JPH04108519A - Concentration apparatus - Google Patents

Abstract

PURPOSE:To highly concentrate a solution to be treated without being accompanied by the suppression of a supply amount by providing membrane separators in a plurality of the tanks arranged along a liquid flow path and successively enhancing the concn. of the solution to be treated from the tank positioned on the upstream side toward the tank positioned on the downstream side. CONSTITUTION:Sludge 2 to be treated flows from an upstream part to a downstream part to successively flows in respective tanks 3. Suction pumps 6 are driven in the respective tanks 3 and the sludge 2 to be treated is subjected to solid-liquid separation by membrane separators 7 to be conc. Therefore, the sludge 2 to be treated conc. in the tank 3 on the upstream side flows in the next tank 3 to be conc. at high concn. and flows down through a sludge flow path 1 while the concn. of the sludge 2 to be treated is successively enhanced in the respective tanks 3. Therefore, the sludge 2 to be treated is conc. to predetermined concn. while it flows down through the sludge flow path 1 to reach the terminal of the flow path 1 and the conservation of energy required in operation is achieved without separately requiring power.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a concentrating device for concentrating liquid, sludge, etc. using a membrane separation device.

BACKGROUND ART Conventionally, as an apparatus for concentrating liquid/sludge (hereinafter abbreviated as sludge), for example, a membrane separation apparatus is arranged in a single tank. First, the sludge in a single tank is set to a predetermined concentration by solid-liquid separation using a membrane separator, and then the amount of new sludge supplied to the single tank, the amount of separated liquid taken out by the membrane separator, and The amount of sludge discharged from the single tank is adjusted to balance the amount of sludge discharged from the single tank, and the sludge in the single tank is continuously concentrated while maintaining the sludge at a predetermined concentration.

Problems to be Solved by the Invention However, in the conventional configuration described above, the flux (permeation flux) of the separated liquid in the membrane separation device and the concentration of sludge tend to be inversely proportional. That is, when the concentration of sludge in the tank is high, the flux in the membrane separation device becomes low, and when the concentration is low, the flux in the membrane separation device becomes high. Therefore, when concentrating sludge to a high concentration in a single tank, since the flux is low, it is necessary to suppress the amount of sludge supplied to the single tank, resulting in an unavoidable reduction in processing capacity.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a concentrating device that can concentrate a liquid to be treated to a high concentration without reducing the supply amount.

Means for Solving the Problems In order to solve the above problems, the present invention provides a liquid flow path through which the liquid to be treated flows from the upstream side to the downstream side, and connects a plurality of tanks arranged along the liquid flow path to sludge. Each tank is connected to a flow path, and a membrane separation device is installed inside each tank, so that the concentration of the liquid to be treated in each tank increases sequentially from the tank located on the upstream side to the tank located on the downstream side. It is something.

Operation With the above-described configuration, the liquid to be treated that has flowed into the liquid flow path flows down from the upstream side to the downstream side and sequentially flows into each type, where it is separated into solid and liquid by the membrane separator and concentrated. That is, the liquid to be treated that has been concentrated in the upstream tank flows into the tank, and the liquid to be treated is concentrated to a higher concentration in the tank and flows out into the liquid flow path. Thereafter, the liquid to be treated flows down the liquid flow path while its concentration is successively increased in various ways. At this time, the fluxes of the various membrane separators decrease in inverse proportion to the concentration of the liquid to be treated, and the flux of the membrane separator in the tank located upstream is greater than the flux of the membrane separator in the tank located downstream. Therefore, in each case, the liquid to be treated is continuously concentrated while maintaining the flux according to the concentration of the liquid to be treated at that location.

Therefore, while flowing down the liquid flow path, the liquid to be treated is concentrated to a predetermined concentration by the time it reaches the downstream end of the liquid flow path.

Further, since the liquid to be treated is transferred from the tank to the tank by natural flow due to the head of the liquid flow path without requiring additional power, energy required for operation can be reduced.

EXAMPLE An example of the present invention will be described below based on the drawings. 1st
In Figures 1 to 3, the sludge channel 1 is formed at a predetermined slope so that the sludge 2 to be treated naturally flows from the upstream side to the downstream side. A plurality of tanks 3 are arranged along the sludge flow path 1, and each type of tank 3 communicates with the sludge flow path 1 via an inflow hole 4 and an outflow path 5. Furthermore, a membrane separator 7 that communicates with a suction pump 6 is provided inside each type 3, and an aeration pipe 9 that communicates with an air supply pump 8 is provided below the membrane separator 7. The concentration of sludge in each type 3 is successively concentrated from the tank 3 located on the upstream side to the tank 3 located on the downstream side.

Hereinafter, the effects of the above configuration will be explained.

The sludge 2 to be treated that has flowed into the sludge flow path 1 sequentially flows into each type 3 through the inlet holes 4 while flowing downward from the upstream side to the downstream side. In each type 3, the suction pump 6 is driven to separate solid-liquid and concentrate the sludge 2 to be treated in the membrane separator 7, and the air supplied by the air supply pump 8 is transferred to the aeration pipe 9.
The sludge to be treated 2 is agitated and the membrane surface of the membrane separation device 7 is washed. Therefore, the tank 3 on the upstream side
The sludge to be treated 2 concentrated in the tank 3 flows in, the sludge to be treated 2 is concentrated to a higher concentration in the tank 3, and flows out into the sludge flow path 1 through the outflow path 5. Hereafter, treated sludge 2
The sludge flows down the sludge channel 1 while the sludge concentration is successively increased in each type 3. At this time, the flux of each type 3 membrane separator 7 decreases in inverse proportion to the concentration of the sludge 2 to be treated,
Since the flux of the membrane separator 7 of the tank 3 located on the upstream side is larger than the flux of the membrane separator 7 of the tank 3 located on the downstream side, in each type 3, the flux to be treated is maintained while maintaining the flux commensurate with the sludge concentration. Sludge 2 is continuously thickened.

Therefore, while the sludge 2 to be treated flows down the sludge channel 1, it is concentrated to a predetermined sludge concentration by the time it reaches the end of the sludge channel 1. Further, the transfer of the sludge 2 to be treated from the tank 3 to the tank 3 is carried out by natural flow due to the head of the sludge channel 1 without requiring any additional power, so that the energy required for operation can be reduced.

Effects of the Invention As described above, according to the present invention, by repeatedly concentrating the liquid flowing down the liquid flow path in each type so that the concentration of the liquid to be treated increases sequentially, the liquid to be treated flows down the liquid flow path. In time, the liquid is concentrated to a predetermined concentration by the time it reaches the downstream end of the liquid flow path. In addition, the transfer of the liquid to be treated from tank to tank is
Since the liquid flow is carried out by natural flow due to the head of the liquid flow path without requiring additional power, the energy required for operation can be reduced.

[Brief explanation of drawings]

FIG. 1 is an overall plan view of a sludge thickening apparatus showing one embodiment of the present invention, FIG. 2 is an overall vertical sectional view of the same embodiment, and FIG. 3 is an enlarged view of the main part of FIG. 2. 1... Sludge channel, 2... Sludge to be treated, 3... Tank,
7... Membrane separation device.

Claims (1)

[Claims] 1. Provide a liquid flow path through which the liquid to be treated flows from the upstream side to the downstream side, provide multiple tanks arranged along the liquid flow path and communicate with the sludge flow path, and install a membrane separation device inside each tank. 1. A concentrating device characterized in that the concentration of the liquid to be treated in each tank is increased sequentially from the tank located on the upstream side to the tank located on the downstream side.