Self-cleaning brush screen for CSO discharges – external energy free, hydraulically or electric-powered

The Challenge

Many water­cours­es are blight­ed with san­i­tary debris dis-charged from sew­er over­flow sys­tems. Stein­hardt offers a range of Hydro­Clean^® units that can be used to screen storm over­flow dis­charges pre­vent­ing unsight­ly pol­lu­tion debris. The stan­dard units are water pow­ered and require no con­trol pan­els or elec­tri­cal input; ide­al for rur­al areas where a mechan­i­cal screen is desir­able but the cost of pro­vid­ing the pow­er is high.

The EU Water Frame­work Direc­tive and the nation­al water man­age­ment leg­is­la­tion of the indi­vid­ual EU states pro­vide the basis for the best pos­si­ble pro­tec­tion of our waters. One require­ment is that all inflows and dis­charges are to be equipped to opti­mal, tech­ni­cal standards.

The Way   

Screens are a high­ly effi­cient solu­tion: there are per­fo­rat­ed screens (up to 20% SRV*), bar screens (approx. 20 – 40% SRV*) and brush screens (approx. 40 – 60% SRV*).

The Solution 

The Hydro­Clean^® self-clean­ing brush screen traps sol­id pol­lu­tants reli­ably and con­tin­u­ous­ly  with­in a col­lec­tion cham­ber. After the over­flow event, the debris is returned to the sew­er to be treat­ed at the WWTP. The Hydro­Clean^® brush screen uses water­wheel tech­nol­o­gy and oper­ates with­out elec­tri­cal pow­er. It is easy to retro­fit, even through small man­hole access­es, since instal­la­tion is car­ried out with mod­u­lar units.

The high clean­ing per­for­mance of the Hydro­Clean^® brush screen relies on the brush itself as the pol­lu­tant trap; no per­fo­rat­ed plates or bars are nec­es­sary. Con­ven­tion­al screens, on the oth­er hand, use brush­es to clean the trap­ping bars or per­fo­rat­ed plates, thus frag­ment­ing the screen­ings and low­er­ing the effi­cien­cy of the installation.

Pow­er Units
As an alter­na­tive to the non-pow­ered, ener­gy-free water­wheel drive,
Stein­hardt can pro­vide elec­tri­cal or hydraulic pow­ered units. These are nor­mal­ly select­ed where lev­els do not per­mit a water wheel to be utilised.

Cus­tomised solu­tions include ful­ly remov­able screen units for use in haz­ardous atmos­pheres where man entry is not desir­able. (slide in/slide out).

* Results of a Japan­ese study
SRV = Screen­ing Reten­tion Value

The Advantages

• brush bris­tles act as pol­lu­tant trap
• con­tin­u­ous self-cleaning
• bris­tles guar­an­tee oper­a­tional reli­a­bil­i­ty – no jamming
• opti­mal clean­ing per­for­mance owing to counter-rotat­ing brushes
• robust con­struc­tion
• durable waste­water-proof materials
• award­ed the Ernst Kuntze Prize

Cost Effectiveness

• invest­ment costs reduced
• sav­ings on oper­a­tional costs with con­tin­u­ous self-clean­ing and exter­nal ener­gy-free water­wheel technology
• low main­te­nance
• low equip­ment costs
• retro­fit, even through small manholes
• mod­u­lar design allows greater adaptability