JPS6223991A - Waste water circulation type metallic-surface treating device - Google Patents

Abstract

PURPOSE:To obtain the titled treating device attaining a completely closed system by recovering and filtering the waste water discharged from a washing zone, resupplying both the filtered water and distilled water of the concentrated water produced in this case to the washing zone and recovering sludge formed in a period of the concentration. CONSTITUTION:After feeding the overflow in the period of both water washing of the liquid tanks 5-10 and the chemical conversion treatment to a liquid tanks 15, it is fed to a filter 19 through a pipe 8 and only the filtered water is fed to the liquid tanks 5-10 via the pipes 13a-13e through a pipe 20. Still more the concentrated water incapable of filtering in the filter 19 is returned 21 to the liquid tank 15. Also when the concn. of the liquid tank 15 is risen and the filtering capacity of the filter 19 is decreased, a distillation device 24 is operated and the waste water incorporated in the liquid tank 15 is fed 22 to the device 24 through a pipe 23 and only the sludge is recovered in a tank 25. The distilled water obtained in this time is fed to the liquid tanks 5-10 via a pipe 20 and the pipes 13a-13e through a pipe 27. In this case, since the waste water of water washing polluted with a chemical liquid is reutilized and the system is closed, the water liquid treatment is not necessitated at the outside of the device and an environmental pollution treatment installation is not necessitated.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention is for degreasing, cleaning and phosphate treatment of metal surfaces.

The present invention relates to wastewater treatment such as chromate treatment and plating treatment, and particularly to a metal surface treatment device suitable for completely closed wastewater treatment.

[Background of the invention]

As described in Japanese Patent Publication No. 52-27615, the conventional device has a mechanism in which washing water contaminated with a chemical solution is naturally evaporated by spraying, and air containing moisture is discharged outside the device by a fan. The amount of washing water discharged as wastewater was completely eliminated. However, room temperature, water temperature,
Since the amount of evaporation changes depending on conditions such as the amount of spray during spraying, it is necessary to sufficiently adjust the exhaust capacity of the fan and the amount of fresh water supplied, which poses a practical problem.

[Purpose of the invention]

The purpose of the present invention is to reuse wastewater from washing water contaminated with chemical solutions, supply necessary fresh water, and collect only sludge without reducing the degree of washing of a predetermined object to be treated. The purpose of the present invention is to provide a completely closed wastewater circulation type metal surface treatment equipment.

[Summary of the invention]

A filtration device and a distillation device are installed to separate wastewater from washing water contaminated with chemicals generated from metal surface treatment equipment, collect only the sludge, reuse filtrated water and distilled water, and drain water outside the equipment. 2) This is a wastewater circulation type metal surface treatment equipment that prevents water damage.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIG. This example merely illustrates one embodiment of the present invention, and does not limit the configuration of the present invention. In this example, three water washing zones and three hot water washing zones are provided for phosphate treatment. 1 is the object to be treated, 2 is the object to be treated, 3 is a conveyor for conveying 1.2, degreasing treatment in zone 4, washing with water in zones 5 and 6, chemical conversion treatment in zone 7, washing with water in zones 8 and 9, Lubrication treatment in zone 1o,
Hot water washing is performed in zone 11. Liquid tank 4, 7, 10°11
A heater 12a for heating the chemical solution and water.

12b, 1.2c, and 12d are attached, respectively. 13a, 13b, 13c
, 1.3 d, 13 e are fresh water, liquid tank 5
, 6, 8, 9.10 pipe for supplying 1.4A,
1.4B, 14C, 14D.

14 E i:j, This is a pipe for overflowing the washing water and hot water in the liquid tanks 5, 6, 8, 9, and 10 and supplying it to the liquid tank 15. Said tube, i-3a.

13b, ] 3c, 13d, and 13e have valves 1-6 a
.

1, 6 b, 16 c, i,, 6 d, 1
．． 6 e is installed. The overflow water supplied to the liquid tank 15 is supplied to the filtration device 19 through the pipe 18 by the pump 17, and only the filtered water is passed through the pipe 20 & then through the pipes 13a, 13b, 13c, 13cl, 13e. Liquid tanks 5, 6. Supplied to R,9,10. The concentrated water that could not be filtered by the filtration device 19 is returned to the liquid tank 15 through the pipe 2]. In addition, when the concentration of the liquid tank 15 increases by 2 and the filtration capacity of the filtration device 19 decreases, the ruthless device 24 is activated and the wastewater in the liquid tank 1-5 is removed by the pump 2.
2, only the sludge supplied to the ruthless device 24 through 923 is collected into the tank 25, and the ruthless water obtained here is transferred from the pipe 27 to the pipe 20 and the pipe 13a by the pump 26.

13 b, 13 c, 1.3 d, 13
a, and is supplied to liquid tanks 5°6.8, 9, and 1.0. In addition, when the amount of water decreases due to natural evaporation of water in the liquid tanks 5 and 6, a float 28 is provided in the liquid tank 15, and fresh water is supplied from a pipe 30 using a valve 29.

According to this embodiment with such a structure, all of the waste water can be reused, and the generation of waste water due to contaminated flushing water can be completely eliminated.

Furthermore, it was confirmed that the apparatus of this example does not cause any particular difference or problem in terms of quality and performance compared to conventional apparatuses.

〔Effect of the invention〕

According to the present invention, the wastewater of flushing water contaminated with the chemical solution is reused and closed, so that wastewater treatment outside the device is unnecessary, and pollution treatment equipment is not required. For this reason, the installation location is not limited, the equipment can be installed in-line, and there are many advantages such as labor saving.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the apparatus of the present invention. DESCRIPTION OF SYMBOLS 1... Object to be processed, 2... Object to be processed, 3... Conveyor, 4-11, 15'-- Liquid tank, 12 a
~12 d - Warming heater, 13'a ~ 13e, 14
a-14e. 18, 2o, 21, 23.27.3'O... tube. 16a-16e, 29... valve, 17, 22.26...
・Pump,] 9...filtration device, 24...ruthless device,
25...Tank.

Claims (1)

[Claims] 1. A wastewater circulation type metal surface treatment equipment having a chemical treatment zone, a water cleaning zone following the treatment zone, a zone for filtering wastewater from the cleaning zone, and a sludge recovery zone, which It is characterized by comprising a means for recovering, filtering, and resupplying only the filtered water to the cleaning zone, and a means for distilling the concentrated water generated during filtration, recovering only the sludge, and supplying the distilled water again to the cleaning zone. Wastewater circulation type metal surface treatment equipment.