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CA: Saratoga Water Treatment Plant 2/22/99

CALIFORNIA: SARATOGA WATER TREATMENT PLANT

Saratoga Water Treatment Plant
Congress Springs
Saratoga CA 95198
Tel: 408-867-3438
Plant Operators:
    Barry Buckholtz
    Dan Chapman
    Randy Houston
    Norbert Styczynski

PLANT OWNER/OPERATOR
San Jose Water Company
374 W. Santa Clara Street
San Jose CA 95196
TEL: 408-279-7900
EMAIL: customer_service@sjwater.com
Web site: http://www.sjw.com
Contact Persons:

    R. Scott Yoo, Water Quality Manager
    Andrew W. Gere, Water Treatment Supervisor
    Richard J. Pardini, Chief Engineer
    Gary D. Bentson, Planning Supervisor

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This is an architecture study photo of SJW's 1932 art deco main office by night



EQUIPMENT & MEMBRANE SUPPLIER


Memtec America Corporation
5 West Aylesbury Road
Timonium MD 21093
Web Page: http://www.usfmemcor.com
Contact Person: Patricia L. Scott
Tel: 410-308-2955; 1-800-MEMCOR4
Fax: 410-561-3017
Web site: http://www.memtec.com


CONSULTANTS


Douglas R. Brown
Camp Dresser & McKee, Inc.
One Walnut Creek Center
100 Pringle Ave., Suite 300
Walnut Creek CA 94956
TEL: 925-933-2900
FAX: 925-933-4174
EMAIL: browndr@cdm.com		 Gary A. St. John
Camp Dresser & McKee, Inc.
739 Thimble Shoals Blvd.,
  Suite 704
Newport News VA 23606
TEL: (757) 873-8850
FAX: 757-873-3283
EMAIL:stjohnga@cdm.com		 William B. Suratt
Camp Dresser & McKee, Inc.
1701 Hwy A-1-A, Suite 301
Vero Beach FL 32963
TEL: 407-231-4301
FAX: 561-231-4332
EMAIL: surattwb@cdm.com
Web site: http://www.cdm.com

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SUMMARY DATA
Startup Year1994
ProcessMF
Capacity (MGD)5.0
Recovery Rate (%)93
Pretreatmenttwo 380-mm (40x40 mesh) mechanical continuous-cleaning strainers
Post-Treatmentdisinfection via liquid sodium hypochlorite
Feed Water Compositionseasonal stream with high & fluctuating turbidity
Product Water Compositionturbidity < 0.2ntu
Concentrate DisposalpH adjustment, discharge to 320,000 gallon settling lagoon before being recycled to the plant raw water



Memcor M10 Modular Membrane Filter

U. S. Filter Memcor Membrane Filters



The Memcor division of U.S. Filter specializes in the supply of filtration equipment to the municipal and industrial markets. Memcor's patented gas backwashing membrane microfiltration system has been effectively deployed throughout the world where cost effective large volume filtration needs must be met.



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Adapted from U. S. Filter Memcor Application Bulletin A1075-A Issue Date May 1994 which can be ordered by email by visiting http://www.memtec.com/memcor/techinfo/techindex.html

FACILITY: SARATOGA WATER FILTRATION PLANT
SITE: Congress Springs,Saratoga,California,USA
CLIENT: San Jose Water Company, City of San Jose, California,
ENGINEER: Camp, Dresser and McKee Engineers Walnut Creek, California

Plant specifications
Microfiltration arrays 6 x 90OM10
Membrane Polypropylene, 0.2 micron, hollow fiber
Backwash Lair system Dual Sullair rotary screw compressors, dryers and single receiver
Control system Allan Bradley, SLC500 w/control view interface
Raw water pumps 2 x 60 Hp splitcase centrifugal
CIP system Coated steel tank, Goulds recirc. pump
 
Operating Data
 
Capacity Operating 5.0 MGD
Raw water Turbidity 0.9 to 600 NTU
Filtered water Turbidity 0.03 NTU
Particle Reduction Range 3.0 to 3.7 Log
Water Temp. Range 44 to 61° F
Water pH 8.1 average
Integrity Test
Auto every 24 hrs. at an average pressure decay of 0.27 psi/min.
Backwash Interval
22 to 240 mins. (varies based on raw water turbidity and temp.)
Clean in Place
Approx. once every 30 days under normal operation
System Recovery
90 - 97% (backwash water from lagoon is reclaimed)
Disinfection
0.8 mg/l chlorine (Sodium Hypochlorite dosing)
Commissioned
March 1994

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Application Bulletin A1075-A (Cont'd.)

Purpose of Plant
The existing water treatment facility was a diatomaceous earth pressure filter system over 20 years old. This plant was taken off line when raw water turbidities exceeded 5.0 NTU, which equated to 1 million gallons a day of potential water left in the stream.
Background
San Jose Water through CDM had undertaken a technical and economic feasibility study of Diatomaceous Earth, Conventional 2 Stage filtration, Direct Filtration, Ultrafiltration and Microfiltration. The analysis determined that Memcor Continuous Microfiltration, CMF, provided an overall advantage over competing technologies, principally due to its ability to filter high turbidity water without the need for coagulation chemicals.
Environmental and Site Considerations
SJWC utilized an existing building enabling the project to be accelerated in order to meet the requirements of the Californian State Department of Health position that the existing plant did not fully comply with the Surface Water Treatment Rule (Section D2). Building size is 40 x 40 with some previous earthquake cracking and level variation. The microfiltration arrays, control panels and air supply system, were all installed inside the building. Outside was positioned the CIP system that reused an existing tank. The backwash water is sent directly to the lagoon and then recycled through the CMF arrays. The water source is a seasonal stream that has peak flows in the winter and is dry in summer. Rainfall in the upper water shed can quickly produce very high turbidities between 200-600 NTU'S. The flows can also vary dramatically, which again can now be accommodated easily with microfiltration.
Economics
Current estimates place the payback period at 4 to 6 years, which would be reduced the longer water is available to run the plant . The Memcor scope of supply was less than $0.50 GPD for normal operation and 0 & M costs are estimated to be less than $0.20/1 000 gallons produced even under high turbidity conditions.
Process Design
Water is pumped through 2 x variable frequency drive pumps to 2 x auto backwashing strainers (Kinney 500 micron), then to the 6 x 90OM10 microfiltration arrays with filtered water chlorinated to 0.8 mg/l chlorine and pumped to a storage reservoir (800,000 gallons). The air supply system for the gas backwash is comprised of 2 x 50% rotary screw compressors (Sullair) and dryers (Sullair), feeding a single receiver (1 060 gallons). The CIP system is comprised of a Memclean storage (2 x 55 gallons) transfer pump, solution mixing tank, and recirculation pump (Goulds). The control system uses an Allen Bradley control view with a SLC 500 controlling the slave PLC's on each CMF array. The control system is integrated into San Jose Water Company's SCADA system and enables the operation to be remotely monitored.