Bevel-helical speed reducer B4 ing information Data position of the Article No B4-FH27A

Flender/Flender Gear Units/Bevel-helical speed reducer B4

WWTP (DWS Licence 2/2/2/2/A2/1/ Parameter Unit Limit COD mg/ 5 Free and Saline Ammonia mgN/ 1 Nitrate/Nitrite mgN/ 6 Ortho- (2- mgP/ 0.9 Ortho- (2- mgP/ 0.5 Ortho- (2- mgP/ 0.1 Total Suspended Solids mg/ 1 pH 6.5 < pH < 8.5 Electrical Conductivity mS/ 8 Faecal Coliform CFU/1 0 The City of Tshwane indicated that the final effluent Ortho limit might be reduced further in future and figure as low as 0.0 mgP/ has been indicated in discussions between the City of Tshwane and the DWS. 4-8 4.4 PLANT CAPACITY AND PERFORMANCE 4.4.1 Baseline ( Infl uent Flows and Loads The measured raw influent flows and loads from 1st January to 3st December 2 were used as the baseline for the activated sludge aeration energy evaluation. Data from routine site measurements was used to calculate the average raw influent flows and loads given in Table 4-3. Also included in Table 4-3 are the design values applied during the 2 upgrades. Table 4-3: Zeekoegat WWTP 2 Average Raw Influent Flows and Loads (Including design values) Parameter Units 2 Design Flows AAF Ml/ 6.6 ADWF Ml/ 5.4 8 Loads TCOD kg/ 2,2 5,8 TKN kgNd 2,6 5,8 FSA kgN/ 1,5 3,1 Total kgP/ 2 9 Ortho kgP/ 1 4 TSS kg/ 1,0 2,6 Concentrations TCOD mg/ 4 6 TKN mgN/ 3 6 FSA mgN/ 2 3 Total mgP/ 4 1 Ortho mgP/ 2 6 TSS mg/ 2 2 Alkalinity mg/ as CaCO 3 2 2 The plant loading is still below its design capacity re ceiving about 5%, 4% and 3% of the design TCOD, TKN and Total loads respectively. The TSS load is slightly higher at 6% of the design load. Additional data was also collected through specia sampling program during the 2 winter (June to August) and 2 summer (January to February) to determine the seasonal diurnal flow and load patterns as well as wastewater characteristics to be applied for mathematical modelling. summary of wastewater characteristics is given in Table 3.4. Graphical variations of the flows and loads in 2 are given in Appendix