PROJ00001

• Contract/PO #: C153168
• Contractor Name: Delta, City of
• Contract Type: Loan
• Water District: 40
• County: Delta
• Bill Number: SB 77-35
• Loan Projects - Doc Type: Feasibility Study

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TABLE III-1

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FILTRATION PLANT CAPACITY

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Operation
Level

Rate of Flow
gpm mgd

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Maximum efficient operation

2,430

3.5

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Maximum recorded during peak periods
for less than 24 hours.

3,580

5.0

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Theoretical capacity not obtainable due
to filtering losses, backwash losses,
backwash sequencing, and shut down time.

4,167

6.0

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The following paragraphs describe the general control and
operational scheme of the filter plant.

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Water enters the filtration plant through
influent control valves located ahead of four
units. The filter media in each filter unit
inch thick bed of selected anthracite coal
as IiAnthrafilt".

cylinder operated
pressure filter
consists of a 24-
commercially known

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Discharge from each filter unit is through rate of flow
controllers and into a plant effluent manifold. Each rate of
flow controller is equipped with a hydropneumatic pilot valve
controller and a rate of flow transmitter connected to an indicator
mounted on the master control panel. A flow tube installed on
the main effluent line transmits an electrical signal, indicating
the differential pressure across the flow tube, to operate an
indicator-recorder-totalizer also mounted on the master control
panel. A second transmitter on the flow tube sends a differential
pressure signal to a post chlorinator to regulate injection of
dissolved chlorine gas into the plant effluent line.

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III - 11

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