- clarifers, Terrace Review ~— Wednesday, August 12, 1987 13 lew sewage | treatment plant will duplicate ~ The main building on tice feft will be all tha t remains of Terrace’s present waste treatment plant when. the new treat- ment plant begins operation in late October. Operating costs of the Primary digester, Heat exchanger and secondary digester will be a thing of the past. Behind the old treatment plant Is a pile of focal clay that will be used instead of pavement to tine the new sagoone. The use of clay as a tiner will be a major cost saving factor in plant. coristruction. , TERRACE : — Construction of the new $1.6 million sewage treatment plant at the foot of _ Craig St. has started with site: preparation by Bud Smith Con- ; tracting of Terrace, “* "by Tod Strachan. According to. the Foreman of ‘Environmental Health Services ' for the city, Don Gare, the new plant should be in operation by early November and should pro- vide nearly maintenance-free service for more than 20 years. Gare -explained -that a new system was necessary because the old plant was about 20 years old, and, although not yet at its maximum capability, it can’t be" efficiently expanded and the quality of the effluent does not meet government standards, He said that besides the ef- fluent from the. new system meeting government standards, ‘the system will cut present. operational and maintenance costs, meet the needs of the city for at least the next 20 years, and will be simple to expand when required by the community. Gare said that wastes present- ly reach the plant site through a 20 inch main line, go through a. comminutro. which shreds any solids, and are then pumped up 25 feet to enter the existing system. He explained that this is the point where the new system will take over and the rest of the existing plant will be eliminated. In the old system, Gare ex- plained, wastes were pumped to two settling tanks, called measuring approx- imately 20 by 75 feet and about IS feet deep, through which. solids were circulated to allow the initial waste treatment: pro- cess to take place. He said the waste material then passed through a heat ex-. _ changer where the temperature was raised to'100 degrees Far-. enheit, then piped. under pres-. sure to-a primary digester (an - enclosed concrete tank) where ‘Methane gas was formed ‘to speed the process. In the final steps of the. old process, wastes were then piped: to a secondary digester where they were dried and the remain- ing ash was trucked away. Any remaining liquids, he said were recycled: through-the system. By comparison, Gare explain- ed that the first stage of the new process was a ‘grit chamber’ .which slowed the flow. of waste material, allowing sand and non-organic wastes to settle, _ similar to the clarifiers in the old system. Wastes will then flow into ihe first of two lagoons, each méa- . suring 358 by 440 feet and 15 feet in depth where they will be- ‘held for 30 days by a newly designed - system simulating the natural treatment of . wastes; - before being released into -the: Skeena as a harmless liquid, Gare said that' the new lagoons were designed by KLM Engineering and will be lined by ~ locally-obtained clay rather than paved, resulting in a major sav- ing in the overall cost of the pro- ject. _ According to Hinde Engineer- ing, who designed the Aqua-Air’ system, it is based on the natural treatment of wastes in which the: . rolling action of a stream cir- | culates wastes between the bot- tom and surface, adding oxygen Chinese & Western Cuisine Mon,—Thurs. 10:30 a.m. — midnight Fri. & Sat. 10:30 a.m. — 1 a.m. : sunday 12:00 a.m. — 10 p.m. _ For take-out orders call: - 638-1848 o 638- 8034: by. photosynthesis ‘arid. surface absorption, and quickly oxidiz- . ‘Natural: breakdown process _ This heat changer and the. associated cosi8 of its operation and. maintenance will be eliminated with the construction of Terrace’s new $1.6 million sewage treatment plant, scheduled for completion in October. The. exchanger is. presently used to heat effluent to 100 degrees Fahrenheit - before it Is pumped into the primary ulpester. ing wastes into'carbon dioxide, j= = water and small amounts of i ins B. ert ash. - Hinde Engnneering says their ‘patented Air-Aqua system dup- MARTIN SHORT - $teve: mati licates this natural process, and: Li air is introduced artificially from ff _ valved tubing laid in.a parallel = | pattern across the lagoons. Fine. bubbles emitted from: ° each line of the aerating tubing. form a continuous stream of gently rising air which acts as a hydraulic barrier to-hold water behind it, turning it over and over before passing through the. barrier to the next cell. Aeration 9. : continues in each cell and a large volume of oxygen is dissolved in”~ the water, reducing aerobically suspended solids to carbon diox- ide and water; > The. shape of, each valve pro- vides very. fine bubbles which in- crease oxygen absorption effec. tively, and a ‘Slight pressure pro- ‘THE RUSH Certificates expire Oct. 31, 1987 Come in and book your} now to portrait] jappointment . have your taken. Sports pictures are now Teady to be picked up!. See Your Photographer ~Ken’s Photo — Terrace — 4617 Lakelse Avenue 638-1464 a continued on page 19 7 | "Ay LA, FILWS/LORNE WICHABLS Prodacton A LANDIS/FOLSEY Film iTHREE AMIGOS! ALFONSO ARAD TOKY PLANA PATRICE MARTINE? Songs by RANDY NEWMAN Score by ELWER BERSTEIH Executive Prodacer STEVE MARTIN. Writlen by STEVE MARTIN - LORNE MICHKELS ~ RANDY HEWMAN .— Prodied by LORNE MICHAELS and GEORGE FOLSEY, JR. Directed by JOHN LANDIS PERO snore ne Asc Wid BOX OFFICE Video Station TERRACE 635-6121 THORNHILL 635-4841 KITIMAT 632-4825 PRINCE RUPERT 624-2221]