Abstract:
Method of removing dissolved organic carbons from raw water, containing suspended and/or colloidal matter in a suspended ion exchange process, includes: feeding the water into a plug flow reactor at a rate of at least 500 m3/h, adding an anion exchange material to the liquid at the inlet of the reactor, suspending the anion exchange material in the water, transporting the water and the suspended anion exchange material under plug flow conditions to an outlet of the reactor after a predetermined residence time, feeding the water and the suspended anion exchange material to a separator and feeding treated water and anion exchange material from a reactor outlet to a separator, wherein the concentration of the anion exchange material in the reactor is smaller than 20 ml/l, and the residence time of the anion exchange material in the reactor is lower 30 minutes.
Abstract:
The invention relates to a filter device comprising a filter vessel with a fluid inlet for unfiltered liquid, a filter element in the filter vessel with a filter inlet that is in fluid communication with the vessel and with a filter outlet, the filter outlet being via a cleaning duct and a cleaning valve in fluid connection with a cleaning device, the cleaning device comprising a cleaning fluid chamber comprising a volume V0 of cleaning fluid and a pressure chamber at a starting pressure P0, in fluid connection with the cleaning fluid chamber for supplying cleaning fluid from the cleaning fluid chamber to the filter outlet, via the cleaning duct, characterized in that a cleaning fluid supply line connected via a supply pump to the cleaning fluid chamber for supplying a volume Vr of cleaning fluid to the cleaning fluid chamber while the cleaning fluid chamber is in open fluid connection with the pressure chamber and the cleaning valve is closed so that the pressure in the pressure chamber rises to at or about the starting pressure P0.
Abstract:
The invention relates to a reactor vessel for suspending media particles, such as ion exchange resin particles,in a fluid. An air injection device is situated near the reactor bottom and a draft tube extends along the center line, substantially above the air injection device. The air injection device is spaced at a predetermined distance from the bottom, a fluid passage being defined between a lower surface of the injection device and the bottom. This allows for adjustable efficient suspension of the media particles so as to prevent vertical stratification without "dead areas" being formed near the bottom in which particles can accumulate. At the same time air inflow areas can be created extending sideways beyond the draft tube over a larger distance for creating proper turbulence in these zone required for interface reactions at relatively small vertical reactor dimensions.
Abstract:
The invention relates to a counter current gravity driven sedimentation device having an array of mutually parallel plates with sideways fluid inflow from a feed channel extending in the feed direction extending transversely to the plates. A two- dimensional array of flow channel elements extends below the parallel plates to prevent the inflowing fluid from entering between the plates along the plates lower edge while allowing settling sludge to freely settle downward into an agglomeration zone. Formation of a sludge blanket below the plates is prevented and interference of the inflowing fluid with settling slugdge is reduced, enabling a higher throughput of the device.
Abstract:
The invention relates to Method of removing dissolved organic carbons from raw water, containing suspended and/or colloidal matter in a suspended ion exchange process, comprising the steps of: -feeding the water into a plug flow reactor at a rate of at least 500m 3 /h preferably at least 1000m 3 /h, -adding an anion exchange material to the liquid at the inlet of the reactor, -suspending the anion exchange material in the water, -transporting the water and the suspended anion exchange material under plug flow conditions to an outlet of the reactor after a predetermined residence time, -feeding the water and the suspended anion exchange material to a separator and -feeding treated water and anion exchange material from a reactor outlet to a separator, wherein -the concentration of the anion exchange material in the reactor is smaller than than 20 ml/l, and -the residence time of the anion exchange material in the reactor is lower 30 minutes.
Abstract:
The invention relates to a filter device comprising a housing with an end part and a side wall and containing an axially arranged array of filter elements, such as ceramic elements. An inlet in the end part supplies fluid to the filter elements and an outlet in the side wall is provided for transporting filtered fluid from the housing, the side wall of the filter device being provided with a cleaning duct for supplying cleaning fluid to the filter elements via the side wall. The cleaning duct 6 comprises a distal channel portion 15 having a relatively small diameter D1 and a proximal portion 16 adjacent the side wall having a relatively large diameter D2. A number of partitions 36,37 extend in the proximal portion from a position at or near the sidewall towards the distal channel portion 15 at an angle (β) to a centre line 20 of the cleaning duct 6.