Composite coagulant and wastewater treatment system using same

A technology of composite coagulation and coagulation agent, applied in the direction of flocculation/sedimentation water/sewage treatment, chemical instruments and methods, separation methods, etc., to achieve the effect of large sedimentation velocity and strong coagulation effect

Pending Publication Date: 2021-04-02
田中 裕之
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The second conventional coagulant is a single carbide coagulant produced without activation treatment (see: Patent Document 2)

Method used

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  • Composite coagulant and wastewater treatment system using same
  • Composite coagulant and wastewater treatment system using same
  • Composite coagulant and wastewater treatment system using same

Examples

Experimental program
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Embodiment Construction

[0030] A first example of the complex coagulant of the present invention will be described.

[0031]

[0032] Room temperature: 24°C

[0033]

[0034] As the carbide coagulants A, B, C, and D, charcoal produced in a carbonization furnace manufactured by Meiwa Kogyo Co., Ltd. (Kanazawa, Ishikawa Prefecture) was prepared.

[0035] Carbide flocculant A: carbonization of rice husks at 800°C by external heat, based on the classification of stainless steel sieves to obtain finer particles with a diameter of 250 μm or less

[0036] Carbide coagulant B: carbonization of rice husks at 400°C by external heat, based on the classification of stainless steel sieves to obtain finer particles with a diameter of 250 μm or less

[0037] Carbide flocculant C: The fir chips are subjected to external thermal carbonization at 800°C, and are classified into fine particles with a diameter of 250 μm or less based on stainless steel sieves

[0038] Carbide flocculant D: The fir wood chips are ca...

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Abstract

A composite coagulant comprising a carbide coagulant and a water-soluble polymeric coagulant was added to water of interest to cause coagulation, a solution obtained after the coagulation was filtrated through a 600-mesh stainless sieve to prepare a filtrate sample, and a COD test on the filtrate sample was consigned. As a result, the COD of the water of interest was 74 ppm, and the COD of a filtrate obtained after the coagulation in the water of interest with the carbide coagulant and the water-soluble polymeric coagulant was 22 to 26 ppm. Wastewater (sewage) is subjected to solid material precipitation in a first precipitation tank 31, and is then introduced into a bubble generation tank 32. Before and after this introduction, a composite coagulant according to the present invention, i.e., a carbide coagulant and a water-soluble polymeric coagulant, is added to the wastewater. Subsequently, the wastewater is introduced into a coagulation tank 33, is then introduced into an aerobic treatment tank 34, and is finally introduced into a final precipitation tank 35, and a supernatant is discharged.

Description

technical field [0001] The invention relates to a composite coagulant and a drainage treatment system using the composite coagulant. Background technique [0002] Generally, an aerobic treatment step is included in a wastewater treatment system for treating wastewater containing high-moisture raw material biomass, such as sewage and livestock excrement. In addition, the agglomeration step of adding a coagulant is provided before or after the treatment step. It should be noted that providing the aggregation step before the aerobic treatment step can reduce the energy load of the aerobic treatment step. [0003] Usually, the coagulant is a composite coagulant in which a small amount of water-soluble polymer coagulant is added to inorganic coagulants such as polyaluminum chloride (PAC), alumina sulfate (aluminum sulfate), and polyiron sulfate (III). However, the discharge of inorganic coagulants into the environment is harmful, and therefore non-hazardous coagulants are desir...

Claims

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Application Information

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IPC IPC(8): B01D21/01C02F1/52C02F1/56
CPCC02F1/56C02F1/52B01D21/01
Inventor 田中裕之押田豊
Owner 田中 裕之
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