B2SH-7-C transfer frames Roller straighteners Roller t Bevel-helical gear unit B2

Flender/Flender Gear Units/Bevel-helical gear unit B2

le data on RAS rates was available. The few available recorded data showed that the average -recycle was about 1.7xADWF. There were no records of the -recycle rate. The - recycle pump has maximum capacity of 3.2 Ml/ which is 2 times the design ADWF of 1 Ml/. Effluent Quality The process performance was assesse by evaluating site measured final effluent parameter values. There is an in-situ final effluent composite auto- ampler. Samples were sporadically analysed from January to September; once month and sometimes on daily basis. However from October to December, samples were analysed almost on daily basis. Samples were analysed for FSA, Ortho , Nitrate, TSS and TCOD. Average final effluent parameter concentrations fo 2 are summarised in Table 5-5. The averages have been calculated for the two periods January to August, with the Welgedacht flow and September to December, without the flow diversion. Graphical variations are given in Figure 5-4. Table 5-5: JP Marais WWTP 2 Average Final Effluent Requirements. Also included are the License Limits Parameter Units Average Measured Value Permit Limits Jan-Aug Sep-Dec FSA mgN/ 1 2.3 4 Nitrate1 mgN/ 1.8 0.9 6 Ortho mgP/ 0.3 0.4 0.6 Total Suspended Solids mg/ 2 1 1 TCOD mg/ 3 5 1 The permit limit is for nitrate/nitrite . Site measured values are for nitrate The following is noted from Table 5-5 and Figure 5-4: From January to August (with Welgedacht flow) The average FSA concentration was 1 mgN/; 2.5 times higher than the permit limit of 4 mgN/. Of the 7 measurements record ed, 8% were above the permit limit The average nitrate concentration of 1.8 mgN/ is about 3 times lower than the permit limit. Only 4% of the recorded values exceeded the limit 5-9 The average Ortho limit of 0.3 mgP/ is 5% lower than the permit limit of 6 mgP/ Average TSS concentration of 2 mg/ was 1.5 times higher than the permit limit of 1 mg/. 5% of the recorded values also exceeded the lim