Filtration aid and filtration treatment method

Patent metadata

Field	Value
Publication number	US-10850995-B2
Application number	US-201615559334-A
Country	US
Kind code	B2
Filing date	Feb 24, 2016
Priority date	Mar 20, 2015
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

Provided is a filtration aid used when filtering, for example, sludge generated in a purification treatment process for water such as industrial wastewater and including a pulverized product of Corchorus olitorius, wherein a median diameter of the pulverized product is 150 micrometers or greater.

First claim

The invention claimed is:

1. A method for treating wastewater including an inorganic unnecessary substance comprising an inorganic ion, comprising the steps of:
providing a wastewater including an inorganic unnecessary substance containing at least any one of nickel, fluorine, iron, copper, zinc, chromium, arsenic, cadmium, and lead, and containing an inorganic ion which is at least any one of a nickel ion, a fluorine ion, an iron ion, a copper ion, a zinc ion, a chromium ion, an arsenic ion, a cadmium ion, and a lead ion;
insolubilizing an inorganic ion contained in the inorganic unnecessary substance included in the- wastewater to form a microfloc of suspended solid matter;
adding a composition comprising a filtration aid consisting of a pulverized product of Corchorus olitorius and a polyacrylamide to wastewater including the microfloc, wherein a median particle diameter of the pulverized product is 200 micrometers or greater but 850 micrometers or less, and wherein the adding amount of the Corchorus olitorius in the filtration aid is 2 mg/L or greater relative to a solid content in the wastewater including the microfloc; and
filtering the wastewater to which the filtration aid has been added.

2. The method of treating wastewater according to claim 1 , comprising:
adding a flocculant to the wastewater including the microfloc with
stirring to precipitate the microfloc, and settling the wastewater including the precipitated microfloc to separate the wastewater into a supernatant and sludge prior to addition of the filtration aid.

3. The filtration treatment method according to claim 1 , wherein a ratio by mass between an adding amount of the Corchorus olitorius in the filtration aid and an adding amount of the polyacrylamide is from 90:10 through 10:90.

4. The filtration treatment method according to claim 3 , wherein the ratio by mass between the adding amount of the Corchorus olitorius in the filtration aid and the adding amount of the polyacrylamide is from 70:30 through 30:70.

5. The filtration treatment method according to claim 1 , comprising the step of classifying and removing the filtration aid having a particle diameter less than 150 micrometers and greater than 850 micrometers prior to adding the filtration aid to the microfloc.

6. The filtration treatment according to claim 1 , wherein an adding amount of the Corchorus olitorius and the polyacrylamide in the filtration aid is 7 mg/L or greater relative to a solid content in the wastewater including the microfloc.

Assignees

• Dexerials Corp

Inventors

• Hasegawa Masato
• Shimada Ryu

Classifications

• C02F11/147

  using organic substances (C02F11/148 takes precedence) · CPC title

• C02F1/64

  of iron or manganese · CPC title

• C02F1/62

  Heavy metal compounds · CPC title

• C02F1/58

  by removing specified dissolved compounds (using ion-exchange C02F1/42; softening water C02F5/00) · CPC title

• B01J20/24 Primary

  Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives · CPC title