Retaining filter, plant and method for treating effluents
AssigneeEpcaro, Societe Anonyme
InventorsHervé Philip, Siegfried Maunoir
Life of this patent
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Abstract
A water treatment facility and method for treating effluents incorporating an input filter for removing bacterial contamination. The filter utilizes pipe and tube systems for distribution and drainage, which extend from both the inlet and outlets, which face each other at a spaced distance, and contain lengthwise perforations with filtration equipment therebetween. The water treatment apparatus utilizes a septic tank which includes a barrier, a waste water delivery pipe, an evacuation pipe for clean water, equipment for decantation of the heaviest matter at the bottom of the barrier and the surface accumulation of grease and light particles, anaerobic fermentation of the entrapped material, and protective equipment arranged to prevent plugging.
Claims35
A treatment method for domestic wastewater in which, successively:
- wastewater to be treated is passed into an all-water septic tank;
- then into a first filter able to ensure the removal of a substantial portion of organic matter;
- and finally into a second filter able to ensure the removal of a substantial portion of bacterial contamination in which the water leaving the second filter has the following bacterial levels, per ml:
- a quantity less than 1 for fecal coliforms;
- a quantity less than 1 for fecal streptococcus.
A filter for the removal of bacterial contamination of effluents with filtration equipment including
- two systems of pipes, one each respectively for distribution and drainage, located respectively at an intake and an outlet of the filter, placed mutually facing and spaced apart from each other, and containing perforations distributed lengthwise along transverse walls of said pipes;
- a filtration equipment between the two systems in the form of at least one sand bed the size distribution curve of which conforms to the range defined in AFNOR's DTU no. 64-1, Ref. P 16-603, able to ensure the removal of a substantial portion of bacterial contamination from the effluent passing through the filter and
- a distribution equipment connected with the system of distribution pipes, meant to ensure the diffusion of water to be treated toward the filtration equipment and characterized by its size between 0.2 and 0.9 m2/equivalent inhabitant.
A treatment method for domestic wastewater in which, successively:
- wastewater to be treated is passed into an all-water septic tank;
- then into a first filter able to ensure the removal of a substantial portion of organic matter;
- and finally into a second filter able to ensure the removal of a substantial portion of bacterial contamination in which the water leaving the second filter has:
- a chemical oxygen demand less than 30 mg O2/l;
- a quantity of suspension particles less than 6 mg/l;
- a total quantity of KJELDHAL nitrogen less than 2 mg of nitrogen per liter;
- nitrite quantities equal to or near 0;
- nitrate quantities less than 60 mg of nitrogen per liter.
Dependencies are inferred from the claim text.