CN104370431A - Blue algae dehydrating method - Google Patents
Blue algae dehydrating method Download PDFInfo
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- CN104370431A CN104370431A CN201410684214.5A CN201410684214A CN104370431A CN 104370431 A CN104370431 A CN 104370431A CN 201410684214 A CN201410684214 A CN 201410684214A CN 104370431 A CN104370431 A CN 104370431A
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- green algae
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
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- General Chemical & Material Sciences (AREA)
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a blue algae dehydrating method. The method comprises the steps of performing ultrasonic processing, adding a flocculant and filter-pressing to dehydrate, wherein the specific steps are as follows: ultrasonically processing the blue algae for 2-6min; adding the flocculant in the blue algae after the ultrasonic processing, and uniformly stirring; filter-pressing the blue algae after adding the flocculant to dehydrate. Through the adoption of the method disclosed by the invention, the volume of the blue algae is greatly reduced, the heat value is not changed, and the dehydrating degree is high; the processing speed is high, the operation is simple, the large-scale production is facilitated, and the method has wide application prospect.
Description
Technical field
The present invention relates to blue-green algae and pollute technical field, particularly relate to a kind of method of blue algae dewatering, be specifically related to a kind of method of ultrasonic assistant blue algae dewatering.
Background technology
Eutrophication water outburst algae forms wawter bloom, is a global problem.Over nearly twenties years, along with industrial or agricultural develops rapidly, population increase, urbanization is accelerated, and enters rivers,lakes and seas in a large number, make water surrounding be subject to severe contamination without the sanitary sewage effectively processed and industrial and agricultural production waste water, the Eutrophic Extent aggravation of many water bodys.And body eutrophication causes, and many freshwater lake wawter blooms are spread unchecked, bay frequent occurrence, the odor causing substance that the toxic substance (Algae toxins) of a large amount of blue-green algae release, blue-green algae death discharge afterwards and organism make local water quality and Air quality severe exacerbation, seriously jeopardize fishery and drinking water safety, destroy the water quality of landscape water body.At present mainly through salvaging to control blue algae growth, improving water quality, promoting water quality ecological environment.
The algae rich water ratio salvaging blue-green algae gained is generally 95% ~ 99%, and during blue algae bloom, only just there is the blue-green algae of thousands of tons of salvaged or filtration treatment every day in Taihu Lake.Salvage blue-green algae out due to water ratio too high, give transport, storage bring very large cost, also bring great difficulty to ultimate disposal; And blue-green algae is very easily rotten, produces stench after rotting, bring many detrimentally affects to surrounding environment, therefore must fast processing blue-green algae.If directly blue-green algae is carried out landfill, then occupy land resources day by day in short supply; Because blue-green algae water ratio is higher, be also not suitable for incineration disposal.And containing a large amount of cyanophycean toxin in blue-green algae, cyanophycean toxin is intracellular toxin, and cell rupture discharges and shows toxicity, primarily of microcystic aeruginosa, anabena, the generation such as algae and Microcystis viridis of quivering, causes very large impact to environment.
Carrying out processed to the blue-green algae salvaged, thus reduce blue-green algae volume, is the precondition realizing blue-green algae safe disposal and recycling.At present, have some researchs to blue algae dewatering technology both at home and abroad, blue algae dewatering method based on mechanical dehydration, but needs to nurse one's health before mechanical dehydration, to destroy the avidity between the colloidal structure of blue-green algae, algae water, improves dewatering.The Opsonizing method that current blue algae dewatering generally adopts is chemical conditioning, namely in blue-green algae, add the chemical agents such as appropriate coagulating agent, coagulant aids, in and blue-green algae particle institute electrically charged, reduce the avidity of blue-green algae particle and water molecules, impel blue-green algae particle flocculation, thus improve the dewatering of blue-green algae.Traditional amendment comprises iron trichloride, Ming Ji, lime, flyash, clay etc., and these flocculation agents not only can be used alone, also can conbined usage.With regard to current treatment effect, use blue-green algae moisture content of the cake that the blue-green algae after flocculation agent conditioning obtains through mechanical dehydration still up to 75% ~ 90%, simultaneously the cost of flocculation agent that not only adds of these treatment processs is higher, and the mud cake after dehydration can't meet landfill or burn requirement, and the flocculation agent remained in blue-green algae slag can produce permanent ecological risk to surrounding environment.Adopt the framework construction such as lime, flyash body conditioning blue-green algae, the water ratio of blue-green algae slag can drop to 57% ~ 87%, but the dosage of framework construction body is comparatively large, not only substantially increases the volume of the blue-green algae slag that need process, is also unfavorable for the disposal such as follow-up burning, landfill.Also have employing bioleaching method (number of patent application: the deep dehydration 201210437145.9) promoting blue-green algae, this method length consuming time, experience 48 ~ 72h, and degree of dehydration is not high, and the blue-green algae water ratio after dehydration is 70% simultaneously.
Therefore, study the efficient fast dewatering of new blue-green algae, the technology reducing the water ratio of the rear blue-green algae of dehydration is further significant.
Summary of the invention
To be that the algae water ratio after salvaging for blue-green algae is very high be unfavorable for subsequent transportation and ultimate disposal to the technical problem to be solved in the present invention, and the rear water ratio of use flocculation agent dehydration that existing blue algae dewatering method exists is still higher, need the technical problem such as blue-green algae volume increase processed after using the dehydration such as flyash, lime, provide that a kind of energy consumption is low, processing speed is fast, blue-green algae volume after simple to operate, process reduces greatly, calorific value is unchanged and the method for the blue algae dewatering that degree of dehydration is high.
In order to solve the problems of the technologies described above, the invention provides a kind of method of blue algae dewatering, comprising the following steps:
(1) ultrasonic: blue-green algae is carried out ultrasonication;
(2) flocculation agent is added: in the blue-green algae after ultrasonic, add the blue-green algae that flocculation agent obtains being added with flocculation agent;
(3) filter-press dehydration: the blue-green algae being added with flocculation agent is carried out filter-press dehydration, completes blue algae dewatering step.
In above-mentioned method, preferably, the frequency of ultrasonication is 30 ~ 110kHz, and the sound intensity is 0.4 ~ 0.8W/cm
2, acoustic density is 0.3W/ml ~ 1.0W/ml.
In above-mentioned method, preferably, the time of ultrasonication is 2 ~ 6min.
In above-mentioned method, preferably, flocculation agent is inorganic flocculating agent and/or organic floculant, inorganic flocculating agent addition be the 1wt% ~ 5wt% of blue-green algae dry weight; The addition of organic floculant is the 0.05wt% ~ 0.3wt% of blue-green algae drying.
In above-mentioned method, preferably, flocculation agent is inorganic flocculating agent and organic floculant, and the addition of flocculation agent is the 0.8wt% ~ 3wt% of blue-green algae dry weight, and in flocculation agent, the mass ratio of inorganic flocculating agent and organic floculant is 10 ~ 15: 1.
In above-mentioned method, preferably, inorganic flocculating agent is one or more in polymerize aluminum chloride, polyaluminium sulfate, poly-ferric chloride, bodied ferric sulfate.
In above-mentioned method, preferably, organic floculant is polyacrylamide and/or dimethyl diallyl ammonium chloride.
In above-mentioned method, preferably, adopt pressure filter to carry out filter-press dehydration to blue-green algae in step (3), pressure filter employing hole aperture is the filter cloth of 8 ~ 25 μm.
In above-mentioned method, preferably, pressure filter is chamber-type press filter, plate-and-frame filter press or diaphragm filter press.
Innovative point of the present invention is:
The present invention adopts ultrasonic combined flocculation agent process blue-green algae, on the one hand because ultrasonic wave has higher energy, can in water deep discharge, produce the extreme condition such as high pressure and high temperature, the physics and chemistry character forming hydrophobic membrane material can be changed, destroy the avidity between the colloidal structure of blue-green algae, algae water, release Bound moisture, improves the dehydration property of blue-green algae; On the other hand, under hyperacoustic effect, the flocculating effect of flocculation agent improves, and capillary water absorbing time reduces greatly, and the capillary water slough being difficult in blue-green algae and planar water become the gravity water easily removed.
Compared with prior art, the invention has the advantages that:
(1) the present invention adopts ultrasonication blue-green algae, makes blue algae dewatering degree high, and the blue-green algae slag water ratio after dehydration is only 65 ~ 73%.The weight and volume of blue-green algae greatly reduces, and significantly reduces subsequent disposal expense, and is conducive to the follow-up disposal of blue-green algae.The ultrasonication effect of high strength, short period of time is better, and after process, the dewatering of blue-green algae improves greatly, and precipitation threshold is good.Cross high strength, cross long ultrasonication, the dehydration property of blue-green algae can weaken on the contrary.
(2) the present invention adopts pressure filter to carry out filter-press dehydration to blue-green algae, and the filter cloth that hole aperture is minimum is housed in pressure filter; Blue-green algae is after the HCl dropwise oxide treatment of microwave, and filter cloth not easily blocks, and not only speed of filter pressing is fast, and solid recovery rate is up to more than 95%.
(3) after the present invention carries out processed to blue-green algae, calorific value is declined by less than 2%, is highly suitable for compost, mummification, burning, production biomass fuel.
(4) less investment needed for simple, easy to operate, the equipment of the inventive method technique, and running cost is lower, dewatering time is short, and processing speed is fast, is convenient to large-scale industrial production.
Accompanying drawing explanation
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, clear, complete description is carried out to the technical scheme in the embodiment of the present invention.
Fig. 1 be in the embodiment of the present invention 3 the different sound intensity to the influence curve figure of blue-green algae water ratio after the blue-green algae capillary water absorbing time after process and dehydration.
Fig. 2 be in the embodiment of the present invention 4 different acoustic density to the influence curve figure of blue-green algae water ratio after the blue-green algae capillary water absorbing time after process and dehydration.
Fig. 3 be in the embodiment of the present invention 5 different ultrasonic treatment time to the influence curve figure of blue-green algae water ratio after the blue-green algae capillary water absorbing time after process and dehydration.
Embodiment
Below in conjunction with Figure of description and concrete preferred embodiment, the invention will be further described, but protection domain not thereby limiting the invention.
Embodiment
The material adopted in following examples and instrument are commercially available.
embodiment 1
A method for blue algae dewatering, comprises the following steps:
(1) ultrasonic: to be 50kHz by the blue-green algae salvaged (the blue-green algae initial aqueous rate salvaged is 98%) through ultrasonic frequency, sound intensity 0.7W/cm
2, the ultrasonication 3min of acoustic density 0.8W/ml.
(2) flocculation agent is added: the ratio being blue-green algae dry weight 2% in quality in the blue-green algae after ultrasonic adds bodied ferric sulfate, and stirs, and obtains the blue-green algae being added with flocculation agent.
(3) filter-press dehydration: will be added with the blue-green algae of flocculation agent in step (2) through diaphragm filter press filter-press dehydration, this diaphragm filter press filter cloth hole aperture is 20 μm, completes blue algae dewatering.
The capillary water absorbing time 89s of untreated blue-green algae in the present embodiment, dry base heat value is 19.89 MJ/kg.Blue-green algae capillary water absorbing time after step (2) process of embodiment 1 is 32s, the blue-green algae water ratio 70% after dehydration, solid recovery rate 97.2%, dry base heat value 19.62 MJ/kg.
embodiment 2
A method for blue algae dewatering, comprises the following steps:
(1) ultrasonic: to be 80kHz by the blue-green algae salvaged (the blue-green algae initial aqueous rate salvaged is 95%) through frequency, sound intensity 0.6W/cm
2, the ultrasonication 4min of acoustic density 0.5W/ml.
(2) flocculation agent is added: the ratio being blue-green algae dry weight 4% in quality in the blue-green algae after ultrasonic adds polymerize aluminum chloride, and stirs, and obtains the blue-green algae being added with flocculation agent.
(3) filter-press dehydration: will be added with the blue-green algae of flocculation agent in step (2) through plate-and-frame filter press filter-press dehydration, this filter cloth for plate-frame type filter presses hole aperture is about 10 μm, completes blue algae dewatering.
The capillary water absorbing time 365s of untreated blue-green algae in the present embodiment, dry base heat value 20.48 MJ/kg.Blue-green algae capillary water absorbing time after step (2) process of embodiment 2 is 68s, the blue-green algae water ratio 68% after dehydration, solid recovery rate 98.4%, dry base heat value 20.03 MJ/kg.
embodiment 3
A method for blue algae dewatering, comprises the following steps:
(1) ultrasonic: to be 110kHz by the blue-green algae salvaged (the blue-green algae initial aqueous rate salvaged is 99%) through frequency, the sound intensity is respectively 0 ~ 1.2W/cm
2, the ultrasonication 5min of acoustic density 0.7W/ml.
(2) flocculation agent is added: the ratio being blue-green algae dry weight 1% in quality in the blue-green algae after ultrasonic adds poly-ferric chloride, and stirs, and obtains the blue-green algae being added with flocculation agent.
(3) filter-press dehydration: will be added with the blue-green algae of flocculation agent in step (2) through chamber-type press filter filter-press dehydration, this chamber-type press filter filter cloth hole aperture is 15 μm, completes blue algae dewatering.
The capillary water absorbing time 76s of untreated blue-green algae in the present embodiment.Blue-green algae capillary water absorbing time after step (2) process of embodiment 3 and the blue-green algae water ratio after dehydration are see Fig. 1.
As can be known from Fig. 1, the sound intensity is adopted to be 0.4 ~ 0.8W/cm
2ultrasonication, the dehydration rate of blue-green algae is higher.
embodiment 4
A method for blue algae dewatering, comprises the following steps:
(1) ultrasonic: to be 30kHz by the blue-green algae salvaged (the blue-green algae initial aqueous rate salvaged is 98%) through frequency, sound intensity 0.8W/cm
2, the ultrasonication 6min of acoustic density difference 0 ~ 1.5W/ml.
(2) flocculation agent is added: the ratio being blue-green algae dry weight 5% in quality in the blue-green algae after ultrasonic adds polyaluminium sulfate, and stirs, and obtains the blue-green algae being added with flocculation agent.
(3) filter-press dehydration: the blue-green algae of flocculation agent will be added with in step (2) through plate-and-frame filter press filter-press dehydration.This filter cloth for plate-frame type filter presses hole aperture is about 25 μm, completes blue algae dewatering.
The capillary water absorbing time 107s of untreated blue-green algae in the present embodiment, the blue-green algae capillary water absorbing time after step (2) process of embodiment 4 and the blue-green algae water ratio after dehydration are see Fig. 2.
As can be known from Fig. 2: adopt acoustic density to be the ultrasonication of 0.3W/ml ~ 1.0W/ml, the dehydration rate of blue-green algae is higher.
embodiment 5
A method for blue algae dewatering, comprises the following steps:
(1) ultrasonic: to be 90kHz by the blue-green algae salvaged (the blue-green algae initial aqueous rate salvaged is 97%) through frequency, sound intensity 0.5W/cm
2, the ultrasonication 0 ~ 10min of acoustic density 0.7W/ml.
(2) flocculation agent is added: the ratio being blue-green algae dry weight 0.3% in quality in the blue-green algae after ultrasonic adds dimethyl diallyl ammonium chloride, and stirs, and obtains the blue-green algae being added with flocculation agent.
(3) filter-press dehydration: will be added with the blue-green algae of flocculation agent in step (2) through diaphragm filter press filter-press dehydration, this diaphragm filter press filter cloth hole aperture is about 18 μm, completes blue algae dewatering.
The capillary water absorbing time 187s of untreated blue-green algae in the present embodiment, the blue-green algae capillary water absorbing time after step (2) process of embodiment 5 and the blue-green algae water ratio after dehydration are see Fig. 3.
As can be known from Fig. 3: ultrasonic treatment time is 2 ~ 6min, and the dehydration rate of blue-green algae is higher.
embodiment 6
A method for blue algae dewatering, comprises the following steps:
(1) ultrasonic: to be 40kHz by the blue-green algae salvaged (the blue-green algae initial aqueous rate salvaged is 96%) through frequency, sound intensity 0.7W/cm
2, the ultrasonication 5min of acoustic density 0.6W/ml.
(2) flocculation agent is added: the ratio being blue-green algae dry weight 0.05% in quality in the blue-green algae after ultrasonic adds polyacrylamide, and stirs, and obtains the blue-green algae being added with flocculation agent.
(3) filter-press dehydration: will be added with the blue-green algae of flocculation agent in step (2) through chamber-type press filter filter-press dehydration, this chamber-type press filter filter cloth hole aperture is about 8 μm, completes blue algae dewatering.
The capillary water absorbing time 251s of untreated blue-green algae in the present embodiment, dry base heat value 20.15 MJ/kg.Blue-green algae capillary water absorbing time after step (2) process of embodiment 6 is 64s, the blue-green algae water ratio 70% after dehydration, solid recovery rate 98.4%, dry base heat value 19.89MJ/kg.
embodiment 7
A method for blue algae dewatering, comprises the following steps:
(1) ultrasonic: to be 60kHz by the blue-green algae salvaged (the blue-green algae initial aqueous rate salvaged is 95%) through frequency, sound intensity 0.4W/cm
2, the ultrasonication 5min of acoustic density 0.9W/ml.
(2) flocculation agent is added: the ratio being blue-green algae dry weight 0.2% in quality in the blue-green algae after ultrasonic adds polyacrylamide, and stirs.
(3) filter-press dehydration: will be added with the blue-green algae of flocculation agent in step (2) through chamber-type press filter filter-press dehydration, this chamber-type press filter filter cloth hole aperture is 10 μm, completes blue algae dewatering.
The capillary water absorbing time 347s of untreated blue-green algae, dry base heat value 19.85MJ/kg in the present embodiment.Blue-green algae capillary water absorbing time after step (2) process of embodiment 7 is 85s, the blue-green algae water ratio 71% after dehydration, solid recovery rate 97.9%, dry base heat value 19.62MJ/kg.
embodiment 8
A method for blue algae dewatering, comprises the following steps:
(1) ultrasonic: to be 60kHz by the blue-green algae salvaged (the blue-green algae initial aqueous rate salvaged is 95%) through frequency, sound intensity 0.4W/cm
2, the ultrasonication 5min of acoustic density 0.9W/ml.
(2) flocculation agent is added: the ratio being blue-green algae dry weight 0.8% in quality in the blue-green algae after ultrasonic adds inorganic organic floculant, and this inorganic organic floculant is made up of bodied ferric sulfate and polyacrylamide, and its mass ratio is 10: 1, and stirs.
(3) filter-press dehydration: will be added with the blue-green algae of flocculation agent in step (2) through chamber-type press filter filter-press dehydration, this chamber-type press filter filter cloth hole aperture is 10 μm, completes blue algae dewatering.
The capillary water absorbing time 347s of untreated blue-green algae, dry base heat value 19.85MJ/kg in the present embodiment.Blue-green algae capillary water absorbing time after step (2) process of embodiment 8 is 76s, the blue-green algae water ratio 76% after dehydration, solid recovery rate 98.3%, dry base heat value 19.71MJ/kg.
embodiment 9
A method for blue algae dewatering, comprises the following steps:
(1) ultrasonic: to be 60kHz by the blue-green algae salvaged (the blue-green algae initial aqueous rate salvaged is 95%) through frequency, sound intensity 0.4W/cm
2, the ultrasonication 5min of acoustic density 0.9W/ml.
(2) flocculation agent is added: the ratio being blue-green algae dry weight 3% in quality in the blue-green algae after ultrasonic adds inorganic organic floculant, and this inorganic organic floculant is made up of polymerize aluminum chloride and dimethyl diallyl ammonium chloride, and its mass ratio is 15: 1, and stirs.
(3) filter-press dehydration: will be added with the blue-green algae of flocculation agent in step (2) through chamber-type press filter filter-press dehydration, this chamber-type press filter filter cloth hole aperture is 10 μm, completes blue algae dewatering.
The capillary water absorbing time 347s of untreated blue-green algae, dry base heat value 19.85MJ/kg in the present embodiment.Blue-green algae capillary water absorbing time after step (2) process of embodiment 9 is 79s, the blue-green algae water ratio 77% after dehydration, solid recovery rate 98.4%, dry base heat value 19.64MJ/kg.
In embodiment 1 to 9, inorganic flocculating agent addition be the 1wt% ~ 5wt% of blue-green algae dry weight; Organic floculant is the 0.05wt% ~ 0.3wt% of blue-green algae drying; The addition of inorganic organic floculant is the 0.8wt% ~ 3wt% of blue-green algae dry weight, all can implement, and reaches same or analogous technique effect.
comparative example 1
A method for blue algae dewatering, comprises the following steps:
(1) flocculation agent is added: the ratio being blue-green algae dry weight 2% in quality in the blue-green algae salvaged (the blue-green algae initial aqueous rate salvaged is 98%) adds bodied ferric sulfate, and stirs, and obtains the blue-green algae being added with flocculation agent.
(2) filter-press dehydration: will be added with the blue-green algae of flocculation agent in step (1) through diaphragm filter press filter-press dehydration, this diaphragm filter press filter cloth hole aperture is 20 μm, completes blue algae dewatering.
The capillary water absorbing time 89s of untreated blue-green algae in comparative example 1, dry base heat value 19.89 MJ/kg.Blue-green algae capillary water absorbing time after step (1) process of comparative example 1 is 48s, the blue-green algae water ratio 87% after dehydration, solid recovery rate 96.3%, dry base heat value 19.74 MJ/kg.
comparative example 2
A method for blue algae dewatering, comprises the following steps:
(1) flocculation agent is added: the ratio being blue-green algae dry weight 0.05% in quality in the blue-green algae salvaged (the blue-green algae initial aqueous rate salvaged is 96%) adds polyacrylamide, and stirs, and obtains the blue-green algae being added with flocculation agent.
(2) filter-press dehydration: will be added with the blue-green algae of flocculation agent in step (2) through chamber-type press filter filter-press dehydration, this chamber-type press filter filter cloth hole aperture is about 8 μm, completes blue algae dewatering.
The capillary water absorbing time 251s of untreated blue-green algae in comparative example 2, dry base heat value 20.15 MJ/kg.Blue-green algae capillary water absorbing time after step (1) process of comparative example 2 is 108s, the blue-green algae water ratio 85% after dehydration, solid recovery rate 96.7%, dry base heat value 19.95MJ/kg.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to the present invention.Although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention.Any those of ordinary skill in the art, when not departing from spirit of the present invention and technical scheme, the Method and Technology content of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solution of the present invention, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent replacement, equivalence change and modification, all still belongs in the scope of technical solution of the present invention protection.
Claims (10)
1. a blue algae dewatering method, is characterized in that, comprises the following steps:
(1) ultrasonic: blue-green algae is carried out ultrasonication;
(2) flocculation agent is added: in the blue-green algae after ultrasonic, add the blue-green algae that flocculation agent obtains being added with flocculation agent;
(3) filter-press dehydration: the blue-green algae being added with flocculation agent is carried out filter-press dehydration, completes blue algae dewatering step.
2. blue algae dewatering method according to claim 1, is characterized in that, the frequency of described ultrasonication is 30 ~ 110kHz, and the sound intensity is 0.4 ~ 0.8W/cm
2, acoustic density is 0.3W/ml ~ 1.0W/ml.
3. blue algae dewatering method according to claim 1, is characterized in that, the time of described ultrasonication is 2 ~ 6min.
4. blue algae dewatering method according to claim 1, is characterized in that, described flocculation agent is inorganic flocculating agent or organic floculant, and the addition of described inorganic flocculating agent is the 1wt% ~ 5wt% of blue-green algae dry weight; The addition of described organic floculant is the 0.05wt% ~ 0.3wt% of blue-green algae drying.
5. blue algae dewatering method according to claim 1, it is characterized in that, described flocculation agent is inorganic flocculating agent and organic floculant, and the addition of described flocculation agent is the 0.8wt% ~ 3wt% of blue-green algae dry weight, and in described flocculation agent, the mass ratio of inorganic flocculating agent and organic floculant is 10 ~ 15: 1.
6. the blue algae dewatering method according to claim 4 or 5, is characterized in that, described inorganic flocculating agent is one or more in polymerize aluminum chloride, polyaluminium sulfate, poly-ferric chloride, bodied ferric sulfate.
7. the blue algae dewatering method according to claim 4 or 5, is characterized in that, described organic floculant is polyacrylamide and/or dimethyl diallyl ammonium chloride blue algae dewatering.
8. blue algae dewatering method according to claim 1, is characterized in that, adopts pressure filter to carry out filter-press dehydration to blue-green algae in step (3).
9. blue algae dewatering method according to claim 8, is characterized in that, described pressure filter employing hole aperture is the filter cloth of 8 ~ 25 μm.
10. blue algae dewatering method according to claim 8 or claim 9, it is characterized in that, described pressure filter is chamber-type press filter, plate-and-frame filter press or diaphragm filter press.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105693063A (en) * | 2016-01-26 | 2016-06-22 | 江苏省环境科学研究院 | Deep dehydration and desiccation method of blue-green algae |
| CN108275853A (en) * | 2018-01-16 | 2018-07-13 | 航天凯天环保科技股份有限公司 | A kind of heavy metal pollution high speed dewatering of slurries system and its method for heavy metal pollution high speed dewatering of slurries |
| CN110563308A (en) * | 2019-09-26 | 2019-12-13 | 江南大学 | Blue algae mud deep dehydration method based on capsular polysaccharide soft lattice thermal rearrangement |
| CN111689607A (en) * | 2020-06-18 | 2020-09-22 | 常州大学 | Method for chemically coagulating blue algae in lake water |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105693063A (en) * | 2016-01-26 | 2016-06-22 | 江苏省环境科学研究院 | Deep dehydration and desiccation method of blue-green algae |
| US20170211038A1 (en) * | 2016-01-26 | 2017-07-27 | Jiangsu Provincial Academy Of Environmental Science | Method for deep dehydration and desiccation of cyanobacteria |
| CN105693063B (en) * | 2016-01-26 | 2018-06-12 | 江苏省环境科学研究院 | A kind of cyanobacteria deep dehydration and the method for desiccation |
| US10457910B2 (en) * | 2016-01-26 | 2019-10-29 | Jiangsu Provincial Academy Of Environmental Science | Method for deep dehydration and desiccation of cyanobacteria |
| CN108275853A (en) * | 2018-01-16 | 2018-07-13 | 航天凯天环保科技股份有限公司 | A kind of heavy metal pollution high speed dewatering of slurries system and its method for heavy metal pollution high speed dewatering of slurries |
| CN110563308A (en) * | 2019-09-26 | 2019-12-13 | 江南大学 | Blue algae mud deep dehydration method based on capsular polysaccharide soft lattice thermal rearrangement |
| CN110563308B (en) * | 2019-09-26 | 2021-10-08 | 江南大学 | Blue algae mud deep dehydration method based on capsular polysaccharide soft lattice thermal rearrangement |
| CN111689607A (en) * | 2020-06-18 | 2020-09-22 | 常州大学 | Method for chemically coagulating blue algae in lake water |
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