This is a call-off order from which the contractor (AN) must bypass undewatered sewage sludge between different BRW sewage treatment plants (KW) and the return transport of turbid water as well as optional further transport of undewatered sewage sludge and turbid water between different sewage treatment plants for the duration of the contract of the BRW Central operating area.

Approx. 23,000 m³ of liquid sewage sludge and approx. 4,500 m³ of turbid water per year.