Operating method for organic wastewater treatment device and organic wastewater treatment device

Patent metadata

Field	Value
Publication number	US-2016016833-A1
Application number	US-201514866647-A
Country	US
Kind code	A1
Filing date	Sep 25, 2015
Priority date	Mar 27, 2013
Publication date	Jan 21, 2016
Grant date	—

Abstract

An organic wastewater treatment apparatus includes (a) a treatment tank, (b) a plurality of membrane separation devices immersed in the treatment tank, where each membrane separation device is provided with a diffuser device and a permeated liquid extracting device, (c) a plurality of sludge characteristics measuring devices dispersedly disposed in the treatment tank, and (d) a controller. An operating method divides the treatment tank into a plurality of regions, and sets at least one of an amount of air diffusion and a flow rate of permeated liquid for each membrane separation device based on a measured value of the sludge characteristics measuring device disposed in the corresponding region. The controller sets at least one of the amount of air diffusion and the flow rate of permeated liquid based on the measured value of the sludge characteristics measuring device in a vicinity of which the membrane separation device is disposed.

First claim

What is claimed is:

1 . A method for operating an organic wastewater treatment apparatus in which a plurality of membrane separation devices are immersed in a treatment tank, the method comprising:
dividing the treatment tank into a plurality of regions; and setting an amount of air diffusion and/or a flow rate of permeated liquid for each of the membrane separation devices which is immersed in a corresponding region, based on a measured value of a sludge characteristics measuring device disposed in the corresponding region.

2 . The method for operating the organic wastewater treatment apparatus in accordance with claim 1 , wherein the sludge characteristics measuring device is constituted by a dissolved oxygen measuring device, and the setting includes:
setting, for the region in which the amount of the dissolved oxygen measured by the dissolved oxygen measuring device is smaller, a larger amount of the diffusion air and/or a smaller flow rate of the permeated liquid for the membrane separation device disposed in the corresponding region.

3 . The method for operating the organic wastewater treatment apparatus in accordance with claim 1 , wherein the amount of air diffusion and/or the flow rate of the permeated liquid of the membrane separation device in each region are/is set by changing distribution thereof among the regions while keeping a total amount of the air diffusion and/or a total flow rate of the permeated liquid of the entire organic wastewater treatment device constant.

4 . The method for operating the organic wastewater treatment apparatus in accordance with claim 2 , wherein the amount of air diffusion and/or the flow rate of the permeated liquid of the membrane separation device in each region are/is set by changing distribution thereof among the regions while keeping a total amount of the air diffusion and/or a total flow rate of the permeated liquid of the entire organic wastewater treatment device constant.

5 . An organic wastewater treatment apparatus, comprising:
a treatment tank to which water to be treated is supplied; a plurality of membrane separation devices immersed in the water to be treated in the treatment tank, each of the membrane separation devices having a diffuser device for cleaning a membrane surface and a permeated liquid extracting device for extracting permeated liquid passing through a membrane surface; a plurality of sludge characteristics measuring devices configured to measure characteristics of sludge, dispersedly disposed in the treatment tank; and a controller configured to set for each of the membrane separation devices at least one of an amount of air diffusion from the diffuser device and a flow rate of permeated liquid from the permeated liquid extracting device, based on a measured value of the sludge characteristics measuring device in a vicinity of which the membrane separation device is disposed.

6 . The organic wastewater treatment apparatus in accordance with claim 5 , wherein the sludge characteristics measuring device includes a dissolved oxygen measuring device, and wherein the controller sets at least one of:
a larger amount of the air diffusion from the diffuser device; and a smaller flow rate of the permeated liquid for the membrane separation device, when an amount of dissolved oxygen measured by the dissolved oxygen measuring device becomes smaller than a predetermined value.

7 . The organic wastewater treatment apparatus in accordance with claim 5 , wherein the controller sets at least one of the amount of the diffusion air and the flow rate of the permeated liquid for each of the membrane separation devices by adjusting an opening of a flow rate control valve or by controlling an inverter of an electric motor for controlling the flow rate.

8 . The organic wastewater treatment apparatus in accordance with claim 6 , wherein the controller sets at least one of the amount of the diffusion air and the flow rate of the permeated liquid for each of the membrane separation devices by adjusting an opening of a flow rate control valve or by controlling an inverter of an electric motor for controlling the flow rate.

Assignees

• Kubota Kk

Inventors

• Okajima Yasunobu
• Morita Yukako
• Ohtsuka Yuji

Classifications

• C02F2301/08

  Multistage treatments, e.g. repetition of the same process step under different conditions · CPC title

• C02F2209/40

  Liquid flow rate · CPC title

• C02F2209/22

  O2 · CPC title

• C02F2209/006

  comprising a software program or a logic diagram · CPC title

• C02F2209/04

  Oxidation reduction potential [ORP] · CPC title