Skip to Main Content
Table 3

LRV credits across the GRP

Unit processProcess design parametersVirus LRV creditBacteria LRV creditProtozoa LRV credit
Gammams WWTP BNR (long SRT) 0.5–1.0 1.0 0.5 
Pre O3 and Coag/DAF(a) Pre-O3 dose: 3 mg/L
Contact Time: 3 min
Coag Chem's: FeCl3, HCl, polyelectrolyte
DAF SLR: 4 m3/m2/h 
Note (a) Note (a) Note (a) 
Dual media filtration (DMF) Rate: 6 m/hr
Anthracite: 0.7 m (ES 1.3)
Sand: 0.7 m (ES 0.7) 
1.5 1.5 2.0 
Ozone Dose: 12 mg/L
mg O3/mg DOC: 1.1
Contact Time: 24 min
CT: 12 mg/L/min 
4.0 4.0 (>0.6(b))
1.5–2.0(c) 
BAC(d) EBCT: 10 min minimum
Bed Depth: 1.5 m 
Note (d) Note (d) Note (d) 
GAC EBCT: 20 min minimum
No of Stages: 2
Bed Depth: 1.5 m 
0.4 1.7 0.9 
UF Flux: 70 L/m2/h
Recovery: 92% 
2.5–3.0 3.0–3.5 3.0–4.0 
Chlorination Free Chlorination Contact Time: 1 h nom
CT: 27 mg/L/min
pH: 7.8–8.2
Temp: 15–20 °C 
4.0 4.0 0.0 
Total LRV credits – AGWR default LRVs in brackets   12.4–13.9 (9.5) 15.2–15.7 (8.1) 7.9–9.4 (8) 
Unit processProcess design parametersVirus LRV creditBacteria LRV creditProtozoa LRV credit
Gammams WWTP BNR (long SRT) 0.5–1.0 1.0 0.5 
Pre O3 and Coag/DAF(a) Pre-O3 dose: 3 mg/L
Contact Time: 3 min
Coag Chem's: FeCl3, HCl, polyelectrolyte
DAF SLR: 4 m3/m2/h 
Note (a) Note (a) Note (a) 
Dual media filtration (DMF) Rate: 6 m/hr
Anthracite: 0.7 m (ES 1.3)
Sand: 0.7 m (ES 0.7) 
1.5 1.5 2.0 
Ozone Dose: 12 mg/L
mg O3/mg DOC: 1.1
Contact Time: 24 min
CT: 12 mg/L/min 
4.0 4.0 (>0.6(b))
1.5–2.0(c) 
BAC(d) EBCT: 10 min minimum
Bed Depth: 1.5 m 
Note (d) Note (d) Note (d) 
GAC EBCT: 20 min minimum
No of Stages: 2
Bed Depth: 1.5 m 
0.4 1.7 0.9 
UF Flux: 70 L/m2/h
Recovery: 92% 
2.5–3.0 3.0–3.5 3.0–4.0 
Chlorination Free Chlorination Contact Time: 1 h nom
CT: 27 mg/L/min
pH: 7.8–8.2
Temp: 15–20 °C 
4.0 4.0 0.0 
Total LRV credits – AGWR default LRVs in brackets   12.4–13.9 (9.5) 15.2–15.7 (8.1) 7.9–9.4 (8) 

(a) LRVs included in DMF values.

(b) Mieog (2012).

(c) Paraskeva & Graham (2002).

(d) LRVs included in GAC values.

BNR = Biological Nutrient Removal, SRT = Solids Retention Time, SLR = Surface Loading Rate, ES = Equivalent Size, DOC = Dissolved Organic Carbon, EBCT = Empty Bed Contact Time.

Close Modal

or Create an Account

Close Modal
Close Modal