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sediment separator is dewatered by grit pressing. In the field of storm-water management, one of
Pre-mechanical cleaning is essentially based the most important challenges in the domestic
on two pieces of mechanical equipment, the context is the treatment of storm-water from
fine drum filter (slate funnel 1-2mm) and the separating and combined sewer-system. The
sludge- and sediment separator hydrocyclone. amount of storm-water runoff from green ve-
The sedimentation hydrocyclone separates the getated areas is only a fraction of the amount of
greasy sludge and sand. runoff from paved surfaces. On average, around
5-10% of the rainwater run-off from green areas
The advantages of the pre-mechanical cleaning reaches the surface each year. The use of green
system described above are: infrastructure removes a proportion of rainwater
• the system is easy to automate, from the urban storm-water system and reduces
• the investment cost of the equipment is 25 the amount of storm-water runoff from urban
to 30% lower than for conventional built-in surfaces that enters the sewer system without
equipment, treatment. Obviously, the use of green surfaces
• no need to build separate concrete struc- in the combined sewer system will not solve the
tures, issue of drainage and treatment of storm-water
• the separation efficiency of the fine filters runoff from large concrete surfaces, but it can
(for suspended solids) is 20-25%, greatly help.
• low space requirements compared to
conventional concrete structures (space The most important basic unit of the storm-wa-
requirements are 50% less), ter treatment system in the combined sewer
• operating costs about 25% lower than con- system is the low lift, high filter capacity, extend-
ventional pre-cleaning technology, ed casing conventional drum filter (Ø 3,0mm
• significantly reduces the amount of diffi- casing hole), which can be installed alongside
cult-to-biodegrade precipitates and fo- the existing end-drain. The system has the ad-
am-forming materials, vantage of low investment cost, 90% separation
• the high degree of prefabrication reduces of shaped-matter (grit, sewage sludge) waste
the time required for on-site installation. and rapid installation.

IRODALOMJEGYZÉK

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