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Method of removing a coloring component

A technology of solid content and chromaticity, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as complicated procedures and cannot be said to be satisfactory, and achieve The effect of easy processing

Inactive Publication Date: 2014-12-03
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have complicated procedures, and cannot be said to be satisfactory methods from the viewpoints of removal efficiency and economic efficiency.

Method used

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  • Method of removing a coloring component
  • Method of removing a coloring component
  • Method of removing a coloring component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0150] In a beaker, 200 ml of colored activated sludge (pH 6.2, chroma 314) from the sewage treatment plant was put into a beaker, and the colored component remover shown in Table 2 was added in a 0.1% by mass aqueous solution in a predetermined amount, and then stirred and mixed 2 Minutes, let it stand overnight. Then, for the supernatant liquid, the absorbance at a wavelength of 390 nm was measured, and the chromaticity of the supernatant liquid was calculated from the measured value to determine the coloring component removal effect. The results are shown in Table 2.

Embodiment 2

[0161] Except that 200ml of activated sludge (pH 6.7, chroma 175) from the colored urine treatment plant was used, the same operation as in Example 1 was performed, and the removal of the colored component remover shown in Table 3 below was used to determine its removal effect. Furthermore, the pH of the activated sludge was adjusted to pH 5.5 using 0.1 equivalent of hydrochloric acid, and the same operation as in Example 1 was performed to determine the coloring component removal effect. The results are shown in Table 3.

[0162] Among them, the concentration of solid floating components of activated sludge is 2,400 mg / L.

Embodiment 3

[0169] Except that 200ml of activated sludge (pH 6.8, chroma 84) from the wastewater treatment plant of the paper mill after coloring was used, the same operation as in Example 1 was performed, and the coloring component remover shown in Table 4 below was used to determine Its removal effect. The results are shown in Table 4.

[0170] Among them, the concentration of solid floating components of activated sludge is 6,100 mg / L.

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Abstract

The invention is a method of removing a coloring component. The invention provides a method of effectively removing hard biolysis water-solubility coloring components remained in activated sludge by using a small amount of organic high molecule flocculant. The method is characterized by adding a coloring component removing agent into an activated sludge mixed liquor in which a color intensity of the hard biolysis water-solubility coloring component is more than 50 under a condition that a floating solid component is more than 500mg / L, then performing solid-liquid separation, wherein the coloring component removing agent adopts at least one polymer selected from water-solubility and / or water-absorbability cation polymers (a, b), as well as a water-solubility and / or water-absorbability amphiprotic polymer (c) containing units represented by a prescribed formula, as an active ingredient.

Description

Technical field [0001] The present invention relates to a method for removing water-soluble coloring components that are difficult to biodegrade remaining in activated sludge of drainage. Background technique [0002] The activated sludge treatment method for organic wastewater is to mix the wastewater with activated sludge (hereinafter, sometimes referred to as “sludge”) in an aeration tank, and then perform aeration to solidify the sludge in the sedimentation layer and floating layer. The sludge is separated in the liquid separation tank, and the separated liquid is discharged as treated water. On the other hand, part of the separated sludge is returned to the aeration tank as return sludge, and the remaining part is discharged as excess sludge. This type of activated sludge treatment method decomposes organic matter by flocculants (activated sludge) where various microorganisms are gathered around the bacterial group such as microbes. However, the organic wastewater contains w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56C02F1/58
Inventor 石井绘美金子真
Owner MITSUBISHI CHEM CORP