In municipal or industrial water treatment plants, costly drinking water is often used for general cleaning and maintenance procedures in the system. By the simple action of treating and using the water from the final clarifier, drinking water can be saved.
The effluent in both dry and wet weather is almost clear and contains only low levels of suspended matter. Nevertheless by implication it is not suitable for use as process water because the insoluble organic matter can cause blockages in the system.
Hydac automatic filters are ideally suited to the treatment of clarifier effluent. Advantages include:
* Smooth operation of flow indicators, solenoid valves and injection nozzles.
* Increased operating safety.
* No spare part requirement, ensuring continuous operation.
* No maintenance requirement, ensuring continuous operation.
* Man hours saved in filter maintenance.
* Drinking water saved when preparing flocculent treatment.
* Drinking water saved when dewatering the sludge.
* Compact and space-saving equipment.
* Continuous operation because of automatic regeneration of the filter.
* Ecological and at the same time economical system operation.
Success in the field
Hydac filters have been used successfully for years. The filter systems are in continuous operation and function independently without maintenance and without breaking down. Apart from the purchase and installation costs there are only very low annual power costs to operate the filters. If one compares the investment and operating costs to the cost of drinking water, then the filter pays for itself in a very short time.
Hydac AutoFilt TwistFlow Strainer ATF is suitable for separating particles from water and media similar to water. The strainer is principally a hybrid of centrifuge separator and an inline filter which, as a result of its special flow characteristics, ensures that higher particle loads are also filtered reliably.
During the cleaning phase, depending on how the strainer is installed, some of the untreated water flow is used for a few seconds to clean the element and to flush out the filter housing. The remaining particles of lower densities, which are not forced down by the centrifugal force, are retained by the tapered slotted tube to a defined filtration rating.
Since only some of the flow is used for flushing, filtration can continue almost uninterrupted. In addition the unit is ideally suited to offline applications that can manage without part of the flow for a short period. Depending on the application and incoming particle loads, the sludge-removal intervals can be individually adjusted to suit the treatment process via a timer control.
Hydac’s automatic filters are self cleaning systems for extracting particles from nearly all types of media. The filtration is suitable both for mainline and offline applications. AutoFilt RF3, RF4 and ATF are used in the treatment of water effluent from the final clarifier. The back-flush fluid is fed back into the primary clarifier. The special conical shape and configuration of the filter elements allows even flow, resulting in low pressure drops and complete cleaning of the elements. The advantage: fewer back flushing cycles and reduced loss of back flushing fluid.
For more information contact Walter Heijboer, Hydac Technology, +27 (0)11 723 9080, [email protected], www.hydac.com
| Tel: | +27 87 163 5000 |
| Email: | [email protected] |
| www: | www.hydac.co.za |
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