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Field Performance of a Mechanical Spray Evaporator in Wastewater Minimization & Disposal

Zamani Froutageh, Leili | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 49612 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Alamolhoda, Ali Asghar; Hashemian, Jamaledin
  7. Abstract:
  8. The mechanical spray evaporator (MSE) is a method of enhanced evaporation technology, normally designed to reduce the particle size of a wastewater droplet to volatilize water content of it as quickly as possible. A model of MSE has been built at the Institute of Water and Energy at Sharif University of technology. The aim of this research is to study the efficiency of enhanced evaporation technology for waste disposal. To achieve the accurate results, the required pumping rates and power consumption, sustained evaporation rates while operating the fans, and the performance during various temperature, wind speed and relative humidity, are required. Mechanical Spray Evaporator technique claims to increase the evaporation rate and achieve Zero Liquid Discharge for dry climate. In order to evaluate performance of the MSE system, a tank 1m*1.5m*0.8m was constructed and fitted next to the machine. One spiral nozzle was installed in the wind tunnel. The nozzles were sprayed at a flow rate of 3 cubic meter per hour. The result measuring parameters and sampling was done in the Institute of Water and Energy at the Sharif University of technology by standard instruments and parameters included: air temperature, Relative humidity, Electrical Conductivity (EC), flow rate, and energy evaporation. In this method, the amount of evaporation was determined by measuring the initial EC and amount of its increase. 97 runs were performed to evaluate test equipment and experimental procedures, adequacy of the surveyed grid system, and performance of container. The results indicated that average electrical conducting in spray fallback samples had increased of about 253 µS/cm comparing with the initial groundwater samples, because of increasing total dissolved solids in spray fallback. To determine the relationship between volume reduction and EC were performed, by measuring the evaporated water and the reduced volume, the EC and temperature was recorded at each stage the volume reduced 50 ml of 1000 ml groundwater sample was directly heated. Reviewing and comparing the field data, along with the result of laboratory experiment increase in the EC of approximately 255 units created by water volume reduction of about 650 ml was observed. Modifying fan angle, nozzle angle, and flow rate yielded an overall evaporation of about 60 percent of spray rate. Power consumption by the device was 5 kWh/kg evaporated water, energy consumption can be relatively similar to many other water evaporation methods. However, while considering the total water evaporated/energy consumption, including intake source, location, distance, regulation and quality, the power numbers can become quite competitive and perhaps even attractive. The fallback rate is the spray rate less the evaporation rate. If significant fallback is tolerable, an evaporation rate averaging about 34 liter per minute is estimated for operation under Tehran environment condition
  9. Keywords:
  10. Evaporation Pond ; Desalination ; Evaporators ; Industrial Sewage ; Brine Management ; Evaporal Ponds ; Mechanical Spray Evaporator (MSE)

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