A method for simultaneous filtration and non-discharge backwash operation of a pool filter. Water is received from a pool of water and passed to a control valve having a backwash nozzle aligned with a first filtration chamber. The water is forced down through all of the filtration chambers except the first filtration chamber and forced up through the first filtration chamber. The backwash nozzle is aligned with a second filtration chamber. The water is forced down through all of the filtration chambers except the second filtration chamber and forced up through the second filtration chamber. The water is passed through the backwash nozzle and an internal backwash valve to a sedimentation collection and separation system, where sediment is settled out of the water and the water is filtered through a final filtration media within the final filtration chamber. The water is returned to the pool of water.

A system and method for treating fluid by providing a series of concentric chambers, tanks or tubes so that a fluid flow and treatment efficiency is maximized while size, complexity and cost of manufacture and operation is reduced. In one aspect, a generally non-turbulent fluid flow is received and directed in a radial sequential direction through the series of chambers. Each chamber is configured to house a filter assembly or media that provides a level of treatment for the fluid flow while directing the fluid toward a subsequent concentric filtration chamber. The last sequential chamber directs the fluid flow toward a fluid outlet and reduces the turbulence of the flow generated during the filtration process. The system can be configured to direct the fluid flow in inward or outward radial directions according to various arrangements and during filtration or back flushing operations.

Disclosed are devices, systems and methods for treatment or pre-treatment of stormwater which can provide a high-rate stormwater filtration that is suitable for sites with high particulates (total suspended solid (TSS)) loading.

A particulate filtering device with a multi-layer water distribution and collection structure and a method for using the same are provided. The device includes a tank where a filtering space and a back flushing expansion space are formed. An upper water distribution pipe is arranged above the back flushing expansion space and is in communication with an ozone gas-water mixing pipe. Ozone enters the back flushing expansion space through the upper water distribution pipe and mix with water for reaction. Exhaust gas is discharged from the top of the tank. Powdered activated carbon may enter the tank through the upper water distribution pipe, and is intercepted at a space above the filtering space to form an activated carbon layer, to absorb organics dissolved in the water and catalytically decompose ozone. At least three water distribution and collection pipes are arranged on a layer basis in the filtering space.

A particulate filtering device with a multi-layer water distribution and collection structure and a method for using the same are provided. The device includes a tank where a filtering space and a back flushing expansion space are formed. An upper water distribution pipe is arranged above the back flushing expansion space and is in communication with an ozone gas-water mixing pipe. Ozone enters the back flushing expansion space through the upper water distribution pipe and mix with water for reaction. Exhaust gas is discharged from the top of the tank. Powdered activated carbon may enter the tank through the upper water distribution pipe, and is intercepted at a space above the filtering space to form an activated carbon layer, to absorb organics dissolved in the water and catalytically decompose ozone. At least three water distribution and collection pipes are arranged on a layer basis in the filtering space.

A particulate filtering device with a multi-layer water distribution and collection structure and a method for using the same are provided. The device includes a tank where a filtering space and a back flushing expansion space are formed. An upper water distribution pipe is arranged above the back flushing expansion space and is in communication with an ozone gas-water mixing pipe. Ozone enters the back flushing expansion space through the upper water distribution pipe and mix with water for reaction. Exhaust gas is discharged from the top of the tank. Powdered activated carbon may enter the tank through the upper water distribution pipe, and is intercepted at a space above the filtering space to form an activated carbon layer, to absorb organics dissolved in the water and catalytically decompose ozone. At least three water distribution and collection pipes are arranged on a layer basis in the filtering space.

The present disclosure concerns a filter device for filtering source water for the purpose of obtaining potable water; and further concerns a method for assembly of such a device.

The present disclosure concerns a filter device for filtering source water for the purpose of obtaining potable water; and further concerns a method for assembly of such a device.

The invention is classified as a physicochemical method of natural and waste water treatment and can be used in the energy engineering, chemical, petrochemical, food and other industries, especially in treatment of process, domestic, precipitation, mining, oilfield, quarry water and the water of tailing pounds. The purpose of the invention is to improve the treatment of natural and waste water, to increase the capacity of a moving bed pressure filter and also to ensure high efficiency of the cleaning of the moving bed. The technical result is the expansion of the range of application of the moving bed pressure filter ensuring high efficiency of treatment of both low-contaminated natural water and highly contaminated waste water. This result is obtained due to the use of additional stages of chemical treatment during water treatment (oxidizing agent, demulsifier, powder sorbent), the use of various types of a pressure flocculation reactor, grains for a single and double moving bed, which have different grain composition and density, the performance of four-stage cleaning of the moving bed, the use of a dual-flow moving bed pressure filter, as well as due to the use of the additional pressure flocculation reactor followed by the removal of severe contamination with the use of a pressurized hydrocyclone.

The present invention relates generally to a system and method for treating wastewater in a filter media apparatus having a draft tube system. The filter media may be walnut shell media.