CN108529728A

CN108529728A - A kind of dense media/oxidant coupling broken wall formula flocculant and its preparation method and application

Info

Publication number: CN108529728A
Application number: CN201810449809.0A
Authority: CN
Inventors: 李登新; 郭启浩; 马颖潇; 郭庆峰; 袁晓玲; 王雅萌; 刘二燕
Original assignee: Donghua University
Current assignee: Donghua University; National Dong Hwa University
Priority date: 2018-05-11
Filing date: 2018-05-11
Publication date: 2018-09-14

Abstract

The present invention relates to a kind of dense media/oxidants to couple broken wall formula flocculant and its preparation method and application, and flocculant includes porous dense media and oxidant；Preparation method includes：Oxidant is dissolved in water, dense media is added, and is stirred after vacuumizing, it is dry to get；Flocculant is applied to sewage disposal.The present invention improves dehydration efficiency by destroying the structure of the cell wall of microorganism or change cell in sludge；It compresses sludge cake moisture content and is less than 60%, sludge fuel stick can be less than 10%；The nitrogenous liquid of height that broken wall generates can be used as the raw material of plant nutrition liquid or soil conditioner, impurity in sludge is attached to surface and the pore interior of dense media, in sedimentation, since the density of dense media is more than the density of sewage, impurity settles together with dense media, and sludge settlement rate is fast.

Description

A kind of dense media/oxidant coupling broken wall formula flocculant and its preparation method and application

Technical field

The invention belongs to flocculant and its preparation method and application field, more particularly to a kind of dense media/oxidant coupling Broken wall formula flocculant and its preparation method and application.

Background technology

Organic flocculant performance is stablized, and flocculating effect is good, but expensive, and the residual monomer of this kind of high polymer has " three cause " effect (causing rugged, carcinogenic, mutagenesis)；Traditional inorganic flocculating agent stability is poor, and flocculating effect is general, but price is just Preferably, demand is high；But the sludge that inorganic flocculating agent flocculates passes through press filtration, it is necessary to by means of additives such as lime Or sludge cake moisture content could be reduced to 60% by lime with high pressure, but the non-combustible part of dewatered sludge increases by 25~50%, even Taller, burning flying dust and lime-ash are significantly increased, and reduce sludge ultimate disposal effect, improve processing cost, this technology is caused to lack Caused by sunken reason is existing flocculant design principle.

Existing flocculant theoretical foundation is：" coalescence " is theoretical.Flocculant mainly carries positive (negative) electrical group and water In it is close to each other with negative (just) electrical some particles for being difficult to detach or particle, reduce its potential, be at shakiness Determine state, using its coalescence property agglomeration, and is separated by physics or chemical method.It generates with this method For sludge aqueous up to 80% after press filtration, this brings very big influence to follow-up sludge treatment technique.

Invention content

Technical problem to be solved by the invention is to provide a kind of dense media/oxidant coupling broken wall formula flocculant and its systems Preparation Method and application, the flocculant not only have coalescence ability, and have and abolish microorganism wall or change cell knot The function of structure substantially reduces filter press cake moisture content.

The present invention a kind of dense media/oxidant couple broken wall formula flocculant, the flocculant include porous dense media and Oxidant, oxidant account for the 0.1%-80% of porous dense media and oxidant gross mass.

The oxidant is attached to the pore surface of porous dense media.

The dense media is at least one of flyash, sand, biogum.

The dense media grain size is 60-200 mesh.

The oxidant is persulfate.

The persulfate is one or more of sodium peroxydisulfate, potassium peroxydisulfate, hydrogen persulfate sodium, potassium hydrogen persulfate.

A kind of preparation method of dense media of the present invention/oxidant coupling broken wall formula flocculant, including：

Oxidant is dissolved in water, oxidizing agent solution is obtained, dense media is added, and stirred after vacuumizing, it is dry, it obtains Broken wall formula flocculant, wherein a concentration of 50~400g/L of oxidizing agent solution, the dosage of dense media are coupled to dense media/oxidant For 100~4000g/L.

The mixing time is 20-40min.

The drying temperature is 60~100 DEG C.

A kind of dense media of the present invention/oxidant coupling broken wall formula flocculant is applied to sewage disposal, the specific steps are：

Dense media/oxidant coupling broken wall formula flocculant is put by 2%~5% mass concentration in sewage, according to dirt Regimen condition is stirred to react 4~8 hours, is precipitated 30~60 minutes.

A kind of dense media of the present invention/oxidant couples broken wall formula flocculant during treated sewage, in flocculant Oxidant is dissolved in water, and the potentiometric titrations (SO of strong oxidizing property is generated in sewage₄ ^-), utilize what is generated in reaction As organic contamination in primary oxidizers oxygenolysis and mineralized water so that the cell wall rupture of microorganism releases organic matter； Dense media in flocculant can adsorb pollutant, in infall process, be attached to the pollutant on dense media with dense media one And it settles, accelerated sedimentation process.

Advantageous effect

(1) present invention improves dehydration efficiency by destroying the structure of the cell wall of microorganism or change cell in sludge； It compresses sludge cake moisture content and is less than 60%, sludge fuel stick can be less than 10%, and flocculation time shortens 20%~30%；Broken wall generates The nitrogenous liquid of height can be used as the raw material of plant nutrition liquid or soil conditioner.Impurity in sludge is attached to the surface of dense media And pore interior, in sedimentation, since the density of dense media is more than the density of sewage, impurity settles together with dense media, dirty The mud rate of settling is fast.

(2) the present invention is directed to overcome existing inorganic matter flocculant disadvantage, be fully solved sludge flocculation dehydration and it is final efficiently Pollution-free problem of complex utilization.

Specific implementation mode

Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, people in the art Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited Range.

Embodiment 1

The sodium peroxydisulfate for weighing 50g, is dissolved in 1L water, then weighs the flyash that 100g grain sizes are 60 mesh, pours into It states in solution, vacuum condition keeps 1min, then by magnetic stirrer 30min, drying, is prepared under the conditions of 80 DEG C Dense media/oxidant couples broken wall formula flocculant.Dehydration efficiency can be improved in this broken wall formula flocculant, for Shanghai Songjiang sewage The sewage disposal for the treatment of plant, sewage disposal the specific steps are：Broken wall formula flocculant is put by 5% mass concentration in sewage, It is stirred to react 8 hours, is precipitated 30 minutes according to sewage situation.Sludge cake moisture content is compressed after sewage disposal is less than 60%, sedimentation Time shortens 30%.

Embodiment 2

The hydrogen persulfate sodium for weighing 100g, is dissolved in 1L water, then weighs the flyash that 200g grain sizes are 100 mesh, Enter in above-mentioned solution, vacuum condition keeps 1min, then passes through magnetic stirrer 30min, dry under the conditions of 80 DEG C, preparation Obtain dense media/oxidant coupling broken wall formula flocculant.Dehydration efficiency can be improved in this broken wall formula flocculant, for Shanghai Songjiang The sewage disposal of sewage treatment plant, sewage disposal the specific steps are：Broken wall formula flocculant is put into dirt by 2% mass concentration In water, it is stirred to react 4 hours according to sewage situation；Precipitation 60 minutes.Sludge cake moisture content is compressed after sewage disposal is less than 60%, Sedimentation time shortens 20%.

Embodiment 3

The potassium hydrogen persulfate for weighing 200g, is dissolved in 1L water, then weighs the biogum that 200g grain sizes are 60 mesh, pours into In above-mentioned solution, vacuum condition keeps 1min, then passes through magnetic stirrer 30min, dry under the conditions of 100 DEG C, preparation Obtain dense media/oxidant coupling broken wall formula flocculant.Dehydration efficiency can be improved in this broken wall formula flocculant, for Shanghai Songjiang The sewage disposal of sewage treatment plant, sewage disposal the specific steps are：Broken wall formula flocculant is put into dirt by 3% mass concentration It in water, is stirred to react 6 hours, is precipitated 60 minutes according to sewage situation.Sludge cake moisture content is compressed after sewage disposal is less than 55%, Sedimentation time shortens 30%.

The above, only presently preferred embodiments of the present invention, not to the present invention in any form with substantial limitation, It should be pointed out that for those skilled in the art, under the premise of not departing from the method for the present invention, can also make Several improvement and supplement, these are improved and supplement also should be regarded as protection scope of the present invention.All those skilled in the art, Without departing from the spirit and scope of the present invention, when made using disclosed above technology contents it is a little more Dynamic, modification and the equivalent variations developed, are the equivalent embodiment of the present invention；Meanwhile all substantial technologicals pair according to the present invention The variation, modification and evolution of any equivalent variations made by above-described embodiment, still fall within the range of technical scheme of the present invention It is interior.

Claims

1. a kind of dense media/oxidant couples broken wall formula flocculant, which is characterized in that the flocculant include porous dense media and Oxidant, oxidant account for the 0.1%-80% of porous dense media and oxidant gross mass.

2. a kind of dense media described in accordance with the claim 1/oxidant couples broken wall formula flocculant, which is characterized in that the oxygen Agent is attached to the pore surface of porous dense media.

3. a kind of dense media described in accordance with the claim 1/oxidant couples broken wall formula flocculant, which is characterized in that described heavy Medium is at least one of flyash, sand, biogum.

4. coupling broken wall formula flocculant according to a kind of dense media described in claim 1 or 3/oxidant, which is characterized in that described Dense media grain size is 60-200 mesh.

5. a kind of dense media described in accordance with the claim 1/oxidant couples broken wall formula flocculant, which is characterized in that the oxygen Agent is persulfate.

6. a kind of dense media/oxidant couples broken wall formula flocculant according to claim 5, which is characterized in that the mistake Sulfate is one or more of sodium peroxydisulfate, potassium peroxydisulfate, hydrogen persulfate sodium, potassium hydrogen persulfate.

7. a kind of preparation method of dense media/oxidant coupling broken wall formula flocculant, including：

Oxidant is dissolved in water, oxidizing agent solution is obtained, dense media is added, and stirred after vacuumizing, it is dry, obtain weight Medium/oxidant couples broken wall formula flocculant, and wherein a concentration of 50~400g/L of oxidizing agent solution, the dosage of dense media is 100~4000g/L.

8. a kind of preparation method of dense media/oxidant coupling broken wall formula flocculant, feature exist according to claim 7 In the mixing time is 20-40min.

9. a kind of preparation method of dense media/oxidant coupling broken wall formula flocculant, feature exist according to claim 7 In the drying temperature is 60~100 DEG C.

10. a kind of application of dense media as described in claim 1/oxidant coupling broken wall formula flocculant, which is characterized in that answer For sewage disposal, the specific steps are：Dense media/oxidant coupling broken wall formula flocculant is thrown by 2%~5% mass concentration Enter in sewage, be stirred to react 4~8 hours, precipitates 30~60 minutes.