Shtang constructed a wastewater treatment plant using the SBR technology, with gravitational tertiary treatment and aerobic sludge digestion.  The project was a DBOT, in which the company undertook the financing, design and construction, as well as operation and maintenance for a period of 25 years.

The works included a pre-treatment system, biological treatment systems, clarification, gravitational tertiary filtration and sludge treatment.