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Apparatus for increasing the pH of waste water
| Details |
Inventors: King, Earle Cochran;
Assignee: Mine Safety Appliances Company (Pittsburgh, PA)
Primary Examiner: Adee; John
Assistant Examiner:
Attorney, Agent or Firm: Brown, Flick & Peckham
Lime from a hopper is fed to a lime slurry tank by a variable speed feeder, the tank receiving water from a conduit in which there is a throttle valve and a flowmeter. Slurry from the tank is delivered to a mixing tank that has an inlet for untreated waste water and an outlet for treated waste water. A sensor responsive to the pH of treated waste water leaving the mixing tank controls a device for operating the throttle valve, and the flowmeter controls a device for operating the lime feeder to keep the concentration in the slurry tank substantially constant regardless of the rate of flow out of that tank. |
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DETAILED DESCRIPTION I claim: 1.
Apparatus for increasing the pH of waste water, comprising a lime water having an outlet, a lime slurry tank having an inlet for water and an overflow outlet, a conduit for delivering water to said slurry tank inlet, a throttle valve in said conduit, a flowmeter in the conduit for measuring the rate of flow therethrough, variable feed means for feeding lime from said hopper outlet to said slurry tank, a mixing tank having an inlet for untreated waste water and an outlet for treated waste water, said mixing tank being positioned to receive slurry from said overflow outlet to mix with waste water in the mixing tank, a sensor responsive to the pH of treated waste water leaving the mixing tank, means controlled by said sensor for operating said throttle valve, and means controlled by the flowmeter for operating said variable feed means to keep the concentration in said slurry tank substantially constant regardless of the rate of flow out of that tank.
Description:
There are situations in which it is desirable to treat waste water in order to increase its Ph and to hold it at a predetermined value.
For example, it is desirable to neutralize acid mine drainage in this way.
That has been done before, but the apparatus used for the purpose has been unduly expensive and complicated and subject to malfunctioning.
It is among the objects of this invention to provide apparatus to increase the pH of waste water, which is relatively simple in design, which makes use of standard elements that can be purchased on the market, which avoids pumping and throttling a lime slurry, and which eliminates a number of elements that previously were necessary for such apparatus.
The invention is illustrated in the accompanying drawings, in which FIG.
1 is a side view with parts broken away in section; FIG.
2 is an enlarged fragmentary side view; and FIG.
3 is a diagram of the apparatus.
Referring to FIGS.
1 and 2 of the drawings, a bin or hopper 1 of any desired size is provided for storing lime
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Liquid Purification 
