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Method for treatment of sludge or wastewater

A treatment method and technology for wastewater, applied in sludge treatment, sludge treatment, water/sludge/sewage treatment, etc., can solve the problem of low efficiency of flocculation sludge dewatering treatment, and achieve the goal of inhibiting deterioration and exerting flocculation performance. Effect

Inactive Publication Date: 2009-04-29
DIA NITRIX CO LTD (JP)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When sludge is flocculated using such a degraded flocculant aqueous solution, the dehydration efficiency of the obtained flocculated sludge tends to be lowered, and the current situation is that such a partially degraded aqueous solution has to be used.

Method used

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  • Method for treatment of sludge or wastewater
  • Method for treatment of sludge or wastewater
  • Method for treatment of sludge or wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0090] Hereinafter, although an Example demonstrates this invention in more detail, it is not limited to this range in the range which does not deviate from the summary of this invention.

[0091]

[0092] (modulation example 1)

[0093] The preparation and supply of the flocculant aqueous solution is carried out using a rotary flocculant continuous dissolving supply device, the device has: a cylindrical filter member with a filter surface having a mesh of 200 μm in the peripheral surface; the inner surface connected to the peripheral surface of the filter member A roller made of elastic body that rotates; a pump that transports the aqueous flocculant solution that passes from the inside of the filter member to the outside. That is, while stirring the well water, a polymer flocculant was added thereto at a constant rate to a concentration of 0.2% by mass, and then the stirring was stopped to allow swelling. The swollen swelling liquid is supplied to the inner side of the fi...

example 1～5

[0124] Using the powdery polymer flocculant 1, an aqueous flocculant solution was prepared in the same manner as Preparation Example 1, and a flocculation dehydration test was performed using sludge A. Here, the mesh of the filter member was changed as shown in Table 3. The amount of the aqueous flocculant solution added to the sludge A was set so that the concentration of the polymer flocculant relative to the solid matter (the same applies hereinafter) was 0.4% by mass.

[0125] Table 3 shows the evaluation results of drainability (filtered water amount) and dewaterability (cake water content). In addition, the viscosity of the prepared aqueous flocculant solution was measured at 12 rpm with a Brookfield type rotational viscometer in a constant temperature tank at 25°C, and the results are shown in Table 3.

[0126] [table 3]

[0127]

[0128] From the results in Table 3, the drainage of the sludge flocculation treatment in Examples 1 to 3 and the dewaterability of the ...

example 6～11

[0130] Using the powdery polymer flocculant 1, an aqueous flocculant solution was prepared in the same manner as Preparation Example 1, and a flocculation dehydration test was performed using sludge A. Here, after adding the powdery polymer flocculant to water and stirring, the residence time during swelling was changed as shown in Table 4 by adjusting the swelling time before filtration. The quantity of the aqueous flocculant solution added to sludge A was the same as Examples 1-5, and it was 0.4 mass % with respect to solid matter. The same evaluations as in Examples 1 to 5 were performed, and the results are shown in Table 4. Combine the results of Example 2 to show.

[0131] [Table 4]

[0132]

[0133] From the results in Table 4, in Examples 2 and 6 to 8 in which the residence time at the time of swelling was 1 to 20 minutes, the drainage in the sludge flocculation treatment and the dehydration property of the flocculated sludge were excellent. Example 9 is an examp...

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Abstract

A method of treating sludge or wastewater involving the following steps: a swelling step which prepares a swelling liquid by adding a powdery polymer flocculant to water; a dissolution step which obtains an aqueous flocculant solution by supplying the swelling liquid to a filtration component and passing a filtering area of the filtration component; a flocculation treatment step which adds the aqueous flocculant solution to sludge or wastewater, wherein the total processing time from the time point where the powdery polymer flocculant was added to water until just before adding to sludge or wastewater to the aqueous flocculant solution is less than 3 hours.

Description

technical field [0001] The invention relates to a treatment method for flocculating sludge or waste water by using a polymer flocculant. [0002] This application claims priority based on Japanese Patent Application No. 2006-109626 filed with Japan Patent Office on April 12, 2006, the contents of which are incorporated herein by reference. Background technique [0003] As a method of flocculating sludge generated during wastewater treatment or the like, a method of adding a diluted aqueous solution of a polymer flocculant to sludge is widely used. Polymer flocculants are usually sold in the form of powder or W / O emulsion, but powdered polymer flocculants are superior to liquid or emulsion polymer flocculants in terms of product stability and ease of transportation. , is widely used as a product. However, the powdery polymer flocculant has a high molecular weight and its aqueous solution has a very high viscosity, so the powdery polymer flocculant is not easy to dissolve, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14C02F1/56B01D21/01
CPCC02F2209/44C02F1/001C02F1/56C02F11/14C02F11/147Y02W10/20B01D29/00
Inventor 込堂寿章秋本昌宏
Owner DIA NITRIX CO LTD (JP)
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