CN103693828A - 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
A kind of method that the present invention relates to comprehensive sludge treatment and recycling, belongs to water treatment field.Be specifically related to a kind of alkaline hydrolysis pre-treatment-magnesium ammonium phosphate method and reclaim the method that the methanogenic integrated technique of phosphorus nitrogen-anaerobic digestion is processed excess sludge.
Background technology
Along with the quickening of China's Development of China's Urbanization, urban wastewater discharge constantly increases, and the mud that sewage work produces the particularly amount of excess sludge is increasing.Expectation to 2015 year, surplus sludge volume will reach 759.4 ten thousand tons, and this numerical value also can continue to increase within for some time.General sludge treatment disposal costs accounts for the 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 polluting to control.Increasing people recognizes that mud is also a kind of resource, comprises phosphor resource and the biomass energy of wherein containing.If can realize the recycling of mud, can alleviate to a certain extent the operation working expense of sewage work, be also 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.In municipal effluent, contain a large amount of phosphorus, enter excess sludge and be removed in sewage treatment process, therefore, the potentiality that reclaim phosphorus from excess sludge are very large.The chemical methods that adopt carry out phosphorus recovery more at present, comprise magnesium ammonium phosphate method and calcium phosphate salt method.Due to magnesium ammonium phosphate method recyclable part ammonia nitrogen when reclaiming 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 by preprocessing means, phosphorus be discharged in supernatant liquor, redeposition separation and recycling.
Along with day by day exhausted and a large amount of problem of environmental pollutions that cause that use of fossil energy (oil and coal) are increasingly serious, the recyclability energy of exploitation high effect cleaning is imperative.Biomass energy, as a kind of renewable energy source, is the current the fourth-largest energy that is only second to oil, coal, Sweet natural gas, is the focus of falling over each other development research always.In excess sludge, contain a large amount of organism, such as carbohydrate, protein, fat etc., containing abundant biomass energy.By anaerobic digestion, produce methane, can recycle the biomass energy in mud.The anaerobic digestion process of mud can be divided into three phases, i.e. hydrolysis stage, product acid phase and product methane phase.The hydrolysis rate of mud is slower, is the rate-limiting step of sludge digestion, and major cause is the flco structure of mud and the carrying out that microorganism wall has hindered hydrolysis reaction.In order to improve the hydrolysis rate of mud, can by preprocessing means, destroy flco structure and the microorganism wall of mud, make VOCs emission in mud to water, be easy to be utilized by anerobe metabolism, accelerate to produce methane process.
It is enzyme process etc. that the sludge pre-treatment method of reporting at present 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.Method is numerous, respectively has feature.But complicated equipment requirements, 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 engineering and apply.For other pretreatment process, alkaline process have nutritive substance solubility rate high, simple to operate, without the advantage such as special facilities, cost be low.But a significant deficiency after alkaline process is processed is that pH is high, is unfavorable for follow-up processing, as magnesium ammonium phosphate method reclaims phosphorus and anaerobic digestion product methane recovery biomass energy, cannot realizes comprehensive sludge treatment and dispose and recycling.
Summary of the invention
The invention provides alkaline hydrolysis pre-treatment-magnesium ammonium phosphate method and reclaim the method that the methanogenic integrated technique of phosphorus nitrogen-anaerobic digestion is processed excess sludge, the high problem that is unsuitable for subsequent disposal of pH value after solution alkaline hydrolysis pretreating sludge, simultaneously, integrated magnesium ammonium phosphate method reclaims phosphorus nitrogen technology and methane technology is produced in anaerobic digestion, subsequent disposal as alkaline hydrolysis pretreating sludge, reclaim phosphorus nitrogen and biomass energy in mud, realize the recycling of comprehensive sludge treatment.
For reaching above object, solution of the present invention is:
A kind of alkaline hydrolysis pre-treatment-magnesium ammonium phosphate method that the present invention proposes reclaims the method that the methanogenic integrated technique of phosphorus nitrogen-anaerobic digestion is processed excess sludge, and simple and clear method flow is shown in Fig. 1, and its concrete steps are:
(1) excess sludge pre-treatment: excess sludge is passed through to gravity concentration or is diluted to concentration is 10-40 g/L, is equivalent to water ratio 96%-99%, obtains pre-treatment excess sludge;
(2) alkaline hydrolysis: make each nutritive element in excess sludge (being mainly organism, ammonia nitrogen and orthophosphoric acid salt) transfer to greatest extent in water outlet by secondary alkaline hydrolysis;
(3) magnesium ammonium phosphate method reclaims phosphorus nitrogen: the volumetric molar concentration of orthophosphoric acid salt in the water outlet that determination step (2) obtains, add Mg/P mol ratio at the magnesium salt solution of 0.8-2, stirring reaction 10-120min, make the orthophosphoric acid salt and ammonia nitrogen and the magnesium ion formation magnesium ammonium phosphate sediment that in water outlet, contain, gravity or centrifugation throw out, supernatant liquor enters anaerobic treatment, and throw out is magnesium ammonium phosphate crude product through seasoning;
(4) methane is produced in anaerobic digestion: the supernatant liquor that step (3) is obtained injects anaerobic reactor, the anaerobic grain sludge of reactor inoculation 10%-60% volume, and volumetric loading is 0.30-0.75 kg COD/ (m
3d), 72h completes air-generating reaction, produces methane ability and reaches 200-400 mL CH
4/ g COD.
In aforesaid method, the described secondary alkaline hydrolysis of step (2) concrete steps are: in first step alkaline hydrolysis reactor, inject the pre-treatment excess sludge of X volume, in 50-350rpm, stir, alkaline hydrolysis reaction 0.5-8h, makes pH be controlled at 8.5-10.0, centrifugal discharge supernatant liquor, be the water outlet of first step alkaline hydrolysis, discharge system; Residual solid after centrifugal, be that first step alkaline hydrolysis is residual solid, inject second stage alkaline hydrolysis reactor, in the alkaline hydrolysis reactor of the second stage, inject the water of 2/7-5/7X volume, sodium hydroxide solution with 1-20M when 50-350rpm stirs regulates pH 10.0-13.0, continue alkaline hydrolysis reaction 0.5-8h, make the various nutritive elements in excess sludge farthest be discharged into water, the centrifugal supernatant liquor that obtains, i.e. secondary alkaline hydrolysis supernatant liquor, inject the reactor of first step alkaline hydrolysis, residual solid after centrifugal, secondary alkaline hydrolysis is residual solid, discharge system; Recirculation, operation continuously, 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, for follow-up magnesium ammonium phosphate, reclaim phosphorus nitrogen and methane is produced in anaerobic digestion; 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 described centrifugal rotating speed of step (2) is 2000-6000 rpm, or centrifugal with belt press filtration or filter press replacement, 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 below 90%, and excess sludge subtracts and holds up to 70%.
In aforesaid method, must farthest discharge various nutrition, and regulate pH to 8.5-10.0 by step (2), could start to carry out step (3) and (4).
In aforesaid method, the order of step (3) and (4) can be exchanged, both can first magnesium ammonium phosphate method reclaim phosphorus nitrogen anaerobic digestion product methane again, also can first anaerobic digestion produce methane magnesium ammonium phosphate method recovery phosphorus nitrogen again, and preferential mode is that first magnesium ammonium phosphate method reclaims phosphorus nitrogen anaerobic digestion product methane 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, the organism in described supernatant liquor more than 70% is converted into methane, and gas generation process is stable.
In aforesaid method, except the mud of high organic concentration, the mud of the low organic matter of China is applicable this technique also, can either reclaim biogas as the energy, realizes again the stabilization treatment of mud, obtains economy and environment double benefit.
In aforesaid method, the residual active sludge that described excess sludge is municipal sewage plant, concentration basin mud, dewatered sludge and anaerobically digested sludge, comprise treated excess sludge; Described processing comprises more than one in acid, ultrasonic, heat and ozone.
In aforesaid method, described anaerobic reactor, for 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), mud flco structure and microorganism cells are destroyed, discharge the materials such as protein, polysaccharide, ammonia nitrogen and orthophosphoric acid salt; Under alkaline condition (pH 8.5-10.5), the ionic concn of the magnesium ion in solution, ammonia nitrogen and orthophosphoric acid salt is long-pending while being greater than the solubility product constant of magnesium ammonium phosphate, will spontaneous generation magnesium ammonium phosphate sediment thing; Under alkaline condition (pH 7.0-10.0), acidication bacterium has higher activity, and fast decoupled substrate is supplied with methanogen utilization, promotes to produce methane process.Based on said process, all require alkaline environment, and needed 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 sludge treatment and dispose.
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, in whole process, without sour neutralization operation, has saved 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 water, and wherein more than 70% organism can be converted into methane, and gas generation process is stable.The more important thing is, it is not subject to 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 to process, and excess sludge is had to certain decrement effect, and TSS, VSS reduce 20%-60% and 30%-80%, stabilization and the minimizing of mud have been realized, centrifugal rear residual solid water ratio, below 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, can synchronously realize the comprehensive reutilization of various nutritive elements in excess sludge, obtain magnesium ammonium phosphate crude product and biomass energy, and realized effective processing of excess sludge, there is the double benefit of remarkable economy and environmental protection.
accompanying drawing explanation:
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: take from the excess sludge of mud storage pool, its nutritive element in alkali pretreatment reaction device (being 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 react and have formed throw out with magnesium salts, and wherein throw out can be used for fertiliser production, and supernatant liquor is made further anaerobic treatment; 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:
(1) by the excess sludge in urban sewage treatment system, and through gravity concentration or to be diluted to concentration be 20 g/L, be equivalent to water ratio 98%.
(2) as shown in Figure 2, in first step alkaline hydrolysis reactor A, inject the pre-treatment excess sludge 1 of X volume, its concentration is 20 g/L, is equivalent to water ratio 98%, in 150rpm, stirs, and alkaline hydrolysis reaction 1h, makes pH be controlled at 8.5-10.0.Then centrifugal discharge supernatant liquor, i.e. first step alkaline hydrolysis water outlet 6, discharge system; Residual solid after centrifugal, first step alkaline hydrolysis is residual solid 2, injects second stage alkaline hydrolysis reactor.In the alkaline hydrolysis reactor B of the second stage, inject the water of 3/7X volume, sodium hydroxide solution with 10M when 150rpm stirs regulates pH13.0, continue alkaline hydrolysis reaction 1h, make the various nutritive elements in excess sludge farthest be discharged into water, then the centrifugal supernatant liquor that obtains, i.e. secondary alkaline hydrolysis supernatant liquor 5, injects the reactor of first step alkaline hydrolysis; Residual solid after centrifugal, secondary alkaline hydrolysis is residual solid 3, removal system.Recirculation, continuously operation.First step alkaline hydrolysis water outlet 6 is the supernatant liquor that contains 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 solid 3 TSS and VSS, than excess sludge, have reduced 30%-40% and 40%-50%, show that the VOCs emission of 40%-50%, to water, has reached stabilization effect.Meanwhile, residual solid water ratio can be down to below 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 wherein the magnesium salts of 1.0 times of mole numbers, 100 rpm stirring reaction 10min are to occurring a large amount of precipitations, 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) being obtained injects UASB anaerobic reactor, and reactor is inoculated the anaerobic grain sludge of 10% volume, and volumetric loading is controlled at 0.75 kg COD/ (m
3d), 72h completes air-generating reaction, produces methane ability and reaches 290 mL CH
4/ g COD.
(1) by the excess sludge in urban sewage treatment system, and through gravity concentration or to be diluted to concentration be 20 g/L, be equivalent to water ratio 98%.
(2) as shown in Figure 2, in first step alkaline hydrolysis reactor A, inject the pre-treatment excess sludge 1 of X volume, its concentration is 20 g/L, is equivalent to water ratio 98%, in 150rpm, stirs, and alkaline hydrolysis reaction 1h, makes pH be controlled at 8.5-10.0.Centrifugal discharge supernatant liquor, i.e. first step alkaline hydrolysis water outlet 6, discharge system; Residual solid after centrifugal, first step alkaline hydrolysis is residual solid 2, injects second stage alkaline hydrolysis reactor.In the alkaline hydrolysis reactor B of the second stage, inject the water of 3/7X volume, the sodium hydroxide solution with 10M when 150rpm stirs regulates pH13.0, continues alkaline hydrolysis reaction 1h.Then the centrifugal supernatant liquor that obtains, i.e. secondary alkaline hydrolysis supernatant liquor 5, injects the reactor of first step alkaline hydrolysis; Residual solid after centrifugal, secondary alkaline hydrolysis is residual solid 3, removal system.Recirculation, continuously operation.First step alkaline hydrolysis water outlet 6 is the supernatant liquor that contains 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 solid 3 TSS and VSS, than excess sludge, have reduced 30%-40% and 40%-50%, show that the VOCs emission of 40%-50%, to water, has reached stabilization effect.Meanwhile, residual solid water ratio can be down to below 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 wherein the magnesium salts of 1.4 times of mole numbers, 100 rpm stirring reaction 10min are to occurring a large amount of precipitations, 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) being obtained injects UASB anaerobic reactor, the anaerobic grain sludge of inoculation 60% volume, and volumetric loading is controlled at 0.33 kg COD/ (m
3d), at 72h, gas generation process finishes substantially, produces methane ability and reaches 390 mL CH
4/ g COD.
The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.Person skilled in the art obviously can easily make various modifications to these embodiment, and General Principle described herein is applied in other embodiment and needn't passes through performing creative labour.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and the improvement of making for the present invention and modification all should be within protection scope of the present invention.
Claims (10)
1. alkaline hydrolysis pre-treatment-magnesium ammonium phosphate method reclaims the method that the methanogenic integrated technique of phosphorus nitrogen-anaerobic digestion is processed excess sludge, it is characterized in that, its method is as follows:
(1) excess sludge pre-treatment: excess sludge is passed through to gravity concentration or is diluted to concentration is 10-40 g/L, is equivalent to water ratio 96%-99%, obtains pre-treatment excess sludge;
(2) alkaline hydrolysis: make each nutritive element in excess sludge transfer to greatest extent in water outlet by secondary alkaline hydrolysis;
(3) magnesium ammonium phosphate method reclaims phosphorus nitrogen: the volumetric molar concentration of orthophosphoric acid salt in the water outlet that determination step (2) obtains, add Mg/P mol ratio at the magnesium salt solution of 0.8-2, stirring reaction 10-120min, make the orthophosphoric acid salt and ammonia nitrogen and the magnesium ion formation magnesium ammonium phosphate sediment that in water outlet, contain, gravity or centrifugation throw out, supernatant liquor enters anaerobic treatment, and throw out is magnesium ammonium phosphate crude product through seasoning;
(4) methane is produced in anaerobic digestion: the supernatant liquor that step (3) is obtained injects anaerobic reactor, the anaerobic grain sludge of reactor inoculation 10%-60% volume, and volumetric loading is 0.30-0.75 kg COD/ (m
3d), 72h completes air-generating reaction, produces methane ability and reaches 200-400 mL CH
4/ g COD.
2. a kind of alkaline hydrolysis pre-treatment-magnesium ammonium phosphate method according to claim 1 reclaims the method that the methanogenic integrated technique of phosphorus nitrogen-anaerobic digestion is processed excess sludge, it is characterized in that, the described secondary alkaline hydrolysis of step (2) concrete steps are: in first step alkaline hydrolysis reactor, inject the pre-treatment excess sludge of X volume, in 50-350rpm, stir, alkaline hydrolysis reaction 0.5-8h, make pH be controlled at 8.5-10.0, centrifugal discharge supernatant liquor, i.e. first step alkaline hydrolysis water outlet, discharge system; Residual solid after centrifugal, first step alkaline hydrolysis is residual solid, injects second stage alkaline hydrolysis reactor, in the alkaline hydrolysis reactor of the second stage, inject the water of 2/7-5/7X volume, the sodium hydroxide solution with 1-20M when 50-350rpm stirs regulates pH 10.0-13.0, continues alkaline hydrolysis reaction 0.5-8h, the centrifugal supernatant liquor that obtains, be secondary alkaline hydrolysis supernatant liquor, inject the reactor of first step alkaline hydrolysis, residual solid after centrifugal, be that secondary alkaline hydrolysis is residual solid, discharge system; Recirculation, operation continuously, 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, for follow-up magnesium ammonium phosphate, reclaim phosphorus nitrogen and methane is produced in anaerobic digestion; 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. a kind of alkaline hydrolysis pre-treatment-magnesium ammonium phosphate method according to claim 1 reclaims the method that the methanogenic integrated technique of phosphorus nitrogen-anaerobic digestion is processed excess sludge, it is characterized in that, the described centrifugal rotating speed of step (2) is 2000-6000 rpm; Or replace centrifugal with belt press filtration or filter press.
4. a kind of alkaline hydrolysis pre-treatment-magnesium ammonium phosphate method according to claim 1 reclaims the method that the methanogenic integrated technique of phosphorus nitrogen-anaerobic digestion is processed 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 below 90%, and excess sludge subtracts appearance up to 70%.
5. a kind of alkaline hydrolysis pre-treatment-magnesium ammonium phosphate method according to claim 1 reclaims the method that the methanogenic integrated technique of phosphorus nitrogen-anaerobic digestion is processed excess sludge, it is characterized in that, the order of step (3) and (4) is exchanged, and both methane magnesium ammonium phosphate method recovery phosphorus nitrogen was again produced in first anaerobic digestion.
6. a kind of alkaline hydrolysis pre-treatment-magnesium ammonium phosphate method according to claim 1 reclaims the method that the methanogenic integrated technique of phosphorus nitrogen-anaerobic digestion is processed 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.
7. a kind of alkaline hydrolysis pre-treatment-magnesium ammonium phosphate method according to claim 1 reclaims the method that the methanogenic integrated technique of phosphorus nitrogen-anaerobic digestion is processed 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.
8. a kind of alkaline hydrolysis pre-treatment-magnesium ammonium phosphate method according to claim 1 reclaims the method that the methanogenic integrated technique of phosphorus nitrogen-anaerobic digestion is processed excess sludge, it is characterized in that, organism in described supernatant liquor more than 70% is converted into methane, and gas generation process is stable; Described method can reclaim the ammonia nitrogen of 15%-50% and the orthophosphoric acid salt of 50%-95%.
9. a kind of alkaline hydrolysis pre-treatment-magnesium ammonium phosphate method according to claim 1 reclaims the method that the methanogenic integrated technique of phosphorus nitrogen-anaerobic digestion is processed excess sludge, it is characterized in that, described excess sludge is residual active sludge, concentration basin mud, dewatered sludge and the anaerobically digested sludge of municipal sewage plant, comprises treated excess sludge; Described processing comprises more than one in acid, ultrasonic, heat and ozone.
10. a kind of alkaline hydrolysis pre-treatment-magnesium ammonium phosphate method as claimed in claim 1 reclaims the method that the methanogenic integrated technique of phosphorus nitrogen-anaerobic digestion is processed excess sludge, it is characterized in that, described anaerobic reactor, for 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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