Two-phase stormwater treatment –
compact, with automatic cleaning

The System

The com­pact HydroSep­a­ra­tor sat­is­fies enhanced require­ments for stormwa­ter treat­ment. The treat­ment is car­ried out in three phas­es I‑III (sep­a­ra­tion of float­ing debris, sed­i­men­ta­tion, fil­tra­tion). A sand­trap installed at the begin­ning of the process retains coarse min­er­al grit. A screen (I) pre­vents the entry of float­ing debris into the con­nect­ed sed­i­men­ta­tion unit.

In the next clean­ing phase the stormwa­ter pass­es through a lamel­la mod­ule (II) which sep­a­rates solids and fin­er par­ti­cles. Con­nect­ed trick­le fil­ter ele­ments (III), are flowed from top to bot­tom, sig­nif­i­cant­ly reduc­ing the con­cen­tra­tion of sus­pend­ed solids in the out­let dis­charge of the plant. 

Should the capac­i­ty of the treat­ment equip­ment be exceed­ed dur­ing a storm event, the less pol­lut­ed stormwa­ter is relieved over an emer­gency weir into the receiv­ing water. Thus, the max­i­mum hydraulic load­ing of the plant will not be exceeded.

Fol­low­ing a storm event, the water in the sed­i­men­ta­tion cham­ber is pumped out towards the sew­er chan­nel. At the same time, the lamel­las, the fil­ter and the basin are auto­mat­i­cal­ly cleaned with a spray noz­zle using part of the treat­ed water. The treat­ment plant is now oper­a­tional for the next storm event.

Efficiency

Sci­en­tif­ic test­ing has shown a reten­tion rate of between approx. 80 and 90% for sus­pend­ed solids (SS). Out­let val­ues for SS are approx. 10 – 30 mg/l.

The sed­i­men­ta­tion rate of stormwa­ter tanks can be sig­nif­i­cant­ly increased by instal­la­tion of lamel­la tech­nol­o­gy, thus reduc­ing con­struc­tion dimen­sions and sav­ing costs.

Capacity

The capac­i­ty of stan­dard sys­tems varies between 5 and 1,000 l/s. Cus­tomised equip­ment can be con­struct­ed to accom­mo­date larg­er vol­umes of stormwater.

HydroSep­a­ra­tor is deliv­ered as a com­plete solu­tion includ­ing pumps, lev­el sen­sors, SRO and instal­la­tion. A ser­vice and main­te­nance pack­age is also available.

The Advantages

• min­im­i­nal con­struc­tion vol­ume required 
• low oper­at­ing costs
• ful­ly auto­mat­ic operation
• high­ly effi­cient clean­ing power
• high rate of sol­id par­ti­cle and pol­lu­tant elim­i­na­tion means effec­tive water pro­tec­tion 
• the sys­tem sat­is­fies enhanced require­ments for stormwa­ter treatment