Loading...

Investigation of Nutrient Removal in BNR Systems Based on Bardenpho Process

Banayan Esfahani, Ehsan | 2016

797 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49371 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Borghei, Mehdi
  7. Abstract:
  8. Large amounts of Nitrogen and Phosphorous in municipal and industrial wastewater result in Eutrophication and many diseases in human. Nowadays, various methods have been used to remove Nitrogen and Phosphorous from wastewater. Besides Physical and Chemical methods, Biological approaches are utilized based on Biological Nutrient Removal (BNR) Systems. One of the most important and practical processes of these systems is Modified Bardenpho, which contain 5 stages and used for Nitrogen and Phosphorous Removal with high efficiency. In this thesis, we used Modified Bardenpho Process for removing nutrients. This method has 5 Moving Bed Biofilm Reactor (MBBR) which are respectively, anaerobic reactor, 1st anoxic reactor, 1st aerobic reactor, 2nd anoxic reactor, 2nd aerobic reactor. At first, Hydraulic Retention Time (HRT) of stated reactors were optimized, and we concluded that HRT of anaerobic reactor, 1st anoxic reactor, 1st aerobic reactor, 2nd anoxic reactor, 2nd aerobic reactor are respectively, 2.2, 4.5, 12, 2.8, 1.1 hr. In these HRTs COD, Total Nitrogen (TN) and Total Phosphorous (TP) removal efficiency are respectively, 98.8%, 80.8% and 82.4%. Secondly, optimization of feeding model among direct and step feed methods was investigated. Then, we found out that direct feeding, in which all of the wastewater enter in 1st reactor or anaerobic reactor, is the best method of feeding. In addition, optimum recycling ratio from 1st aerobic reactor to 1st anoxic reactor was studied, and we determined that the best recycling ration is 3. In which, COD, TN and TP removal efficiency are respectively 97.5%, 88.8% and 88%. In the next step, Detergent effects on biological nutrient removal and the ability of Bardenpho process in detergent removal was examined. The presence of detergent in wastewater is considered as an inhibitor factor for Nitrogen removal which cause that nitrogen removal efficiency decrease to 78%. In addition, we could remove detergent by Bardenpho process up to 90% and we concluded that by increasing in detergent concentration in wastewater, detergent removal efficiency enhanced. At last, the amount of attached and suspended microorganisms in all reactors was measured
  9. Keywords:
  10. Moving Bed Biofilm Reactor (MBBR) ; Biological Nitrogen Removal ; Bardenpho Process ; Modified Bardenpho Process ; Biological Nutrient Removals (BNR)

 Digital Object List

 Bookmark

No TOC