CN100425555C - Pipeline sludge solidification treatment method - Google Patents

Abstract

The present invention relates to a pipeline sludge solidification treatment method suitable for the hydraulic reclamation treatment of sludge. The method comprises the following operation steps that (1) an indoor solidification test for sludge to be solidified is carried out to determine the relation between the unconfined compression strength qu of the sludge to be solidified and the total water cement ratio W/C: qu=k1(W/C)<k2>; (2) dredged sludge passes through a sieve with the specification of 1cm; (3) the water content of the sludge after the sieve is measured; (4) cement slurry is input into a transportation pipeline, and the water cement ratio of the cement slurry is adjusted according to the target total water cement ratio and the target water content; (5) under the action of high pressure gas, the mixture of the sludge and the cement slurry flows forwards, the sludge is thoroughly mixed with the cement slurry, and cement solidified sludge which is already uniformly stirred is obtained at a pipeline outlet; and along increase in the age, the strength of the solidified sludge is enhanced so that a novel filling material is obtained.

Description

Pipeline sludge solidification treatment method

Technical field

The present invention is a kind of sullage solidifying method, is applicable to the processing of blowing-filling sludge, belongs to the foundation treatment technology field.

Background technology

Along with China's rapid economic development, construction projects such as port engineering, waterway engineering, hydro project increase sharply, in the dredging process in various navigation channels with the harbour is newly-built, in the extension project, can produce a large amount of dredging earth usually.According to incompletely statistics, the annual depleted dredging silt of China reaches 10,000 ten thousand m ³More than, the quantities that dredging silt is handled is very considerable.At present often the process for treating sludge that adopts has two kinds, the one, mud is thrown into marine, the 2nd, dash in cofferdam, offshore place and to fill out epeirogenetic.The subject matter of throwing the mud processing is that existing spoil area uses for many years, and capacity day hastens towards saturation, and be difficult to hold toppling over of following heavy construction mud, and the backflow effect makes dredging effect have a greatly reduced quality.Directly throw the mud processing in addition and can pollute waters or land environment on every side, throw the restriction that the mud method more and more is subjected to each side at present.Mud leaks in a large number, serious backflow phenomenon towards filling out towards filling out the frequent appearance of epeirogenetic in cofferdam, offshore place.Because the engineering properties of mud, the blowing-filling sludge consolidation time is very long, needs usually several years even the longer time, and needs to spend a large amount of expenses after filling out ground is handled dashing.On the other hand, Large scale construction along with China traffic harbour and beach facility, sea wall, roadbed, place construction need a large amount of banking materials, at present mainly be to solve by the massif around the exploitation, both influenced the ecotope of massif, the severe of building stones has strengthened expense and difficulty that ground is handled greatly again.Near sludge treatment if can be become banking material, can turn waste into wealth, be used for engineering and both can have saved a large amount of sandstone material, can protect environment again, reduce expense and difficulty that ground is handled by mud being cured handle.

For this reason, mud is cured processing, makes it to become that a kind of technology is reliable, the novel fill material of economical rationality.Abroad the sludge solidification of (as Japan) adopts special-purpose barge more, and its equipment requirements height, level of automation height, cost are also very high.The curing cost of this mud is greater than 200 yuans every cubic metre, and this technology is not suitable for the national conditions of China.

Summary of the invention

Technical problem: the purpose of this invention is to provide a kind of easy construction, simple to operate, fast and effectively the sludge solidification technology operation method.Thereby the secondary treatment that can save mud on the one hand of this worker's method, and then simplify the program curing of mud, and can utilize curing sludge to form a kind of novel fill material on the other hand, be applied to engineering construction, save a large amount of sandstone material.

Technical scheme: present method is utilized the shearing action of carrying the mud process to produce in the pipeline in conjunction with the practical situation of China, directly in the pipeline transportation process mud is added solidifying agent and mixes and stirs curing, and the protection environment is turned waste into wealth.Pipeline transportation is adopted in the transportation of dredging silt, and its distance is generally to 2～3km.It is exactly in the pipeline transportation process of mud that pipeline sludge solidifies worker's method, adds solidifying agent (as cement grout) in pipeline, utilizes the pushing effect of high-pressure air, makes the mixture of mud and cement shear rolling and stirring in pipeline.The cement solidification soil that can obtain stirring in the outlet of transport pipeline, thus a kind of novel filling material obtained.

This invention mainly is to utilize the transportation of mud in pipeline to carry out sludge solidification, forms a kind of novel sludge solidification treatment technology.Concrete constructing operation step is as follows:

1) will treat that solidified mud carries out indoor solidity test, determines to treat the unconfined compression strength q of curing sludge _uRelation with the total water-cement ratio W/C $q_u=k_1{(W/C)}^{{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="C20061003897300071.png"\; state="\{\{state\}\}">k</figure-callout>}}_2},$ Unconfined compression strength according to curing sludge is target strength q _uDetermine target the total water-cement ratio W/C and target water content W thereof;

2) with the sieve of dredging silt through the 1cm specification, the diameter of removing erratic boulder in the mud, animals and plants remains etc. is greater than the 1cm particle;

3) the mud water content after mensuration is sieved guarantees the flowing property of mud in transport pipeline, as the water that need add according to the requirement of target water content, the flowing property of regulating mud;

4) in transport pipeline, import cement grout, according to the water cement ratio of target the total water-cement ratio and target water content adjusting cement grout;

5) under the effect of high pressure gas, mud adds cement paste mixture and flows forward and thorough mixing, the cement solidification mud that obtains stirring at pipe outlet; With the increase in the length of time, curing sludge intensity increases, thereby obtains a kind of novel filling material.

Unconfined compression strength q _uRelation with the total water-cement ratio W/C $q_u=k_1{(W/C)}^{{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="C20061003897300071.png"\; state="\{\{state\}\}">k</figure-callout>}}_2}$ In, k ₁And k ₂Be the parameter relevant with cement characteristics, determine to obtain k by indoor solidity test with the soil nature parameter ₁Scope be 10～200kPa, k ₂Scope be 0.5～1.0.

Beneficial effect: pipeline sludge solidification treatment worker method easy construction, simple to operate.Its advantage mainly contains:

(1) this worker's method does not need large-scale sludge solidification factory, does not need large-scale sludge solidification equipment simultaneously yet, simplifies the sludge solidification program, directly utilizes the pipeline transportation process of mud to carry out sludge solidification;

(2) can turn waste into wealth, not only can reduce environmental pollution, the protection environment can also be produced a kind of novel fill material by sludge solidification, is applied to engineering construction, saves a large amount of sandstone material.

Description of drawings

Fig. 1 is the schematic flow sheet of sludge solidification.

Fig. 2 is the motor pattern figure of mud+cement paste mixture in transport pipeline.

Have among the above figure: water pump 1, under meter 2, high-pressure slurry air pump 3, silt slurry 4, mud transport pipeline 5, grout and slurry mixture 6, cement slurrypump 7, agitator 8 filters back mud 9.

Fig. 3 is unconfined compression strength of solidified soil q _uWith the total water-cement ratio W/C graph of a relation.Among the figure: k ₁And k ₂Unconfined compression strength q for curing sludge _uRelation with the total water-cement ratio W/C $q_u=k_1{(W/C)}^{{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="C20061003897300071.png"\; state="\{\{state\}\}">k</figure-callout>}}_2}$ In coefficient, at the log of Fig. 3 (q _u) and log (W/C) coordinate in log (k ₁) for W/C be 1 o'clock log (q _u) be worth, be the intercept of this coordinate, and k ₂Be log (q _uThe slope of)～log (W/C) relation.

Embodiment

Territory, coastal waters, Fujian province Jiangkou need be filled out the land and make ground, intends adopting pipeline sludge solidified method to carry out epeirogenetic.The water content of the marine mud in this marine site is 105%, and unit weight is 1.5 tons/m ³, the mud after require solidifying in the engineering during the 90 day length of time intensity reach 200kPa.

1) through the indoor Mix Ratio Test of this mud is recorded, the unconfined compression strength q in this mud 90 day length of time behind overcuring _uWith coefficient k in the relational expression of the total water-cement ratio W/C ₁And k ₂Be respectively 50 and 0.8, thereby can extrapolate when satisfying the design strength requirement, the total water-cement ratio W/C is 5.6.Through mensuration when the water content of mixture 150% the time, its flowability is fine, thereby to get target water content be 150%.Therefore, every cubic metre the mud cement that need add is 1700*1.5/2.5/5.6=182kg.

2) with the sieve of dredging silt through the 1cm specification, the diameter of removing erratic boulder in the mud, animals and plants remains etc. is greater than the 1cm particle;

3) the sieve water content of back mud is 105%, can flow under the pressure effect of high-pressure slurry air pump, so do not need to add water again in mud.

4) general objective water content W is 150%, and the water content of marine mud is 105%, and every cubic metre the water that also need add 238kg for this reason is so the water cement ratio of cement grout is 182/238=1.25;

5) under the effect of high pressure gas, mud adds cement paste mixture and flows forward and thorough mixing, the cement solidification mud that obtains stirring at pipe outlet; With the increase in the length of time, curing sludge intensity increases, thereby obtains a kind of novel filling material.

Claims (1)

1. pipeline sludge solidification treatment method, feature is that present method comprises following operation steps:

1) will treat that solidified mud carries out indoor solidity test, determines to treat the unconfined compression strength q of curing sludge _uRelation with the total water-cement ratio W/C $q_u=k_1{(W/C)}^{k_2}$ , be target strength q according to the unconfined compression strength of curing sludge _uDetermine target the total water-cement ratio W/C and target water content W thereof; K wherein ₁And k ₂Be the parameter relevant with cement characteristics, determine to obtain k by indoor solidity test with the soil nature parameter ₁Scope be 10～200kPa, k ₂Scope be 0.5～1.0;

2) with the sieve of dredging silt through the 1cm specification, the diameter of removing erratic boulder in the mud, animals and plants remains is greater than the 1cm particle;

3) measure mud water content after sieving, guarantee the flowing property of mud in transport pipeline, add entry, regulate the flowing property of mud according to the requirement of target water content;

4) in transport pipeline, import cement grout, according to the water cement ratio of target the total water-cement ratio and target water content adjusting cement grout;

5) under the effect of high pressure gas, mud adds cement paste mixture and flows forward and thorough mixing, the cement solidification mud that obtains stirring at pipe outlet; With the increase in the length of time, curing sludge intensity increases, thereby obtains a kind of filling material.

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