CN102489073A

CN102489073A - Construction method for rapidly dehydrating dredging mud by centrifugation and plate frame

Info

Publication number: CN102489073A
Application number: CN2011103626051A
Authority: CN
Inventors: 朱伟; 张春雷; 刘青松; 包建平; 闵凡路; 周宣兆
Original assignee: Hohai University HHU
Current assignee: Hohai University HHU
Priority date: 2011-11-16
Filing date: 2011-11-16
Publication date: 2012-06-13

Abstract

The invention relates to is a construction method for rapidly dehydrating dredging mud by centrifugation and plate frame, comprising the following steps of: firstly pumping the dredging mud to a disposal site, filtering to remove large particle impurities by passing through a vibrating screen, pumping the filtered dredging mud into a centrifugal dewatering device for dehydration and reduction, and directly inputting the concentrated mud which has undergone dehydration and reduction into a plate frame filter press through a plunger pump for highly dehydration to obtain a mud cake and tail water. Therefore, integrated high concentration rapid dehydration of the dredging mud is realized, the use of a storage yard during the dredging project is avoided, the mud cake after processing can be directly used for filling, and the tail water reaches the standard and can be discharged after being processed through filtration and wetland systems.

Description

A kind of construction method of using the desilting high speed dewatering of slurries of centrifugal and sheet frame

Technical field

The present invention relates to the construction method of the desilting high speed dewatering of slurries of a kind of lake, channel cleanout generation, make the desilting high speed dewatering of slurries with processing sheet frame, belong to the resource environment field through centrifugal.

Background technology

For water quality, the assurance normal flood carrying capacity in river course and the navigation ability of improving the lake, river, large-scale dredging and desilting engineering are all being carried out in the lake of China, river course.At present, the conventional treatment method of domestic desilting mud is that deposit in the stockyard, and in the stockyard in-situ treatment as the soil utilization, or through improvement back as material use.Because receive the restriction of desilting equipment and delivery technology, bed mud becomes concentration and is in the mud between the 15-20% when desilting, volume is 4-5 times of the bed mud volume of removing, and it is quite huge to adopt the stockyard to deposit floor space.Place, stockyard problem has seriously restricted carrying out of desilting engineering.

Take up an area of problem in order to solve desilting mud stockyard, need technological improvement is carried out in the processing of mud.After the technological improvement, can be if can the moisture content of desilting mud be reduced to directly as the state that bankets and utilize, desilting mud can directly become the soil material of the usefulness of banketing.Because the large-scale urban construction of China all needs a large amount of embankment materials, desilting mud can find final outlet through being converted into the embankment material.

Summary of the invention

The objective of the invention is the problem that the stockyard area occupied is big when solving the desilting mud conditioning, blowing-filling sludge can't directly utilize.

The objective of the invention is to realize through following technical scheme:

A kind of construction method of fast dewatering of the desilting mud that uses centrifugal and sheet frame may further comprise the steps:

(1) the desilting slush pump is delivered to the processing field,, filter out large granular impurity through vibratory sieve; The screen-aperture of vibratory sieve is 5 ~ 20mm;

(2) the desilting mud after will filtering pumps into the centrifugal dehydration equipment decrement of dewatering; Concentration is that the mud moisture content after the desilting mud decrement of 15-20% is dewatered is reduced between the 60-65%;

(3) will dewater dense mud after the decrement is directly inputted to through plunger displacement pump and carries out the height dehydration in the plate and frame filter press, obtains mud cake and tail water; Moisture content is that the moisture content that the mud height dehydration of 60-65% obtains dehydrated sludge cake is reduced between the 30-35%;

(4) mud cake can directly be used as fill material, qualified discharge after the tail water process tail water filtration system; The tail water filtration system comprises sedimentation basin, quick filter tank and artificial swamp, or combination in any wherein.

The present invention utilizes the characteristics that the centrifugal dehydration time is short, efficient is high to carry out earlier the clear slurry dewatering decrement; Moisture content is reduced to about 60-65%; Service efficiency plate and frame filter press lower but effective, that can be applicable to high concentration slurry carries out the height dehydration then; Dehydration back mud moisture content is reduced to 30-35%, can be directly as the utilization of banketing of various municipal works, road foundation and hydraulic engineering etc.Key point of the present invention is the setting of matching relationship with the dehydration moisture content of mud amount.The volume ratio of centrifugal dehydration and sheet frame dehydration is 4:1.That is to say, be equipped with 200m ³/ h centrifugal dehydrator, coupling 50m ³/ h plate and frame filter press forms knockdown dewatering system can reach once the highly construction effect of dehydration.Through above process modification and be combined to form and a kind ofly do not use the stockyard to carry out the construction method of environmental protection desilting when little to the desilting amount.

Description of drawings

Fig. 1 is a process chart of the present invention.

Among Fig. 1: 1, cutter suction dredger; 2, vibratory sieve; 3, horizontal spiral centrifuge; 4, centrifugal tail water; 5, plunger displacement pump; 6, plate and frame filter press; 7, press filtration tail water; 8, mud cake; 9, sedimentation basin; 10, quick filtering ponds; 11, artificial swamp; 12, tail water filtration system.

The specific embodiment

Embodiment

Below combine specific embodiment that the present invention is described further by above-mentioned accompanying drawing:

Fig. 1 is a process chart of the present invention, and with reference to shown in Figure 1, a kind of high concentration desilting in stockyard and construction method that the dehydration of mud height utilizes do not used may further comprise the steps:

(1) utilize the bed mud in one lake, 1 pair of Jiangsu of cutter suction dredger to carry out desilting, between the concentration place 15% ~ 20% of desilting mud;

(2) through conveyer slurry transportation to grid is about 5mm vibratory sieve 2 aboard ship, filters out large granular impurity;

(2) the desilting mud after will filtering is sent into horizontal spiral centrifuge 3 decrement of dewatering, and the dense mud moisture content after the dehydration is reduced between the 60-65%, obtains centrifugal tail water 4;

(3) will dewater dense mud after the decrement is sent to and carries out the height dehydration in the plate and frame filter press 6, obtains the mud cake 8 and press filtration tail water 7 of moisture content between 30-35%; Mud cake 8 directly outward transport bankets as municipal works.

(4) precipitating certain hour in sedimentation basin 9 after, the tail water after the tail water 4 after horizontal spiral centrifuge 3 dehydrations is handled with plate and frame filter press 6 removes a part of SS and adsorbed contaminants; Supernatant gets into quick filtering ponds 10 and filters the most SS of removal; Water outlet is discharged in the artificial swamp 11, further removes COD and N, P in the tail water, adjustment sedimentation basin 9, the operational factor of filter tank 10 and artificial swamp 11 fast; Can satisfy the tail water discharge standard of demands of different, realize the cleaning discharging.

Claims

1. the construction method of the fast dewatering of a desilting mud that uses centrifugal and sheet frame may further comprise the steps:

(1) the desilting slush pump is delivered to the processing field,, filter out large granular impurity through vibratory sieve;

(2) the desilting mud after will filtering pumps into the centrifugal dehydration equipment decrement of dewatering;

(3) will dewater dense mud after the decrement is directly inputted to through plunger displacement pump and carries out the height dehydration in the plate and frame filter press, obtains mud cake and tail water;

(4) mud cake can directly be used as fill material, qualified discharge after the tail water process tail water filtration system.

2. a kind of described in the claim 1 uses the construction method of fast dewatering of the desilting mud of centrifugal and sheet frame, it is characterized in that the screen-aperture of vibratory sieve in the step (1) is 5 ~ 20mm;

A kind of described in the claim 1 uses the construction method of fast dewatering of the desilting mud of centrifugal and sheet frame; It is characterized in that in the step (2) that be that the desilting mud of 15-20% carries out the decrement dehydration through centrifugal dehydration equipment to concentration, dehydration back mud moisture content is reduced between the 60-65%.

3. a kind of described in the claim 1 uses the construction method of fast dewatering of the desilting mud of centrifugal and sheet frame; It is characterized in that in the step (3) through the moisture content that plate and frame filter press obtains step (2) being that the dense mud of 60-65% carries out height and dewaters, the moisture content of dehydrated sludge cake is reduced between the 30-35%.

4. a kind of described in the claim 1 do not use the high concentration desilting in stockyard and the construction method that the dehydration of mud height utilizes; It is characterized in that the tail water filtration system in above-mentioned (4) step comprises sedimentation basin, quick filter tank and artificial swamp, or combination in any wherein.