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Delta Treatment Systems • 9125 Comar Drive, Walker, LA 70785 • 1-800-219-9183 • www.deltatreatment.com6 INTRODUCTION 2. System not in use more than three months. Electrical power is turned off and there are no frost conditions. • Remove all materials and liquid from tank. • Refill with clean water. • Turn off air pump. 3. System not in use more than three months. Electrical power is on and there are no frost conditions. • Leave air pump on and system running; OR • Remove all material and liquid from tank. • Refill with clean water. 4. System not in use. Electrical power is turned off and there are frost conditions. • Remove all material and liquid from tank. • Turn off air pump. • If high groundwater is present, fill with clean water. • If no groundwater is present, leave tank empty. UNDER NO CIRCUMSTANCES SHOULD THE AIR PUMP BE TURNED OFF FOR MORE THAN A FEW DAYS WITHOUT REMOVING TANK CONTENTS SAMPLING REQUIREMENTS An ECOPOD-N Fixed Film Wastewater Treatment System properly operated and maintained should provide the following effluent quality of: Biochemical oxygen demand 5 day average (BOD5) of less than 30 mg/l (or ppm) Suspended solids of less than 30 mg/l (or ppm) Volatile Suspended solids of less than 30 mg/l (or ppm) pH of 6.0 to 9.0 Dissolved oxygen 1.5 to 3.0 mg/l (or ppm) Taking Effluent Sample Samples must be taken in the effluent discharge line or an effluent pump tank or after the disinfection device. We recommend allowing the effluent to flow through the discharge line for a minimum of 4 minutes before taking the sample. This will allow any solids to be flushed out that might have accumulated in the discharge pipe. Please see Figure 1 for reference. SAMPLES SHOULD BE TAKEN BY A LOCAL CERTIFIED TESTING LABORATORY. THE FOLLOWING RECOMMENDED GUIDELINES MAY BE USED IF LOCAL PROCEDURES ARE NOT AVAILABLE. Grab Samples: If analysis is begun within two hours of collection, cooling is unnecessary. If analysis is not started within two hours of sample collection, keep sample at or below 4˚C from the time of collection. Begin analysis within six hours of collection; when this is not possible because the sampling site is distant from the laboratory, store at or below 4˚C and report length and temperature of storage to the lab. In no case, start analysis more than 24 hours after grab sample collection. When samples are to be used for regulatory purposes, make every effort to deliver samples for analysis within six hours of collection. 1. Biochemical Oxygen Demand (BOD) Samples for BOD analysis may degrade significantly during storage between collection and analysis, resulting in low BOD values. Minimize reduction of BOD by analyzing the sample promptly or by cooling it to near freezing temperature during storage. However, even at low temperature, keep the holding time to a minimum. Warm the chilled samples to 20˚C before analysis; some storage time can be used to accomplish this conveniently. 2. Total Suspended Solids (TSS) Use resistant-glass or plastic bottles, provided that the material in suspension does not adhere to container walls. Begin analysis as soon as possible because of the impracticality of preserving the sample. Refrigerate sample at 4˚C to minimize microbiological decomposition of solids. 3. Ammonia Nitrogen Most reliable results are obtained from fresh samples. Destroy residual chlorine immediately after sample collection to prevent its reaction with ammonia. If prompt analysis is impossible, preserve samples with 0.8 mL concentration H2SO4/L sample and store at 4˚C. The pH of the acid- preserved samples should be between 1.5 and 2. Some wastewater may require more concentration H2SO4 to achieve this pH. If acid preservation is used, neutralize samples with NaOH or KOH immediately before making the determination.