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Method of flocculation

A technology for coagulation treatment and water treatment, which is applied in the direction of filtration treatment, separation method, flocculation/sedimentation water/sewage treatment, etc., and can solve the problems of reducing the amount of inorganic coagulant used

Inactive Publication Date: 2011-07-27
落合寿昭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0028] That is, although it is possible to actively make full use of the contact material storage tank introduced by Non-Patent Document 5, that is, the contact material (Raschig ring) that collects the floc residue by contacting with the micro flocs and flocs accumulates coarse particles. The filtering function of the filter layer, but in the prior art, there is no disclosure or suggestion at all that the structure that can reduce the usage amount of the inorganic coagulant by actively making full use of the function of the contact material accumulation tank

Method used

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Examples

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Effect test

Embodiment 1

[0131] The feature of Example 1 is that in the contact material accumulation tank 12, the water 1 to be treated is made to flow from the lower side to the upper side.

[0132] As described above, when the water to be treated 1 is moved from the bottom to the top, the flocs collide or come into contact with the contact material, and the sedimentation phenomenon occurs in the same manner as in the sedimentation tank 21. Compared with the case of moving from the top to the bottom, the coarse filtration efficiency is improved.

[0133] The efficiency of such a rough filtration efficiency is nothing more than increasing the degree to which flocs having a particle size of 7.0 μm or more remain (filtered) in the contact material accumulation tank 12 , thereby increasing the overall filtration rate.

Embodiment 2

[0135] The feature of Example 2 is that a coagulant is injected again into the water to be treated 1 flowing out of the contact material accumulation tank 12 and flowing into the sand filter layer 14 .

[0136] As described above, when 0.5 mg / L or more of the flocculating agent is injected into the sand filter layer 14 again, flocculation of fine particles in the sand filter layer 14 occurs, and the filtration efficiency in the sand filter layer 14 is improved.

[0137] In particular, when the water to be treated 1 that has passed through the sand filter layer 14 is not used as purified water but as discharge water, flocs having a large particle size are also captured in the surface layer portion in the sand filter layer 14 in advance. As a result, purified water with low turbidity can be obtained, and in this case, re-injection of 0.5 mg / L or more of the flocculating agent promotes the effect of discharging water.

Embodiment 3

[0139] Embodiment 3 is characterized in that, as Image 6 As shown, the contact material accumulation tank 12 is filled with the upper limit of flocs containing flocs having a particle size of 7.0 μm or more, and the excess flocs are discharged from the discharge port 16 and closed at the inflow stage of the water to be treated 1 . The valve 15 of the discharge port 16 .

[0140] When the flocs containing flocs having a particle size of 7.0 μm or more are filled in the inlet of the contact material accumulation tank 12 and / or the vicinity of the above-mentioned inlet, the filling amount of the flocs naturally exists in an appropriate amount.

[0141] That is, when the filling amount is too large, the filtration rate of the micro-flocs and the flocs increases rapidly, but conversely, the residual (filtration) of the micro-flocs and the flocs in the contact material collecting tank 12 rapidly progresses Therefore, the time for which the contact material accumulation tank 12 tha...

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Abstract

A method of flocculation for treating water to be treated is provided which attains a significant improvement in the percentage of flocs remaining in a contact-material accumulation tank (filtration rate). While using an inorganic flocculant in a limited amount, fine flocs and flocs which have an increased density and a reduced size can be formed and the degree of inflow of the fine flocs into a sand filtration layer can hence be reduced. In the method, use is made of a contact-material accumulation tank (12) interposed between the step of forming fine flocs and the sand filtration step, and flocs having a particle diameter of 7.0 [mu]m or larger are packed beforehand into the inlet of the contact-material accumulation tank (12) and / or an area near the inlet. Due to the constitution, the percentage of flocs with a particle diameter of 7.0 [mu]m or larger remaining in the contact-material accumulation tank (12) (filtration rate) is kept at 80% or higher from the initiation of passing of the water being treated (1).

Description

technical field [0001] The present invention relates to a coagulation treatment method of water to be treated by injecting an inorganic coagulant into water to be treated such as river water, rainwater, and factory waste water through a microflocculation process and a residual (filtration) process. , the fine suspended particles contained in the water to be treated are agglomerated to form micro flocs; the residual (filtration) process filters the flocs while promoting the flocculation of the micro flocs, and the contact material accumulation tank and sand filter layer to achieve. Background technique [0002] Coagulation treatment of treated water is adopted as a pretreatment of sand filtration, but in this coagulation method, by injecting an inorganic coagulant into the treated water, micro flocs, which are fine suspended particles contained in the treated water, are made as much as possible. Flocculation is carried out by agglomeration as much as possible, and the retent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52B01D21/00B01D21/01B01D21/02B01D21/08B01D21/30
CPCC02F2103/007C02F2103/001B01D21/01C02F1/001C02F1/34C02F1/5236
Inventor 落合寿昭
Owner 落合寿昭
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