JPH03245899A - Method for preventing blocking of flow of liquid in purifying tank - Google Patents

Abstract

PURPOSE:To obtain an ideal purifying tank by changing the shape of a contact material packed as a hotbed of bacteria corresponding to the concn. change of BOD shown by the liquid in the purifying tank. CONSTITUTION:Hotbeds of bacteria purifying sewage 2 by decomposing and taking in the org. matter in the sewage 2 are packed with various contact materials 9, 10, 11 within respective aeration chambers so as to reduce the sizes thereof corresponding to the concn. of BOD of the liquid in a purifying tank. The sewage 2 taken in the purifying tank from the inflow port 1 thereof is purified in the primary, secondary and tertiary aeration chambers 6, 7, 8 through primary and secondary putrefying (separating) chambers 3, 4 and a flow rate control tank 5 to be discharged as purified water through a treatment chamber.

Description

[Detailed Description of the Invention] Conventionally, in general septic tanks and small-sized combined septic tanks that biochemically treat human waste and gray water, the incoming sewage is subjected to putrefaction and chemical separation as the primary treatment. and sent to the secondary aeration room.

Organic substances in the sent wastewater are adsorbed by microorganisms formed in the aeration chamber, and are then oxidized and decomposed to gradually purify the water.

During this time, as a breeding ground for microorganisms, the contact material filled with organic matter and suspended matter in the sewage is likely to cause scale buildup on the high BOD surface, eventually leading to a state of blockage. .

In order to eliminate this phenomenon, the present invention reduces the size of the contact material to be filled in accordance with the BOD concentration of the tank liquid.

For example, if a large septic tank is installed with an aeration room or a primary, secondary, and tertiary stage, a large contact material is placed in the first stage, a medium-sized one in the second, and a small one in the tertiary. In the aeration chamber of a small combined purification tank, the size of the contacting material is gradually reduced and arranged in the same room from bottom to top in the same direction as the flow of tank liquid.

That is, as the BOD (biochemical oxygen demand) decreases, the size of the contact material gradually decreases.

To explain this with a drawing, the sewage (2) taken in from the inlet (1) of the septic tank (Figure 1) is transferred to the primary (3) and secondary (4) septic (separation) chambers.
The water passes through a flow rate adjustment tank (5), etc., is purified in a primary aeration chamber (6), a secondary aeration chamber (7), and a tertiary aeration chamber (8), and is discharged through a treatment chamber, etc.

At this time, in each aeration room, contact materials of various types (
9) Filled with (10) and (11).

The shapes of these contact materials are changed and filled as shown in Figures 2, 3, and 4.

If the present invention is applied to doll purifiers and general household septic tanks that are currently installed on the market, there will be no clogging of sewage due to scale accumulation on the surface of the contact material, and therefore there will be no need to install water pipes, etc. for unclogging. It is possible to reduce equipment costs and maintenance costs after operation by making the barrel smaller.

The present invention makes a great contribution to the research and development of ideal septic tanks, which are the most important source of domestic wastewater, which is the most neglected area in the creation of a civilized living environment, and which is the greatest base for river purification in urban development.

[Brief explanation of drawings]

The accompanying figures are an overall schematic representation of the invention and a diagrammatic representation of the filled contact material. Figure 1... - Overall schematic diagram 1... Sewage inlet 2... Sewage 3... Primary putrefaction (minute@) chamber 4... Secondary putrefaction (molecule a) chamber 5... Flow rate adjustment tank 6... Primary aeration chamber 7... Secondary aeration chamber 8... Tertiary aeration chamber 9... - Large contact material 10... Medium contact material 11...Small contact material procedural amendment June 25, 1990

Claims (1)

[Claims] A mechanism that changes the shape of a cylindrical contact material filled in the aeration chamber of a septic tank as a breeding ground for microorganisms according to changes in the concentration of BOD (biochemical oxygen demand) shown by the tank liquid.