JPS5944084B2 - Metal-containing wastewater treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides that, before discharging wastewater containing heavy metals such as mercury,
The present invention relates to a treatment device for metal-containing wastewater that effectively removes heavy metals from wastewater.

Conventional methods for removing heavy metals when draining wastewater containing heavy metals such as mercury include adding chemicals to the wastewater to convert the heavy metals into compounds, adsorbing the heavy metals on activated carbon or ion exchange resin, and using flocculants. There are methods to precipitate heavy metals, but in either case, the treatment function is easily influenced by the pH of the wastewater, the concentration of heavy metals, and its physical or chemical properties, so this treatment requires complicated operations and high temperatures. Since it requires management and control of pH, etc., installation of this processing equipment requires a considerable amount of cost. Not only does it put a considerable burden on hospitals to install such equipment in one hospital, but in reality, even if the heavy metals contained in wastewater can be removed, the heavy metals in the wastewater still contain the most harmful mercury vapor generated during amalgam processing. The disadvantage was that it could not be processed.

The purpose of the present invention is to effectively precipitate and recover heavy metals from wastewater containing heavy metals such as mercury, drain only the supernatant in which the heavy metals have been precipitated, and also remove the air containing mercury vapor surrounding the wastewater source from the wastewater source. The object of the present invention is to eliminate the above-mentioned drawbacks of the conventional methods by providing a treatment device for metal-containing sewage that can be suctioned and removed from metal-containing wastewater.

Next, the configuration of an embodiment of the present invention will be explained with reference to the drawings.

Examples of sources of metal-containing sewage include the pipe shown in Fig. 1, flexible flexible mouth 1, vacuum tip 2,
One or more dental units 5 equipped with a vacuum cup 3, a floor cleaning attachment 4, and an air intake port 6 made of wire mesh for storage or processing of the amalgam, as well as an activated carbon filter 7 for adsorbing mercury vapor. An airtight body container 14 of the sewage treatment equipment 13 is connected to an amalgam container 9 containing water 8 to prevent heavy metals from scattering to the outside, and is connected to each solenoid valve 10, 11 through a pipe 12. A blower 15 is attached to create a negative pressure inside the container 14, and the air inside the container 14 containing mercury vapor passes through an activated carbon filter 16 attached to the upper part of the inside of the container 14, a blower 15, and an activated carbon filter 17 for exhaust to remove mercury vapor. It is discharged into the atmosphere in a contaminated state.

A first sedimentation tank 18 is installed in the main body container 14 formed in this way, into which metal-containing sewage from a sewage generation source flows through the pipe 12, and a removable sedimentation tank 18 is installed in the first sedimentation tank 18. A wire mesh filter 19 and a supernatant reservoir container 20, that is, a supernatant reservoir having an air release hole 21 formed in the upper part of the hollow container and a large number of small holes 22 formed throughout the bottom surface which is formed in a circular shape protruding inside. The container 20 is attached, and the sewage flowing out from the pipe 12 hits the diffusion plate 23 attached above the air vent hole 21 of the supernatant reservoir container 20 and flows into the first settling tank 1.
At the same time, it is diffused to the inner periphery of the first settling tank 18, flowing down naturally at a reduced speed through the wire mesh filter 19, the outer periphery of the supernatant tank 20, and the inner periphery of the first settling tank 18, and the slope around the bottom of the first settling tank 18. As the water level of the sewage in the first settling tank 18 rises, the supernatant of the sewage in the first settling tank 18 flows from /J-fL22 into the depression 24 at the center of the first settling tank 18. Supernatant reservoir container 2 so that it protrudes
Flows into 0.

In addition, the depression 24 of the first settling tank 18 is connected to the pump 25 and the solenoid valve 2.
6. communicates with a sealed second settling tank 28 via piping 27;
The wastewater accumulated in the first settling tank 18 is supplied to the second settling tank 28 from the depression 24, and the air in the second settling tank 28 is discharged into the atmosphere through the exhaust activated carbon filter 17. The sewage supernatant in the tank 18 and the second settling tank 28 above a certain water level is drained from a drain pipe 33 to a sewer (not shown) etc. via a solenoid valve 29, a check valve 30, a pump 31 and a solenoid valve 32, respectively, Concentrated and settled wastewater accumulated at the bottom of the sedimentation tank 28 can be taken out to a filter or capsule (not shown) through a valve 34, and a supernatant storage container 20 and a first sedimentation tank 18 are provided at the upper part of the main body container 14. A fresh water supply piping 35 is installed to supply clean water for diluting sewage to the first settling tank 18 while flushing the sewage distribution section, and a pressure reducing valve 36 and a solenoid valve 37 for controlling fresh water are installed in the middle of the piping 35. Sulfur 38 for storing mercury precipitation is attached to the outer bottom surface of the storage container 20 and inside the second settling tank 28, and the supernatant storage container 20 and the second settling tank 28 are
The settling tank 28 is equipped with water level detection switches SWI, SW2 and SW3 which operate according to each level of wastewater.

Next, the operation of this embodiment will be explained according to the electric circuit shown in FIG.

First, in a state where sewage is not accumulated in both the first settling tank 18 and the second settling tank 28, the water level detection switch SWI
, SW2 is off, and SW3 remains on at water level H3. In this state, for example, when main switch SW4 is turned on in response to the start of medical treatment in the morning, relay RLI is activated and its normally open contact RL1a1 is turned on. Even relay RL2
．． Since the normally open contacts RL2a1 and RL3a1 of Rb2 are both off, relay RL3 does not operate.

Next, when the medical treatment is started in this state, the doctor's manual operation is automatically performed by the function of the equipment, and the operation switches 5W6-1, 5W6-2, . . .
, 5W6-n is turned on, each switch SW6
In addition to operating the solenoid valve 10 or 11 of the dental unit 50 corresponding to the required instruments 1 to 4 or the amalgam container 9, the electromagnetic switch MC is operated by the operation of the relay RL4 via the transformer TR, and the blower 15 is operated. Drive motor M
rotates.

Therefore, the air around the sewage generation source corresponding to the operation switch SW6 is sucked into the main container 14 through the pipe 12, and the sucked air causes the mercury vapor contained in the air to be adsorbed on the activated carbon filters 16 and 17. Sewage such as water from dental treatment that is released into the atmosphere during amalgam processing and contains heavy metals is also sucked into the main container 14 through the pipe 12 and flows into the first settling tank 18, as well as coarse processing waste. remains on the wire mesh filter 19, and the wire mesh filter 19
The heavy metal-containing wastewater that has passed through is collected in the depression 24 of the first settling tank 18.
flows into.

In this way, as the water level of the sewage in the first sedimentation tank 18 rises, the metal powder contained in the sewage gradually settles and collects from the bottom slope of the first sedimentation tank 18 into the depression 24, and the sewage is removed from the supernatant. The supernatant flows into the supernatant reservoir container 20 through the small hole 22 while the bottom surface of the reservoir container 20 prevents the metal powder from flowing in the direction of precipitation. The metal powder contained in the supernatant tank 20 is precipitated and fallen from the inclined bottom surface of the supernatant tank 20 through the small holes 22 on the outer periphery of the bottom surface, and is then deposited in the first settling tank 1.
When the wastewater is collected in the depression 24 of No. 8 and the water level in the settling tank No. 18 reaches the H1 position, the water level detection switch S is activated.
When W2 is turned on, relay RL2 is activated, and switch SW3 and relay contacts RL1al and RL2al are turned on at H3 position.
Relay RL3 is activated via.

As a result, the pump 2
5 and the electromagnetic valve 26 are activated, and the sewage with high concentration of metals accumulated at the bottom of the first settling tank 18 flows into the second settling tank 28, and the water level of the sewage in the settling tank 28 reaches H4. Relay R is turned on when H4 side of detection switch SW3 is on.
In addition to turning off the pump 25 and solenoid valve 26 together with L3, the first
The water level of the sewage in the settling tank 18 rises again, and when the water level reaches the H1 position, the water level detection switch SW2 is turned on again. Since the switch SW3 is switched to the H4 side, the relay RL3 is not activated, and the water level of the sewage in the first settling tank 18 further rises.

In this way, when the water level of the sewage in the first settling tank 18 reaches the H2 position and the water level detection switch SW1 is turned on, the relay contact RL2a2. RL3b1.

Relay RL5 is self-holding activated via RL5al, and its normally open contacts RL5a2. Pump 29 via RL5a3
, the solenoid valve 37, and the timer TM are activated, and the pilot lamp PL installed in the clinic, etc., for indicating drainage is lit.
The supernatant of the sewage in the first settling tank 18 is drained diluted with fresh water, and the supply of fresh water is stopped by turning off the timer contact TMb 1 due to the timer up corresponding to the end of washing, and Clear drainage is stopped by turning off relay RL2 when the water level of the sewage in the first settling tank 18 reaches the H1 position and turning off the water level detection switch SW2, and by turning off relay RL5 via its contact RL2a2. At the same time, when the water level of the sewage in the first settling tank 18 reaches the H2 position, the draining operation is repeated again.

At the end of the day's medical treatment in this way, the precipitation of heavy metals in the sewage in the second sedimentation tank 28 has almost completely finished, and when the main switch SW4 is turned off at the end of the medical treatment, the relay RL1 is turned off. By turning off its contact RL1b1, relay RL6 is turned on.
is activated and the pump 31 via its contact RL6a1
The sewage supernatant in the second sedimentation tank 28 is drained by the operation of the electromagnetic valve 32, and when the water level of the sewage in the second sedimentation tank 28 reaches the H3 position, the water level detection switch SW3 is switched to the H3 side, and the water level is turned off together with the relay RL6. pump 31
The solenoid valve 32 is also turned off, and all operations of the sewage treatment device 13 are stopped.

Next, when the morning medical treatment starts, the main switch SW4 is turned on again.
When the water level detection switch SW3 is turned on, the water level detection switch SW3 is switched to the H3 side, so at the time the water level detection switch SW2 is turned on, the precipitation has almost completely finished and the high concentration metal content accumulated in the depression 24 is removed. As the sewage flows into the second settling tank 28, the operation of the sewage treatment device 13 is repeated again, and the concentration of metals contained in the sewage at the bottom of the second settling tank 28 increases day by day. The high-concentration wastewater contained therein can be easily collected into a filter, capsule, etc. by operating the pulp 34.

Next, the effects of the present invention will be explained.

The present invention includes a first settling tank that communicates with a metal-containing sewage generation source to allow metal-containing sewage from the same source to flow in, and sucks air around the metal-containing sewage source via a negative pressure device;
An air vent hole is formed in the upper part of the hollow container, and a plurality of holes are formed in the bottom surface of the hollow container. A supernatant reservoir container in which the sewage supernatant flows into the hollow container from a small hole in the bottom as the water level of the sewage in the first sedimentation tank rises, and a preset amount of sewage in the supernatant reservoir container. Pour a certain amount of wastewater into the supernatant tank with the
A first drainage device that drains water to the outside while being diluted with fresh water supplied through the lower surface of the sewage flow in the sedimentation tank; a second sedimentation tank that drains metal-containing sewage accumulated at the bottom of the first sedimentation tank; A treatment device for metal-containing sewage comprising: a second drainage device that drains a certain amount of supernatant in the second sedimentation tank to the outside at each lapse of time corresponding to the completion of the settling action of the metal-containing sewage in the second sedimentation tank; It is in.

As a result, the present invention effectively precipitates and recovers heavy metals from wastewater containing heavy metals such as mercury, drains only the supernatant in which the heavy metals have been precipitated, and also removes air containing mercury vapor around the source of the wastewater. This has the effect of suctioning and removing sewage from the source.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the whole of one embodiment of the present invention, FIG. 2 is a detailed explanatory diagram of the main part thereof, and FIG. 3 is an electric circuit diagram thereof. 5... Dental unit, 9... Amalgam container, 10.11.26, 29, 32, 37...
...Solenoid valve, 12.27,35...Piping, 1
3...Sewage treatment equipment, 14...Main container, 15...Blower, 18...First settling tank, 20...Top Clearing container, 21...
Air vent hole, 22... Small hole, 25, 31...
...Pump, 28...Second sedimentation tank.

Claims (1)

[Claims] 1. A first sedimentation tank that communicates with a metal-containing sewage source to allow metal-containing sewage from the source to flow in and sucks air around the metal-containing sewage source via a negative pressure device, and an upper part of a hollow container. An air vent hole is formed in the bottom surface, and a plurality of cylindrical holes are formed in the bottom surface, and the wastewater from the metal-containing sewage generation source is diffused and flowed down to the periphery of the first sedimentation tank while installed in the first sedimentation tank. At the same time, as the water level of the sewage in the first sedimentation tank rises, the sewage supernatant flows into the hollow container from the small hole in the bottom of the supernatant container, and the sewage in the supernatant container is set in advance.
a first drainage device that drains a certain amount of sewage in the supernatant reservoir container to the outside while diluting it with fresh water supplied through the lower surface of the sewage flow into the first settling tank; and a bottom part of the first settling tank. a second sedimentation tank into which metal-containing wastewater accumulated in the tank flows;
and a second drainage device that drains a certain amount of supernatant in the second settling tank to the outside every time corresponding to the end of the settling action of the metal-containing sewage in the settling tank. processing equipment.