CN104926075A - Excess sludge deep dehydration conditioner - Google Patents
Excess sludge deep dehydration conditioner Download PDFInfo
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- CN104926075A CN104926075A CN201510316084.4A CN201510316084A CN104926075A CN 104926075 A CN104926075 A CN 104926075A CN 201510316084 A CN201510316084 A CN 201510316084A CN 104926075 A CN104926075 A CN 104926075A
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- mud
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Abstract
The invention discloses an excess sludge deep dehydration conditioner, and belongs to the technical field of sludge treatment. Rice hull powder is adopted as the sludge dehydration conditioner, so that the defects that at present, FeCl3 and CaO can corrode incineration facilities, and incineration is influenced along with the reduction of organic matters are overcome; compared with a manner that chemical conditioners or wood chips are used, the effect of rice hull powder is better, the raw materials source is wide, the price is low, and the problem of how to realize waste resource utilization of rice hull powder in the prior art can also be solved.
Description
Technical field
The present invention relates to a kind of excess sludge deep dehydration amendment, belong to technical field of sludge treatment.
Background technology
In " 12 " latter stage, China's urban wastewater treatment firm will reach 4000, the construction of sewage work puts into operation and supervenes a large amount of excess sludges, in water ratio 80%, year mud total generation in the whole nation is very soon by breakthrough 3,000 ten thousand tons, expect the year two thousand twenty China sludge yield and will break through year 6000 ten thousand tons, simultaneously, due to mud sand content and heavy metal concentration higher, by remarkably influenced anaerobic sludge digestion effect and soil utilizating effect, the disposal options of sludge incineration is therefore adopted comparatively to be suitable for.When carrying out sludge incineration disposal, the general deep dehydration mode adopting chemical conditioning, chemical conditioning is by adding iron(ic) chloride (FeCl
3), polyacrylamide (PAM) and calcium oxide (CaO) three kinds of amendment lignin-sludges, but it is large to there is amendment dosage, corrosion burning facility, organic minimizing and calorific value reduction etc. are unfavorable for the problems such as burning, the development of restriction sludge incineration technology.In addition, China utilizes level still lower to rice husk, and the rice husk that even some enterprise produces has become overall situation source of pollution.
In order to promote to make the whole carbonization of mud organic substance, kill pathogenic agent, can reduce the development of the sludge incineration technology of sludge volume and Heavy Metal Pollution to greatest extent, need solution sludge conditioner dosage large, corrosion burning facility, organic minimizing and calorific value reduction are unfavorable for the problems such as burning.
Summary of the invention
In order to overcome above problem, the invention provides a kind of Novel sludge conditioning auxiliary agent, investigate its impact on the dewatering of mud and sludge incineration process, by controlling dosing condition and the dosing ratio of Novel sludge conditioning agent, for the through engineering approaches application of Novel sludge conditioning agent provides theoretical foundation and technical support.
Of the present inventionly provide a kind of deeply dehydrating sludge amendment, described amendment is that particle diameter is at 60-550 μm of (namely crossing 30-240 eye mesh screen) powdered rice hulls.
Described amendment, in one embodiment of the invention, the interpolation quality in sludge dehydration process is the 10%-60% of the solid amount of mud (i.e. dewatered sludge quality).
Described amendment, in one embodiment of the invention, for particle diameter is at the powdered rice hulls of 180-550 μm (namely crossing 30-80 eye mesh screen), the interpolation quality in sludge dehydration process is the 20%-40% of the solid amount of mud.
Described amendment in one embodiment of the invention, was the powdered rice hulls of 30 eye mesh screens, and the interpolation quality in sludge dehydration process is 30% of the solid amount of mud.
The present invention also provides a kind of deep dehydration method for sludge.Described method comprises and being shaken up by mud, and then adding the particle diameter that quality accounts for the solid amount 10%-60% of mud is 60-550 μm of (namely crossing 30-240 eye mesh screen) powdered rice hulls, stirs conditioning, and then dewaters.
Described powdered rice hulls, in one embodiment of the invention, addition is the 20%-40% of the solid amount of mud, particle diameter is 180-550 μm (namely crossing 30-80 eye mesh screen).
Described dehydration in one embodiment of the invention, is adopt suction filtration or plate-and-frame filter press squeezing.
Described plate-and-frame filter press, in one embodiment of the invention, its squeezing condition is: feed pressure is 0.5 ~ 0.8Mpa, and the time is 25 ~ 30min, and squeeze pressure is 1.5-2.0Mpa, and the time is 30-60min.
Described method, in one embodiment of the invention, also comprises the PAM adding 0.2-0.4mg by the solid amount of every 100g mud.
Described PAM in one embodiment of the invention, is be mixed with the solution that massfraction is 0.1%, is then added in mud by the 0.2-0.4% of dewatered sludge quality and carries out conditioning dehydration.
Described method, in one embodiment of the invention, specifically: (1) gets mud, conditioning of mud water ratio is adjusted to 95%; (2) add the rice husk of 30% and the PAM of 0.3% of the solid amount of mud, wherein PAM is the solution of 0.1%; Nurse one's health, stir; (3) mud modified after, adopt plate-and-frame filter press dewater, the working conditions of plate-and-frame filter press is: feed pressure is 0.5 ~ 0.8Mpa, and the time is 25 ~ 30min, and squeeze pressure is 1.8Mpa, and the time is 40min.
Beneficial effect of the present invention: adopt powdered rice hulls as sludge dehydration conditioner, can deep dehydration be realized, after the sludge dewatering after conditioning, water ratio is in 60% effect; Can avoid using CaO, compared with use CaO, organic content increases 33%, and calorific value improves 26% simultaneously, overcomes that current CaO can corrode burning facility, organic minimizing is unfavorable for the defects such as burning; In addition, compare and use wood chip as amendment, powdered rice hulls better effects if, after sludge dewatering, resistivity reduces 3-15%, water ratio reduces 2-10%, and raw material sources are extensive, cheap, can also solve the problem of current powdered rice hulls utilization of waste as resource.
Embodiment
Parametric measurement method
(1) mud organic composition measures
Protein determination
Suction filtration liquid is extracted by 0.22 μm of membrane filtration with needle tubing, extract the filtered suction filtration liquid of 1mL and 1mL distilled water successively, add 5mL Coomassie Brillant Blue solution respectively again, shake up (note: slowly rock, in order to avoid produce bubble, cause error), place 2min, colorimetric estimation under 595nm, record data. often group test repetition twice, reduces error.
Polysaccharide determination
Suction filtration liquid is extracted by 0.22 μm of membrane filtration with needle tubing, extract the filtered suction filtration liquid of 1mL and 1mL distilled water successively, add 5mL anthrone solution more respectively, shake up, put into cold water and cool, after cooling in water-bath boiling water bath 10min, take out and cool in cold water, colorimetric estimation under 620nm, record data. often group test repetition twice, reduces error.
(2) resistivity measures
The meaning of sludge specific resistance refers to the pressure size in the unit filtration area that the mud of unit mass is subject to when filtering under certain pressure effect.Sludge specific resistance is obtained by following formula:
R in formula: the pressure size in the unit filtration area be subject to when the mud of unit mass filters under certain pressure effect, i.e. resistivity, (m/kg); V: filtrate volume, (m
3); T: suction filtration time, (s); B: about the slope of the linear equation of V and t/V; C: the solid weight that the filtrate medium of filter unit volume retains, (kg); P: suction filtration pressure, (N/m
2); m
1: the sludge filter cake quality obtained after suction filtration, (kg); P: moisture percentage in sewage sludge; μ: filtrate viscosity, (N*S/m
2); A: suction filtration surface-area, (m
2).
(3) measurement of water-content coefficient
After the implication of water ratio refers to suction filtration, in filter cake, water accounts for the ratio of filter cake quality.Can be obtained by following formula:
m in formula
1: the sludge filter cake quality obtained after suction filtration, (kg); m
2: the quality of sludge filter cake after 150 DEG C of baking 2h in baking oven, (kg).
(4) organic content measures
m in formula
3: the quality of sludge filter cake after 600 DEG C of calcination 2h in retort furnace, (kg).(5) sludge calorific value measures
Sludge calorific value refers to the mud perfect combustion time institute liberated heat of unit mass.First by mud 105 DEG C of oven dry in an oven, then mud is put into calorimeter measure.
Embodiment 1
Test mud takes from Hui Lian heat power plant, and former mud water ratio is 84.67%, before test, moisture percentage in sewage sludge is adjusted to 95%.Add 30% rice husk+0.3%PAM of the solid amount of mud, 30% rice husk+0.3%PAM+5%FeCl respectively
3, 30% lime+0.3%PAM+5%FeCl
3, PAM is the solution of 0.1%, FeCl
3be the solution of 33%.Squeeze with plate-and-frame filter press after stirring conditioning, wherein feed pressure is 0.5 ~ 0.8Mpa, and the time is 25 ~ 30min, and squeeze pressure is 1.8Mpa, and the time is 40min.After employing powdered rice hulls was 30 mesh sieves.Wherein main test index is moisture percentage in sewage sludge, organic content and calorific value, and result is as shown in table 1.
Table 1 powdered rice hulls dehydration experiment result
As known from Table 1,30% rice husk+0.3%PAM and 30% rice husk+0.3%PAM+5%FeCl is added
3after conditioning, sheet frame squeezing sludge cake water ratio is about 60%, comparatively close with current depth dehydrated sludge cake water ratio, but mud dry base heat value significantly improves after its interpolation powdered rice hulls, the rising of sludge calorific value is consistent with the rising trend of organic content, show that powdered rice hulls is as after dehydrating and conditioning agent, is comparatively suitable for carrying out incineration disposal.
Also compares at PAM and FeCl simultaneously
3under the condition that dosage is identical, use the dehydrating effect of the mud of wood chip and powdered rice hulls conditioning, result shows, with add compared with mud that wood chip nurses one's health, add the mud of powdered rice hulls conditioning, after sheet frame press dewatering, its water ratio about declines 9.7%, and organic and calorific value reduction of a fraction you can well imagine high 8.5% and 17.5%.Illustrate, powdered rice hulls is more suitable for as sludge dehydration conditioner than wood chip.
Embodiment 2
The present invention compares powdered rice hulls, lime to the impact of mud dry base heat value dry base heat value.Found that, along with the increase of CaO dosage, broken wall is there is in mud under high temperature, high pH effect, a large amount of organic matter is transferred in liquid phase, and its calorific value decreases, when dosage is 60%, be only 1600kJ/kg, decline 36%, although illustrate that use CaO can make water ratio reduce, CaO should not be adopted to dewater.But when adding powdered rice hulls, sludge calorific value raises gradually, on the one hand because powdered rice hulls is organic, add and calorific value can be made to raise, be because powdered rice hulls adds and only plays the effect of framework construction body on the other hand, sludge microbe cellularstructure can not be destroyed, make it be easy to incineration disposal.
In addition, rice husk, lime to be controlled oneself the impact surface of burning the water ratio upper limit on mud, and along with the increase of CaO dosage, it maintains to control oneself and burns water ratio and reduce gradually, shows that the mud through adding CaO conditioning dehydration is not suitable for carrying out incineration disposal; And after adding powdered rice hulls, it maintains to control oneself and burns water ratio and raise gradually, namely sludge dewatering to water ratio about 45% can be controlled oneself burnings, can greatly reduce amendment dosage, reduces dewatering pressure, effectively realizes object of saving energy and reduce the cost.
Embodiment 3
Get mud (water ratio 95%) in conditioning cup, add the rice husk (crossing 60 mesh sieves) that quality is 20% of the solid amount of mud, conditioning cup is placed on stirrer, first rapid stirring (300r/min) 5min, then low rate mixing (50r/min) 20min.After mud glass stick after conditioning stirs, carry out suction filtration, measure the parameters of mud after suction filtration, every battery of tests repeats twice, reduces error.Result shows, and sludge specific resistance is 2.9x10
13m/kg, filter cake moisture content are 82.3%, organic content is 67.2%, calorific value 2686kJ/kg.Under similarity condition, and add compared with mud that wood chip nurses one's health, add the mud of powdered rice hulls conditioning, its sludge specific resistance and filter cake moisture content reduce 3.3% and 2.5% respectively, and organic content and calorific value increase 12.2% and 11.3% respectively.
Embodiment 4
Get mud in conditioning cup, add the PAM solution (wherein in PAM solution, PAM massfraction is 0.1%) of rice husk that quality is 20% of the solid amount of mud (crossing 60 mesh sieves) and 0.4%.After stirring conditioning, sampling and measuring mud parameter.Then use plate-and-frame filter press squeezing, working conditions is: feed pressure is 0.5 ~ 0.8Mpa, and the time is 25 ~ 30min, and squeeze pressure is 2.0Mpa, and the time is 30min.
Result shows, and sludge specific resistance is 1.7x10
13m/kg, filter cake moisture content are 60.2%, organic content is 66.4%, calorific value 5220kJ/kg.Under similarity condition, and add compared with mud that wood chip nurses one's health, add the mud of powdered rice hulls conditioning, its sludge specific resistance and filter cake moisture content reduce 15.0% and 2.1% respectively, and organic content and calorific value increase 11.2% and 4.4% respectively.Meanwhile, feed time and squeezing time shorten 8-10min and 12-15min respectively.
Meanwhile, and do not add compared with powdered rice hulls, the mud suction filtration speed after powdered rice hulls conditioning and filtrate volume obviously raise.When but powdered rice hulls adds more than 50%, filtrate volume and suction filtration speed reduce on the contrary, decline 7.1% and 8.8% about respectively, show to add powdered rice hulls dosage excessive, the sludge dewatering time can be extended, reduce dehydration usefulness, this may be because the excessive finely ground particle substance that causes of increase of powdered rice hulls dosage also increases gradually, cause filter cloth to block, increase filtration resistance, thus be unfavorable for dehydration.
Embodiment 5
Get mud, add 40% rice husk (crossing 80 mesh sieves) and the 0.2%PAM (wherein in PAM solution, PAM massfraction is 0.1%) of the solid amount of mud respectively.Get 100mL after stirring conditioning and carry out suction filtration, after suction filtration, measure the parameters of mud.And using plate-and-frame filter press to squeeze, squeezing condition is: feed pressure is 0.5 ~ 0.8Mpa, and the time is 25 ~ 30min, and squeeze pressure is 1.5Mpa, and the time is 40min.
Sludge specific resistance is 1.6x10
13m/kg, filter cake moisture content are 59.8%, organic content is 68.1%, calorific value 5707kJ/kg.Under similarity condition, and add compared with mud that wood chip nurses one's health, add the mud of powdered rice hulls conditioning, its sludge specific resistance and filter cake moisture content reduce 9.6% and 5.2% respectively, and organic content and calorific value increase 5.5% and 7.1% respectively.Meanwhile, feed time and squeezing time shorten 10min and 10-15min respectively.
Meanwhile, the present invention finds, when adopting the powdered rice hulls being greater than 100 eye mesh screens, sludge specific resistance was higher, is unfavorable for dewatering, may be due to particle diameter less time, the increase of filtration resistance that mud is subject to, easily causes filter cake to block.
Although the present invention with preferred embodiment openly as above; but it is also not used to limit the present invention, any person skilled in the art, without departing from the spirit and scope of the present invention; all can do various changes and modification, what therefore protection scope of the present invention should define with claims is as the criterion.
Claims (10)
1. a deeply dehydrating sludge amendment, is characterized in that, described amendment is that particle diameter is at 60-550 μm of powdered rice hulls.
2. amendment according to claim 1, is characterized in that, the interpolation quality of described amendment in sludge dehydration process is the 10%-60% of the solid amount of mud.
3. amendment according to claim 1, is characterized in that, described amendment is particle diameter at the powdered rice hulls of 180-550 μm, and the interpolation quality in sludge dehydration process is the 20%-40% of the solid amount of mud.
4. a deep dehydration method for sludge, is characterized in that, described method comprises and being shaken up by mud, and then adding the particle diameter that quality accounts for the solid amount 10%-60% of mud is 60-550 μm of powdered rice hulls, stirs conditioning, and then dewaters.
5. method according to claim 4, is characterized in that, described powdered rice hulls addition is the 20%-40% of the solid amount of mud, particle diameter is 180-550 μm.
6. method according to claim 4, is characterized in that, described dehydration adopts suction filtration or plate-and-frame filter press squeezing.
7. method according to claim 6, is characterized in that, the squeezing condition of described plate-and-frame filter press is: feed pressure is 0.5 ~ 0.8Mpa, and the time is 25 ~ 30min, and squeeze pressure is 1.5-2.0Mpa, and the time is 30-60min.
8. method according to claim 4, is characterized in that, described method comprises the PAM adding 0.2-0.4mg by the solid amount of every 100g mud.
9. method according to claim 8, is characterized in that, described PAM is mixed with the solution that massfraction is 0.1%, is then added in mud by the 0.2-0.4% of dewatered sludge quality and carries out conditioning dehydration.
10. method according to claim 4, is characterized in that, described method specifically: (1) gets mud, and conditioning of mud water ratio is adjusted to 95%; (2) add quality and account for the rice husk of 30% of the solid amount of mud and the PAM solution of 0.3%, wherein PAM solution to be PAM massfraction be 0.1% solution; Nurse one's health, stir; (3) mud modified after, adopt plate-and-frame filter press dewater, the working conditions of plate-and-frame filter press is: feed pressure is 0.5 ~ 0.8Mpa, and the time is 25 ~ 30min, and squeeze pressure is 1.8Mpa, and the time is 40min.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107352762A (en) * | 2017-08-03 | 2017-11-17 | 惠安县威科电子科技有限公司 | A kind of medicament of Treating Municipal Sewage factory sludge and preparation method thereof |
| CN110526551A (en) * | 2019-09-06 | 2019-12-03 | 中交上海航道勘察设计研究院有限公司 | A kind of sludge dewatering and solidifying agent and resource utilization method |
| CN110642494A (en) * | 2019-09-30 | 2020-01-03 | 齐鲁工业大学 | Application of biomass ash as framework construction body in sludge dewatering and method for improving dewatering performance of papermaking excess sludge |
| CN113149694A (en) * | 2021-06-09 | 2021-07-23 | 广东绿友环保科技有限公司 | Method for preparing high-strength ceramic tile from activated sludge |
-
2015
- 2015-06-10 CN CN201510316084.4A patent/CN104926075A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107352762A (en) * | 2017-08-03 | 2017-11-17 | 惠安县威科电子科技有限公司 | A kind of medicament of Treating Municipal Sewage factory sludge and preparation method thereof |
| CN110526551A (en) * | 2019-09-06 | 2019-12-03 | 中交上海航道勘察设计研究院有限公司 | A kind of sludge dewatering and solidifying agent and resource utilization method |
| CN110642494A (en) * | 2019-09-30 | 2020-01-03 | 齐鲁工业大学 | Application of biomass ash as framework construction body in sludge dewatering and method for improving dewatering performance of papermaking excess sludge |
| CN110642494B (en) * | 2019-09-30 | 2022-06-24 | 齐鲁工业大学 | Application of biomass ash as framework construction body in sludge dewatering and method for improving dewatering performance of papermaking excess sludge |
| CN113149694A (en) * | 2021-06-09 | 2021-07-23 | 广东绿友环保科技有限公司 | Method for preparing high-strength ceramic tile from activated sludge |
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Application publication date: 20150923 |