or filter press.
3. a kind of alkaline hydrolysis pre-treatment according to claim 1-ammonium phosphate magnesium processes reclaims the method for phosphorus nitrogen-anaerobic digestion methanogenic integrated technique process excess sludge, it is characterized in that, secondary alkaline hydrolysis makes mud TSS and VSS decrement 20%-60% and 30%-80%, and the residual solid water ratio of alkalescence drops to less than 90%, excess sludge subtracts appearance up to 70%.
4. a kind of alkaline hydrolysis pre-treatment according to claim 1-ammonium phosphate magnesium processes reclaims the method for phosphorus nitrogen-anaerobic digestion methanogenic integrated technique process excess sludge, it is characterized in that, the order of step (3) and (4) is exchanged, both first anaerobic digestion methane phase ammonium phosphate magnesium processes recovery phosphorus nitrogen again.
5. a kind of alkaline hydrolysis pre-treatment according to claim 1-ammonium phosphate magnesium processes reclaims the method for phosphorus nitrogen-anaerobic digestion methanogenic integrated technique process excess sludge, it is characterized in that, alkali neutralising capacity with mud self during described secondary alkaline hydrolysis regulates pH to 7.5-10.0, and need not add acid treatment.
6. a kind of alkaline hydrolysis pre-treatment according to claim 1-ammonium phosphate magnesium processes reclaims the method for phosphorus nitrogen-anaerobic digestion methanogenic integrated technique process excess sludge, it is characterized in that, described magnesium salt solution comprises magnesium chloride brine, magnesium sulfate solution or the magnesiumcarbonate aqueous solution, or replaces described magnesium salt solution with seawater.
7. a kind of alkaline hydrolysis pre-treatment according to claim 1-ammonium phosphate magnesium processes reclaims the method for phosphorus nitrogen-anaerobic digestion methanogenic integrated technique process excess sludge, it is characterized in that, in described supernatant liquor, the organism of more than 70% is converted into methane, and gas generation process is stablized; Described method can reclaim the ammonia nitrogen of 15%-50% and the orthophosphoric acid salt of 50%-95%.
8. a kind of alkaline hydrolysis pre-treatment according to claim 1-ammonium phosphate magnesium processes reclaims the method for phosphorus nitrogen-anaerobic digestion methanogenic integrated technique process excess sludge, it is characterized in that, described excess sludge is the residual active sludge of municipal sewage plant, concentration basin mud, dewatered sludge and anaerobically digested sludge, comprises treated excess sludge; Described process comprise in acid, ultrasonic, hot and ozone more than one.
9. a kind of alkaline hydrolysis pre-treatment as claimed in claim 1-ammonium phosphate magnesium processes reclaims the method for phosphorus nitrogen-anaerobic digestion methanogenic integrated technique process excess sludge, it is characterized in that, described anaerobic reactor is all kinds of high efficiency anaerobic reactors of inoculation anaerobic grain sludge and triphase separator collection of biological gas, comprises upflow anaerobic sludge blanket reactor (UASB) or anaerobic expanded granular sludge bed (EGSB).
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| CN111233292B (en) * | 2020-02-25 | 2021-05-04 | 中山大学 | Method for realizing safe disposal and resource recovery of sludge through liquefaction and layering of sludge |
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| CN102060412A (en) * | 2010-11-10 | 2011-05-18 | 天津城市建设学院 | Device and method for improving biological dephosphorizing and denitriding efficiency of low carbon source sewage |
| CN203112675U (en) * | 2013-03-30 | 2013-08-07 | 中山大学 | System for reclaiming phosphorus from residual sludge |
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| JP特许第4335065B2 2009.09.30 * |
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