Figure 3-1. 

The discharge pipe shall be constructed on the route between Batlama Sanayi Street and left bank of Batlama Creek and discharge into Black Sea coast near the mouth of Batlama Creek after crossing the Blacksea Coastal Highway. Outfall structure shall be constructed on existing rock embankment and necessary precautions shall be taken to protect discharge pipe and structure against negative impacts of river and sea. The discharge pipeline and outfall structure shall be designed by the Contractor and shall be submitted to the approval of the Engineer. 

## 3.3.4.18  Blowers for Aeration 

The power distribution panel and MCCs for blowers shall be placed in a different room other than the blowers. Number of blowers shall be determined in such a way that minimum each blower serve one aeration tank. In addition to this, one stand by blower shall be provided. The oxygen and air requirements of biological process during the first years of operation (e.g. 2022) shall be taken into consideration in determination of capacity of blowers. The blowers shall be located close to the activated sludge tanks in a building to protect the equipment against the weather conditions and to protect the environment against the noise generated by the blowers. 

The aeration equipment capacities shall be in such amount to keep the minimum oxygen concentration in the aeration tanks 2 mg/l. The blower capacity calculation has to be based on internationally accepted design standards or ATV-DVWK-A 131E Standard (German Association for Water Pollution Control). 

The blowers shall be of the air bearing or magnetic bearing type or integrally geared centrifugal type with servo operated variable diffusers and servo-operated variable pre-rotation systems for maximum efficiency. All blowers will be equipped with motor, frequency converter, air inlet filter, support, accosting hood, non-return valve and flexible discharge connection, safety valve and pressure gauge. Individual blower shall be switched “ON/OFF”, in case of blower failure and also in order to equalize hours of operation, hours of individual blower an automatic changeover “Duty/Standby” shall be provided. At the each blower discharge pipeline, isolating valve shall be provided. Type of valves must be suitable for air applications. In order to discharge the compressed air between the non-return (check) valve and blower, a blow off valve and its pipeline shall be installed on outlet of each blowers. Type of blow off valve shall be solenoid, pneumatic or actuator controlled. There shall be a thermometer and a manometer on common pressure pipeline of blowers. These instruments shall be controlled and monitored by the SCADA system. The blowers and auxiliaries proposed by the Contractor shall be in accordance with the specifications given in Section 7.8.31. 

The blowers shall be supplied with silencer hoods or cabinet. The maximum acceptable noise level in the blower room shall be maximum 85 dB. Special attention shall be given to the air inlet system, and the temperature in the blower building shall be calculated and necessary measures shall be taken. 

The blower room shall be provided with a travelling overhead crane for installation and service requirements. 

The blowers shall be autonomous and locally controlled. The set point for the oxygen shall be controlled by the SCADA system which shall also monitor the operation of the blowers. 

