CN103449692A - Method for solidifying and stabilizing sludge - Google Patents
Method for solidifying and stabilizing sludge Download PDFInfo
- Publication number
- CN103449692A CN103449692A CN2013103977790A CN201310397779A CN103449692A CN 103449692 A CN103449692 A CN 103449692A CN 2013103977790 A CN2013103977790 A CN 2013103977790A CN 201310397779 A CN201310397779 A CN 201310397779A CN 103449692 A CN103449692 A CN 103449692A
- Authority
- CN
- China
- Prior art keywords
- sludge
- sepiolite
- cement
- mud
- ratio
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention relates to a method for solidifying and stabilizing sludge. The ratio of the added amount of cement to the mass of sludge is 0.25, and the ratio of the added amount of sepiolite to the mass of sludge is 0.05-0.30; the sepiolite, cement and sludge are mixed and stirred uniformly and conserved for 28 days. According to the method, sepiolite is used as an additive which is uniformly mixed with residual sludge and cement after mechanical dehydration at certain proportion so as to solidify and stabilize the sludge. Experiments indicate that after adding the sepiolite and conserving the sludge solidified body based on cement solidification for 28 days, the no-lateral confinement compressive strength is greater than or equal to 50-100kPa, the lateral pressure resistance is greatly enhanced, the leaching rate of harmful substances in the sludge is greatly reduced, the sludge solidifying and stabilizing cost is greatly lowered, and the capacity increasing ratio is greatly reduced.
Description
Technical field
The invention belongs to technical field of sewage, relate to a kind of method of solidification and stabilization mud.
Background technology
The mud that municipal sewage plant produces is that a kind of water ratio is high, and slip resistance is low, has the semi-drying waste of complicated rheological.Can not reach agricultural standard based on indexs such as sludge heavy-metals, the high cost of burning sludge, high to the disposal environmental requirement of lime-ash, for China's national situation, Sludge landfill is a kind of more reasonably selection.
Utilize sepiolite add in mud auxiliary cement carry out hydration reaction mechanism---sepiolite first adds in mud, at first sepiolite adsorbs moisture certain in mud, and in earlier stage adsorb in the hydrated reaction of cement effect heavy metal discharged from mud, promote the formation of hydration reaction.It is cemented together that sepiolite and mud serve as inorganic substance skeleton filling effect after mixing is beneficial to the hydrated product that generates with hydrated reaction of cement, forms certain intensity.The addition of the size of solidification intensity and cement, sepiolite, mud has very large relation.Mud must add the weighting agent pre-treatment just can reach certain mechanical index before landfill, current preconditioning technique is mainly used the curing/stabilizing technology of cement based, and its additive is mainly the inorganic matters such as flyash, lime, local soil and wilkinite.Adding of flyash can reduce curing cost, but flyash has certain inhibition to the hydration reaction of cement; Lime and local soil can improve the intensity of cured body, reduce the consumption of cement, but it is larger frequently to add local increase-volume native and lime, unfavorable to effectively utilizing of landfill yard; Wilkinite is auxiliary cement curing ratio additive preferably, but bentonitic price comparison is high.
Summary of the invention
In order to solve the problems of the technologies described above, reduce and solidify cost, the recycling of suiting measures to local conditions, reduce the water ratio of mud, increase the strength decreased mud Leaching of cured body, and reduce as much as possible the increase-volume ratio of solidification sludge, and improve landfill efficiency, the invention provides a kind of method of solidification and stabilization mud.
Its technical scheme is as follows:
A kind of method of solidification and stabilization mud comprises the following steps:
1) by the mechanical dehydration mode, the excess sludge water ratio is down to 72%;
2) in (0.05-0.30): 1 ratio adds sepiolite in dewatered sludge, with the rotating speed of 700r/min, stirs;
3) ratio in 0.25:1 adds cement, and the rotating speed stirring 7min with 700r/min, make cured body, unconfined compression strength >=50kPa-100kPa after maintenance 28d;
4) cured body is transported to Solid Waste Landfills with car and carries out landfill, or be transported to construction site as the building backfill soil.
Further preferably, when mud is used for landfill, sepiolite and dewatered sludge mass ratio are (0.05-0.17): 1.
Further preferably, when mud is used for building backfill soil, sepiolite and dewatered sludge mass ratio are (0.17-0.30): 1.
Compared with prior art, beneficial effect of the present invention:
The present invention, using sepiolite as additive, makes it even with excess sludge, cement mixing through mechanical dehydration by a certain percentage, makes the sludge curing stabilization.Test shows, after adding sepiolite, sludge curing based on cement solidification is recuperated and is protected 28 days unconfined compression strength >=50kPa-100kPa afterwards, lateral pressure resistant intensity greatly strengthens, in mud, the leaching yield of objectionable impurities greatly reduces, sludge curing stabilization cost greatly reduces, and increase-volume is than greatly reducing.
The accompanying drawing explanation
Fig. 1 is the relation of solidifying unconfined compression strength and cement add-on;
Fig. 2 is the impact that sepiolite leaches Zn;
Fig. 3 is the impact that sepiolite leaches Pb;
Fig. 4 is the impact that cement leaches Pb;
Fig. 5 is primary sludge XRD figure sample;
Fig. 6 is sepiolite XRD figure sample;
Fig. 7 is B
0with B
3the XRD figure sample.
Embodiment
Further illustrate technical scheme of the present invention below in conjunction with the drawings and specific embodiments.
As can be seen from Figure 1, when the cement add-on is 0.25kg/kg, the ultimate compression strength of solidification/stabilization sludge is along with the add-on of sepiolite increases and increases, when the sepiolite add-on is 0.17kg/kg, the intensity of solidification sludge is greater than 50kPa, meets the requirement of landfill factory landfill; The sepiolite add-on is 0.3kg/kg, and the intensity of solidifying sample reaches 100kPa, meets the requirement of building backfill soil.When cement content is 0.35kg/kg, the effect that adds raising solidification sludge intensity of sepiolite is fairly obvious, when the sepiolite add-on is increased to 0.17kg/kg constantly by 0, solidification sludge intensity rises to 54.8kPa by 32.7kPa, when the sepiolite add-on is 0.3kg/kg, solidification sludge intensity is up to 198.76kPa.
As seen from Figure 2, the leaching percentage of the Zn in the mud leach liquor is along with the trend that presents generally reduction that adds of sepiolite, the solidification sludge that sepiolite content is more, and wherein the leaching percentage of Zn is also lower.
As can be seen from Figure 3, the leaching of Pb, along with the performance of two kinds of metals of variation tendency and front of the add-on of sepiolite is also very similar, is all that the leaching percentage of Pb increases and reduces along with the sepiolite add-on.Visible sepiolite can effectively hinder the leaching of Pb, can keep the stability of Pb in the curing/stabilizing system.But, with the metallographic phase ratio of front, in leach liquor, Pb leaching percentage is along with the variation tendency of cement but presents very large difference.
As can be seen from Figure 4, when the add-on of cement increases, the leaching percentage of Pb also increases.Visible too much cement adds and is unfavorable for the fixing of Pb in mud, and this is because Pb (OH)
2be a kind of very typical amphoteric hydroxide, along with the continuous increase of water-content, the precipitation of hydroxide that the high pH environment that hydration reaction brings makes the Pb ion form is dissolved on the contrary.
Fig. 5, Fig. 6, Fig. 7 are respectively primary sludge, sepiolite, cured body B
0and B
3x-ray diffraction (XRD) analysis chart.As can be seen from Figure 5, the inorganic mineral composition of primary sludge is with quartzy (SiO
2) be main; As can be seen from Figure 6, the main component of sepiolite is talcum (Mg
3si
4o
10(OH)
2) and quartzy (SiO
2); As can be seen from Figure 7, at cured body B
0(not adding sepiolite) and B
3in (having added sepiolite), find all to contain CaCO
3peak value, this may be because hydrated product--hydrated calcium silicate C-S-H and the airborne CO of cement
2react and generated CaCO
3, reaction formula is as follows:
C-S-H(s)+CO
2→CaCO
3(g)+silicagel+H
2O(l)
Be also shown in cured body B from Fig. 7
3in contain sepiolite main component talcum, containing Calucium Silicate powder, and cured body B
0contain many Calucium Silicate powder in sample.After this explanation adds sepiolite in the mixture of mud and cement, cement and hydrated product thereof have occurred fully to react with other materials, thereby have made the cured body intensity enhancing.
The above, be only best mode for carrying out the invention, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses, and the simple change of the technical scheme that can obtain apparently or equivalence are replaced and all fallen within the scope of protection of the present invention.
Claims (3)
1. the method for a solidification and stabilization mud, is characterized in that, comprises the following steps:
1) by the mechanical dehydration mode, the excess sludge water ratio is down to 72%;
2) in (0.05-0.30): 1 ratio adds sepiolite in dewatered sludge, with the rotating speed of 700r/min, stirs;
3) ratio in 0.25:1 adds cement, and the rotating speed stirring 7min with 700r/min, make cured body, unconfined compression strength >=50kPa-100kPa after maintenance 28d;
4) cured body is transported to Solid Waste Landfills with car and carries out landfill, or be transported to construction site as the building backfill soil.
2. the method for solidification and stabilization mud according to claim 1, is characterized in that, when mud is used for landfill, sepiolite and dewatered sludge mass ratio are (0.05-0.17): 1.
3. the method for solidification and stabilization mud according to claim 1, is characterized in that, when mud is used for building backfill soil, sepiolite and dewatered sludge mass ratio are (0.17-0.3): 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103977790A CN103449692A (en) | 2013-09-04 | 2013-09-04 | Method for solidifying and stabilizing sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103977790A CN103449692A (en) | 2013-09-04 | 2013-09-04 | Method for solidifying and stabilizing sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103449692A true CN103449692A (en) | 2013-12-18 |
Family
ID=49732594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013103977790A Pending CN103449692A (en) | 2013-09-04 | 2013-09-04 | Method for solidifying and stabilizing sludge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103449692A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104512994A (en) * | 2014-12-16 | 2015-04-15 | 北京高能时代环境技术股份有限公司 | Curing agent for sludge solidification and stabilization and preparation and application thereof |
| CN104556920A (en) * | 2014-11-27 | 2015-04-29 | 云南省环境科学研究院(中国昆明高原湖泊国际研究中心) | Arsenic-containing neutralization slag solidifying and stabilizing agent and method for solidifying and stabilizing arsenic-containing neutralization slag by using same |
| CN106915877A (en) * | 2017-03-06 | 2017-07-04 | 邹立夫 | One kind pollution greasy filth inorganic agent and its application method |
| CN108191181A (en) * | 2018-01-12 | 2018-06-22 | 广州市水电建设工程有限公司 | A kind of urban river sediment cleanser and its production method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001062499A (en) * | 1999-08-31 | 2001-03-13 | Makoto Terunuma | Pressure dehydrating method using carbonated sludge |
| CN102424511A (en) * | 2011-09-02 | 2012-04-25 | 重庆大学 | Solidification treatment method for sludge of urban sewage plant |
-
2013
- 2013-09-04 CN CN2013103977790A patent/CN103449692A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001062499A (en) * | 1999-08-31 | 2001-03-13 | Makoto Terunuma | Pressure dehydrating method using carbonated sludge |
| CN102424511A (en) * | 2011-09-02 | 2012-04-25 | 重庆大学 | Solidification treatment method for sludge of urban sewage plant |
Non-Patent Citations (2)
| Title |
|---|
| 李磊，朱伟，林城: "骨架构建法进行污泥固化处理的试验研究", 《中国给水排水》, vol. 21, no. 6, 30 June 2005 (2005-06-30) * |
| 武燕杰: "海泡石辅助水泥固化/稳定化污泥的试验研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》, 15 July 2012 (2012-07-15) * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104556920A (en) * | 2014-11-27 | 2015-04-29 | 云南省环境科学研究院(中国昆明高原湖泊国际研究中心) | Arsenic-containing neutralization slag solidifying and stabilizing agent and method for solidifying and stabilizing arsenic-containing neutralization slag by using same |
| CN104512994A (en) * | 2014-12-16 | 2015-04-15 | 北京高能时代环境技术股份有限公司 | Curing agent for sludge solidification and stabilization and preparation and application thereof |
| CN106915877A (en) * | 2017-03-06 | 2017-07-04 | 邹立夫 | One kind pollution greasy filth inorganic agent and its application method |
| CN108191181A (en) * | 2018-01-12 | 2018-06-22 | 广州市水电建设工程有限公司 | A kind of urban river sediment cleanser and its production method |
| CN108191181B (en) * | 2018-01-12 | 2018-12-14 | 广州市水电建设工程有限公司 | A kind of urban river sediment cleanser and its production method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100522854C (en) | Solidifying agent for solidifying and stabilizing treatment of generated dewatered sludge in sewage plant | |
| Zhen et al. | Effects of calcined aluminum salts on the advanced dewatering and solidification/stabilization of sewage sludge | |
| CN100488903C (en) | Treatment method for solidifying sludge of sewage plant in city | |
| CN105236908A (en) | Soft soil curing agent prepared by means of industrial residues | |
| CN103910503B (en) | The unburned method of granulating of a kind of sludge solidification | |
| CN103319067B (en) | Environment-friendly type mud solidification method | |
| WO2005061408A1 (en) | Porous particulate material for fluid treatment, cementitious composition and method of manufacture thereof | |
| CN101638311A (en) | Slit and sludge curing agent | |
| CN101885575A (en) | Solidification/stabilization treatment method for papermaking sludge | |
| CN103275730B (en) | Barium-containing sulphoaluminate soft soil curing agent and preparation method thereof | |
| CN107021778A (en) | A kind of plant growth pervious concrete system for realizing reuse of dredging disposal and preparation method thereof | |
| CN110698157A (en) | Fly ash granulation method and filling aggregate by using all-solid-waste cementing material | |
| CN103752261B (en) | With white clay and kerosene shale ash for the method for uranium adsorbent and curing agent prepared by raw material | |
| CN111205035B (en) | Backfill prepared from red mud and wastewater as well as preparation method and application thereof | |
| CN102424511A (en) | Solidification treatment method for sludge of urban sewage plant | |
| CN103130476A (en) | Ocean dredging sludge composite solidified material | |
| CN104310884A (en) | Curing agent for attapulgite reinforced printing and dyeing sludge treatment and curing method thereof | |
| CN113149589A (en) | Soil body curing agent doped with sludge incineration ash and preparation method thereof | |
| CN104387007B (en) | Colliery low cost rapid hardening dilatancy sealing material | |
| CN103449692A (en) | Method for solidifying and stabilizing sludge | |
| CN111762998A (en) | High-temperature activated composite sludge powder solidified dewatered sludge/silt and solidification method thereof | |
| CN102432152B (en) | Method for pretreating and strengthening sludge dehydration by using acetylene sludge | |
| WO2016108245A1 (en) | Process for complete conversion of multiple industrial wastes to sustainable alternatives and usable products | |
| CN102107204A (en) | Innocent treatment process for industrial heavy metal waste residue by utilizing treating waste with waste | |
| CN102557367B (en) | Method for recycling and safely disposing aluminum-salt containing coagulated sludge |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20131218 |