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LIBRARY COPY 

JUN^l 1965 



ANNUAL REPORT 



1961 



TOWN OF TRENTON 



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ANNUAL REPORT 



ON 



TOWN OF TRENTON 



SEWAGE TREATMENT PLANT 



OWRC PROJECT - 57 -S -4 



TRENTON SEWAGE TREATMENT PLANT 



OPERATED FOR 



THE TOWN OF TRENTON 



BY 



THE ONTARIO WATER RESOURCES COMMISSION 

Mr. A. M. Snider - Chairman 

Dr. A. E. Berry - General Manager 

Mr. D. S. Caverly - Assistant General Manager 

and Director of Plant Operations 
Mr. B. C. Palmer - Assistant Director, 

Division of Plant Operations 
Mr. A. Clark - Project Engineer, 

Division of Plant Operations 



TOWN OF TRENTON 
HISTORY 

The Town of Trenton approached the OWRC in 1956 and requested 
aid in the finance, design and construction of certain sewage 
works. Gore & Storrie Limited, who prepared the original report 
in 1950, were asked to prepare the necessary plans and specifica- 
tions , 

In 1957, the Town of Trenton entered into an agreement with 
the OWRC for the construction and operation of sewage treatment 
facilities, the cost of which was to be repaid by the Town over a 
thirty year period. 

Subsequent to the Ontario Municipal Board*s approval, work 
was initiated on Stage I of the project. 

Stage I was resolved to include: 

1. 24" sewer on the west side of the Trent River and 
across to the Dundas Street pumping station. 

2. Pumping Station at Dundas Street on the east side 
of the river. 

3. 16" diameter force mam from pumping station to 
sewage treatment plant. 

4. Primary sewage treatment plant at Herman Street. 
Capacity - 1.0 MGD. 

5. 30" diameter outlet pipe from plant to 500 ft„ 
off shore. 

6. Interceptor and connecting sewers. 
Total cost approximately - $495,000. 



- 2 - 



Tenders were called for November, 1956 and work was begun in 
the spring of 1959. 

The contracts for the various portions of the system were 
largely completed by December, 1959. 

Plant Operations Division of the OWRC took over the operation 
of the sewerage system in January I960, with Mr. A. Hockaday as 
operator. 
Capital Costs of the Project : 



or 



27,260.00 
32,650.00 
57,700.00 
17,225.00 
94,567.00 
187,204.00 
43,413.00 

33.000.00 
493,000.00 
Sewers 

27,260.00 

32,650.00 

57,700.00 

43.413.00 
161,053.00 

15 , 000.00 Engineering 
176,053.00 



Connecting Sewers 

Force Main 

River Crossing 

Fairbanks -Morse 

Sewage Pumping Station 

Sewage Treatment Plant 

Interceptor Sewer on 
Ontario S-reet 

Engineering 

Approximate 

Plant 

17,225.00 

94,567.00 

187.204.00 

298,946.00 

13. 000. 00 Engineering 
317,000.00 



- 3 - 

TYPE OF SEWAGE TREATMENT PUNT 

Primary treatment with provision for extension to complete 
treatment. 
DESIGN POPULATION 

12,000 persons initially; 15,000 persons when extended to 
complete treatment and with provision for doubling to 30,000 
persons. Initial grit removal, screening and outlet sewer faci- 
lities sized for 30,000 population. 
PER CAPITA FLOW 

83.3 Gallons per day. 
DESIGN PLANT FLOW 

1:0 MGD m 111.0 cu. ft./min. = 6,6?0 cu. ft./hr. 
5 DAY BOD OP RAW SEWAGE : 

250 ppm Removal 3 5$ 

Suspended Solids of Raw Sewage : 

200 ppm Removal 55$ 

DIAMETER OF INLET SEWER : 

24" 
DIMENSION OF INLET CHAMBER : 

The raw sewage flows through a 24" x 24" sluice gate into 
the aerated grit chamber from an inlet chamber. 
DIMENSION OF GRIT CHAMBER : 

10' -0" x 3* -6" x 9 T -0" 
VOLUME OF AERATED GRIT CHAMBER : 

765 cu. ft. (not including the hopper) 



- 4 - 

DETENTION PERIOD : 

1 MGD = 765 = 6.95 minutes 
110.0 

Grit removal by air lift to decanting trough and wheel barrow. 

The sewage flows to the screen chamber and thereafter to the 
distribution channel of the settling tanks. 
SCREENING : 

One hand cleaned bar screen, with provision for installation 
of mechanically cleaned bar screen for ultimate plant capacity. 
AVAILABLE AREA : 

5.29 sq. ft. 
PRIMARY SETTLING TANK : 

2 units 
DIMENSION OF TANKS : 

2 (52« x 16» x 12*) 
VOLUME OF TANKS : 

20,000 cu. ft. (not including the sludge hopper) 
DETENTION PERIOD @ 1 MGD 

20.000 _ o i u 

g'35Q' 2 «4 hours 

SURFACE SETTLING RATE : @ 1 MGD 

1.000.000 _/ m , /„ .2 « . . /, 
2 T52* J x l6* ) = gal/feet of tanks/day 

g 1.25 MGD 1.250.000 „ cc , ,~ ^2 _ . , ,. 
2 (52' x l6 T ) 755 gals/feet of tanks/day 

WEIR OVERFLOW RATE: 



l f 000. 000 



= 8300 Gals/lin. ft. of weir /day 



- 5 - 



@ ^ MGD 1 ' 2 |Q 6 OQO = 10,400 Gals/lin. ft. of weir/day 

RAW SLUDGE REMOVAL : 

Longitudinal sludge collector to single sludge hopper each 
pass of settling tank. 
TWO DIGESTION TANKS. TWO STAGE OPERATION 

'f ■ ■ ■— i - i ■ ■■■■-■■■ ■ ■ ■ i. ■ ■ 

DIMENSION OF TANKS : 

Diameter 28') Diameter 28') 

No. 1. No. 2 

Depth 23*) Depth 22') 

TOTAL VOLUME OF TANKS : 

12,717 + 12,117 
HEATED DIGESTERS CAPACITY 



Vi « l£ jt = 2.08 cu. ft. /capita 



12 , 000 

First stage tank is heated by a sludge heater of capacity, 
170,000 BTU per hour. 

Recirculation of gas in the first stage tank is by gas pump 
with a capacity of 150 cfm. Gas withdrawn is used for plant heat- 
ing as available. Provision has been made for both digestion tanks 
to be used as first stage tanks when the plant is extended for 
15,000 persons, and a third digestion tank will be constructed as 
a second stage tank. 
DIGESTED SLUDGE DISPOSAL : 

Digested sludge is disposed of by tank truck haulage. In 1961, 
the Town removed the digested sludge. 



- 6 - 

VALVE HOUSE BETWEEN TWO DIGESTION TANKS : 
Dimenions 

Main Floor 12 » -0" x 11»8" x 12* -6" high 
Basement 12* -0" x 11'3 M x g» -0" high 
CHLORINATION OF EFFLUENT : 

One vacuum type chlorinator with capacity up to 3 50 lbs. 
chlorine per day gives a maximum dosage of 3 5 parts per million 
at average flow. A chlorine pipe direct from the control build- 
ing discharges to outlet chamber. 
METERING 

Total plant flow - by Venturi Meter 
AIR BLOWERS : 

Two air blowers for aerated grit chamber and settling tank, 
entry channel, aeration. 

Maximum Capacity of each blower is 75 cfm. 
OUTLET : 

Effluent is discharged to the Bay of Quinte at the mouth of 
the Trent River, through a 30" diameter outlet to 500 ft. off shore, 

SEWAGE PUMPING STATION ON DUN DAS STREET 
PUMP NO. : 1 
CAPACITY : 700 IGPM 
TOTAL HEAD : 53 feet 
POWER REQUIREMENT 

700 x 53 = 13 L HP 
3300 x 0.85 J ' h 



- 7 - 



MAXIMUM PUMP R.P.M. : 

Revolutions per minute: 900 
PUMP NO. 2 
CAPACITY: 



3130 IGPM diesel - working through Johnson R. A. gear dr. 
TOTAL HEAD : 

100 feet 
MAXIMUM PUMP R.P.M. : 

900 
PUMP NO. 3 
CAPACITY : 

1740 
TOTAL HEAD : 

65 feet 
POWER SUPPLY : 

MAXIMUM PUMP R.P.M. ; 

600 
Total Capacity of three pumps: 5570 IGPM 

Pumps Nos. 2 and 3 have identical casing so that the capacity of 
pump No. 3 may be increased in future to the capacity of pump 
No. 2. Electric motors for driving the pumps Nos. 1 & 3 are drip- 
proof vertical, squirrel-cage induction type, suitable for full 
voltage starting and operation on three phase, 60 cycle alternating 
current. The meters comply with NEMA standards. The diesel engine 



- a - 

is of a type, suitable for operation on No. 2 fuel oil. An 

auxiliary fuel pump is supplied and installed integrally with 

the engine . 

Bar screens at the inlet consist of two section of 2" x £ n bars, 

i.e. 2 sections of 15 bars @ 2" centers. 

OVERFLOW PIPE : 

24 " diameter 
There is a force main on an easement from the Dundas Street sewage 
pumping station to the sewage treatment plant at Herman Street. 
It comprises 760 f of 20" pipe and 2800' of 16" 4 pipe. 



- 9 - 



OPERATION 

The plant and pumping station were operated throughout 1961 
by the OWRC operator, James Stewart. Operation is normally 44 
hours per week. Use was made of casual help for several weeks in 
mid summer for cutting grass and cleaning down tanks. 

On several occasions , the air lift pump was clogged with grit 
which had entered the sewer and had been pumped to the plant. The 
operator was aided by the Town of Trenton Works Department in 
cleaning out this grit. Members of the Works Department also 
operated the plant when James Stewart took his summer vacation. 

Extensive maintenance work was carried out and among the equip- 
ment serviced were sludge pumps, heat exchanger and flow recorder. 
OWRC maintenance staff spent a total of #0 hours at the plant and 
pumping station. OWRC electronics staff spent 15 hours improving 
pumping controls. 

Chlorination of the plant effluent was carried out from June 
1st, 1961 to December 1st, 1961 as requested by the Division of 
Sanitary Engineering. 

245,000 gallons of raw sludge were pumped to the primary 
digester and 98,000 gallons of digested sludge were removed by 
tanker from the secondary digester. 

This would indicate that highly satisfactory digestion was 
accomplished. 

It can be seen from Figures 1 and 2 that BOD and suspended 
solids removed are high for a primary treatment plant. 



LABORATORY ANALYSES RESULTS 



FIGURE I 








DATE 


INFLUENT 


EFFLUENT 


% REDUCTION 


13-2-61 


160 


70 


56.5 


4 - 11-61 


84 


42 


50.0 


28-3-61 


72 


54 


25.0 


24-5-61 


85 


32 


62.5 


20-6-61 


75 


30 


60.0 


26-7-61 


92 


23 


75.0 


29-8-61 


125 


38 


69.0 


26-9-61 


165 


26 


84.0 


24-10-61 


115 


50 


56.5 


28-11-61 


145 


61 


58.0 


12-12-61 


130 


50 


61.5 


AVERAGE 


113.5 


43.25 


62.0 


FIGURE II 

DATE 


INFLUENT 

SUSPENDED SOLIDS 
PPM 


EFFLUENT 

SUSPENDED SOLIDS 
PPM 


% REDUCTION 


13-2-61 


158 


52 


67.0 


4-11-61 


104 


70 


33.0 


28-3-61 


104 


63 


40.0 


24-5-61 


90 


46 


49.0 


20-6-61 


86 


46 


47.0 


26-7-61 


172 


40 


76.5 


29-3-61 


126 


54 


57.0 


26-9-61 


222 


46 


79.0 


24-10-61 


142 


42 


70.0 


28-11-61 


178 


60 


66. C 


12-12-61 


248 


94 


62.0 


AVERAGE 


148 


56 


62.0 



micro ; rapi) 



G8-I42 

t TfAH BY GAYS X 250 0IVN5. 
CALENDER YEAR 



JANUARY 



feesuary 



MARCH 



JUME JULY AUGUST SEPTEMBER OCTOBER NOVEMBER DECEMBER 

0<S 5 10 15 20 25 5 10 15 20 25 5 10 15 70 25 5 1CI5 20; 5 10 15 70 ?5 5 10 15 20 75 5 10 15 20 2S 5 10 15 20 25 5 10 15 20 25 5 10 15 20 25 



' -4- 









■■:'... 



: 



i' •■ 






JijVf.ri.Uj_>- -7-- ■•-•-. - ^J-tji-}-o,-JJiX. . 







5 10152925 SIGHTS 51015*025 5 10 15 70 25 5 10 15 20 iS 5 10152025 5 10 15 20 25 5 10 15 20 25 5 10 15 20 25 5 10 1520 25 5 K I 15 20 25~S lolstoK 
JAMUART FEBRUARY MA RCH APRIL MAY Jul.. JULY AUGUST SEPTEMBER OCTOBER NOVEMBER DECEMBER 



COSTS 

1961 

Operation $ 12,372.13 

Debt Retirement 10,320.00 

Reserve Fund 3,323.75 

Interest 26.231.50 

TOTAL $ 52, 247. 3 8 

Sewage Treated 342,101 million gallons 

BOD Removed 240,470 lbs. 

Suspended Solids Removed 314,732 lbs. 

Unit Operating Cost per 1000 gallons raw sewage treated 3.620 

" " " " lb. of BOD removed 5.14# 

" " " " lb. of S.S. removed 3 .930 

Budget forecast for 1962 

Payroll $ 4,400.00 

Fuel 400.00 

Power 2,800.00 

Chemical 2,000.00 

General Supplies 1,000.00 

Equipment 200.00 

Repairs and Maintenance 380.00 

Sundry 2,200.00 

Water 1,400.00 

TOTAL $ 14,780.00