65 of 74  Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  xi. Ambient air temperature and relative humidity  : 20  C @ 60% RH  xii. Required oxygen for nitrification  : 4.6 kg  xiii. Oxygen gained through denitrification  : 2.9  xiv. Oxygen concentration in the aeration tank  : 2 mg/l  xv. Alpha factor  : 0.60  xvi. Beta factor  : 0.95  xvii. Diffuser fouling factor : 0.90  xviii. Peak factor for carbon load:  : 1  xix. Peak factor for nitrogen load:  : 1  xx. Required oxygen transfer  : to be calculated by the tenderer (kg O$_{2}$/h)  xxi. Number of total diffusers in the aeration tanks  : to be specified by the tenderer  xxii. Flow rate per diffuser  : to be selected and verified by the tenderer  xxiii. Depth of diffuser (water above the diffuser)  : to be specified by the tenderer  xxiv. Diffuser performance  : to be specified by the tenderer with  supporting graphic/document from the  supplier showing exact air flow rate per  diffuser against efficiency in %.m org  O$_{2}$/Nm$^{3}$.h.m (depth of diffuser)  xxv. Aeration blower power and operation hours/day : Power absorbed against the calculated flow  rate to be supported by the supplier’s data  (e.g. graph and/or document) and required  hours/day  Daily operation hours and power consumption of the remaining equipment such as penstocks, crane,  valves, etc. shall be determined by the tenderer together with supporting documentation /explanation.  The evaluated and committed Sludge Load dependent power consumption for the sludge thickening,  dewatering and sludge drying plant shall be presented.  3.4.1.3 “Sludge Load” derived commitment for sludge process components:  In Volume 4 Schedule 11.3, the Tenderer shall list his evaluated and committed values for the power  consumption dependent on sludge load expressed in total removed sludge in entire plant and applied  for the sludge treatment process. 3_Vol3_d4.3_Section 3_Plant Description_GIR_rev08 