JPH06218357A - Oil-containing wastewater treatment apparatus of evaporating system - Google Patents

Abstract

PURPOSE:To provide an oil-containing wastewater treatment apparatus whose installation cost is low and which does not emit harmful or malodorous gases. CONSTITUTION:An evaporation pot 11 is installed on a heating furnace 1. The evaporation pot is composed of an evaporating dish 13 and a hood 15 to cover the dish. Wastewater in a wastewater tank 9 is sent to the evaporating dish 13 by pressure through a pipe 17 to keep the surface level of the wastewater almost constant. A plurality of combustion deodorizing cylinders 19 are installed at the tip of the hood 15 and these cylinders are projected into a flue 5 of the hood 15. Each of the combustion deodorizing cylinders 19 is a cylinder having a plurality of holes 21 in the circumferential face. An air preheater 23 is set at the base of a chimney 7 and outside air heated by the waste gas flowing in the chimney 7 is sent to the hood 15 by a ventilating fan 25. An oil skimmer is attached to the evaporation pot 11 and oil is recovered continuously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment device for oily wastewater discharged from a machine factory or the like.

[0002]

2. Description of the Related Art Although an incineration system has been widely used for the treatment of oil-containing wastewater, this system not only causes a new pollution problem by the exhaust gas but also deteriorates the furnace material in a short time. There are drawbacks.

Although there are those using an emulsion breaker and an ion exchange system, it is difficult to carry out a sufficient treatment with this alone and a large amount of cost is required for the secondary treatment. Further, the evaporation method has a problem that harmful gas and a bad odor are emitted.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an evaporative oil-containing wastewater treatment device which does not emit harmful gas or odor and is inexpensive in equipment cost.

[0005]

In the evaporation type oil-containing wastewater treatment apparatus of the present invention, an evaporation pot for storing wastewater is placed on a heating furnace. An incinerator / deodorizer tube having a plurality of holes on its peripheral surface is installed in the smoke path of the heating furnace, and this combustion / deodorizer tube is communicated with the upper space of the evaporator. In addition, an oil skimmer that collects oil from the wastewater of the evaporator will be installed.

[0006]

Function: The waste water in the evaporator is heated in the heating furnace, and the water evaporates and reaches the combustion deodorizing cylinder. The combustion deodorizing cylinder is located in the smoke path of the heating furnace and has a high temperature, and when the steam passes therethrough, the foreign matter contained therein is burned and decomposed. Thus, the water vapor deodorized and the toxic gas removed is released to the atmosphere. The oil skimmer collects oil from the wastewater in the evaporation tank.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 is a heavy oil-fired heating furnace, 3 is an oil burner, 5 is a smoke path, and 7 is a chimney. A waste water tank 9 is provided in contact with the smoke path 7, and the waste water in the tank is preheated by exhaust gas.

An evaporation pot 11 is installed on the heating furnace 1. The evaporation pot 11 includes an evaporation dish 13 and a hood 1 covering the evaporation pan 13.
It consists of 5. The waste water in the waste water tank 9 is pressure-fed to the evaporating dish 13 through a pipe 17 (a pump is not shown) to maintain a substantially constant liquid level. A plurality of combustion deodorizing cylinders 19 are attached to the tip of the hood 15, and these cylinders project into the smoke path 5 of the heating furnace. As shown in FIG. 3, each combustion deodorizing cylinder 19 is a cylinder having a plurality of holes 21 on its peripheral surface.

At the base of the chimney 7 is an air preheater 23,
The outside air warmed by the exhaust gas passing through the chimney 7 is the fan 2
It is sent into the hood 15 at 5. Reference numeral 27 is an oil skimmer. In this system, a lipophilic endless belt is rotationally driven to adsorb the floating oil in the waste liquid in the evaporation dish, and the oil is continuously collected by squeezing the oil. Reference numeral 33 is a safety valve.

In this apparatus, the waste water 29 in the evaporation pot 11 is heated in the heating furnace 1 and the water is evaporated from the waste water. The air warmed by the air preheater 23 is sent to the evaporator by the fan 25, and steam is combusted with the air to burn and deodorize the cylinder 19.
Flows toward.

By the way, the combustion deodorizing cylinder 19 projects into the smoke path 5 of the heating furnace and has a high temperature of about 700.degree.
Therefore, when the water vapor passes through this cylinder, the impurities contained therein are burned and decomposed. In this way, the harmful gas and the steam free from the bad smell are discharged to the atmosphere through the chimney 7.

As the water content evaporates, the oil content of the waste liquid in the evaporating dish becomes thicker.
It collects in 7 and collects in the waste oil tank 31.

[0013]

As described above, the present invention has the following effects. In the apparatus according to the first aspect, the impurities contained in the water vapor are exposed to a high temperature in the combustion deodorizing cylinder, and are burned and decomposed. Therefore, no harmful gas or odor is left in the steam released to the atmosphere. Further, the oil remaining in the evaporator can be continuously collected by the oil skimmer, so that the waste liquid can be continuously treated.

In the apparatus according to the second aspect, since the warm air is introduced, it is difficult for the evaporator to cool, and therefore, not only the thermal efficiency is good, but also the vapor does not touch the hood of the evaporator and condense.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of the device of the present invention.

FIG. 2 is likewise a transverse cross-sectional view of the central portion.

FIG. 3 is a perspective view of a combustion deodorizing cylinder.

[Explanation of symbols]

 1 Heating Furnace 5 Flume 11 Evaporator 19 Combustion Deodorizing Tube 21 Hole 27 Oil Skimmer

Claims (2)

[Claims] 1. A heating furnace (1), an evaporation tank (11) placed on the heating furnace for storing waste water, and an upper space of the evaporation tank communicate with each other, and a smoke path of the heating furnace. An incineration deodorizing cylinder (1) installed in (5) and having a plurality of holes (21) in its peripheral surface.
An evaporation type oil-containing wastewater treatment device comprising 9) and an oil skimmer (27) that collects oil from the wastewater of the evaporation tank. 2. The evaporative oil-containing wastewater treatment device according to claim 1, wherein the exhaust gas of the heating furnace warms the air and the warm air is supplied to bring the inside of the evaporation tank to a positive pressure.