Interfilt® Filtration System
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ProMinent Dosiertechnik GmbH · 69123 Heidelberg · Germany ProMinent ProMinent Technical Description Interfilt ® Filtration System Automatic Gravity Filter SK Series Interfilt® Filtration System Automatic Gravity Filter SK Series

Interfilt® Filtration System Automatic Gravity Filter SK Series Filtration with the Automatic Gravity Filter (SK) Advantages of the system The automatic gravity filter works on the principle of differential pressure solely by the gravity of the water – without controls – The filter’s “filtration”, “backwashing” and “rinsing” functions use no moving parts. There are no valves, flow meters, controls or indicators. Backwashing is started automatically when the static pressures of the raw and the filtered water change due to the accumulation of impurities in the filter bed. The level of the...

The automatic gravity filter consists of a mild steel tank which is divided into three compartments, one on top of the other. 1. The upper compartment ቢ serves as a storage tank for the backwash water. When full, the contents of this compartment ቢ are sufficient to backwash the entire filter medium. 2. The central compartment ባ is the actual filtration tank. The top of the compartment is the base of the backwash water storage tank. Its base is fitted with filtration nozzles ብ. This compartment contains fine filter sand which retains the contaminents present in the raw water. The nozzles in...

Interfilt® Filtration System Automatic Gravity Filter SK Series Automatic Filter Cycle Filtration Filtration The raw water enters the feed tank ቢ and descends by gravity down the feed pipe ባ into a deflection and air-bleeding tank ቤ.The water then enters the filter compartment and flows down through the filter medium. It then drains from the filter compartment through the nozzles in the base of the filter. The filtrate then collects in the filtrate compartment. As soon as the backwash water storage tank is completely filled via the connecting pipes ቩ the filtrate exits the filter via the...

Due to the decreasing water level in the backwash water storage compartment ቨ, the initial backwash rate of 44 m/h eventually drops down to 30 m/h. Backwashing is automatically discontinued when the water level in the backwash water storage tank drops below the end of the siphoning line ቫ when air is siphoned into the backwash pipe. The influent raw water, following the law of gravity, resumes its downward passage through the filter bed, rinsing it until the backwash water storage tank is refilled. As can be seen, the first filtrate is not discarded as usual but serves as backwash water for...

Interfilt® Filtration System Automatic Gravity Filter SK Series Some Useful Features of the Interfilt® SK Filter The differential head principle R The quality of raw or pre-treated water can vary from time to time. These vatiations are ignored when the filter is backwashed according to a fixed schedule. Either the filter is over-used, or water is wasted on backwashing a filter which is only partially contaminated. A true yardstick of the actual state of a filter is the head loss ∆ p which increases as the filter becomes contaminated. The water level in the backwash pipe (R) is an accurate...

Filtration System Automatic Gravity Filter SK Series Anti-freeze protection As a rule, the filters are installed in the open. However, in cold climates, certain parts of the pipework must be protected against freezing, for instance in narrow pipes and the main backwashing pipe in which water is standing during the filtration process. Freezing is prevented by the use of electric strip heaters or steam jackets. Shipping and installation Filters up to 3.9 m diameter will be assembled completely in the factory. Site installation is simple. Once the filter is correctly located, it is simply...

Interfilt® Filtration System Automatic Gravity Filter SK Series Technical Data Flow Rate: 3...10 m/h Backwash cycle: approx. 8...36 h (depending on type and proportion of contaminants) Head Loss: 120...150 mbar Suspended solids content of the filtrate: (depending on the raw water quality and the filter media) Backwash rate: initial mid-cycle end of cycle Cylinder height: (similar for all types) Overall height: (depending on filter diameter) Backwashing and Refilling Time: Filter Sand according to DIN 4924: - Depth of Layer - Grain Size Filter Nozzles: - Type - Material - Slit Width

a) For continuous operation When there is only one filter, there is no filtered water available for about 15 minutes while the filter is backwashed and refilled. This may be acceptable in most cases. However, if a continuous supply of filtered water is to be maintained, one of the following measures may be taken: – Parallel operation of several filters – Provision of a storage tank if only one filter is available – Adoption of the SK-K version In this version, the filtered water does not leave the filter at the top but it is pumped continuously out of the filtrate compartment. The filtrate...

Interfilt® Filtration System Automatic Gravity Filter SK Series d) Type SK-RI with additional degassing tower If, besides iron and/or manganese, carbon dioxide (CO2) is to be removed, the filter will be equipped with a degassing tower on top of the reaction tank. The water is sprayed into the degassing tower where it is finely distributed (packed column or baffle type) into the reaction tank. A counter-current air stream is blown out of an integrated blower. This scours the carbon dioxide and oxidises the water. e) Type SK-V2 with two vertically partitioned filter compartments Type SK-V3...

The SK Interfilt® Gravity Filter is suitable for practically all filtration applications e.g.: Chemical industry, oil refining, pulp and paper industry, metal industry, food processing and beverage industry, municipal water supply and waste water treatment, plastic and electrical industry, glass industry, etc., power stations and power supply companies. Some examples: By-pass Filtration By-pass filtration Air contaminated with dust, soot, micro-organisms Additional water Re-circulating cooling water in open water cooling systems is subject to a steady increase in the suspended solids...