CN105668987A - Sludge conditioner and in situ dewatering treatment method by use of sludge conditioner - Google Patents
Sludge conditioner and in situ dewatering treatment method by use of sludge conditioner Download PDFInfo
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- CN105668987A CN105668987A CN201610021582.0A CN201610021582A CN105668987A CN 105668987 A CN105668987 A CN 105668987A CN 201610021582 A CN201610021582 A CN 201610021582A CN 105668987 A CN105668987 A CN 105668987A
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- sludge
- mud
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- sludge conditioner
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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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- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Treatment Of Sludge (AREA)
Abstract
The invention relates to a sludge conditioner and an in situ dewatering treatment method by the use of the sludge conditioner. In urban sewage treatment, lots of sludge will be generated, and sludge puddle will be formed if the sludge is transported outward and stacked. In situ treatment and utilization of the sludge is the best choice. The invention discloses a sludge conditioner and an in situ dewatering treatment method by the use of the sludge conditioner. Composition of the sludge conditioner comprises industrial sodium ferrate and citric acid. Content of the sludge conditioner is based on volume of sludge. Dosage of the conditioner is 5-10 g/L. Ratio of sodium ferrate to citric acid is 9:1. The sludge conditioner is low-cost, convenient and safe. The drug used is nontoxic. After application, the problem of secondary pollution will not be generated. The in situ dewatering method comprises the following steps: making the sludge conditioner into a solution and injecting the solution into sludge, and then dewatering the sludge by a booster-type vacuum preloading method. By the in situ dewatering method with the sludge conditioner, reduction of sludge reaches 50% and above, and the reduction effect is obvious. The method is beneficial to follow-up ecological management.
Description
Technical field
The invention belongs to environmental protection technical field, relate to the excess sludge that municipal sewage plant's non-standardization is disposed, especially to a kind of sludge conditioner and the dehydrated in situ processing method using sludge conditioner.
Background technology
Along with the quickening of Urbanization in China, municipal sludge produces in a large number, and environmental pollution increasingly sharpens. Statistics according to China's house and urban construction department of town and country construction portion, national sewage treatment plant in 2008 totally 1519, processes wastewater flow rate 6699.8 ten thousand m3/ d; By 2014, sewage treatment plant reached 3622, and wastewater treatment capacity reaches 1.53 hundred million m3/ d. Will certainly producing substantial amounts of excess sludge while processing sewage, yield generally accounts for the 0.3%～0.5% of sewage load, if not carrying out dealing carefully with, disposing, it will environment and human health are threatened.
In developed country, the operating cost of a perfect specific resistance to filtration system often accounts for the 50～70% of whole Sewage Plant total operating cost, and is used for the 24～45% of the investment Jin Zhan sewage treatment plant gross investment of specific resistance to filtration in China. What have sludge stabilization treatment facility in the sewage treatment project of the whole nation is less than 1/4, process technique and corollary equipment comparatively perfect be less than 1/1, restriction due to the factor such as fund, technology, a large amount of mud are unprocessed to be directly discharged in environment, and then produce need in a large number further solidification and stabilization process mud pool, subsoil water and surface water, through the erosion of rainwater and seepage effect, are very easily caused secondary pollution by the excess sludge that non-standard is stacked, directly harm human body health. Domestic mud pool not yet causing enough concerns, the excess sludge that non-standard is stacked processes the researches disposed and has been reported that.
Chinese patent literature " a kind of mud ecological treatment method " (application publication number CN104071960A, October 01 2014 publication date), disclose a kind of landfill yard storage conditioner for sludge dehydration, formula is ferric chloride and citric acid, content is the 0.1% ~ 1% of sludge quality percentage ratio, and the ratio of ferric chloride and citric acid is 10:1.In this patent, the conditioner composition ferric chloride of design is inorganic flocculating agent, rely primarily on the charge characteristic changing mud colloid surface to overcome electrostatic repulsion and hydration, make mud granule flocculate, but inorganic flocculating agent does not provide advantage for absorption water and internal and with water release and removal. Citric acid produces chelation with the heavy metal in mud, make the leaching ability of heavy metal in mud, but the leaching ability of heavy metal rate in mud is subject to the impact of the pH of mud, simultaneously the content that dispatches from the factory of the heavy metal in municipal sludge is very low and reached discharge standard, is therefore not suitable for adding citric acid as the method removing Heavy Metals in Sludge.
Chinese patent literature " a kind of Sludge Dewatering Flocculant and dewatering thereof " (application publication number CN104016566A, 2014 publication dates JIUYUE 03 day), disclosing a kind of Sludge Dewatering Flocculant and deep dehydration method water method thereof, described Sludge Dewatering Flocculant is made up of each component of following percentage by weight: aluminium oxide 5 ~ 27%, chitin 4 ~ 18%, silica 13 ~ 25%, acrylamide 10 ~ 24%, sodium chloride 6 ~ 18%, concentrated sulphuric acid 2 ~ 13%. This patent is as solid-liquid mixing conditioner, it is impossible to injected by sludge conditioner in mud pool, is not suitable for the application in the mud pool processed that a large amount of mud are formed.
For the various factors affecting dewatering performance of sludge, the characteristics such as the technological parameter that sludge dewatering decrement treatment shortage can directly be used for reference, on the basis of mud Basic Characteristics result, exploitation targetedly, screening sludge conditioner are a job with practical significance.
Summary of the invention
For the problem existing for the dehydration technique of existing mud pool, it is an object of the invention to provide one and utilize Na2Fe04 (Na2FeO4) and citric acid (C6H8O7) mixing the method that mud is carried out the pre-press-dehydrating of supercharged vacuum by conditioner, the method has the investment advantages such as operating cost is relatively low, energy-output ratio is less, technological process is simple.
To achieve these goals, technical scheme is as follows:
A kind of sludge conditioner that the present invention proposes, the component of described sludge conditioner is Na2Fe04 and citric acid, described sludge conditioning agent content is by sludge volume, and sludge conditioner amount of reagent is 5 ~ 10g/L, wherein: the mass ratio of Na2Fe04 and citric acid is 9:1. Described Na2Fe04 is a kind of sexavalence iron salt, and chemical formula is Na2FeO4, there is very strong oxidisability, energy soluble in water discharges substantial amounts of elemental oxygen. Citric acid is a kind of organic acid, and chemical formula is C6H8O7, there is the effect regulating pH value of solution, strengthen the performance of Na2Fe04 oxidized sludge, two kinds of compositions all belong to benign thing, nontoxic.
Application in the sludge conditioner processed in position that the present invention proposes, concretely comprise the following steps: be the aqueous solution of 30 ~ 50% by sludge conditioner compound concentration, namely 1L water add the mixed-powder of 300 ~ 500g, it is injected in mud by grouting pump, then mud utilize supercharged vacuum preloading method carry out dehydration, wherein: by sludge volume, sludge conditioner amount of reagent is 5 ~ 10g/L.
The sludge conditioner that the present invention proposes discharges the application of the mud pool dehydration that mud is formed in municipal sewage plant, and in described mud pool dehydration, the moisture content of mud is 85 ~ 95%, and pH is 7 ~ 9; Sludge conditioner is configured to the aqueous solution that concentration is 300 ~ 500g/L, namely 1L water add the mixed-powder of 300 ~ 500g, it is injected in mud by grouting pump, then mud utilize supercharged vacuum preloading method carry out dehydration, wherein: by sludge volume, sludge conditioner amount of reagent is 5 ~ 10g/L.
In the present invention, described supercharged vacuum preloading method is realized by supercharged vacuum prepressing device, and described supercharged vacuum prepressing device includes the silting blocking plastic draining board being uniformly distributed in mud that vacuum tube is connected and the pressure inlet being arranged at square silting blocking plastic draining board centre with vacuum tube.
In the present invention, the degree of depth adjustment according to mud of the grouting pressure of described grouting pump, grouting pressure is 1 ~ 4kg.
In the present invention, the installation of supercharged vacuum prepressing device: leveling place, lay one layer of looped fabric, plug vertical silting blocking plastic draining board, draining board is that square is arranged, spacing is 0.4 ~ 0.8m, is connected with sealing arm by each vertical drainage plate by seal nipple, being connected with vertical drainage supervisor by tee joint joint by each sealing arm, vacuum is transferred directly to inside draining board by seal nipple and drain pipe. Placing a pressure inlet at the center of square, increase the pressure differential with foundation soil in draining board film, Free water produces directed flow under pressure, and acceleration is consolidated by mud. Lay again and seal ditch, lay PVC vacuum diaphragm;
The present invention compared with the existing technology, has the following advantages and beneficial effect:
For the purpose of the method for the present invention is based on sludge dewatering and consolidates, after the opsonic action of Na2Fe04 and citric acid, the moisture in mud is removed by recycling supercharged vacuum preloading method; This technological operation runs simple, and energy-output ratio is low, not only achieves mud pool sludge in-situ and processes, also can effectively control the risk of environmental pollution that mud pool is brought, have important theory and actual application value.
Present invention process is simple, with low cost, water content in mud can be significantly reduced, not only meet the related request that mud pool is administered within a short period of time, it is to avoid by the mud shifting processing increase to Financial cost in mud pool, there is higher economy and society environmental benefit.
Accompanying drawing explanation
Fig. 1 is shown supercharged vacuum precompressed site plan.
Fig. 2 be in mud shown in embodiment 1 moisture content with reactions change curve chart.
Fig. 3 be in mud shown in embodiment 2 moisture content with reactions change curve chart.
Number in the figure: 01 seal nipple, 02 vertical drainage plate, 03 seals arm, 04 connection joint, 05 drain header, 07 vacuum pump, 06 pressure inlet.
Detailed description of the invention
Below in conjunction with accompanying drawing illustrated embodiment, the present invention is further elaborated.
Embodiment 1
1) two kinds of preparation of reagents of Na2Fe04 and citric acid being become solution, wherein Na2Fe04 is 9:1 with the ratio of citric acid, the aqueous solution that concentration is 50% of preparation solution, namely adds the mixed-powder of 500g in 1L water, is sufficiently mixed; Described sludge conditioning agent content is by sludge volume, and conditioner amount of reagent is 5 ~ 10g/L.
2) the conditioner aqueous solution of preparation is injected in mud by grouting pump. The degree of depth adjustment according to mud of the grouting pressure of described grouting pump, grouting pressure is 1 ~ 4kg;
3) installation of supercharged vacuum system: leveling place, lay one layer of looped fabric, plug vertical silting blocking plastic draining board, draining board is that square is arranged, spacing is 0.4m, is connected with sealing arm 03 by each vertical drainage plate 02 by seal nipple 01, is connected with drain header 05 by tee joint or four connection joints 04 by each sealing arm, vacuum is delivered to seal nipple by vacuum pump 07 and drain pipe is transferred directly to inside draining board.Placing a pressure inlet 06 at the center of square, increase the pressure differential with foundation soil in draining board film, Free water produces directed flow under pressure, and acceleration is consolidated by mud, and pressure inlet connects booster pump 08. Lay again and seal ditch, lay PVC vacuum diaphragm;
4), after said system installation and debugging, dehydration experiment is proceeded by. Concrete experimental procedure is as follows: first forvacuum, to 0.03MPa, checks whether vacuum diaphragm leaks gas; Vacuum is maintained at about 0.03MPa, and continuous evacuation is until water yield significantly reduces; Improve vacuum to 0.06MPa, be evacuated to water yield continuously and significantly reduce; Improve vacuum to 0.08MPa, be evacuated to water yield continuously and significantly reduce; Supercharging adopts clearance-type supercharging, keeps vacuum to start progressively to add at 0.08MPa and be just depressed into 0.02MPa, progressively adds and be just depressed into 0.00 ~ 0.02MPa after using discharge reduction, keeps vacuum at 0.08MPa, is evacuated to continuously without water outlet.
Embodiment 2
(1) taking Flos persicae mountain refuse landfill mud pool, certain mass Wuxi mud, moisture percentage in sewage sludge is about 89.29%, and sludge pH is 8.27;
(2) conditioner that ratio is 9:1 of Na2Fe04 Yu citric acid is configured to the aqueous solution that concentration is 50% of solution, is sufficiently mixed; Being injected in mud by the solution prepared, conditioner examination injection rate is 7g/L;
(3) installation of supercharged vacuum system: leveling place, lay one layer of looped fabric, plug vertical silting blocking plastic draining board, draining board is that square is arranged, spacing is 0.4m, is connected with sealing arm by each vertical drainage plate by seal nipple, is connected with vertical drainage supervisor by tee joint joint by each sealing arm, vacuum is transferred directly to inside draining board by seal nipple and drain pipe, places a pressure inlet at the center of square. Lay again and seal ditch, lay PVC vacuum diaphragm. After system installation and debugging, proceed by energising construction.
As in figure 2 it is shown, Fig. 2 be in mud shown in embodiment 2 moisture content with reactions change curve chart. Mud is at conditioner under the effect of supercharged vacuum preloading method, and moisture content is dropped to 76.48% by 89.29%, and mud decrement reaches 54.46%.
Embodiment 3
(1) taking ditch refuse landfill mud pool, certain mass Xi Anjiang village mud, moisture percentage in sewage sludge is about 90.57%, and sludge pH is 8.69;
(2) conditioner that ratio is 9:1 of Na2Fe04 Yu citric acid is configured to the aqueous solution that concentration is 50% of solution, is sufficiently mixed; Being injected in mud by the solution prepared, conditioner examination injection rate is 8g/L;
(3) installation of supercharged vacuum system: leveling place, lay one layer of looped fabric, plug vertical silting blocking plastic draining board, draining board is that square is arranged, spacing is 0.4m, is connected with sealing arm by each vertical drainage plate by seal nipple, is connected with vertical drainage supervisor by tee joint joint by each sealing arm, vacuum is transferred directly to inside draining board by seal nipple and drain pipe, places a pressure inlet at the center of square. Lay again and seal ditch, lay PVC vacuum diaphragm. After system installation and debugging, proceed by energising construction.
As it is shown on figure 3, Fig. 3 be in mud shown in embodiment 3 moisture content with reactions change curve chart. Mud is at conditioner under the effect of supercharged vacuum preloading method, and moisture content is dropped to 77.31% by 90.57%, and mud decrement reaches 58.4%.
Claims (5)
1. a sludge conditioner, it is characterized in that: the component of described sludge conditioner is Na2Fe04 and citric acid, described sludge conditioning agent content is by sludge volume, and sludge conditioner amount of reagent is 5 ~ 10g/L, wherein: the mass ratio of Na2Fe04 and citric acid is 9:1.
2. the application in a sludge conditioner as claimed in claim 1 processed in position, it is characterized in that concretely comprising the following steps: be the aqueous solution of 300 ~ 500g/L by sludge conditioner compound concentration, it is injected in mud by grouting pump, then mud utilize supercharged vacuum preloading method carry out dehydration, wherein: by sludge volume, sludge conditioner amount of reagent is 5 ~ 10g/L.
3. a sludge conditioner as claimed in claim 1 discharges the application of the mud pool dehydration that mud is formed in municipal sewage plant, it is characterised in that in described mud pool dehydration, the moisture content of mud is 85 ~ 95%, and pH is 7 ~ 9; Sludge conditioner is configured to the aqueous solution that concentration is 300 ~ 500g/L, is injected in mud by grouting pump, then mud utilize supercharged vacuum preloading method carry out dehydration, wherein: by sludge volume, sludge conditioner amount of reagent is 5 ~ 10g/L.
4. the application according to Claims 2 or 3, it is characterized in that: described supercharged vacuum preloading method is realized by supercharged vacuum prepressing device, described supercharged vacuum prepressing device includes the silting blocking plastic draining board being uniformly distributed in mud that vacuum tube is connected and the pressure inlet being arranged at square silting blocking plastic draining board centre with vacuum tube.
5. the application according to Claims 2 or 3, it is characterised in that: the degree of depth adjustment according to mud of the grouting pressure of described grouting pump, grouting pressure is 1 ~ 4kg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610021582.0A CN105668987A (en) | 2016-01-14 | 2016-01-14 | Sludge conditioner and in situ dewatering treatment method by use of sludge conditioner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610021582.0A CN105668987A (en) | 2016-01-14 | 2016-01-14 | Sludge conditioner and in situ dewatering treatment method by use of sludge conditioner |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106734178A (en) * | 2017-03-07 | 2017-05-31 | 吉林大学 | Comprehensive restoration system and method for polluted site |
| CN110106860A (en) * | 2019-04-03 | 2019-08-09 | 中交四航工程研究院有限公司 | A method of taking into account heavy metal polluted soil ground restoration and discharging consolidation processing |
| CN113896387A (en) * | 2021-11-03 | 2022-01-07 | 南京工业职业技术大学 | Sludge purification and dehydration structure based on combination of thermal desorption technology and vacuum preloading technology and construction method thereof |
-
2016
- 2016-01-14 CN CN201610021582.0A patent/CN105668987A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106734178A (en) * | 2017-03-07 | 2017-05-31 | 吉林大学 | Comprehensive restoration system and method for polluted site |
| CN110106860A (en) * | 2019-04-03 | 2019-08-09 | 中交四航工程研究院有限公司 | A method of taking into account heavy metal polluted soil ground restoration and discharging consolidation processing |
| CN110106860B (en) * | 2019-04-03 | 2022-04-15 | 中交四航工程研究院有限公司 | Method for repairing heavy metal polluted soil foundation and treating drainage consolidation |
| CN113896387A (en) * | 2021-11-03 | 2022-01-07 | 南京工业职业技术大学 | Sludge purification and dehydration structure based on combination of thermal desorption technology and vacuum preloading technology and construction method thereof |
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Application publication date: 20160615 |