JP2012071296A5 - - Google Patents

Description

The flow block diagram which shows an example of the sludge dehydration apparatus of this invention. The flow block diagram which shows the other example of the sludge dehydration apparatus of this invention. The flow block diagram which shows the other example of the sludge dehydration apparatus of this invention. The cross-sectional perspective view of the fiber which comprises dehydration adjuvant A, B, E, G (Example). The cross-sectional perspective view of the fiber which comprises dehydration auxiliary | assistance C and D (Example). The cross-sectional perspective view of the fiber which comprises the dehydration adjuvant F (Example). The cross-sectional perspective view of the fiber which comprises the dehydration adjuvant H (Example). The cross-sectional perspective view of the fiber which comprises the dehydration adjuvant I (comparative example). The cross-sectional perspective view of the fiber which comprises the dehydration adjuvant J (commercial item) and K in the past . Sectional drawing of the fiber which comprises the dehydration adjuvant which shows a fiber diameter. Sectional drawing of the fiber which comprises the dehydration adjuvant which shows the depth to the vertex of the deepest part of the recessed part which forms a line | wire.

FIG. 9 is a perspective view of dehydration aids J and K showing the prior art . There are no recesses in the fiber cross section, and there are no streaks extending along the longitudinal direction of the fiber.
[Example 1] (Comparison with and without dehydration aid of the present invention)
To the excess sludge slurry generated from the oxidation ditch system sewage treatment plant having the properties shown in Table 2, the dewatering aid A was added so that the dry weight would be 3 wt% with SS as 100 to prepare the sludge slurry. . Next, a dehydration test was carried out using a polymer flocculant (dimethylaminoethyl acrylate methyl chloride quaternized / acrylamide copolymer, molecular weight of 4 million, adjusted to 0.2% with tap water). 200 ml of sludge was put in a 300 ml beaker, a predetermined amount of a polymer flocculant was added, and the sludge was agglomerated by changing between beakers 10 times. After measuring the size of the agglomerated sludge, the agglomerated sludge was placed on a 60 mesh nylon filter cloth, dehydrated by gravity, and the amount of filtered water after 30 seconds was measured. The sludge after gravity filtration was sandwiched between two filter cloths and squeezed for 1 minute at a pressure of ² kg / cm ² using a piston-type dehydrator. The obtained dehydrated cake was evaluated for peelability and the water content was measured. The peelability is evaluated by visually measuring the amount of cake peeled off from the filter cloth when two filter cloths are opened after dehydration. △, more than about half, but not completely peeled, ○, and the case where it adhered to the entire filter cloth and did not peel was judged as x. The results are shown in Table 3.

The flow block diagram of the apparatus used for the dewatering method of the sludge of this invention is shown in FIGS. 1-3.
FIG. 1 shows an example in which a belt press dehydrator 4 is used as a mechanical dehydrator. The sludge concentrated in the sludge concentration tank 1 is sent from the bottom of the sludge concentration tank 1 to the sludge storage tank 2 and stored for a predetermined time. Thereafter, the sludge is sent from the sludge storage tank 2 to the coagulation tank 3. The flocculation tank 3, the polymeric flocculant is added from polymer coagulant dissolving device 6, to form a floc by aggregating the sludge. Next, the aggregated floc (sludge) is sent to the dehydrator 4 and dehydrated to form a dehydrated cake. A pipe is connected from the dehydration aid supply machine 5 to one or more of the sludge concentration tank 1, the sludge storage tank 2, the coagulation tank 3, and the polymer coagulant dissolving apparatus 6 so that the dehydration aid can be added. The place where the dehydrating aid is added to the sludge may be selected separately or simultaneously from a plurality of tanks and pipes depending on the treatment status. When dehydration aid is added to the coagulation floc (sludge), the contact between the individual sludge and the dehydration aid decreases, so the dehydration aid is added to sludge before or simultaneously with the addition of the polymer flocculant. It is preferable to add. For this reason, it is particularly preferable to add the dehydrating aid to the sludge concentration tank 1 or the polymer flocculant dissolving device 6.

Claims (14)

Projection and recess formed on the cross-section outer peripheral surface of the fibrous material is, extend in the longitudinal direction,
The concave portion is formed as a moisture transfer path for transferring moisture by capillary action when the sludge contacts .
A dewatering aid for sludge , characterized in that a plurality of the fibrous materials are assembled . A plurality of fibers are aggregated, and have a plurality of recesses extending along the longitudinal direction of the fibers on the outer peripheral surface of each fiber,
The recess sludge for dewatering aid muscle which acts as a moisture transport path for transporting the sludge water is characterized by being formed extend along the longitudinal direction of the fiber by capillary action when the sludge is in contact . The fibrous material or fibers, characterized in that it is a regenerated cellulose fiber, the sludge for dewatering aid according to claim 1 or 2. The sludge dewatering aid according to any one of claims 1 to 3, wherein the fibrous material or fiber has a moisture content in a range of 30 to 80 mass%. The fibrous material or fibers, and a fiber length of 1 mm to 50 mm, and having a fiber diameter of 1 m to 100 m, the sludge for dewatering aid according to any one of claims 1-4. The sludge dehydration according to any one of claims 1 to 5, wherein the fibrous material or fiber has a cross-sectional shape formed in any of Y-type, X-type, and T-type. Auxiliary. The said fibrous material or fiber is formed in the range of 0.1-5 micrometers in the distance to the tangent which connects the vertex of an adjacent convex part, and the vertex of the deepest part of a recessed part, It is characterized by the above-mentioned. The dewatering aid for sludge according to any one of 6 above.   The dewatering aid for sludge according to any one of claims 1 to 7, wherein the fiber has a specific gravity in a dry state of 1.4 or more. In the dewatering method of sludge, which adds a polymer flocculant to organic sludge and coagulates the organic sludge, followed by pressure dewatering or mechanical dewatering,
Protrusions and recesses formed on the outer peripheral surface of the cross-section of the fibrous material extend along the longitudinal direction, and the recesses are formed as a moisture transfer path that transfers moisture by capillary action when the sludge contacts. In addition, a dehydration aid-containing polymer flocculant liquid containing a sludge dehydration aid comprising a plurality of the fibrous materials and a polymer flocculant is added to the organic sludge,
A method for dewatering sludge characterized by coagulating the organic sludge and then dehydrating under pressure or mechanically . In the dewatering method of sludge, which adds a polymer flocculant to organic sludge and coagulates the organic sludge, followed by pressure dewatering or mechanical dewatering,
A plurality of fibers are aggregated, and each fiber has a plurality of recesses extending along the longitudinal direction of the fibers, and the recesses transfer sludge moisture by capillary action when the sludge contacts. sludge for dewatering aid muscle which acts as a moisture transport passage is formed by extending in the longitudinal direction of the fibers, and polymer coagulant, the dehydrating aid containing polymer flocculant solution containing, Add to organic sludge,
A method for dewatering sludge characterized by coagulating the organic sludge and then dehydrating under pressure or mechanically . The sludge dewatering method according to claim 9 or 10, further comprising a filtration concentration step for filtering and condensing the aggregated organic sludge between the aggregation step and the pressure dehydration or mechanical dehydration step. . A sludge dewatering device that forms a coagulation floc by adding a polymer flocculant to organic sludge, pressurizing or mechanically dehydrating the coagulation floc,
A sludge storage tank for storing the organic sludge;
A coagulation tank in which a polymer flocculant is added to the organic sludge to form an aggregate floc;
A pressure dehydrator or a mechanical dehydrator for dewatering the aggregated floc;
And a polymeric flocculant dissolution apparatus for preparing the polymeric flocculant,
Protrusions and recesses formed on the outer peripheral surface of the cross-section of the fibrous material extend along the longitudinal direction, and the recesses are formed as a moisture transfer path that transfers moisture by capillary action when the sludge contacts. A dewatering aid supply machine for adding a sludge dewatering aid composed of a plurality of the fibrous materials to organic sludge ,
The dehydration aid feeder supplies the dehydration aid to at least one of the sludge storage tank, the coagulation tank, or the polymer coagulant dissolving apparatus,
In the coagulation tank, the polymer coagulant is added from the polymer coagulant dissolving device, mixed with the sludge dewatering aid,
A sludge dewatering apparatus characterized in that a stable dewatering treatment can be performed by dewatering the agglomerated floc containing the dewatering aid with a pressure dewatering machine or a mechanical dewatering machine . A sludge dewatering device that forms a floc floc by adding a polymer flocculant to organic sludge, and dewaters the flocs.
A sludge storage tank for storing the organic sludge;
A coagulation tank in which a polymer flocculant is added to the organic sludge to form an aggregate floc;
A pressure dehydrator or a mechanical dehydrator for dewatering the aggregated floc;
And a polymeric flocculant dissolution apparatus for preparing the polymeric flocculant,
A plurality of fibers are aggregated, and each fiber has a plurality of recesses extending along the longitudinal direction of the fibers, and the recesses transfer sludge moisture by capillary action when the sludge contacts. sludge for dewatering aid muscle which acts as a moisture transport passage is formed by extending in the longitudinal direction of the fibers, comprising the dehydrating aid supplier to be added to the organic sludge, a,
The dehydration aid supply machine supplies the dehydration aid to at least the polymer flocculant dissolving apparatus ,
A dehydration aid-containing polymer flocculant liquid in which a dehydration aid and a polymer flocculant are mixed is added to the coagulation tank,
A sludge dewatering device characterized in that the moisture content of sludge is reduced by dewatering the coagulated floc containing the dewatering aid with a pressure dehydrator or a mechanical dehydrator . The sludge dewatering according to claim 12 or 13, wherein a filtration and concentration unit for filtering and condensing the condensed organic sludge is provided between the coagulation tank and the pressure dehydrator or the mechanical dehydrator. apparatus.