The Algona Upper Des Moines from Algona, Iowa on August 18, 1955 · Page 18
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The Algona Upper Des Moines from Algona, Iowa · Page 18

Algona, Iowa
Issue Date:
Thursday, August 18, 1955
Page 18
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New Plant Handles 3,500,000 Gallons Daily One of the Most Modern of Its Kind In the Middle West Jim Egli At Controls In Ihe photo above, plant operator Jim Egli is shown at the controls of the "exchanger", housed in the administration building. In order for the bacteria in the digester to survive, the temperature must be kept at a Constant 36 degrees. For this reason the sewage is continually transported through a heat exchanger. Bacterial activities in the digester form a melhylamine gas which, when it runs 3,200 cubic feet a day, will be trapped and used to run the heat exchanger and other machinery which at present run on oil. Thus the equipment will originate and produce its own fuel. Special Training Needed To operate a sewage disposal plant of the size of the Algona installation, you need a sound working knowledge of more than a dozen complex units of machinery, and to get in trim for this specialized job, plant operator Jim Egli attended a nine-weeks night school session, held at Mason City. At this school. Egli absorbed all the technical knowledge for operation of Ihe many units. Eg|i is assisted in operation of the Algona plant by Fred Gronbach. HERE'S HOW ALGONA SEWAGE PLANT WORKS Recently, the city of Algona officially accepted the new sewage treatment plant from the engineers who designed it and supervised its building. However, the plant has been in actual operation since June 2, treating sewage, and now that the "trial period" is over, it is felt that the plant is on a very efficient basis, which will be made even more efficient. Upwards of 40,000,000 gallons have been treated in the plant so far. The equipment has a capacity to handle about 3,500,000 gallons a day, which it is estimated will be ample to handle the needs of Algona for some twenty-five years, at a normal rate of population growth. Explanation of Operation Starting at the very beginning of the entire operation, the sewage pipe lines from the north and south sections of town meet in a pit outside the plant and the sewage is immediately carried into the screen house, where objects such as sticks, cans, etc., are removed and ground up. This is then returned to the sewage. The next step is the detriter which is a grit removing chamber. Here sweeping tread wheels keep the organic material in suspension, sweep- Congratulations To the City of Algona As General Contractors for the new Algona Sewage Treatment Plant, we can assure citizens of Algona that their new installation is one of the very finest of its kind . and will be of un-ending value to the community through the passage of years. Our pleasant relations with your city officials and all who had a part in the completion of this project will stand as a valued memory to this firm. ATTEND THE SEWAGE TREATMENT PLANT OPEN HOUSE SUNDAY! WELDEN BROTHERS CONTRACTORS Iowa Falls, Iowa Members of the Associated General Contractors of America ing the grit into the grit chamber after it settles on the bottom. Administration Building The sewage now passes into the wet pit located in the administration building. Here the amount of flow is measured and recorded by an indicator, giving the total amount entering the plant for every minute of the day. From here three Fairbanks-Morse pumps force the sewage up to the Clariflocculator tank. Next the flow arrives in the filter bed, a gigantic circular rock bed nine feet deep and 123 feet in diameter, which contains 78 loads of quartzite rock. Living on the rocks are green algae, upon which arobic bacteria make their home. Open air sides supply the necessary oxygen for the bacteria while they go to work on the waste materials. It is in this bed that about 65' '< of the treatment takes place. The speed of the operation at this point depends a great deal on the efficiency of the other removal machines the sewage has just passed through. Final Operation The sewage now passes into the secondary clarifier, where remaining solids, if any, are removed and sent to the digester. The liquid portion, treated to 91' < of efficiency, is carried into the river. Numerous tests must be constantly run in the plant 'for the satisfaction of the State Board of Health. There are four principal tests that are made constantly: The B.O.D. test (biochemical oxygen demand test) which determines how much oxygen is needed by the bacteria to oxidize the organic material in the sewage; the methy- lene blue test, which gives the relative stability of the treatment process percentage wise,- the settleable solids test, to find out how much settlement of sewage and reduction of organic content occurs in each unit as it goes through the plant; comparator test, which determines whether incoming sewage is alkaline or acid. Complex Testing Equipment The centrally-located administration building on the plant area houses most of the equipment for test-making, and most of this equipment is completely automatic. The plant area will be planted and landscaped as time goes on, but even now it offers a host of interesting features to anyone interested in such complex equipment, and to the ordinary citizen, who after all is a tax-payer and owns some small portion of the plant himself. Sunday Open House Hours for the treatment plant's official open house will be from 1:00 to 5:00 P. M. next Sun- da'y, when the public is invited to visit the site and share in the guided tours to be made of the plant. A Mark of Progress As suppliers of equipment and methods for modern sewage treatment and water treatment plants throughout the United States and the world, we take great pleasure in presenting our phase of the Algona project, which included the specialized units which you will see Sunday. This plant is unquestionably one of the finest of any in a community of the size of Algona. II *** The New Algona Plant Features The Finest Of Sewage Treating Equipment The DORR Type T (AB) Detriter For removing grit from the sewage. It produces a substantially grit-free liquid and a clean, well-washed and drained grit. The washed grit may be used around the plant for sand beds, walkways, etc. The DORR Clariflocculator This is the big circular unit to be seen on the hill, for the flocculation and removal of suspended solids and that material which tends to float. This unit is a combined Dorrco F|occulator and Door Clarifier in a single tank. The DORRCO Type KCB Distributor For the Trickling Filter (rock bed) which evenly distributes the sewage over the rock bed where a biological growth develops which actually feeds on the sewage thus greatly reducing the sewage strength. The DORR Type S-7 Final Clarifier This unit removes the solid material agglomerated by the trickling filter. This mechanism consists of a motor driven revolving raking mechanism which swoops deposited solids to a central discharge hopper. You Will See Ail of the Above Described Units In Operation at the Public Open House Sunday Afternoon A FINE PLANT! A GOOD TOWN! Dorr-Oliver Incorporated Barry Place Stamford, Connecticut Dorr*QHver Incorporated 2631 University Avenue St. Paul 14, Minnesota Equipment Suppliers for Sewage and Water Treatment Plants Around the World

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