June 2018 Pipeline

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weeks, the WWTP Operators continued to pump out the trench on a regular basis, as dewatering continued well after the Lambourne crews had left. What do we do with them now? Well, as pointed out, they can be used again with little prep work to remove more sludge if desired. If left alone, and the solids are allowed to dry, there are different ways to dispose of the material. any seepage, a poly liner was put in place under the Geotubes as they were unrolled. A collection sump was dug at the northeast corner of the laydown area so that all decanted water could be easily pumped back into the lagoon. It had been determined during the initial survey that the City would need 6 Geotubes, each 30m long x 11m in diameter. The Lambourne crew arrived on September 18th and lowered the dredge into the lagoon. Once all the pipe connections had been made and the polymer trailer was prepped, pumping began on September 21st. It was essential that the dredge not get too close to the WAS (waste activated sludge) line that runs out approximately 50 m into the lagoon. Damage to this pipe could be disastrous in the ability to pump the WAS to the lagoon at all. The dredge ran along a cable secured on both sides of the lagoon, enabling the machine to stay true and not allow doubling up on areas that had already been pumped. Two separate crews ran 12 hour shifts as a delay at their previous job had put them slightly behind schedule. Fortunately the mild weather held well into October and work was done in plenty of time to avoid winter temperatures. Two Geotubes were filled in succession, that meaning as one was “Once the biosolids have rested for a period of time, the Geotubes® are cut open and the dried material can be taken away and disposed. The Geotubes® can be left for as long as needed, even several years. Once the material is dried, landfills receive this dried product, as it will pass their paint-filter test requirement and can be used as top cover.” www.lambourne.ca/what-we-do/lagoon-desludging/dewatering/ filled to capacity, a second began filling as the first dewatered and slowly shrank in size. Then once the second was filled, the first was topped up. This was repeated several times until it was almost entirely sludge that filled the Geotubes. Once two were filled, the next two were filled, and so on until all six Geotubes were filled to capacity. During the month the sludge was being pumped, the Lambourne operators took several samples from the Geotubes to confirm that the quality was as expected. After 21 days (with several small shutdowns) the dredge had pumped 45,668 cubic meters of sludge from the lagoon cell, and all six Geotubes were full. The estimated removal was approximately 913 dry tonnes of biosolids. By the time the last Geotube was filled, the first two had shrunk in size considerably due to effective dewatering. This reduction in tube size allows the same vessels to be reused at a time in the future if further dewatering is required. Each of the six units may have another 1/3 of their original space filled and dewatered will little or no prep work at all. Over the course of the next few It has been suggested that if the sludge is stabilized during its curing process, it can be added to compost and used as a soil conditioner due to its high organic content. As far as the City of Swift Current is concerned, further testing needs to be done before any decision can be made as to the use of the biosolids. After approximately 10 months, a core sample will be taken and analyzed for pathogens and nutrient quality. If no conclusive results are found, then the solids can remain in the Geotubes to dewater further. This began as a short term solution, and in reality is the first step in solving a bigger issue. But the first step has been taken, what the next step will be remains to be seen. Stay tuned. Tim Cox, Superintendent WWTP Swift Current, Saskatchewan What do we do with them now?
Tyler Klath Cell: (306) 203-3800 TF: 1-888-554-0638 tyler@ahmcelroy.com A.H. McElroy Sales & Service (Canada) Ltd. Saskatchewan, Manitoba and Nunavut Website: www.ahmcelroy.com Since 1958 Trevor Eden Western Canada Territory Manager trevor.eden@robar.ca ROBAR INDUSTRIES LTD. 12945 - 78th Ave, Surrey, BC Canada V3W 2X8 Tel 604.591.8811 Cell 778.836.7490 1.800.663.6553 Fax 604.591.5288 1.800.665.6553 www.robarindustries.com Providing Complete Solutions for Water & Wastewater Challenges Dillon Petrucha, Technical Sales Manager Phone: 306-231-3688 Toll-Free: 1-855-682-6125 E: dpetrucha@sapphire-water.ca Box 3615 Highway #20 North Humboldt, SK S0K 2A0 www.sapphire-water.ca epgsaskatoon@EPGPipe.com Engineered Pipe Group www.hdpe.ca HDPE PIPE, VALVES & FITTINGS WATER TREATMENT, GEOTEXTILE & EROSION CONTROL PRODUCTS FUSION EQUIPMENT & TECHNICIAN SERVICES 17 Wurtz Avenue Saskatoon, SK S7K 3J7 Phone: (306) 931-2900 Fax: (306) 931-0037 ADVERTISING • CRITICAL INFRASTRUCTURE PROTECTION (CIP) Electro-mechanical High Security ABLOY CANADA INC. an ASSA ABLOY Group Brand 800-465-5761 info@abloy.ca abloy.ca
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