Stroud Sewage Treatment Plant

Environment Protection Licence #13042
The Stroud sewage treatment plant Environment Protection Licence (#13042) stipulates concentration limits for specific water quality parameters from treated effluent prior to discharge. The Stroud licence operates under a range of concentration limits including 90 percentile and 100 percentile limits. These limits relate to monitoring results throughout the licence period.

 

To meet a 90 percentile limit, the monitoring results must not exceed the specified concentration limit for 90% of the time during the monitoring period. The 100 percentile limits are not to be exceeded, alternatively the maximum concentration.

 

The Stroud licence monitoring period is reported upon annually with a 14th of May anniversary. As a condition of the licence the treated effluent is monitored monthly. Discharge concentration limits are specified for: biological Oxygen demand (BOD); total suspended solids (TSS); faecal coliforms (FC); total phosphorus (TP); ammonia; total nitrogen and ph. The corresponding concentration limits stated in the licence for each of these parameters are listed in Table 1.

 

Table1.Stroud licence effluent concentration limits for Biological Oxygen Demand, Total Suspended Solids, Total Phosphorus, Faecal Coliforms, Ammonia, Total Nitrogen, pH, Oil and Grease.

 

Stroud STP
EPA I.D point No 1.
Discharge to waters
BOD
TSS
TP
FC
Ammonia
Total Nitrogen
pH
Oil & Grease
mg/L
mg/L
mg/L
cfu/100ml
mg/L
mg/L
pH units
mg/L
90%ile
Limit
10
15
200
7
100%ile
Limit
15
20
4.4
600
2.0
10
6.5-8.5
10

 

EPA Licence

Stroud Effluent Results EPA id point No 2