Liquid purification or separation – With means to add treating material – Directly applied to separator
Patent
1994-08-03
1996-12-03
Upton, Christopher
Liquid purification or separation
With means to add treating material
Directly applied to separator
210236, 210238, 2101954, C02F 320
Patent
active
055804497
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to sewage treatment apparatus, especially but not exclusively for the treatment of domestic sewage.
Hitherto, one construction of such apparatus, referred to as a septic tank, comprises a tank having an inlet and an outlet, and baffles through which fluid passes in order to flow from the inlet to the outlet. The baffles effect a separation between solids and liquids of the influent. The solids are broken down by micro-organisms within the tank, to create a sludge which is removed regularly by a suction tanker.
Another previously proposed construction comprises a rotary drum filter which separates solids from liquids in the influent.
In both these previously proposed forms of construction, installation costs and time are relatively high, as are the frequency, cost and time involved in subsequently servicing such apparatus. Furthermore, the reduction in the pollutants in the effluent, as compared with those contained in the influent, may be considered inadequate.
A first aspect of the present invention seeks to obviate one or more of the foregoing disadvantages.
Accordingly a first aspect of the present invention is directed to sewage treatment apparatus comprising a tank, aeration means which serve to aerate a biomass contained within the tank when the apparatus is in use, and air compressor means which are connected to the aeration means to deliver air thereto, in which the air compressor means are in a housing that forms a barrier between the housing interior and the tank interior, to inhibit transfer of gas or other material from the tank interior to the housing interior.
It is desirable for the compressor to be readily removable for servicing. To this end it may be mounted on a separate panel which itself is readily removable from the compartment. For example, the support panel may have edges which slidingly engaged formations within the compartment. These formations may be in the form of studs or other projecting portions projecting from one or more interior walls of the compartment.
The compartment itself may be provided with a servicing cover.
Furthermore the compartment itself is held within the tank, at an upper level thereof. This protects the compartment from exposure and vandalism, and stabilises its temperature.
In the event that the dimensions of the panel and the dimensions of the cover require a rotation of the panel before it is slid outwardly from the compartment, slots or recesses may be formed in an edge of the panel to enable the latter to be swung clear of such projections after the panel has been slightly raised.
Connecting lines between parts mounted on the support panel and other parts within the compartment can be ducted through an umbilical cord to enable the support panel to be removed from the compartment without those lines being disconnected.
The compartment may be so constructed that it is suspended from the rim around the opening in the top of the tank. Further, the compartment incorporates the support panel and the compressor, and possibly certain other apparatus, to create a modular unit. This enables easy installation comprising the steps of digging a hole in the ground to receive the tank, securing the tank in the hole thus dug, and subsequently lowering the compartment through the opening in the upper wall of the tank until a rim of the compartment is supported on a rim of the tank.
An electrical control unit may also be mounted on the support panel.
The present invention may be embodied in sewage treatment apparatus comprising a tank, at least one electrical-power consuming device which is in the tank and which is required for the operation of the apparatus, an electrical input to enable electrical power to be supplied to the said device, and signal generator means which are connected directly or indirectly to the said device, which are constructed to provide a signal indicative of the condition of the said device, and which are connected to the said electrical input to superimpose that signal on the electrical power supply, whereby the co
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