On Site wastewater Treatment for Reuse

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Ashrafnezhad Meygoli, Mohammad | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 46619 (03)
University: Sharif University of Technology
Department: Chemistry
Advisor(s): Hashemian, Jamaloddin; Saidi, Mohammad Reza; Mirzai, Mohamad
Abstract:
With the aim of making a pilot in two-steps, this thesis at 4 month accomplished. In first step, municipal sewage after passing of a septic tank loaded with daily 2 or 4m3/m2 rate to a vermi-filter while removal rate of COD was 83 and 64 percent respectively. In addition, the turbidity removal rate was 92 and 83 percent respectively. The results showed that vermi-filter is a suitable and cheap way for on-site wastewater treatment that is environmentally agreeable and odorless. Furthermore, the treated sewage is suitable for irrigate and flush tank usage. In the second step, for ground water denitrification, a synthetic wastewater with high nitrate, which nitrate is initially 13.5ppm NO3-N and then increased to 30ppm NO3-N and COD was in the range of 200-500 ppm, was made and loaded with daily 2m3/m2 rate to vermi-filter. The removal rate of 86 percent for COD is resulted. In addition, the nitrate (NO3-N) removal rate is 56 percent. Thus with the aim of vermi-filter, synchronous sewage treatment and groundwater denitrification is available, but nitrate removal rate is moderate and it is necessary to take measures to increase the percentage of nitrate removal
Keywords:
Municipal Wastewater Treatment ; Nitrate Removal ; Vermi Filter ; Earth Worm ; Aquifer Recharge

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