Device for treatment of wastewater

A device for the treatment of sewage comprising a vessel partitioned into a upper chamber and a lower chamber, said lower chamber having a gas retaining space and a liquid retaining space, a feed conduit and nozzle permitting flow of sewage into said lower chamber by gravity, the upper chamber having a liquid retaining space and at least part of its liquid retaining volume at an elevation above the said lower chamber, at least one buoyant bed filter, in a suitable housing, removable from the vessel without spillage of the contents of the vessel, fluid communication between the lower chamber and the upper chamber being restricted to liquid communication between the liquid retaining space in the lower chamber and the upper chamber exclusively through the buoyant bed filter, a return conduit extending vertically from the lower chamber to the outside terminating at a elevation well above the highest level of fluid in the device, and being of sufficient extent at its lower end to form a liquid seal in liquid contents of the lower chamber, a automatic gas release conduit, having a substantially vertical descending leg and an ascending leg, the ascending leg opening at its upper end into the return conduit at an elevation above the highest level of liquid in the device, the descending leg opening into the lower chamber at a suitable elevation, the gas release conduit assembly being oriented so that the direction of fluid flow entering from the lower chamber being downwards in the descending leg and upwards in the ascending leg, a secondary gas release conduit extending vertically from the gas retaining portion of the lower chamber and opening into the return conduit at an elevation well above the highest level of liquid in the device, a valve device to enable gas tight shutoff and opening of the secondary gas release conduit, and an outlet nozzle in said upper chamber for the output of treated wastewater.

A device for the treatment of sewage comprising a collection tank for collecting by gravity flow sewage and wastes, a nozzle in the collection tank for discharge of wastes, a level sensing device in the collection tank, a conduit connecting the collection tank to a lower chamber, at an elevation below the floor of the collection tank, said lower chamber having a gas retaining space and a liquid retaining space, a feed conduit permitting flow of sewage into the said lower chamber by gravity, a one-way valve in the feed conduit, preventing the back flow of liquid from the lower chamber to the collection tank, an upper chamber having a liquid retaining space and a gas retaining space, and having at least part of its liquid retaining volume at an elevation above the said lower chamber, at least one filter installation chamber extending vertically from the lower chamber to the outside at an elevation above the highest liquid level in the device, a gas tight lid for the filter installation chamber, a conduit establishing fluid communication between the said filter installation chamber and the upper chamber, at least one filter module having a elongated housing partly filled with a buoyant particulate media, the housing having perforations at both its ends, allowing the flow of fluid through the module but retaining the buoyant particulate media, at least one filter module installed vertically in the filter installation chamber, with a fluid impermeable seal preventing fluid communication between the filter installation chamber and the lower chamber except through the filter module, the filter module being of sufficient length so that perforations at its lower end are at all times immersed in a liquid retaining part of lower chamber, forming a liquid seal preventing entry of gas from the gas retaining space while liquid communication is established from the lower chamber to the upper chamber through the filter module, a return conduit extending vertically from the lower chamber to the outside terminating an elevation well above the highest level of fluid in the device, and being of sufficient extent at its lower end to a form liquid seal in liquid contents of the lower chamber, an automatic gas release conduit, having a substantially vertical descending leg and an ascending leg, the ascending leg opening at its upper end into the return conduit at an elevation above the highest level of liquid in the device, the descending leg opening into the lower chamber at a suitable elevation, the gas release conduit assembly being oriented so that the direction of fluid flow entering from the lower chamber being downwards in the descending leg and upwards in the ascending leg, a secondary gas release conduit extending vertically from the gas retaining portion of the lower chamber and opening into the return conduit at an elevation well above the highest level of liquid in the device, an automatic valve device to enable gas tight shutoff and opening of the secondary gas release conduit, when receiving a signal from the level sensing device in the collection tank, a tank at an elevation above the collection tank containing material with aerobic biofilm, a primary outlet conduit for conveying and discharging contents from the upper chamber to the tank containing aerobic biofilm, a secondary outlet conduit at a level below the floor of the collection tank for gravity overflow discharge of liquor from the secondary chamber, a automatic valve device in the secondary outlet conduit that can be operated by a remote signal, a timer device capable of activating the said automatic valve device in the secondary outlet conduit when the collection tank contains more than a predetermined quantity of waste for a predetermined length of time.

A device for the biological treatment of wastewater containing biodegradable solids comprising:

• a vertically oriented elongated vessel partitioned by an impermeable substantially horizontal wall into a top chamber and a bottom chamber, each chamber being provided with a gas retention space and a liquid retention space:
• a nozzle establishing fluid communication between the bottom chamber and the outside of the vessel for input of wastewater into the vessel;
• a nozzle establishing fluid communication between the liquid retention space of the top chamber with the outside of the vessel for discharge of treated wastewater from the vessel, and arranged so as to retain a level of liquid within the top chamber;
• a nozzle for discharge of gas from the gas retention space of the top chamber;
• at least one filter chamber having at least one inlet communicating fluidly with the liquid retaining space in the bottom chamber, and at least one outlet communicating fluidly with the liquid retaining space of the top chamber;
• a filter bed placed within the at least one filter chamber and partly filling an internal volume of the at least one fluid chamber;
• at least one gas conduit establishing fluid communication between the gas retention space in the lower chamber with the gas retention space in the upper chamber;
• and a discharge means enabling periodic discharge and stoppage of flow of gas through the at least one gas conduit.