CN105236707A - Sewage treatment plant waste mud immobilization agent, and preparation method and application thereof - Google Patents
Sewage treatment plant waste mud immobilization agent, and preparation method and application thereof Download PDFInfo
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- CN105236707A CN105236707A CN201510643062.9A CN201510643062A CN105236707A CN 105236707 A CN105236707 A CN 105236707A CN 201510643062 A CN201510643062 A CN 201510643062A CN 105236707 A CN105236707 A CN 105236707A
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Abstract
The invention discloses a sewage treatment plant waste mud immobilization agent, and a preparation method and an application thereof. The method comprises the following steps: uniformly mixing heat treated calcium-rich clay with high-efficiency heavy metal immobilization ability with tap water plant tailing mud at a certain temperature in a certain pH value range according to a certain ratio, and disposing the obtained mixture under natural environment conditions for 8-10d to realize natural weathering air-drying; and mixing the air-dried mixture with sewage treatment plant waste sludge according to a certain ratio in order to adsorb substances harmful to environment in the sewage treatment plant sludge. The immobilization agent has a strong adsorption effect on heavy metal ions, nutritional salts and other substances, and is in favor of promoting immobilization of sewage plant sludge; and the tap water plant sludge is added to reduce the use amount of attapulgite and reduce the immobilization cost in order to realize waste control by waste. Sludge treated by the immobilization agent can be used for constructing and maintaining ecological wetland to realize circulating transition of the sludge in the nature, and has a very strong guiding effect on the development of a sewage plant sludge treatment technology.
Description
Technical field
The invention belongs to the Recycle of Sludge in Wastewater Treatment Plant field in environment protection, more particularly, is that application heat treated rich calcium clay material, waterworks tail mud are mixed with fixing agent, to the process for fixation of sludge of sewage treatment plant.
Background technology
Municipal sludge is as municipal sewage treatment by product, and it has unique character, and such as water ratio is high, and organic content is high, simultaneously also containing the hazardous and noxious substances such as a large amount of pathogenic agent and heavy metal.The character of sludge from wastewater treatment plant is complicated and very unstable, extremely easily degenerates, and gives out irritating smell, if directly stacked it, can become the existence place of the unwanted bacterias such as pathogenic micro-organism, cause secondary pollution to environment.Therefore, the process of municipal sludge is disposed and is become one of urgent problem in Development of Urbanization gradually.
At present, for sludge of sewage treatment plant process, mainly contain following four kinds of methods both at home and abroad, Ocean dumping, mud sanitary landfill, burning and Land_use change.Ocean dumping is the treatment process that people take sewage plant sludge recognizing dangers deficiency in early days, can cause and largely destroy, affect the normal existence of epibiota group, procreation to the marine eco-environment; Mud sanitary landfill treatment process is simple, cost is lower, can short-term response, in China, Application comparison is extensive.Shortcoming needs to take a large amount of landfill places and amount transport expense, there are certain requirements mud soil mechanics performance simultaneously, and need to carry out Anti-seeping technology to landfill place, prevents from polluting underground water; Burning disposal mode can reach the maximum minimizing (residue grey matter be about 1/10 of original volume) of mud, is treatment process the most thoroughly.The stable in properties of grey matter after sludge incineration, odorless, pathogen-free domestic is biological.Grey matter can resource utilization as soil improvement agent, make building materials etc.But burning disposal also has obvious shortcoming: it is disposable has high input; The cost of running maintenance is high; In grey matter after burning, heavy metal content may exceed standard, and not treated discharge can cause secondary pollution.
Land_use change is another mode of sludge treatment, is also that we are devoted to the sludge treatment mode of pursuit now.In mud, add fixing agent, ensure that the pollution substances such as heavy metal ion can not flow out, secondary pollution can not be caused to environment, be conducive to mud and change in the circulation of occurring in nature.Land_use change is the main development direction of the following sludge treatment of China.
Chinese patent application (authorizing publication number CN101428951A) discloses a kind of sewage plant sewage sludge curing/stabilizing circulation treatment, uses the mixture of cement, lime, flyash and clay mineral as curing additive; Chinese patent application (authorizing publication number CN101428950A) discloses a kind of sewage plant sewage sludge curing/stabilizing treatment material, uses the mixture of cement clay mineral, promoting agent, Sodium sulfate anhydrous.min(99) mixture as curing additive; The main weak point of aforesaid method is, 1), adopt cement as curing additive in immobilization process, sewage plant sludge is consolidated into block, can not social need-oriented be used for, can not to circulate conversion at occurring in nature; 2), adopt a large amount of cement solidification additive in immobilization process, solidification running cost is high, and econmics comparison is poor.3), the ultimate compression strength of immobilization product requires higher, the requirement that all will strictly reach of the order of addition of immobilization process material, time scale, material usage proportioning and immobilized reactant, test set, operating process is complicated, and variable is many, and immobilization output control difficulty is relatively large.
Summary of the invention
1, the technical problem to be solved in the present invention
For after the sludge of sewage treatment plant solidification existed in prior art nature can not conversion and cycle, immobilization running cost high, the problem of econmics comparison difference, the invention provides fixing agent and the Synthesis and applications thereof of a kind of sewage work waste sludge, adopt rich calcium clay, alum sludge is mixed with fixing agent, the immobilization of sludge of sewage treatment plant can be promoted, reduce the consumption of attapulgite clay, reduce immobilization cost, realize the object of the treatment of wastes with processes of wastes against one another.
The fixing agent that the rich calcium clay material of employing after Overheating Treatment, waterworks tail mud are mixed with by a certain percentage, under the condition that temperature, pH scope are certain, mix according to certain ratio with the sludge of sewage treatment plant after thermal treatment, absorption transforms the process of environmentally harmful material (heavy metal ion, nutritive salt etc.) in sludge of sewage treatment plant., on the one hand because the materials such as its heavy metal ion, nutritive salt have stronger adsorption, be conducive to the immobilization promoting sludge of sewage treatment plant; On the other hand, add alum sludge, the sludge of sewage treatment plant after immobilization is used for construction and the maintenance of ecological wetland, realizes mud and changes in the circulation of occurring in nature.
1, technical scheme
In order to solve the problems of the technologies described above, the technical scheme that the present invention proposes is:
A fixing agent for sewage work's waste sludge, is mixed by waterworks waste sludge and rich calcium clay material.
Described waterworks waste sludge, the content of its Fe is the content of 188g/kg ~ 252g/kg, Al is 94g/kg ~ 143g/kg;
Described rich calcium clay material is calcium based sepiolite and/or calcium base attapulgite clay mineral, and described calcium based sepiolite molecular composition is Mg
4si
6o
15(OH)
26H
2o, calcium base attapulgite clay mineral molecular composition Mg
5si
8o
20(OH)
2(OH
2)
44H
2o;
The calcareous component content of described rich calcium clay material is 15% ~ 25%, and described calcareous molecular composition is CaMg (CO
3)
2;
Described rich calcium clay material size is 0.15mm ~ 0.5mm;
A preparation method for the fixing agent of sewage work's waste sludge, its preparation process step is as follows:
(1) gather waterworks tail mud, through the high-pressure steam sterilizing pan process 10 ~ 20min of 100 DEG C ~ 200 DEG C of conditions, remove the bacterium and other some objectionable impuritiess that exist in mud, reduce its water ratio.
(2) described calcium base clay material is made into particulate state, size is that 0.15mm ~ 0.5mm is dried under 105 DEG C of conditions;
(3) the calcium base clay material processed through step (2) is heated 1h at the temperature of 800 DEG C;
(4) the waterworks tail mud that the calcium base clay material that will process through step (3) and step (1) processed according to dry weight than 10:100 ~ 20:100 Homogeneous phase mixing, regulate mixture pH between 7 ~ 8, solidification treatment 8 ~ 10d under natural environmental condition;
(5) material after step (4) solidification is made into particulate state, size is 0.25mm ~ 0.6mm, dries under 105 DEG C of conditions;
A kind of using method of sludge of sewage treatment plant fixing agent, it is used in the middle of the process of sludge of sewage treatment plant by being mixed and made into fixing agent by waterworks waste sludge and rich calcium clay material, under the condition that temperature, pH are certain, mix by a certain percentage with sludge of sewage treatment plant, the heavy metal ion in Adsorption sludge of sewage treatment plant and other objectionable impurities.
A using method for the fixing agent of sewage work's waste sludge, the steps include:
(1) gather sludge of sewage treatment plant, through the high-pressure steam sterilizing pan process 10 ~ 20min of 100 DEG C ~ 200 DEG C of conditions, remove the bacterium and other some objectionable impuritiess that exist in mud, reduce its water ratio;
(2) fixing agent of sewage work's waste sludge is mixed than 105:100 ~ 120:100 by dry weight with sludge of sewage treatment plant, regulate mixture pH to be neutral or weakly alkaline, in occurring in nature natural reaction for some time;
(3) harmful substance contents such as heavy metal in the sludge of sewage treatment plant after detection reaction;
(4) by process after sludge of sewage treatment plant be backfilling into other places, for ecological wetland construction and safeguard in the middle of.
The water ratio of Sewage Plant waste sludge is controlled 60% ~ 70% in described step (1);
In described step (2), fixing agent and the dry weight mixed of sludge of sewage treatment plant are than controlling as 105:100 ~ 120:100;
Mixture pH is controlled between 7 ~ 8, in weakly alkaline in described step (2);
3, beneficial effect
(1) fixing agent that the present invention adopts the rich calcium clay material after Overheating Treatment, waterworks tail mud is mixed with, to material (heavy metal ion, nutritive salt etc.) environmentally harmful in sewage plant sludge, there is very strong absorption transformation, be conducive to promoting mud recycling process;
(2) fixing agent that the present invention adopts the rich calcium clay material after Overheating Treatment, waterworks tail mud is mixed with, add in sludge of sewage treatment plant, mud after process can not be consolidated into entirety, may be used for construction and the maintenance of ecological wetland, realize mud and change in the circulation of occurring in nature;
(3) fixing agent that the present invention adopts the rich calcium clay material after Overheating Treatment, waterworks tail mud is mixed with, add waterworks tail mud, the consumption of rich calcium clay material can be reduced, reduce immobilization cost, reach the object of the treatment of wastes with processes of wastes against one another simultaneously;
(4) waterworks tail mud, Sewage Plant waste sludge are through the high-pressure steam sterilizing pan process of 100 DEG C ~ 200 DEG C of conditions, remove the bacterium and other some objectionable impuritiess that exist in mud, play the action effect reducing its water ratio simultaneously;
(5) the rich calcium clay material after thermal treatment, waterworks tail mud according to dry weight than 10:100 ~ 20:100 Homogeneous phase mixing prepare fixing agent, this fixing agent and sludge of sewage treatment plant the dry weight mixed than controlling as 105:100 ~ 120:100, best fixed effect can be obtained with least cost, be conducive to again the abundant absorption of fixing agent to objectionable impuritiess such as Heavy Metals in Sludge ions simultaneously;
(6) the present invention controls the water ratio of Sewage Plant waste sludge is 60% ~ 70%, is conducive to the Homogeneous phase mixing of fixing agent and mud, promotes the absorption process of the objectionable impurities of sewage plant sludge;
(7) the present invention controls the pH of the immobilization process of Sewage Plant waste sludge between 7 ~ 8, in weakly alkaline.Weakly alkaline is conducive to the existence of fixing agent flock suspended substance, to the absorption of the heavy metal ion in the mud of sewage work and nutritive salt.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.
Embodiment 1:
A preparation method for the fixing agent of sewage work's waste sludge,
Choose smelting mountain, Liuhe District, Nanjing four and close waterworks waste sludge, the content of its Fe is the content of 188g/kg, Al is 94g/kg;
Choose the original state calcium based sepiolite clay material in Yi County, Hebei, its molecular composition is Mg
4si
6o
15(OH)
26H
2o;
The calcareous component content of calcium based sepiolite clay material chosen is 15%, and described calcareous molecular composition is CaMg (CO
3)
2;
The calcium based sepiolite clay material size chosen is 0.15mm;
Its concrete preparation process is as follows:
(1) gather smelting mountain, Liuhe District, Nanjing four and close waterworks tail mud, through the high-pressure steam sterilizing pan process 10min of 100 DEG C of conditions, remove the bacterium and other some objectionable impuritiess that exist in mud, reduce its water ratio.
(2) described original state calcium based sepiolite clay machinery is made into particulate state, size is 0.15mm, dries under 105 DEG C of conditions;
(3) the calcium based sepiolite clay processed through step (2) is heated 1h at the temperature of 800 DEG C;
(4) the A waterworks tail mud that the calcium based sepiolite clay that will process through step (3) and step (1) processed according to dry weight than 10:100 Homogeneous phase mixing, regulate mixture pH 7, solidification treatment 8d under natural environmental condition;
(5) material after step (4) solidification is made into particulate state, size is 0.25mm, dries under 105 DEG C of conditions;
The application of above-mentioned fixing agent, the steps include:
(1) gather X sludge of sewage treatment plant, through the high-pressure steam sterilizing pan process 10min of 100 DEG C of conditions, remove the bacterium and other some objectionable impuritiess that exist in mud, reduce its water ratio;
(2) fixing agent that said process is obtained is mixed than 105:100 by dry weight with sludge of sewage treatment plant, regulate mixture pH to be neutral or weakly alkaline, at occurring in nature natural reaction 8d;
(3) harmful substance contents such as heavy metal in the sludge of sewage treatment plant after detection reaction, its clearance reaches 93%;
(4) by process after X sludge of sewage treatment plant be backfilling into other places, for ecological wetland construction and safeguard in the middle of.
The water ratio of Sewage Plant waste sludge is controlled 60% in described step (1);
In described step (2), fixing agent and the dry weight mixed of sludge of sewage treatment plant are than controlling as 105:100;
Controlling mixture pH in described step (2) is 7, in neutral;
Embodiment 2:
A preparation method for the fixing agent of sewage work's waste sludge,
Choose Tianmu Lake waterworks, Tianmu Lake market town, Liyang City of Jiangsu Province waste sludge, the content of its Fe is the content of 215g/kg, Al is 110g/kg;
Choose the original state calcium base attapulgite clay material of Xuyi Jiangsu, its molecular composition is Mg
5si
8o
20(OH)
2(OH
2)
44H
2o;
The calcareous component content of calcium base attapulgite clay material chosen is 20%, and described calcareous molecular composition is CaMg (CO
3)
2;
The calcium base attapulgite clay material particle size size chosen is 0.3mm;
Its concrete preparation process is as follows:
(1) gather Liyang, changzhou Running-water Company tail mud, through the high-pressure steam sterilizing pan process 15min of 150 DEG C of conditions, remove the bacterium and other some objectionable impuritiess that exist in mud, reduce its water ratio;
(2) described calcium base attapulgite clay material mechanical is made into particulate state, size is 0.3mm, dries under 105 DEG C of conditions;
(3) the calcium base attapulgite clay material processed through step (2) is heated 1h at the temperature of 800 DEG C;
(4) the waterworks tail mud that the calcium base attapulgite clay material that will process through step (3) and step (1) processed according to dry weight than 15:100 Homogeneous phase mixing, regulate mixture pH 7.5, solidification treatment 9d under natural environmental condition;
(5) material after step (4) solidification is made into particulate state, size is 0.4mm, dries under 105 DEG C of conditions;
The using method of above-mentioned fixing agent, the steps include:
(1) gather Y sludge of sewage treatment plant, through the high-pressure steam sterilizing pan process 15min of 150 DEG C of conditions, remove the bacterium and other some objectionable impuritiess that exist in mud, reduce its water ratio;
(2) fixing agent that said process is obtained is mixed than 113:100 by dry weight with sludge of sewage treatment plant, regulate mixture pH to be neutral or weakly alkaline, at occurring in nature natural reaction 9d;
(3) harmful substance contents such as heavy metal in the sludge of sewage treatment plant after detection reaction, its clearance reaches 90%;
(4) by process after Y sludge of sewage treatment plant be backfilling into other places, for ecological wetland construction and safeguard in the middle of.
The water ratio of Sewage Plant waste sludge is controlled 65% in described step (1);
In described step (2), fixing agent and the dry weight mixed of sludge of sewage treatment plant are than controlling as 113:100;
Controlling mixture pH in described step (2) is 7.5, in weakly alkaline;
Embodiment 3:
A preparation method for the fixing agent of sewage work's waste sludge,
Choose Pan Tang waterworks, Xuzhou city waste sludge, the content of its Fe is the content of 252g/kg, Al is 143g/kg;
Choose the original state calcium base attapulgite clay material of Xuyi Jiangsu, its molecular composition is Mg
5si
8o
20(OH)
2(OH
2)
44H
2o;
The calcareous component content of calcium base attapulgite clay material chosen is 25%, and described calcareous molecular composition is CaMg (CO
3)
2;
The calcium base attapulgite clay material particle size size chosen is 0.5mm;
Its concrete preparation process is as follows:
(1) gather Pan Tang waterworks, Xuzhou city tail mud, through the high-pressure steam sterilizing pan process 20min of 180 DEG C of conditions, remove the bacterium and other some objectionable impuritiess that exist in mud, reduce its water ratio;
(2) described calcium base attapulgite clay material mechanical is made into particulate state, size is 0.5mm, dries under 105 DEG C of conditions;
(3) the calcium base attapulgite clay material processed through step (2) is heated 1h at the temperature of 800 DEG C;
(4) the waterworks tail mud that the calcium base attapulgite clay material that will process through step (3) and step (1) processed according to dry weight than 20:100 Homogeneous phase mixing, regulate mixture pH 8.0, solidification treatment 10d under natural environmental condition;
(5) material after step (4) solidification is made into particulate state, size is 0.6mm, dries under 105 DEG C of conditions;
The using method of above-mentioned fixing agent, the steps include:
(1) gather Z sludge of sewage treatment plant, through the high-pressure steam sterilizing pan process 20min of 180 DEG C of conditions, remove the bacterium and other some objectionable impuritiess that exist in mud, reduce its water ratio;
(2) fixing agent that said process is obtained is mixed than 120:100 by dry weight with sludge of sewage treatment plant, regulate mixture pH to be neutral or weakly alkaline, at occurring in nature natural reaction 10d;
(3) harmful substance contents such as heavy metal in the sludge of sewage treatment plant after detection reaction, its clearance reaches 95%;
(4) by process after Z sludge of sewage treatment plant be backfilling into other places, for ecological wetland construction and safeguard in the middle of.
The water ratio of Sewage Plant waste sludge is controlled 70% in described step (1);
In described step (2), fixing agent and the dry weight mixed of sludge of sewage treatment plant are than controlling as 120:100;
Controlling mixture pH in described step (2) is 8.0, in weakly alkaline.
Claims (10)
1. the preparation method of the fixing agent of sewage work's waste sludge, it is characterized in that: to use waterworks waste sludge that Fe salt and Al salt are flocculation agent for main raw material, wherein the content of Fe is 188g/kg ~ 252g/kg, the content of Al is 94g/kg ~ 143g/kg, add the rich calcium clay material of thermal treatment, waste sludge with rich calcium clay material according to dry weight than after 100:10 ~ 100:20 Homogeneous phase mixing, be prepared into the fixing agent of sewage work's waste sludge.
2. the preparation method of the fixing agent of sewage work according to claim 1 waste sludge, is characterized in that: described rich calcium clay material is calcium based sepiolite and/or calcium base attapulgite clay mineral, and described calcium based sepiolite molecular composition is Mg
4si
6o
15(OH)
26H
2o, described calcium base attapulgite clay mineral molecular composition is Mg
5si
8o
20(OH)
2(OH
2)
44H
2o.
3. the preparation method of the fixing agent of sewage work according to claim 1 waste sludge, is characterized in that: the calcareous component content of described rich calcium clay material is 15% ~ 25%, and described calcareous molecular composition is CaMg (CO
3)
2, size is 0.15mm ~ 0.5mm.
4. the preparation method of the fixing agent of the sewage work's waste sludge according to any one of claims 1 to 3, its step is;
(1) gather waterworks tail mud, through the high-pressure steam sterilizing pan process 10 ~ 20min of 100 DEG C ~ 200 DEG C of conditions, remove the bacterium and other some objectionable impuritiess that exist in mud, reduce its water ratio.
(2) described rich calcium clay material is made into particulate state, size is that 0.15mm ~ 0.5mm is dried under 105 DEG C of conditions;
(3) the rich calcium clay material processed through step (2) is heated 1h at the temperature of 800 DEG C;
(4) the waterworks tail mud that the rich calcium clay material that will process through step (3) and step (1) processed according to dry weight than 10:100 ~ 20:100 Homogeneous phase mixing, regulate mixture pH between 7 ~ 8, solidification treatment 8 ~ 10d under natural environmental condition;
(5) material after step (4) solidification is made into particulate state, size is 0.25mm ~ 0.6mm, dries under 105 DEG C of conditions.
5. the fixing agent for preparing of preparation method according to claim 1.
6. the application of the fixing agent of sewage work according to claim 5 waste sludge, it is characterized in that: in the middle of process fixing agent being used for sludge of sewage treatment plant, mix with sludge of sewage treatment plant, heavy metal ion in Adsorption sludge of sewage treatment plant and other objectionable impurities, realize the recycle of mud.
7. the application of the fixing agent of a kind of sewage work according to claim 6 waste sludge, the steps include:
(1) gather sludge of sewage treatment plant, through the high-pressure steam sterilizing pan process 10 ~ 20min of 100 DEG C ~ 200 DEG C of conditions, remove the bacterium and other some objectionable impuritiess that exist in mud, reduce its water ratio;
(2) fixing agent of sewage work's waste sludge is mixed by a certain percentage with sludge of sewage treatment plant, regulate mixture pH to be neutral or weakly alkaline, at occurring in nature natural reaction 8-10d;
(3) heavy metal harmful substance contents in the sludge of sewage treatment plant after detection reaction;
(4) sludge of sewage treatment plant after process is backfilling into other places, for construction and the maintenance of ecological wetland.
8. the application of the fixing agent of a kind of sewage work according to claim 7 waste sludge, is characterized in that: control the water ratio of sewage work's waste sludge in described step (1) 60% ~ 70%.
9. the application of the fixing agent of a kind of sewage work according to claim 7 waste sludge, is characterized in that: in described step (2), fixing agent and the dry weight mixed of sludge of sewage treatment plant are than controlling as 105:100 ~ 120:100.
10. the application of the fixing agent of a kind of sewage work waste sludge according to any one of claim 7 ~ 9, is characterized in that: control mixture pH in described step (2) between 7 ~ 8, in weakly alkaline.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109231792A (en) * | 2018-10-26 | 2019-01-18 | 南京工业大学 | A kind of sludge dehydrating agent and its preparation method and application |
| CN110092555A (en) * | 2019-05-23 | 2019-08-06 | 上海勘测设计研究院有限公司 | A kind of pollution waste sludge solidification and stabilization processing method, product and application |
| CN112979134A (en) * | 2021-04-29 | 2021-06-18 | 中铁水务集团有限公司 | Granular bioretention facility medium layer filler made of waterworks residual mud |
| CN114341080A (en) * | 2019-08-16 | 2022-04-12 | 阿尔戈农业及农业工业公司 | Composition of sludge of granular water treatment plant containing mineral additive and corresponding preparation process |
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| CN102234168A (en) * | 2010-05-06 | 2011-11-09 | 中国科学院生态环境研究中心 | Preparation and application method of mineral substance stabilizing agent for controlling releasing of phosphorus and heavy metals in dredged bottom sediment |
| CN104529099A (en) * | 2014-11-20 | 2015-04-22 | 环境保护部南京环境科学研究所 | Rigid substrate modifier used after riverway or lake dredging, and preparation method and applications thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102234168A (en) * | 2010-05-06 | 2011-11-09 | 中国科学院生态环境研究中心 | Preparation and application method of mineral substance stabilizing agent for controlling releasing of phosphorus and heavy metals in dredged bottom sediment |
| CN104529099A (en) * | 2014-11-20 | 2015-04-22 | 环境保护部南京环境科学研究所 | Rigid substrate modifier used after riverway or lake dredging, and preparation method and applications thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109231792A (en) * | 2018-10-26 | 2019-01-18 | 南京工业大学 | A kind of sludge dehydrating agent and its preparation method and application |
| CN110092555A (en) * | 2019-05-23 | 2019-08-06 | 上海勘测设计研究院有限公司 | A kind of pollution waste sludge solidification and stabilization processing method, product and application |
| CN114341080A (en) * | 2019-08-16 | 2022-04-12 | 阿尔戈农业及农业工业公司 | Composition of sludge of granular water treatment plant containing mineral additive and corresponding preparation process |
| CN112979134A (en) * | 2021-04-29 | 2021-06-18 | 中铁水务集团有限公司 | Granular bioretention facility medium layer filler made of waterworks residual mud |
| CN112979134B (en) * | 2021-04-29 | 2021-10-22 | 中铁水务集团有限公司 | Granular bioretention facility medium layer filler made of waterworks residual mud |
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| Publication number | Publication date |
|---|---|
| CN105236707B (en) | 2017-10-17 |
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