GORMAN-RUPP VG3B3-B, Installation, Operation And Maintenance Manual

Page: 128 / 1180

Design Notes
AUGUSTA CORRECTIONAL CENTER VA / Design#: 131349
- To achieve an effluent monthly average total phosphorus limit of 0.3 mg/L, the biological process, chemical feed systems, and
Aqua Cloth Media Filter need to be designed to facilitate optimum performance.
- A minimum of twelve (12) daily composite samples per month (both influent and effluent) shall be obtained for total phosphorus
analysis.
- Influent to the biological system is a typical municipal wastewater application with a TP range of 5 mg/l P. Influent TP shall be
either in a particle associated form or in a reactive soluble phosphate form or in a soluble form that can be converted to reactive
phosphorus in the biological system. Soluble hydrolyzable and organic phosphates are not removable by chemical precipitation
with metal salts. A water quality analysis is required to determine the phosphorus speciation with respect to soluble and insoluble
reactive, acid hydrolyzable and total phosphorus at the system influent, point(s) of chemical addition, and final effluent.
- Chemical feed lines (i.e. metal salts) shall be furnished to each reactor, aerobic digester and recycle stream as necessary. Metal
salts shall be added to each reactor during the React phase of the cycle.
- Chemical addition (i.e. metal salts) shall be furnished prior to the filter. Adequate rapid mixing must be provided as part of the
chemical feed system. The chemical dosage should be flow-paced and controlled to avoid overdosing. Jar testing with various
metal salts is recommended to determine the most effective metal salt as well as the optimum dosage, and to estimate the
degree of phosphorus removal that can be achieved.
- pH monitoring and control in a range of 6.8-7.2 of the upstream biological reactor is required when adding metal salts.
- The cloth media filter will only remove phosphorus that is associated with the TSS removed by the filter. Solids include both
biological and chemical solids.
Membrane
- The AquaMB system is designed to process the Maximum Design Flow of 0.87 MGD with all membrane trains online. It is
assumed that
chemical
cleaning operations (~
2
/
day
frequency) can be selectively conducted during non-peak flow periods.
- Sodium hypochlorite
, caustic,
and
hydrochloric
acid feed systems for the membrane
cleaning
processes are
to be provided by
others
.
- Neutralization system (if required) is not included. Depending on the particular characteristics of the wastewater (hardness, etc.)
a caustic feed system may be required to facilitate necessary membrane cleaning operations.
-
Feed
and
Backwash
pump quantities and horsepower could vary slightly depending on final design.
-
Feed and Backwash
pumps will be VFD controlled.
Equipment
- The basin dimensions reported on the design have been assumed based upon the required volumes and assumed basin
geometry. Actual basin geometry may be circular, square, rectangular or sloped with construction materials including concrete,
steel or earthen.
- Rectangular or sloped basin construction with length to width ratios greater than 1.5:1 may require alterations in the equipment
recommendation.
- Tanks are not included and shall be provided by others.
- Influent is assumed to enter the reactor above the waterline, located appropriately to avoid proximity to the decanter, splashing
or direct discharge in the immediate vicinity of other equipment.
- If the influent is to be located submerged below the waterline, adequate hydraulic capacity shall be made in the headworks to
prevent backflow from one reactor to the other during transition of influent.
- Gravity decant has been assumed based upon the centerline of the decant discharge from the basin at 1 ft below the low water
level.
- A minimum freeboard of 2.0 ft is recommended for diffused aeration.
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Aqua-Aerobic Systems,
Inc.
CONFIDENTIAL