JP2010221166A - Sewage treatment apparatus for ship - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewage treatment apparatus for ships, which improves water quality performance and prevents secondary contamination by residual chlorine accompanying toughening of regulation of discharge of sewage such as feces and urine from ships, and is capable of being loaded even in a limited space inside a ship. <P>SOLUTION: In the sewage treatment apparatus for ships, a contact material 2 and a filter membrane 3 are immersed in the same tank (hereafter, called a membrane separation/contact oxidation tank 1), and scrubbing of the filter membrane and aeration of the contact material are performed with the same air. Also, on the treated water discharge line of the post-stage of the membrane separation/contact oxidation tank, a disinfectant dissolving device 5 and a disinfecting and backwashing tank 6 in which the residence time is about 15 minutes are provided via a suction pump 4. Also, on the treated water discharge line and a backwashing line branched from the disinfecting and backwashing tank, an automatic valve and a constant flow valve for controlling a filtration water amount and a filter membrane backwashing water amount respectively are provided. Further, the membrane separation/contact oxidation tank is provided with a liquid surface control means, and after the discharge of the treated water is completed, a timer is set and backwashing is performed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a marine sewage treatment apparatus using a membrane separation contact oxidation method in which biofilm treatment with a contact material and filtration with a filtration membrane (MF membrane) are simultaneously performed in the same tank.

Conventionally, as a sewage treatment system for ships, the all-contact oxidation method (a structure consisting of only a contact oxidation chamber and a disinfection chamber and no sedimentation chamber) has become the mainstream, taking advantage of its compactness, short acclimatization period and easy maintenance and inspection. ing.

However, as the regulation of manure discharge from ships increases, BOD removal can be dealt with by increasing the area of the contact material, but the suspended matter (SS) such as biofilm peeled off from the contact material must ensure the standard value. Has become difficult.

In addition, since there is no mechanism to maintain quantitativeness in the sewage flowing into the disinfecting medicine cylinder, excessive dissolution or insufficient dissolution occurred, making it difficult to secure stable residual chlorine (0.5 mg / L or less).

The present invention has been made to solve the problems involved, and in addition to the conventional functions, it is possible to achieve high performance with uniform residual chlorine concentration and energy saving. The purpose is to save labor.

The present invention has been made in view of the above problems, and the invention according to claim 1 immerses the contact material and the filtration membrane (MF membrane) in the same tank, shares the air of scrubbing the MF membrane with the aeration of the contact material, and The treatment water discharge line after the membrane separation contact oxidation tank is equipped with a disinfectant dissolver and a disinfection / backwash tank with a residence time of about 15 minutes via a suction pump, and branches from the treatment water discharge line and the disinfection / backwash tank. Each of the backwash lines is provided with an automatic valve and a constant flow valve for controlling the filtrate water amount and the membrane backwash water amount, respectively.

Further, the invention described in claim 2 of the present invention is characterized in that a liquid level control means is provided in the membrane separation contact oxidation tank, and the set time of the timed timer is backwashed every time the treated water is discharged.

According to the first aspect of the present invention, the MF membrane is immersed in the center of the membrane separation contact oxidation tank, the contact material is immersed so as to surround the outer periphery thereof, and the scrubbing air of the MF membrane is used as the contact material. By sharing with aeration, the amount of air can be saved, and the output of the aeration blower is reduced, saving energy.

In addition, a disinfectant dissolver and a disinfection and backwash tank with a residence time of about 15 minutes are installed in the treated water discharge line after the membrane separation contact oxidation tank via a suction pump. In general, porous membranes made of porous organic polymers fluctuate in the amount of permeated water due to the effect of water viscosity. By providing a constant flow valve that controls the amount of filtration membrane backwash water respectively, the amount of filtrate water (flow rate) becomes constant and the disinfection and sterilization effect can be ensured uniformly. Furthermore, by providing the filter membrane backwash water with a quantitative property, a stable backwash effect can be expected.

According to the invention described in claim 2 of the present invention, the liquid level control means is provided in the membrane separation contact oxidation tank, and the set time of the timed timer, automatic backwashing and automatic air scrubbing are performed every time the treated water discharge is completed. As a result, the filtration capacity can be extended and the number of manual chemical cleaning operations can be reduced, leading to labor saving.

The details of the present invention will be described below according to the best mode for carrying out the present invention with reference to the drawings.

FIG. 1 is a structure and piping system diagram showing an embodiment of the present invention. FIG. 2 is an operation timing chart of the present invention.

The embodiment of the present invention purifies the manure W1 generated in the ship, soaks the filtration membrane (MF membrane) 3 in the center of the membrane separation contact oxidation tank 1, and the contact material 2 so as to surround the outer periphery thereof. Immerse.

Air from the aeration blower 8 is blown from the lower part of the MF membrane 3 through the automatic valve V5. While scrubbing the surface of the MF membrane 3, this air dissolves in the sewage and becomes dissolved oxygen to give oxygen to the biofilm on the surface of the contact material 2. Further, the solid matter on the screen 9 is crushed by the circulating force.

The treated water discharge line downstream of the membrane separation contact oxidation tank 1 has a suction pump 4 via an automatic valve V1 and a constant flow valve FC1, and the liquid level control means loaded in the membrane separation contact oxidation tank 1 (with a built-in timer) In response to the signal 7, the suction pump 4 repeats automatic start / stop.

A disinfectant dissolver 5 and a disinfection and backwash tank 6 with a residence time of about 15 minutes are provided at the subsequent stage of the suction pump 4 through an automatic valve V2. It flows into the dissolver 5, dissolves the solid disinfectant quantitatively, and is completely sterilized while passing through the disinfection and backwash tank 6 for about 15 minutes, and the residual chlorine concentration is discharged outside the ship within the regulation value.

The suction pump 4 is automatically activated when the liquid level control means 7 provided in the membrane separation contact oxidation tank 1 detects the upper water level, performs suction filtration until the lower water level is detected, and discharges the treated water W2 to the outside of the ship. During this time, the automatic valves V1, V2, and V5 are open and V3 and V4 are closed.

When the liquid level control means 7 detects the sewage level, the automatic valve V3.V4 is opened and V1, V2, V5 are closed, but the suction pump 4 continues to operate to determine the treated water in the disinfection and backwash tank 6. The aeration blower 8 is stopped at this time by supplying water to the filtration membrane (MF membrane) through the flow valve FC2 for a predetermined time (T1) and backwashing the membrane. When T1 times out, the suction pump 4 is stopped, the aeration blower 8 is started again, air is supplied to the filtration membrane (MF membrane) 3, and the foreign matter on the membrane surface is scraped off (air scrubbing) for a certain time (T2). After the T2 time-out, the liquid level control means 7 is prepared for restart by the water level detection signal.

This series of operation cycles is controlled by timed timers T1 and T2 and liquid level control means 7 in a separately provided control panel (not shown).

A series of these operations is shown in FIG. 2 as an operation timing chart.

The present invention can cope with the strengthening of regulations for preventing marine pollution from manure generated from a ship, and is suitable for use as a high-performance ship sewage treatment apparatus having the characteristics of space saving, energy saving and labor saving.

FIG. 1 is a structure and piping system diagram showing an embodiment of the present invention. FIG. 2 is an operation timing chart of the present invention.

W1 Raw manure water
W2 Treated water 1 Membrane separation contact oxidation tank 2 Contact material 3 Filtration membrane (MF membrane)
4 Suction pump (P1)
5 Disinfectant dissolver 6 Disinfection and backwash tank 7 Liquid level control means (with timers T1 and T2)
8 Aeration blower (B1)
9 screens
V1 automatic valve
V2 automatic valve
V3 automatic valve
V4 automatic valve
V5 automatic valve
FC1 constant flow valve
FC2 constant flow valve

Claims (2)

The contact material and the filtration membrane are immersed in the same tank (hereinafter referred to as a membrane separation contact oxidation tank), the filtration membrane scrubbing and the contact material are aerated with the same air, and the treated water discharge line downstream of the membrane separation contact oxidation tank Is equipped with a disinfectant dissolver and a disinfecting / backwash tank with a residence time of about 15 minutes via a suction pump, and an automatic valve and a filtered water amount respectively in the treated water discharge line and the backwash line branched from the disinfecting / backwash tank And a marine sewage treatment apparatus having a constant flow valve for controlling the amount of filtration membrane backwash water respectively. 2. A sewage treatment apparatus for a ship according to claim 1, wherein a liquid level control means is provided in the membrane separation contact oxidation tank, and backwashing is performed for a set time of a timed timer after completion of discharging the treated water.

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