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Unit viii

Lecture notes of Industrial Waste Treatment (Elective -III) as per syllabus of Solapur university for BE Civil
Prepared by
Prof S S Jahagirdar,
Associate Professor,
N K ORchid College of Engg and Tech,
Solapur

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Unit viii

  1. 1. UNIT- VII L-34 Acclamatization and Operation and Maintenance
  2. 2. Contents Acclimatization of bacteria to toxic wastes, Process Sensitivity, operation and maintenance requirements.
  3. 3. Acclimatization of bacteria The type of treatment for industrial waste is decided on BOD/COD ratio. BOD/COD ratio Type of treatment given > 0.6 Wastes are biologically treatable without acclimatization. 0.3 to 0.6 Wastes need acclimatization for biological treatment < 0.3 Wastes are treated by other methods
  4. 4. Acclimatization involves gradual exposure of the waste in increasing concentration to the seed or initial microbiological population, under controlled conditions.
  5. 5. Many processes in the chemical, pharmaceutical, plastic, petrochemical industries, etc., generate Waste Water which contains organic toxic compounds. The utilization of biological treatments is based on the capacity of microorganisms, specifically bacteria, to degrade a greatspecifically bacteria, to degrade a great quantity of toxic substances. The pollutants are treated as food by the bacteria and these, while feeding, increase their population at the same time as the water gets treated.
  6. 6. Due to its toxicity, biological treatment of Waste Water containing a toxic substrate is difficult, since the microorganisms are initially not able to treat that substance. Therefore, the first step to make a SBRTherefore, the first step to make a SBR (Sequential Batch Reactor) operative is the acclimatization, i.e., the adaptation of the microorganisms to a particular toxic substrate.
  7. 7. Acclimatization is commonly practiced in case of toxic wastes such as phenol, arsenic, cyanide etc. For example to treat a phenolic waste of 500 mg/lit. bacteria are exposed gradually from initial concentration of 20 mg/lit tofrom initial concentration of 20 mg/lit to 500 mg/lit Nutrients are also added to the waste in the form of urea, superphosphate or any other compound containing N and P
  8. 8. Operation and maintenance requirements a. Operations Waste water treatment plant operators should be trained person. The operation of wastewater treatment plant includesincludes 1. Putting unit processes and equipment in an out of the service. 2. Adjusting chemical feeds (dosages of chemicals). 3. Controlling the treatment process and monitoring efficiency.
  9. 9. Sewer system operation includes 1. Pumping stations 2. Control of pretreatment and flow monitoring to avoid sewer overflowsmonitoring to avoid sewer overflows All operations requires documentation, inspection during regular rounds for most wastewater treatment plants, operation 24- hr per day and 365 days per year.
  10. 10. Supervisory control and systems assists operators by monitoring equipment and reporting alarms at a single location. The control system may include as automaticThe control system may include as automatic dialer to notify on cal operators while facilities are unstaffed.
  11. 11. b. Maintainance Maintenance staff generally include general maintenance workers, electricians and laboures. Q and M staff may 1. lubricate equipment 2. Clean filters2. Clean filters 3. Perform routine tasks Maintenance staff responsible for Maintenance, inspection, troubleshooting and adjustment of various mechanical equipments such as pumps, gates, compressors, conveyors, isolating power, maintenance of analog and digital equipment.
  12. 12. Theory Questions Q1. Write short notes on 1. Acclimatization of bacteria 2. Operation and maintenance of ETPs

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  • PrashanthBahubali

    Jul. 21, 2018

Lecture notes of Industrial Waste Treatment (Elective -III) as per syllabus of Solapur university for BE Civil Prepared by Prof S S Jahagirdar, Associate Professor, N K ORchid College of Engg and Tech, Solapur

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