CN103755111B - The regulate and control method of phosphorus element high efficiente callback in a kind of livestock and poultry feces - Google Patents
The regulate and control method of phosphorus element high efficiente callback in a kind of livestock and poultry feces Download PDFInfo
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Abstract
The invention discloses the regulate and control method of a kind of livestock and poultry feces phosphorus element high efficiente callback.This regulate and control method comprises the steps: that livestock and poultry feces being introduced microwave induced oxidation process controls reactive tank, adds oxidizing agent solution and oxygen, the effect of microwave modulator pulsed microwave; Livestock and poultry feces supernatant liquor after process is introduced microwave crystallisation process and controls reactive tank, add magnesia mixture solution, pH value adjusting control agent, mechanical stirring mixed solution, the effect of microwave modulator pulsed microwave; Reacted supernatant liquor is introduced settling tank, adopts water decanter overflow water outlet; Adopt intermittent type spoil disposal to control in brilliant for struvite mud, brilliant mud adopts deep bed filter to reclaim.The inventive method can improve livestock and poultry feces phosphorus element and reclaim usefulness, and the phosphorus element rate of recovery is greater than 99%; The present invention can realize organic form phosphorus efficiency in livestock and poultry feces and be rapidly converted into inorganic phosphorous, and organophosphorus transformation efficiency is greater than 99%, and transformation time is less than 60 minutes; The present invention can regulate and control struvite crystallization metastable zone width and position, realizes the granulation of struvite efficient crystallization.
Description
Technical field
The present invention relates to the regulate and control method that in a kind of livestock and poultry feces, phosphorus element reclaims, belong to Agricultural resources and environment technical field.
Background technology
Phosphorus is the essential element in vital process, but phosphorus element worldwide faces the contradiction of scarcity of resources.Meanwhile, a large amount of phosphorus element runs off from environmental process, not only causes body eutrophication to pollute, also makes phosphorus element non-renewable.In recent years, livestock and poultry feces pollution problem highlights day by day, particularly the excessive emissions of phosphorus in livestock and poultry feces, in the urgent need to carrying out rational disposal and utilization.Therefore, reclaim the phosphorus resource in livestock and poultry feces, the nutrient artificial circulation of phosphorus is combined with environmental pollution improvement, there is important researching value.
The main method that phosphorus reclaims has crystallization process, chemical precipitation method, biology to take the photograph phosphorus method and absorption method etc.There is the problems such as high cost, precipitation is incomplete, chemical sludge amount is large in chemical precipitation method; Biology is taken the photograph phosphorus method and is utilized polyP bacteria excessive consumption phosphorus and be stored in cell paste, produces high phosphorus sludge and reclaims phosphorus, but can face the difficult problems such as carbon source deficiency and flora pure culture; There is the problem that sorbing material price is high, adsorption is low in absorption method.Crystallization process is by adding magnesium salts crystalise agent, with nutrient phosphorus, nitrogen generation crystallization reaction, generates struvite.Can be used as the feature of slow-release fertilizer agricultural use based on struvite, struvite crystallization process reclaims phosphorus element and is considered to a kind of New Technologies for Sustainable Development.
Chinese scholars reclaims in the technical parameter, processing condition, recovery product resource utilization etc. of phosphorus element in livestock and poultry feces in struvite method carries out deep research work.But, it is lower that struvite crystallization process reclaims phosphorus usefulness, restrict the actual popularization of this method, reason mainly contains two aspects: one, in livestock and poultry feces, phosphorus element exists with organophosphorus and inorganic phosphorus two kinds of forms, and organic form phosphorus is difficult to directly and crystallizing agent reacts, and only has inorganic phosphorous can generate struvite crystals; Its two, in livestock and poultry feces, a large amount of organic impurity, can cause in struvite crystallisation process and form a large amount of crystallite, easily with supernatant liquor water outlet run off and cannot efficient recovery.
For solving the difficult problem that organic form phosphorus transforms to inorganic phosphorous, Chinese scholars exploitation microbiobacterial agent impels the conversion of P form, patent CN102010840A and CN102010841A discloses microbial function microbial inoculum, insoluble organophosphorus can be decomposed into Soluble Inorganic Phosphorus, but because the speed of microbiobacterial agent conversion Phosphorus fraction is comparatively slow, conversion is incomplete and strict to requirement for environmental conditions, the actual needs that phosphorus element in livestock and poultry feces is reclaimed in struvite crystallization cannot be met, efficiency and function is reclaimed to raising phosphorus element not obvious.
For solving the difficult problem that a large amount of struvite crystallite runs off, Chinese scholars exploitation seeding technique avoids the formation of crystallite to realize crystallization granulation, patent CN202297252U discloses a kind of integrated nitrogen and phosphorus recovery device with low energy consumption, seed particles is utilized to promote struvite crystals growth, improve phosphorus recovering effect, but due to livestock and poultry feces organic impurity component and concentration variation fluctuation larger, seed particles cannot dynamic regulation struvite crystallizing metastable zone position and width, be difficult to avoid struvite crystallite to be formed, improve phosphorus element recovering effect during practical application not obvious.
In recent years, microwave chemical technology is subject to extensive concern, and the application in microwave induced oxidation process control, the control of microwave crystallisation process etc. comes into one's own gradually.Therefore, develop the regulate and control method of a kind of livestock and poultry feces phosphorus element high efficiente callback, utilize microwave chemical technology, realize organic form phosphorus to the rapidly and efficiently conversion of inorganic phosphorous and the granulation of struvite efficient crystallization, become the key content of Researching and practicing, and prior art foregoing is not disclosed.
Summary of the invention
The object of this invention is to provide the regulate and control method that in a kind of livestock and poultry feces, phosphorus element reclaims, the present invention utilizes microwave chemical principle, realize microwave induced oxidation process to control and the control of microwave crystallisation process, overcome that organic form phosphorus is limited to inorganic phosphorous conversion capability, the difficult point of struvite crystallization granulation process dynamic control difficulty, avoid livestock and poultry feces phosphorus element and reclaim the low problem of usefulness.
The regulate and control method of phosphorus element high efficiente callback in a kind of livestock and poultry feces provided by the present invention, comprises the steps:
(1) livestock and poultry feces and oxidizing agent solution are added to microwave induced oxidation process to control in reactive tank, and pass into oxygen and obtain reaction system; By reaction system described in pulsed microwave effect;
(2) supernatant liquor, magnesia mixture solution and pH value adjusting control agent after step (1) being processed are added to microwave crystallisation process and control to obtain mixed solution in reactive tank; With mixed solution described in pulsed microwave effect;
(3) supernatant liquor after step (2) being processed is introduced in settling tank, obtains supernatant liquor through staticly settling.
In above-mentioned regulate and control method, in step (1), the quality water ratio of described livestock and poultry feces can be 30% ~ 70%, specifically can be 30% ~ 50%, 30%, 40%, 50%, 60% or 70%;
Described oxidizing agent solution can be H
2o
2the aqueous solution, described H
2o
2the volumetric molar concentration of the aqueous solution can be 0.5mol/L ~ 2mol/L, specifically can be 0.5mol/L ~ 1.5mol/L, 0.5mol/L, 1mol/L, 1.5mol/L or 2mol/L, can adopt mass concentration be 30% H
2o
2prepare.
In above-mentioned regulate and control method, in step (1), the intake of described oxygen and the volume ratio of described livestock and poultry feces can be 0.5 ~ 2:1, specifically can be 0.5 ~ 1.5:1,0.5:1,1:1,1.5:1 or 2:1;
The add-on of described oxidizing agent solution and the volume ratio of described livestock and poultry feces can be 1 ~ 5:100, specifically can be 1 ~ 3:100,1:100,2:100,3:100,4:100 or 5:100;
Effect insert Venturi tube can be utilized to add described oxidizing agent solution, this feed way can reach fast, mixing efficiently, completely.
In above-mentioned regulate and control method, in step (1), the condition of described pulsed microwave is as follows: power can be 100W ~ 500W, specifically can be 100W ~ 400W, 100W, 200W, 300W, 400W or 500W, frequency can be 500MHz ~ 1000MHz, specifically can be 500MHz ~ 700MHz, 500MHz, 700MHz or 1000MHz;
Described pulsed microwave acts on 10 minutes ~ 60 minutes under temperature can be the condition of 30 DEG C ~ 50 DEG C, as under the condition of 30 DEG C, act on effect 30 minutes, 50 DEG C under the condition of 60 minutes, 30 DEG C condition under effect 10 minutes, 50 DEG C condition under effect 20 minutes, 40 DEG C condition under effect 10 minutes or 40 DEG C condition under effect 60 minutes, and each recurrence interval comprise operation 1 ~ 2 minute and stop 1 ~ 2 minute.
In above-mentioned regulate and control method, in step (2), described magnesia mixture solution is the aqueous solution containing magnesium ion, the volumetric molar concentration of wherein said magnesium ion can be 1mol/L ~ 5mol/L, specifically can be 1mol/L ~ 3mol/L, 1mol/L, 2mol/L, 3mol/L, 4mol/L or 5mol/L, bittern can be adopted to prepare;
Described pH value adjusting control agent is the aqueous solution containing hydroxide ion, and the volumetric molar concentration of described hydroxide ion can be 1mol/L ~ 3mol/L, specifically can be 1mol/L, 2mol/L or 3mol/L, and caustic soda can be adopted to prepare;
Effect insert Venturi tube can be utilized to add described magnesia mixture solution and described pH value adjusting control agent, this feed way can reach fast, mixing efficiently, completely.
In above-mentioned regulate and control method, in step (2), in described supernatant liquor, the concentration of phosphorus element can be 10 ~ 200mg/L, specifically can be 10 ~ 100mg/L, 10mg/L, 50mg/L, 100mg/L or 200mg/L;
In magnesium ion described in described magnesia mixture solution and described supernatant liquor, the mol ratio of phosphorus element can be 1 ~ 2:1, specifically can be 1 ~ 1.5:1,1:1,1.5:1 or 2:1;
The pH value of described mixed solution can be 8 ~ 10, specifically can be 8,9 or 10.
In above-mentioned regulate and control method, in step (2), the condition of described pulsed microwave is as follows: power can be 10W ~ 100W, specifically can be 10W ~ 50W, 10W, 50W or 100W, frequency can be 500MHz ~ 1000MHz, specifically can be 500MHz ~ 700MHz, 500MHz, 700MHz or 1000MHz;
Described pulsed microwave acts on 10 minutes ~ 30 minutes under temperature can be the condition of 10 DEG C ~ 30 DEG C, as under the condition of 20 DEG C, act on effect 20 minutes, 10 DEG C under the condition of 30 minutes, 30 DEG C condition under effect 30 minutes, 10 DEG C condition under effect 20 minutes, 20 DEG C condition under effect 30 minutes or 30 DEG C condition under effect 10 minutes, and each recurrence interval comprise operation 1 ~ 2 minute and stop 1 ~ 2 minute.
In above-mentioned regulate and control method, in step (3), controlling the time that described supernatant liquor staticly settles in described settling tank can be 10 ~ 30 minutes, specifically can be 10 minutes, 20 minutes or 30 minutes.
In above-mentioned regulate and control method, in step (3), described supernatant liquor can adopt the water decanter overflow water outlet of inside and outside double-deck overflow weir, and the water outlet bladed saw tooth of described inside and outside double-deck overflow weir adopts equilateral triangle structure, and material can be duplex stainless steel;
Described staticly settling obtains the brilliant mud of struvite, and the brilliant mud of described struvite adopts intermittent type spoil disposal to control, and each cycle comprises spoil disposal 5 ~ 15 minutes, unloaded 5 ~ 15 minutes.
In above-mentioned regulate and control method, in step (3), adopt the brilliant mud of struvite described in deep bed filter intermittent filtration;
The filter pressure of described deep bed filter can be 0.1Mpa ~ 0.4Mpa, specifically can be 0.1Mpa ~ 0.3Mpa, 0.1Mpa, 0.2Mpa, 0.3Mpa or 0.4Mpa;
Each intermittent filtration cycle comprises filtration 5 ~ 15 minutes and unloaded 5 ~ 15 minutes, can carry out replacing filter bag and collect struvite product during zero load.
The present invention has following beneficial effect:
(1) regulate and control method of livestock and poultry feces phosphorus element provided by the invention high efficiente callback, can improve livestock and poultry feces phosphorus element and reclaim usefulness, and the phosphorus element rate of recovery is greater than 99%.
(2) regulate and control method of the present invention adopts microwave induced oxidation process to control, and can realize organic form phosphorus efficiency in livestock and poultry feces and be rapidly converted into inorganic phosphorous, organophosphorus transformation efficiency is greater than 99%, and transformation time is less than 60 minutes.
(3) regulate and control method of the present invention adopts microwave crystallisation process to control, and can regulate and control struvite crystallization metastable zone width and position, realize the granulation of struvite efficient crystallization, the mean particle size of struvite product is greater than 2mm.
Embodiment
The experimental technique used in following embodiment if no special instructions, is ordinary method.
Material used in following embodiment, reagent etc., if no special instructions, all can obtain from commercial channels.
In following embodiment 1-6, phosphorus content × 100% in phosphorus element organic efficiency=(in livestock and poultry feces in phosphorus content-water outlet phosphorus content)/livestock and poultry feces.
Organic phosphorous content × 100% in livestock and poultry feces before organophosphorus transformation efficiency=(before microwave induced oxidation process in livestock and poultry feces after organic phosphorous content-microwave induced oxidation process in livestock and poultry feces organic phosphorous content)/microwave induced oxidation process.
Phosphorus element high efficiente callback in embodiment 1, livestock and poultry feces
Adopt 30wt%H
2o
2solution preparation H
2o
2content is the oxidizing agent solution of 0.5mol/L, and employing bittern preparation magnesium ion content is the magnesia mixture solution of 5mol/L, and employing caustic soda preparation hydroxide ion content is the pH value adjusting control agent of 2mol/L, then according to the phosphorus element in following step regulation and control recovery livestock and poultry feces.
(1) (phosphorus content is 200mg/L to regulate and control livestock and poultry feces, wherein organic phosphorous content 80mg/L) quality water ratio be after 30%, introducing microwave induced oxidation process controls in reactive tank, adopt gas blower to be that 0.5:1 blasts oxygen by the volume ratio of oxygen and livestock and poultry feces, adopt insert Venturi tube to be that 5:100 sprays into oxidizing agent solution by the volume ratio of oxidizing agent solution and livestock and poultry feces; Adopt microwave modulator to carry out pulsed microwave effect 60 minutes in power 100W, frequency 500MHz, temperature under being the condition of 30 DEG C, each recurrence interval comprises operation 1 minute and stops 1 minute.Organic phosphorous content 0mg/L in livestock and poultry feces after microwave induced oxidation process controls, organophosphorus transformation efficiency is 100%.
(2) after plain for phosphorus in the livestock and poultry feces supernatant liquor after above-mentioned process concentration being regulated to 100mg/L, introducing microwave crystallisation process controls in reactive tank, insert Venturi tube is adopted to be that 1.5:1 sprays into magnesia mixture solution by the mol ratio of phosphorus element in magnesium ion in magnesia mixture solution and supernatant liquor, insert Venturi tube is adopted to spray into pH value adjusting control agent to control mixed solution pH value for 9, with rotating speed 50 revs/min of mechanical stirring mixed solutions, adopt microwave modulator at power 100W, frequency 1000MHz, temperature is pulsed microwave effect 30 minutes under the condition of 20 DEG C, each recurrence interval comprises operation 2 minutes and stops 2 minutes.
(3) above-mentioned reacted supernatant liquor is introduced settling tank, controlling the residence time is 10 minutes, and adopt the water decanter overflow water outlet of inside and outside double-deck overflow weir, overflow weir water outlet bladed saw tooth adopts equilateral triangle structure, and material is duplex stainless steel.The brilliant mud of precipitation struvite adopts intermittent type spoil disposal to control, each cycle comprises spoil disposal 5 minutes and unloaded 5 minutes, brilliant mud adopts upper intake lower outlet type deep bed filter to reclaim, mounting glass silk filter bag 5, filter pressure is 0.4Mpa, adopts intermittent type to control, and each cycle comprises filtration 5 minutes and unloaded 5 minutes, change filter bag during zero load and collect struvite product, mean particle size is 2mm.
After above-mentioned process, collecting phosphorus content in the upper stream water outlet obtained is 1mg/L, then the phosphorus element organic efficiency of regulate and control method of the present invention is 99.5%.
Phosphorus element high efficiente callback in embodiment 2, livestock and poultry feces
Adopt 30wt%H
2o
2solution preparation H
2o
2content is the oxidizing agent solution of 2mol/L, and employing bittern preparation magnesium ion content is the magnesia mixture solution of 3mol/L, and employing caustic soda preparation hydroxide ion content is the pH value adjusting control agent of 1mol/L, then according to the phosphorus element in following step regulation and control recovery livestock and poultry feces.
(1) (phosphorus content is 300mg/L to regulate and control livestock and poultry feces, wherein organic phosphorous content 100mg/L) quality water ratio be after 70%, introducing microwave induced oxidation process controls in reactive tank, gas blower is adopted to be that 2:1 blasts oxygen by the volume ratio of oxygen and livestock and poultry feces, insert Venturi tube is adopted to be that 4:100 sprays into oxidizing agent solution by the volume ratio of oxidizing agent solution and livestock and poultry feces, microwave modulator is adopted to be 500W at power, frequency is 1000MHz, temperature is pulsed microwave effect 30 minutes under the condition of 30 DEG C, each recurrence interval comprises operation 2 minutes and stops 2 minutes.Organic phosphorous content 0.5mg/L in livestock and poultry feces after microwave induced oxidation process controls, organophosphorus transformation efficiency is 99.5%.
(2) after plain for phosphorus in the livestock and poultry feces supernatant liquor after above-mentioned process concentration being regulated to 200mg/L, introducing microwave crystallisation process controls in reactive tank, insert Venturi tube is adopted to spray into magnesia mixture solution by the mol ratio 2:1 of phosphorus element in magnesium ion in magnesia mixture solution and supernatant liquor, insert Venturi tube is adopted to spray into pH value adjusting control agent to control mixed solution pH value for 8, with rotating speed 10 revs/min of mechanical stirring mixed solutions, microwave modulator is adopted to be 10W at power, frequency is 500MHz, temperature is pulsed microwave effect 20 minutes under the condition of 30 DEG C, each recurrence interval comprises operation 1 minute and stops 1 minute.
(3) above-mentioned reacted supernatant liquor is introduced settling tank, controlling the residence time is 20 minutes, and adopt the water decanter overflow water outlet of inside and outside double-deck overflow weir, overflow weir water outlet bladed saw tooth adopts equilateral triangle structure, and material is duplex stainless steel.The brilliant mud of precipitation struvite adopts intermittent type spoil disposal to control, each cycle comprises spoil disposal 10 minutes and unloaded 10 minutes, brilliant mud adopts upper intake lower outlet type deep bed filter to reclaim, mounting glass silk filter bag 7, filter pressure is 0.3Mpa, adopts intermittent type to control, and each cycle comprises filtration 5 minutes and unloaded 15 minutes, change filter bag during zero load and collect struvite product, mean particle size is 3mm.
After above-mentioned process, collecting phosphorus content in the upper stream water outlet obtained is 3mg/L, then the phosphorus element organic efficiency of regulate and control method of the present invention is 99%.
Phosphorus element high efficiente callback in embodiment 3, livestock and poultry feces
Adopt 30wt%H
2o
2solution preparation H
2o
2content is the oxidizing agent solution of 1.5mol/L, and employing bittern preparation magnesium ion content is the magnesia mixture solution of 1mol/L, and employing caustic soda preparation hydroxyl content is the pH value adjusting control agent of 3mol/L, then according to the phosphorus element in following step regulation and control recovery livestock and poultry feces.
(1) (phosphorus content is 100mg/L to regulate and control livestock and poultry feces, wherein organic phosphorous content 50mg/L) quality water ratio be after 50%, introducing microwave induced oxidation process controls in reactive tank, gas blower is adopted to be that 1:1 blasts oxygen by the volume ratio of oxygen and livestock and poultry feces, insert Venturi tube is adopted to be that 2:100 sprays into oxidizing agent solution by the volume ratio of oxidizing agent solution and livestock and poultry feces, microwave modulator is adopted to be 300W at power, frequency is 500MHz, temperature is pulsed microwave effect 10 minutes under the condition of 50 DEG C, each recurrence interval comprises operation 1 minute and stops 1 minute.Organic phosphorous content 0.5mg/L in livestock and poultry feces after microwave induced oxidation process controls, organophosphorus transformation efficiency is 99%.
(2) after plain for phosphorus in the livestock and poultry feces supernatant liquor after above-mentioned process concentration being regulated to 10mg/L, introducing microwave crystallisation process controls in reactive tank, insert Venturi tube is adopted to be that 1:1 sprays into magnesia mixture solution by the mol ratio of phosphorus element in magnesium ion in magnesia mixture solution and supernatant liquor, insert Venturi tube is adopted to spray into pH value adjusting control agent to control mixed solution pH value for 10, with rotating speed 10 revs/min of mechanical stirring mixed solutions, microwave modulator is adopted to be 50W at power, frequency is 700MHz, temperature is pulsed microwave effect 30 minutes under the condition of 10 DEG C, each recurrence interval comprises operation 1 minute and stops 2 minutes.
(3) reacted supernatant liquor is introduced settling tank, controlling the residence time is 30 minutes, and adopt the water decanter overflow water outlet of inside and outside double-deck overflow weir, overflow weir water outlet bladed saw tooth adopts equilateral triangle structure, and material is duplex stainless steel.The brilliant mud of precipitation struvite adopts intermittent type spoil disposal to control, each cycle comprises spoil disposal 15 minutes and unloaded 15 minutes, brilliant mud adopts upper intake lower outlet type deep bed filter to reclaim, mounting glass silk filter bag 10, filter pressure is 0.2Mpa, adopts intermittent type to control, and each cycle comprises filtration 15 minutes and unloaded 15 minutes, change filter bag during zero load and collect struvite product, mean particle size is 5mm.
After above-mentioned process, collecting phosphorus content in the upper stream water outlet obtained is 1mg/L, then the phosphorus element organic efficiency of regulate and control method of the present invention is 99%.
Phosphorus element high efficiente callback in embodiment 4, livestock and poultry feces
Adopt 30wt%H
2o
2solution preparation H
2o
2content is the oxidizing agent solution of 1mol/L, and employing bittern preparation magnesium ion content is the magnesia mixture solution of 2mol/L, and employing caustic soda preparation hydroxyl content is the pH value adjusting control agent of 3mol/L, then according to the phosphorus element in following step regulation and control recovery livestock and poultry feces.
(1) (phosphorus content is 200mg/L to regulate and control livestock and poultry feces, wherein organic phosphorous content 100mg/L) quality water ratio be after 60%, introducing microwave induced oxidation process controls in reactive tank, gas blower is adopted to be that 1:1 blasts oxygen by the volume ratio of oxygen and livestock and poultry feces, insert Venturi tube is adopted to be that 1:100 sprays into oxidizing agent solution by the volume ratio of oxidizing agent solution and livestock and poultry feces, microwave modulator is adopted to be 300W at power, frequency is 700MHz, temperature is pulsed microwave effect 20 minutes under the condition of 50 DEG C, each recurrence interval comprises operation 2 minutes and stops 1 minute.Organic phosphorous content 0mg/L in livestock and poultry feces after microwave induced oxidation process controls, organophosphorus transformation efficiency is 100%.
(2) after plain for phosphorus in the livestock and poultry feces supernatant liquor after above-mentioned process concentration being regulated to 50mg/L, introducing microwave crystallisation process controls in reactive tank, insert Venturi tube is adopted to be that 1:1 sprays into magnesia mixture solution by the mol ratio of phosphorus element in magnesium ion in magnesia mixture solution and supernatant liquor, insert Venturi tube is adopted to spray into pH value adjusting control agent to control mixed solution pH value for 10, with rotating speed 100 revs/min of mechanical stirring mixed solutions, microwave modulator is adopted to be 50W at power, frequency is 1000MHz, temperature is pulsed microwave effect 20 minutes under the condition of 10 DEG C, each recurrence interval comprises operation 2 minutes and stops 2 minutes.
(3) above-mentioned reacted supernatant liquor is introduced settling tank, controlling the residence time is 30 minutes, and adopt the water decanter overflow water outlet of inside and outside double-deck overflow weir, overflow weir water outlet bladed saw tooth adopts equilateral triangle structure, and material is duplex stainless steel.The brilliant mud of precipitation struvite adopts intermittent type spoil disposal to control, each cycle comprises spoil disposal 15 minutes and unloaded 15 minutes, brilliant mud adopts upper intake lower outlet type deep bed filter to reclaim, mounting glass silk filter bag 10, filter pressure is 0.1Mpa, adopts intermittent type to control, and each cycle comprises filtration 15 minutes and unloaded 15 minutes, change filter bag during zero load and collect struvite product, mean particle size is 10mm.
After above-mentioned process, collecting phosphorus content in the upper stream water outlet obtained is 1mg/L, then the phosphorus element organic efficiency of regulate and control method of the present invention is 99.5%.
Phosphorus element high efficiente callback in embodiment 5, livestock and poultry feces
Adopt 30wt%H
2o
2solution preparation H
2o
2content is the oxidizing agent solution of 0.5mol/L, and employing bittern preparation magnesium ion content is the magnesia mixture solution of 4mol/L, and employing caustic soda preparation hydroxyl content is the pH value adjusting control agent of 2mol/L, then according to the phosphorus element in following step regulation and control recovery livestock and poultry feces.
(1) (phosphorus content is 500mg/L to regulate and control livestock and poultry feces, wherein organic phosphorous content 400mg/L) quality water ratio be after 40%, introducing microwave induced oxidation process controls in reactive tank, gas blower is adopted to be that 1.5:1 blasts oxygen by the volume ratio of oxygen and livestock and poultry feces, insert Venturi tube is adopted to be that 3:100 sprays into oxidizing agent solution by the volume ratio of oxidizing agent solution and livestock and poultry feces, microwave modulator is adopted to be 200W at power, frequency is 1000MHz, temperature is pulsed microwave effect 10 minutes under the condition of 40 DEG C, each recurrence interval comprises operation 1 minute and stops 1 minute.Organic phosphorous content 2mg/L in livestock and poultry feces after microwave induced oxidation process controls, organophosphorus transformation efficiency is 99.5%.
(2) after plain for phosphorus in the livestock and poultry feces supernatant liquor after above-mentioned process concentration being regulated to 100mg/L, introducing microwave crystallisation process controls in reactive tank, insert Venturi tube is adopted to be that 1.5:1 sprays into magnesia mixture solution by the mol ratio of phosphorus element in magnesium ion in magnesia mixture solution and supernatant liquor, insert Venturi tube is adopted to spray into pH value adjusting control agent to control mixed solution pH value for 9, with rotating speed 10 revs/min of mechanical stirring mixed solutions, microwave modulator is adopted to be 100W at power, frequency is 1000MHz, temperature is pulsed microwave effect 30 minutes under the condition of 20 DEG C, each recurrence interval comprises operation 2 minutes, stop 1 minute.
(3) above-mentioned reacted supernatant liquor is introduced settling tank, controlling the residence time is 20 minutes, and adopt the water decanter overflow water outlet of inside and outside double-deck overflow weir, overflow weir water outlet bladed saw tooth adopts equilateral triangle structure, and material is duplex stainless steel.The brilliant mud of precipitation struvite adopts intermittent type spoil disposal to control, each cycle comprises spoil disposal 15 minutes, unloaded 5 minutes, brilliant mud adopts upper intake lower outlet type deep bed filter to reclaim, mounting glass silk filter bag 8, filter pressure is 0.4Mpa, adopts intermittent type to control, and each cycle comprises filtration 10 minutes, unloaded 10 minutes, change filter bag during zero load and collect struvite product, mean particle size is 2mm.
After above-mentioned process, collecting phosphorus content in the upper stream water outlet obtained is 5mg/L, then the phosphorus element organic efficiency of regulate and control method of the present invention is 99%.
Phosphorus element high efficiente callback in embodiment 6, livestock and poultry feces
Adopt 30wt%H
2o
2solution preparation H
2o
2content is the oxidizing agent solution of 2mol/L, and employing bittern preparation magnesium ion content is the magnesia mixture solution of 5mol/L, and employing caustic soda preparation hydroxyl content is the pH value adjusting control agent of 1mol/L, then according to the phosphorus element in following step regulation and control recovery livestock and poultry feces.
(1) (phosphorus content is 400mg/L to regulate and control livestock and poultry feces, wherein organic phosphorous content 200mg/L) quality water ratio be after 50%, introducing microwave induced oxidation process controls in reactive tank, gas blower is adopted to be that 0.5:1 blasts oxygen by the volume ratio of oxygen and livestock and poultry feces, insert Venturi tube is adopted to be that 3:100 sprays into oxidizing agent solution by the volume ratio of oxidizing agent solution and livestock and poultry feces, microwave modulator is adopted to be 400W at power, frequency is 700MHz, temperature is pulsed microwave effect 60 minutes under the condition of 40 DEG C, each recurrence interval comprises operation 2 minutes, stop 2 minutes.Organic phosphorous content 0mg/L in livestock and poultry feces after microwave induced oxidation process controls, organophosphorus transformation efficiency is 100%.
(2) after plain for phosphorus in the livestock and poultry feces supernatant liquor after above-mentioned process concentration being regulated to 200mg/L, introducing microwave crystallisation process controls in reactive tank, insert Venturi tube is adopted to be that 2:1 sprays into magnesia mixture solution by the mol ratio of phosphorus element in magnesium ion in magnesia mixture solution and supernatant liquor, insert Venturi tube is adopted to spray into pH value adjusting control agent to control mixed solution pH value for 8, with rotating speed 50 revs/min of mechanical stirring mixed solutions, microwave modulator is adopted to be 10W at power, frequency is 700MHz, temperature is pulsed microwave effect 10 minutes under the condition of 30 DEG C, each recurrence interval comprises operation 1 minute, stop 1 minute.
(3) above-mentioned reacted supernatant liquor is introduced settling tank, controlling the residence time is 10 minutes, and adopt the water decanter overflow water outlet of inside and outside double-deck overflow weir, overflow weir water outlet bladed saw tooth adopts equilateral triangle structure, and material is duplex stainless steel.The brilliant mud of precipitation struvite adopts intermittent type spoil disposal to control, each cycle comprises spoil disposal 5 minutes, unloaded 5 minutes, brilliant mud adopts upper intake lower outlet type deep bed filter to reclaim, mounting glass silk filter bag 5, filter pressure is 0.1Mpa, adopts intermittent type to control, and each cycle comprises filtration 5 minutes, unloaded 5 minutes, change filter bag during zero load and collect struvite product, mean particle size is 5mm.
After above-mentioned process, collecting phosphorus content in the upper stream water outlet obtained is 2mg/L, then the phosphorus element organic efficiency of regulate and control method of the present invention is 99.5%.
Claims (6)
1. a regulate and control method for phosphorus element high efficiente callback in livestock and poultry feces, comprises the steps:
(1) livestock and poultry feces and oxidizing agent solution are added to microwave induced oxidation process to control in reactive tank, and pass into oxygen and obtain reaction system; By reaction system described in pulsed microwave effect;
The intake of described oxygen and the volume ratio of described livestock and poultry feces are 0.5 ~ 2:1;
The add-on of described oxidizing agent solution and the volume ratio of described livestock and poultry feces are 1 ~ 5:100;
Insert Venturi tube is utilized to add described oxidizing agent solution;
The condition of described pulsed microwave is as follows: power is 100W ~ 500W, and frequency is 500MHz ~ 1000MHz;
Described pulsed microwave acts on 10 minutes ~ 60 minutes under temperature is the condition of 30 DEG C ~ 50 DEG C, and each recurrence interval comprises operation 1 ~ 2 minute and stops 1 ~ 2 minute;
(2) supernatant liquor, magnesia mixture solution and pH value adjusting control agent after step (1) being processed are added to microwave crystallisation process and control to obtain mixed solution in reactive tank; With mixed solution described in pulsed microwave effect;
Insert Venturi tube is utilized to add described magnesia mixture solution and described pH value adjusting control agent;
(3) supernatant liquor after step (2) being processed is introduced in settling tank, obtains supernatant liquor through staticly settling;
Described supernatant liquor adopts the water decanter overflow water outlet of inside and outside double-deck overflow weir;
Described staticly settling obtains the brilliant mud of struvite, and the brilliant mud of described struvite adopts intermittent type spoil disposal to control, and each cycle comprises spoil disposal 5 ~ 15 minutes, unloaded 5 ~ 15 minutes;
Adopt the brilliant mud of struvite described in deep bed filter intermittent filtration;
The filter pressure of described deep bed filter is 0.1Mpa ~ 0.4Mpa;
Each intermittent filtration cycle comprises filtration 5 ~ 15 minutes and unloaded 5 ~ 15 minutes.
2. regulate and control method according to claim 1, is characterized in that: in step (1), and the quality water ratio of described livestock and poultry feces is 30% ~ 70%;
Described oxidizing agent solution is H
2o
2the aqueous solution, described H
2o
2the volumetric molar concentration of the aqueous solution is 0.5mol/L ~ 2mol/L.
3. regulate and control method according to claim 1 and 2, is characterized in that: in step (2), and described magnesia mixture solution is the aqueous solution containing magnesium ion, and the volumetric molar concentration of wherein said magnesium ion is 1mol/L ~ 5mol/L;
Described pH value adjusting control agent is the aqueous solution containing hydroxide ion, and the volumetric molar concentration of described hydroxide ion is 1mol/L ~ 3mol/L.
4. regulate and control method according to claim 3, is characterized in that: in step (2), and in described supernatant liquor, the concentration of phosphorus element is 10 ~ 200mg/L;
In magnesium ion described in described magnesia mixture solution and described supernatant liquor, the mol ratio of phosphorus element is 1 ~ 2:1;
The pH value of described mixed solution is 8 ~ 10.
5. regulate and control method according to claim 4, is characterized in that: in step (2), the condition of described pulsed microwave is as follows: power is 10W ~ 100W, and frequency is 500MHz ~ 1000MHz;
Described pulsed microwave acts on 10 minutes ~ 30 minutes under temperature is the condition of 10 DEG C ~ 30 DEG C, and each recurrence interval comprises operation 1 ~ 2 minute and stops 1 ~ 2 minute.
6. regulate and control method according to claim 5, is characterized in that: in step (3), and controlling the time that described supernatant liquor staticly settles in described settling tank is 10 ~ 30 minutes.
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