Water treatment apparatus and method of use
Apparatus for treating water has a container having a clarification zone, a water entry arrangement for flowing water into the clarification zone, and water exit units mounted to the container for at least partial immersion in the water in the clarification zone. Each water exit unit has a transfer channel for transferring a flow of clarified water from a layer of the water to a predetermined depth in the clarification zone and to direct the received clarified water to a water exit arrangement. A height adjustment mechanism is used for differentially adjusting the heights of the water exit units and their transfer channels relative to the container so as to compensate for any angular tilt of the container owing to the container being deployed on sloping ground.
1. Apparatus for treating water comprising:
a container,
a water inlet arrangement having a plurality of water inlet holes positioned along the length thereof for water entry into the container at positions along said length, the water inlet arrangement operable to cause flows of water through the water inlet holes and into the container having the same flow rate along the length of the water inlet arrangement,
a plurality of water exit units positioned along the length of the container, the water exit units having respective outlet orifices at least partially immersed in water contained in the container and positioned along the container length for enabling water outlet from the container at positions along the container length, each one of said plurality of water exit units having
a generally horizontal pipe extending along a longitudinal axis that is transverse to the container length and in a plane perpendicular to the container depth,
said horizontal pipe terminating at a first longitudinal end at a first orifice and at a second longitudinal end at a second orifice of like geometry to said first orifice, each of said first and second orifices configured to draw off water from said container, and
a common outlet intermediate between said first orifice and said second orifice, said common outlet draining liquid from said horizontal pipe,
wherein respective parts of each of said first and second orifices define a lower boundary of a common layer of the water drawn into said water exit units from said container, and wherein respective second parts of each of said first and second orifices define an upper boundary of said common layer of the water drawn into said water exit units from said container,
a clarification zone intermediate the water inlet arrangement and the water exit units,
wherein the water inlet holes and the outlet orifices are positioned to cause a gravity induced, balanced, even flow of water across the container from the water inlet ports, through the clarification zone to the outlet orifices,
each of the water exit units having a respective height adjustment mechanism for differentially adjusting heights of certain ones of the water exit units relative to other of the water exit units whereby to maintain said balanced, even flow regardless of tilt of the container.
2. The apparatus as claimed in claim 1 , wherein the height adjustment mechanism is a screw mechanism.
3. The apparatus as claimed in claim 1 , wherein the height adjustment mechanism is an angular rotation mechanism.
4. The apparatus as claimed in claim 1 , wherein said plurality of water exit units further comprise:
generally downwardly extending pipes contiguous with and coupled to respective ones of the generally horizontally extending pipes at said common outlet between said first and second orifices and configured to receive said water drawn from said container through said first and second orifices;
second horizontally extending pipe sections defining a longitudinal axis parallel to and offset from said horizontal pipe longitudinal axis; and
a pivotal coupling configured to allow manual rotation of respective ones of said horizontal pipes and said generally downwardly extending pipes about respective ones of said second horizontally extending pipe sections longitudinal axis.
5. The apparatus as claimed in claim 1 , further comprising an outlet trough to receive the clarified water from the water exit units.
6. The apparatus claimed in claim 1 , wherein the water exit units includes respective vent pipes for preventing siphoning of water through the water exit units.
7. The apparatus claimed in claim 1 , wherein the water exit units are mounted to the container.
8. The apparatus as claimed in claim 1 , wherein said plurality of water exit units are linearly arranged along said length of the container parallel with a base of said container and draw evenly from a common layer of water as water is drawn through the apparatus.