Siemens was awarded a 5.5 million euros (approx. $8 million U.S.) contract to provide a wastewater treatment system and associated piping, instrumentation, and engineering to the Inegol Industrial Zone in Inegol, Turkey. The system is expected to increase the capacity of Inegol’s wastewater treatment plant, while lowering costs. As part of the agreement, Siemens Water Technologies ( will provide a BioFlowsheet+ Solution, consisting of a VertiCel aeration system, Flocculating Energy Dissipating Well Arrangement (FEDWA) clarifiers with Tow-Bro Unitube sludge removal header, and the company’s Cannibal solids reduction system. Siemens will also provide the necessary piping and instrumentation for the system, in addition to all the electrical and automation systems for the plant. The system is scheduled to be commissioned in mid-2009.

The project is expected to increase the plant’s capacity from 55,000 cubic meters per day (CMD) to 130,000 CMD. The contract will include a warranty for the biological process to ensure the plant meets required effluent quality levels.

The order is based on the Bioflowsheet+ Solution Program from Siemens Water Technologies, a new biological process optimization offering that integrates several key wastewater treatment plant operations, including biological, solids separation, solids treatment, and controls. The program evaluates effluent requirements, land availability, and specific cost factors, such as energy use, labor, and disposal.

Besides increased capacity, the system for the Inegol plant is expected to enable a 30 percent savings on power; the ability to expand without adding more clarifier tanks; and improved sludge removal efficiency.

The VertiCel biological nutrient removal system combines mechanical aeration in the anoxic tank with diffused aeration in the aerobic zones. Through optimized aerator selection and stratified dissolved oxygen levels, the VertiCel system requires less installed and operating power than conventional fine-bubble aeration systems.

The FEDWA clarifiers will replace existing center-feed circular clarifiers, increasing the settling velocity while improving the flocculation specification of the suspended growth biomass. The Tow-Bro Unitube sludge removal header ensures positive, rapid removal of settled concentrated sludge in one revolution.
The Cannibal system eliminates the biological solids produced by activated sludge waste systems. This is accomplished through an interchange recycle flow between the activated sludge process and a specially controlled sidestream bioreactor. Besides reducing the costs of hauling biosolids to a disposal facility, the Cannibal system can reduce the plant’s power and labor costs from aerobic digestion and dewatering systems.

In addition to the electrical and automation systems, Siemens will provide coarse and fine screening equipment, equalization tank mixers, a neutralization system with liquid carbon dioxide, sludge dewatering equipment, and blowers for the fine bubble aeration system.