San Juan Wastewater Treatment
Facility
Project Title:
San Juan Wastewater Treatment Facility
Owner:
City of San Juan, Tx
709 South Nebraska
San Juan, Tx 78589
Contact:
Noe Garza
Noe Garza Engineers, Inc.
Office: (512) 687-4201
Engineer of Record: 
Noe
Garza Engineers, Inc
1200 South Second, Suite #18
McAllen, Tx 78501
EES Employee's Role:
Lead
Design Engineer - Oscar Boudreaux, P.E.
Project Description
The new extended aeration activated sludge
facility was built on a parcel of land with an existing office and pump station.
The building was remodeled to serve as the operator's office. The plant's main
treatment vessel was an oxidation ditch with a vertical turbine aerator and
intra-channel clarifier. Common wall chlorine contact chambers, post-aeration
cells, and sludge holding tank was adjacent on one side of the ditch. A small
plant pump station lifted tank drainage to a new headworks. The headworks
provide a mechanical and manual bar screen with a grit removal system. A
ton-cylinder storage shed provided cover for the chlorination system. Sand
drying beds (five with four sections each) provided ample surface area for
sludge dewatering.
Design Criteria
|
Type of Waste |
Domestic |
|
Flow
(Average) |
1.15 MGD |
|
(Peak) |
3.45 MGD |
|
% Organics |
75.00% |
|
Phosphorus In |
0.00 MG/L |
|
Minimum Operating Temp. |
15 C |
|
Elevation (MSL) |
100.00 FT. |
|
Hydraulic Detention Time |
24.00 Hrs. |
|
Sludge retention Time |
26.00 Days
|
Permit Levels
|
BOD In |
240.00 MG/L |
|
BOD Out |
30.00 MG/L
|
|
TSS In |
200.00 MG/L
|
|
TSS Out |
90.00 MG/L
|
|
TKN In |
20.00 MG/L
|
Process Conditions
|
Total Reactor Volume |
1.15 MG |
|
Hydraulic Detention Time |
24.00 Hrs.
|
|
Sludge Retention Time |
26.00 Days
|
|
Organic Loading |
14.90 lbs. BOD/ 1000 Cu. Ft.
|
|
Ditch MLSS |
4,234.02 MG/L
|
|
Total System Mass |
40,608.53 lbs.
|
|
Yield |
0.68 lbs. of Solids/lb. of Bod Removed Daily
|
|
Sludge Production |
1,561.87 lbs./day
|
|
Food to Microorganism Ratio |
0.08 lbs. BOD In/lbs. MLSS Organics
|
|
Alpha |
0.85
|
|
Beta |
0.97
|
|
BOD Applied |
2,301.84 lbs./day
|
|
Ammonia Nitrogen Applied |
191.82 lbs./day
|
|
Lbs. of Oxygen for BOD Removal |
2,957.86 lbs./day
|
|
Lbs. of Oxygen for Ammonia Removal |
523.14 lbs./day
|
|
Total Oxygen Required Actual Conditions |
3,481.01 lbs./day
|
|
Total Oxygen Required
Standard Conditions |
5,469.71 lbs./day
|
Treatment Facility Components
Pretreatment:
Biological Treatment:
-
Oxidation Ditch
-
Intrachannel Clarifier
-
Sludge Holding Tank
Disinfection:
-
Chlorine contact Chamber
-
Chlorinator
Sludge Disposal:
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