CN103553293B - Deep dehydration method for solidifying fresh sludge through landfill stabilized sludge incineration residue - Google Patents
Deep dehydration method for solidifying fresh sludge through landfill stabilized sludge incineration residue Download PDFInfo
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- CN103553293B CN103553293B CN201310548740.4A CN201310548740A CN103553293B CN 103553293 B CN103553293 B CN 103553293B CN 201310548740 A CN201310548740 A CN 201310548740A CN 103553293 B CN103553293 B CN 103553293B
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Abstract
The invention discloses a deep dehydration method for solidifying fresh sludge through landfill stabilized sludge incineration residue. The method comprises two steps of chemical conditioning and modifying: adding water into fresh sludge to be dehydrated into sludge with moisture content of 80%-85%, conditioning into sludge with moisture content of 90%-93%, adding landfill stabilized sludge incineration residue 10%-30% the weight of the sludge, mixing uniformly; mechanical squeezing and deep dehydrating: pumping the conditioned sludge into a plate-and-frame filter press, deep dehydrating for 1 hour under the pressure of 1MPa. The method has the advantages that due to the utilization of the landfill stabilized sludge incineration residue, the capillary water absorption time of the sludge can be obviously shortened, and the dehydration performance of the sludge can be sharply improved; after filter pressing and dehydrating, the moisture content of the sludge is reduced to be less than 60%; the waste is used for processing waste, the dehydration performance of fresh sludge can be greatly improved, and the landfill stabilized sludge is excavated and recycled.
Description
Technical field
The invention belongs to specific resistance to filtration and resource technology field, relate to a kind of deep dehydration method utilizing Landfill Stabilization Rate sludge incineration residue to solidify fresh sludge.
Background technology
At present, the main method of China's specific resistance to filtration has compost, sanitary landfill, burning and Land_use change etc.Wherein, mud sanitary landfill, because having the features such as construction period short, reduced investment, convenient management, operation be simple, becomes a kind of method that China's sludge disposal the most generally adopts.But, along with the continuous increase of wastewater treatment in China factory sewage load, sludge yield constantly increases, make city landfill land used growing tension, for ensureing Sludge landfill Sustainable development, then land used shared by landfill mud inevitably needs to soar, as follow-up landfill land used or other planned land uses, therefore, carry out excavating the inevitable choice utilizing and will become following specific resistance to filtration to the mud of landfill.
On the other hand, the water ratio of sludge from wastewater treatment plant is high, after simple concentrated centrifugal dehydration treatment, water ratio is still up to 80%-85%, and mud is carried out to the process disposal such as further landfill, burning or Land_use change, all be strict with water ratio and drop to 60% and following, therefore need to carry out further deep dehydration process to mud.At present, the method that deeply dehydrating sludge generally adopts improves dewatering performance of sludge by adding dewatering agent, then reaches the object of deep dehydration through maintenance or mechanical effect.But, existing inorganic or organic dewatering agent, all more or less there is the large or high in cost of production problem of consumption.Therefore, the sludge dehydrating agent finding Cheap highly effective is a great problem of deeply dehydrating sludge.
Given this, patent of the present invention considers that landfill mud is after several years landfill stabilization, organism natural degradation, wherein then relatively stable at the inorganic dehydration agents of sludge dewatering stage interpolation, therefore can be used as the re-using of fresh sludge amendment.And, after being carried out burning disposal, inorganic dehydration agents wherein can be activated, make its dehydrating and curing effect better.Therefore, Landfill Stabilization Rate sludge incineration residue is reused for the solidification conditioning of fresh sludge by patent of the present invention, the treatment of wastes with processes of wastes against one another, while raising fresh sludge dewatering, realizes the recycling of excavation Landfill Stabilization Rate mud, kills two birds with one stone.
In Patents research, do not retrieve Patents at present and exploitation utilization is carried out to landfill stabilization mud study, only have a few patents, disclose the research utilizing solidification sludge incineration residue to improve dewatering performance of sludge.
Leather-making mud bottom ash is utilized to improve leather-making mud dewatering as disclosed one in Chinese document patent " a kind of method adding leather-making mud bottom ash raising dewatering performance of sludge " (publication number CN102923928A), and then add cationic polyacrylamide flocculant agent and nurse one's health further, the method finally adopting vacuum filtration to realize mud effectively to dewater.The method obviously can reduce the consumption of flocculation agent, and treatment effect is good, but research is only limitted to the leather-making mud of the non-predrainage of water ratio about 98%, and range of application is little.
Disclose in China document patent " a kind of sludge solidifying agent for the treatment of sludge from wastewater treatment plant and method for sludge treatment thereof " (publication number CN102267796A) a kind of by mass percent be the sludge incineration bottom ash of 40%-60%, the dewatering agent that combines of the magnesium chloride of mass percent to be the lime of 20%-40% and mass percent be 10%-20%, wherein, lime is unslaked lime, sludge incineration bottom ash is municipal sewage sludge anhydration and incineration bottom ash, and magnesium chloride is technical grade Magnesium Chloride Anhydrous.The process treatment process of this patented invention in sludge agitation device, adds water ratio 95%-97% sewage plant sludge and described water ratio 95%-97% sewage plant sludge weight in wet base mass percent is the sludge solidifying agent described in 5%-10%, then mix and blend is carried out, churning time should be no less than 10 minutes, after stirring terminates, shaping in a mold, under room temperature, after maintenance 1-7 days, carry out landfill after the demoulding or as landfill yard casingmaterial.The sludge incineration bottom ash related to is the residue after the dehydration of primary sludge drying.
In sum, the excavation that the present invention combines landfill mud utilizes demand and a sludge from wastewater treatment plant deep dehydration process difficult problem, from the angle of the treatment of wastes with processes of wastes against one another, utilize Landfill Stabilization Rate mud inorganic dehydration agents content high, and after burning disposal, character activates, the characteristics such as short texture, use it for solidification fresh sludge, and in conjunction with plate-and-frame filter press press dewatering to reach the object of deeply dehydrating sludge, realize exploitation and the recycling of landfill mud, circulation utilizes soil simultaneously.
Summary of the invention
Object of the present invention, exactly for the exploitation of existing landfill mud utilize a difficult problem and existing sludge dehydrating agent cost high, the difficult problems such as cost performance is low, deep dehydration difficult treatment, utilize in landfill stabilization mud residual inorganic dehydration agents content high, and after burning disposal, character activates, the features such as short texture, provides a kind of deep dehydration method utilizing Landfill Stabilization Rate sludge incineration residue to solidify fresh sludge.
The object of the present invention is achieved like this:
A kind of deep dehydration method utilizing Landfill Stabilization Rate sludge incineration residue to solidify fresh sludge of the present invention, comprises the following steps:
Chemical conditioning modification procedure: the fresh sludge being 80%-85% by predrainage to water ratio adds water and nurses one's health to water ratio is 90%-93%, is uniformly mixed after adding Landfill Stabilization Rate sludge incineration residue; Described Landfill Stabilization Rate sludge incineration residue and water ratio are the weight ratio of the mud of 90%-93% is 10-30: 100;
Mechanical expression deep dehydration step: pump in plate-and-frame filter press by the mud after chemical conditioning modification, under the pressure of 1MPa, deep dehydration 1h, makes the water ratio of mud lower than 60%.
Above-mentioned a kind of deep dehydration method utilizing Landfill Stabilization Rate sludge incineration residue to solidify fresh sludge, wherein, in chemical conditioning modification procedure, described Landfill Stabilization Rate sludge incineration residue is after the cured modified processed of inorganic dehydration agents, stabilization mud again after sanitary landfill 2-4, the residue burn 1h at 900 DEG C after.
Above-mentioned a kind of deep dehydration method utilizing Landfill Stabilization Rate sludge incineration residue to solidify fresh sludge, wherein, the cured modified processed of described inorganic dehydration agents comprises the following steps:
Be in the mud of 80%-85% to predrainage to water ratio, add inorganic dehydration agents, mix rear deep dehydration, make the water ratio of mud be 55%-60%; Described inorganic dehydration agents and water ratio are the weight ratio of the mud of 80%-85% is 3-10: 100.
Above-mentioned a kind of deep dehydration method utilizing Landfill Stabilization Rate sludge incineration residue to solidify fresh sludge, the mixture that wherein, described inorganic dehydration agents is lime, magnesium oxide and cement are prepared from by the weight ratio of 1:1:1.
The present invention compared with prior art has the following advantages:
(1) Landfill Stabilization Rate sludge incineration residue is utilized obviously can to reduce the CST(capillary water absorbing time of mud, hereinafter referred to as CST), significantly improve dewatering performance of sludge; After filter-press dehydration, moisture percentage in sewage sludge can drop to less than 60%, can meet subsequent disposal handle demand;
(2) be the treatment of wastes with processes of wastes against one another, can while increasing substantially fresh sludge dewatering, realize excavation and the recycling of landfill stabilization mud, circulation utilizes soil.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
In the present embodiment, handled fresh sludge is the product that Shanghai sludge of sewage treatment plant obtains after concentrated, centrifugal, and water ratio is 82.7%.
Residue after the mud that the Landfill Stabilization Rate sludge incineration residue used was Shanghai landfill yard sanitary landfill after 3 years burns 1h at 900 DEG C; this mud is before sanitary landfill; through following process: be in the mud of 83.6% to predrainage to water ratio; add the inorganic dehydration agents of 4% of mud weight; mix rear deep dehydration, make the water ratio of mud be 59.7%; Wherein, inorganic dehydration agents be lime, the mixture that is prepared from by the weight ratio of 1:1:1 of magnesium oxide, cement.
Concrete steps are as follows:
1) by water ratio be 82.7% fresh sludge add water conditioning to water ratio about 90%, add Landfill Stabilization Rate sludge incineration residue by 15% of mud weight, be uniformly mixed;
2) mud after conditioning is pumped in plate-and-frame filter press, under the pressure of 1MPa, deep dehydration 1h.
When fresh sludge adds water to about 90%, CST is 5860.3s, after the Landfill Stabilization Rate sludge incineration residue of adding 15%, mud CST drops to 494.8s, and dewatering significantly improves, after press filtration deep dehydration, moisture percentage in sewage sludge is down to 59.7%, can meet follow-up specific resistance to filtration demand.
Embodiment 2
With embodiment 1, just change the adding proportion of Landfill Stabilization Rate mud into 25%, the CST of the mixing sludge obtained reduces to 440.5s, and after press filtration, water ratio is down to 56.2%.As known from compared to Example 1, the dewatering of mud is improved to some extent with the increase of Landfill Stabilization Rate sludge incineration residue adding proportion, but increase rate is not obvious.
Embodiment 3
With embodiment 1, just mud of getting is Shanghai City sludge of sewage treatment plant, and water ratio is 84.3%, the residue after the mud that the Landfill Stabilization Rate sludge incineration residue used was Shanghai landfill yard landfill after 2 years burns 1h at 900 DEG C.The adding proportion of Landfill Stabilization Rate sludge incineration residue is 20%.
When fresh sludge adds water to about 90%, CST is 4231.3s, after the Landfill Stabilization Rate sludge incineration residue of adding 20%, mud CST drops to 356.7s, and dewatering significantly improves, after press filtration deep dehydration, moisture percentage in sewage sludge is down to 54.5%, can meet follow-up specific resistance to filtration demand.
Embodiment 4
With embodiment 1, just mud of getting is Shanghai City sludge of sewage treatment plant, and water ratio is 80.5%, the residue after the mud that the Landfill Stabilization Rate sludge incineration residue used was Shanghai landfill yard landfill after 4 years burns 1h at 900 DEG C.The adding proportion of Landfill Stabilization Rate sludge incineration residue is 10%.
When fresh sludge adds water to about 90%, CST is 2168.6s, after the Landfill Stabilization Rate sludge incineration residue of adding 10%, mud CST drops to 214.2s, and dewatering significantly improves, after press filtration deep dehydration, moisture percentage in sewage sludge is down to 50.9%, can meet follow-up specific resistance to filtration demand.
Above embodiment is used for illustrative purposes only, but not limitation of the present invention, person skilled in the relevant technique, without departing from the spirit and scope of the present invention, various conversion or modification can also be made, therefore all equivalent technical schemes also should belong to category of the present invention, should be limited by each claim.
Claims (1)
1. utilize Landfill Stabilization Rate sludge incineration residue to solidify a deep dehydration method for fresh sludge, it is characterized in that, comprise the following steps:
Chemical conditioning modification procedure: the fresh sludge being 80%-85% by predrainage to water ratio adds water and nurses one's health to water ratio is 90%-93%, is uniformly mixed after adding Landfill Stabilization Rate sludge incineration residue; Described Landfill Stabilization Rate sludge incineration residue and water ratio are the weight ratio of the mud of 90%-93% is 10-30: 100;
Mechanical expression deep dehydration step: the mud after chemical conditioning modification is pumped in plate-and-frame filter press, under the pressure of 1MPa, deep dehydration 1h, makes the water ratio of mud lower than 60%;
In chemical conditioning modification procedure, described Landfill Stabilization Rate sludge incineration residue is after the cured modified processed of inorganic dehydration agents, then the stabilization mud after sanitary landfill 2-4, the residue burn 1h at 900 DEG C after;
The cured modified processed of described inorganic dehydration agents comprises the following steps: be in the mud of 80%-85% to predrainage to water ratio, adds inorganic dehydration agents, mixes rear deep dehydration, make the water ratio of mud be 55%-60%; Described inorganic dehydration agents and water ratio are the weight ratio of the mud of 80%-85% is 3-10: 100;
The mixture that described inorganic dehydration agents is lime, magnesium oxide and cement are prepared from by the weight ratio of 1:1:1.
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| CN104761111B (en) * | 2015-04-14 | 2016-06-08 | 湖南大学 | A kind of method of powdered rice hulls conditioning sludge incineration slag preparation and conditioning municipal sludge thereof |
| CN107445444A (en) * | 2017-09-08 | 2017-12-08 | 燕京啤酒(桂林漓泉)股份有限公司 | The method of beer producers sewage disposal excess sludge deep dehydration |
| CN108658430B (en) * | 2018-05-18 | 2020-08-25 | 佛山市金凯地过滤设备有限公司 | Deep dehydration method for sludge |
| CN112239312A (en) * | 2020-09-23 | 2021-01-19 | 杭州国泰环保科技股份有限公司 | Method for landfill of sludge |
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| EP0587045A2 (en) * | 1992-09-11 | 1994-03-16 | BASF Aktiengesellschaft | Method for the utilization of waste plastics |
| CA2614763A1 (en) * | 2007-04-17 | 2008-10-17 | Mengjun Li | Method for dewatering of bctmp/ctmp sludge |
| CN102267796A (en) * | 2011-07-08 | 2011-12-07 | 上海老港废弃物处置有限公司 | Sludge curing agent for treating sludge in urban sewage treatment plant and sludge treatment method |
| CN103011548A (en) * | 2012-12-27 | 2013-04-03 | 哈尔滨工业大学水资源国家工程研究中心有限公司 | Conditioner for combinedly conditioning sludge and method for dehydrating sludge through utilizing conditioner |
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Patent Citations (4)
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| EP0587045A2 (en) * | 1992-09-11 | 1994-03-16 | BASF Aktiengesellschaft | Method for the utilization of waste plastics |
| CA2614763A1 (en) * | 2007-04-17 | 2008-10-17 | Mengjun Li | Method for dewatering of bctmp/ctmp sludge |
| CN102267796A (en) * | 2011-07-08 | 2011-12-07 | 上海老港废弃物处置有限公司 | Sludge curing agent for treating sludge in urban sewage treatment plant and sludge treatment method |
| CN103011548A (en) * | 2012-12-27 | 2013-04-03 | 哈尔滨工业大学水资源国家工程研究中心有限公司 | Conditioner for combinedly conditioning sludge and method for dehydrating sludge through utilizing conditioner |
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Inventor after: Wang Shaobo Inventor after: Jia Tinggang Inventor after: Jiu Xingfu Inventor after: Wu Fangliang Inventor after: Lin Meijing Inventor after: Mi Qiong Inventor after: Zhao Youcai Inventor after: Chang Yanjun Inventor before: Wang Shaobo Inventor before: Jia Tinggang Inventor before: Jiu Xingfu Inventor before: Wu Fangliang Inventor before: Lin Meijing Inventor before: Mi Qiong Inventor before: Zhao Youcai |
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Free format text: CORRECT: INVENTOR; FROM: WANG SHAOBO JIA TINGGANG MIAO XINGFU WU FANGLIANG LIN MEIJING MI QIONG ZHAO YOUCAI TO: WANG SHAOBO JIA TINGGANG MIAO XINGFU WU FANGLIANG LIN MEIJING MI QIONG ZHAO YOUCAI CHANG YANJUN |