JP2013141621A5

JP2013141621A5 -

Info

Publication number: JP2013141621A5
Application number: JP2012001619A
Authority: JP
Filing date: 2012-01-06
Publication date: 2013-11-21
Anticipated expiration: 2032-01-06

Description

本発明は、供給水を透過水と濃縮水とに分離する逆浸透膜モジュールを備えた膜分離装置と、透過水の流量を検出し、当該流量に応じた検出流量値を出力する流量検出手段と、前記膜分離装置から送出された透過水を貯留し、需要箇所に対し透過水を供給可能に接続される貯留タンクと、前記貯留タンクの水位を検出する水位検出手段と、入力された駆動周波数に応じた回転速度で駆動され、供給水を吸入して前記膜分離装置に向けて吐出する加圧ポンプと、入力された演算値信号に対応する駆動周波数を前記加圧ポンプに出力するインバータと、前記流量検出手段から出力された検出流量値が予め設定された目標流量である第１目標流量値又は当該第１目標流量値よりも流量の多い第２目標流量値となるように、前記加圧ポンプの駆動周波数を演算し、当該駆動周波数の演算値に対応する演算値信号を前記インバータに出力する流量制御部と、を備え、前記流量制御部は、前記逆浸透膜モジュールの通常運転を実行する場合には、目標流量値として前記第１目標流量値を設定し、前記逆浸透膜モジュールの一次側を洗浄するフラッシング運転を実行する時期に達した場合には、（ｉ）目標流量値として前記第２目標流量値を設定し、（ｉｉ）前記水位検出手段の検出水位値が少なくとも前記フラッシング運転中に需要箇所で消費される水量の透過水を供給可能な水位に達した場合には、前記膜分離装置から前記貯留タンクへの透過水の給水を停止して前記フラッシング運転を実行し、（ｉｉｉ）前記フラッシング運転の実行を終了した場合には、目標流量を前記第２目標流量値から前記第１目標流量値に設定する水処理システムに関する。 The present invention relates to a membrane separation device including a reverse osmosis membrane module that separates supply water into permeate and concentrated water, and a flow rate detection unit that detects a flow rate of permeate and outputs a detected flow rate value corresponding to the flow rate. And a storage tank connected to be able to supply permeated water to a demand location, a water level detecting means for detecting the water level of the storage tank, and an input drive A pressure pump that is driven at a rotational speed corresponding to the frequency, sucks the supplied water, and discharges the supplied water toward the membrane separation device, and an inverter that outputs a driving frequency corresponding to the input calculation value signal to the pressure pump And so that the detected flow rate value output from the flow rate detection means becomes a first target flow rate value that is a preset target flow rate or a second target flow rate value that is higher than the first target flow rate value. Pressure pump drive frequency Calculated, and the calculated value signal corresponding to the calculated value of the driving frequency and a flow rate controller for outputting to the inverter, the flow control unit, when executing the normal operation of the reverse osmosis membrane module The first target flow value is set as the target flow value, and when the time for performing the flushing operation for cleaning the primary side of the reverse osmosis membrane module is reached, (i) the second target flow value is set as the second target flow value. The flow rate value is set, and (ii) when the detected water level value of the water level detecting means reaches a water level that can supply at least the permeated water consumed at the demand point during the flushing operation, the membrane separation device When the flushing operation is executed by stopping the supply of permeated water from the storage tank to the storage tank, and (iii) when the execution of the flushing operation is finished, the target flow rate is set to the second target flow rate value. On water treatment system to be set to the first target flow rate value.

Claims

A membrane separation device comprising a reverse osmosis membrane module that separates feed water into permeate and concentrated water;
A flow rate detecting means for detecting the flow rate of the permeated water and outputting a detected flow rate value corresponding to the flow rate;
Reserving the permeated water sent from the membrane separation device, a storage tank connected to be able to supply permeated water to the demand point,
Water level detecting means for detecting the water level of the storage tank;
A pressure pump that is driven at a rotational speed corresponding to the input driving frequency, sucks the supplied water, and discharges it toward the membrane separation device;
An inverter that outputs a driving frequency corresponding to the input operation value signal to the pressurizing pump;
The pressurization is performed so that the detected flow rate value output from the flow rate detection means becomes a first target flow rate value that is a preset target flow rate or a second target flow rate value that is higher than the first target flow rate value. A flow rate controller that calculates a driving frequency of the pump and outputs a calculated value signal corresponding to a calculated value of the driving frequency to the inverter;
With
When the normal operation of the reverse osmosis membrane module is executed, the flow control unit sets the first target flow value as a target flow value and executes a flushing operation for cleaning the primary side of the reverse osmosis membrane module. (I) the second target flow rate value is set as the target flow rate value, and (ii) the detected water level value of the water level detection means is consumed at the demand point at least during the flushing operation. When the water level reaches a level at which a permeated amount of water can be supplied, the supply of permeated water from the membrane separation device to the storage tank is stopped and the flushing operation is performed. (Iii) The flushing operation is performed. If it is completed, the target flow rate is set from the second target flow rate value to the first target flow rate value.
Water treatment system.

The flow rate control unit performs the flushing operation when the integrated water supply time or the integrated water supply amount of permeated water supplied to the storage tank reaches a set value after the previous flushing operation is completed. To determine that
The water treatment system according to claim 1.

The second target flow rate value is 1.1 to 1.2 times the first target flow rate value.
The water treatment system according to claim 1 or 2.

When the second target flow value is set as the target flow value, the flow rate control unit has a lower recovery rate of the reverse osmosis membrane module than when the first target flow value is set as the target flow value. To increase the drainage flow of concentrated water,
The water treatment system as described in any one of Claims 1-3.