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City of Fairfield, Ohio

Wastewater Characteristics 2015

Wastewater Treatment Plant NPDES Discharge Limitations

 

Parameter Daily Min. Daily Max. Weekly Avg. Max. Monthly Avg. Max.
Dissolved Oxygen (mg/l) 5.4      
Oil and Grease (mg/l   10    
pH (S.U.) 6.5 9    
TSS (mg/l)     34.2 22.8
CBOD (5-day mg/l)     28.5 19
NH3 Summer (mg/l)     2.4 1.6
NH3 Winter (mg/l)     15.3 10.2
Fecal Coliform (#/100 ml)     2000 1000

 

Wastewater Treatment Plant Design Data

 

Parameter Design mg/l Design lbs./day Annual Daily Avg. mg/l Annual Daily Avg. lbs./day Lbs. % of Design
TSS 200 16,680 170 7,539 45
CBOD 220 18,384 205 9,092 49
NH3 20 1,668 16.9 750 45

 

Influent 2015 (Daily Avg.)

 

Month

Flow (MGD)

TSS (mg/l)

TSS (lbs/day)

CBOD (mg/l)

CBOD (lbs/day)

NH3 (mg/l)

NH3 (lbs/day)

Jan 5.535 148 6832 194 8955 15.4 711
Feb 4.630 182 7028 260 10040 18.8 726
Mar 7.358 126 7732 190 11659 13.4 822
Apr 7.261 140 8478 178 10779 12.3 745
May 4.305 193 6926 268 9622 20.7 743
Jun 5.007 176 8185 267 11149 18.7 781
Jul 5.208 170 7384 240 10424 19.4 843
Aug 4.619 186 7165 283 10902 18.7 720
Sep 3.658 224 6834 336 10251 25.1 766
Oct 3.931 220 7213 384 12589 27.6 905
Nov 4.850 181 7321 299 12094 18.6 752
Dec 6.230 149 7742 223 11587 18.2 946

 

Effluent 2015 (Daily Avg.)

 

Month

Flow (MGD)

TSS (mg/l)

TSS (lbs/day)

CBOD (mg/l)

CBOD (lbs/day)

NH3 (mg/l)

NH3 (lbs/day)

Fecal Coliform (#/100ml)

Jan 5.535 5 231 6 277 0.22 10  
Feb 4.630 4 154 5 193 0.3 12  
Mar 7.358 7 430 8 491 6.82 419  
Apr 7.261 6 363 6 363 2.8 170  
May 4.305 3 108 5 180 0.3 10 37
Jun 5.007 4 167 5 209 0.4 17 110
Jul 5.208 3 130 4 174 0.7 30 120
Aug 4.619 3 116 4 154 0.9 35 174
Sep 3.658 2 61 6 183 0.9 27 53
Oct 3.931 8 262 7 229 1.0 33 234
Nov 4.850 6 243 7 283 0.7 28  
Dec 6.230 6 312 6 312 0.4 21  

 

Effluent Metals 2015 (Daily Avg.)

 

Month

CN (mg/l)

Cd (ug/l)  Cr-T (ug/l) Cr-D (ug/l) Cu (ug/l Pb (ug/l)

(mg/l)

Zn (ug/l)

Hg (ng/l)

O&G (mg/l)

Jan AA AA AA AA 7.7 AA 1.2 23 1.6 AA
Feb AA AA AA AA 6.1 AA 1.6 38 AA AA
Mar 0.006 AA AA AA AA AA 2.6 25 AA AA
Apr AA AA AA AA AA AA 1.4 31 AA AA
May 0.008 AA AA AA AA AA 2.3 66 AA AA
June 0.007 AA AA AA AA AA 3.4 55 AA AA
July AA AA AA AA 6.7 AA 2.4 35 AA AA
Aug 0.005 AA AA AA 8.0 AA 1.8 33 AA AA
Sep AA AA AA AA 9.3 AA 3.3 42 AA AA
Oct AA AA AA AA 9.0 AA 2.8 49 AA AA
Nov 0.006 AA AA AA 7.8 AA 2.9 37 AA AA
Dec AA  AA AA AA AA AA 0.6 23 AA AA

AA = Below Detection Limit