Nitrogen removal options and underlying processes in piggery wastewater treatment | |
| Author | Pradhan, Shovana |
| Call Number | AIT Thesis no.EV-07-47 |
| Subject(s) | Swine--Housing--Waste disposal Sewage--Purification--Nitrogen removal |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Environment Engineering and Management |
| Publisher | Asian Institute of Technology |
| Abstract | The study was carried out to find the removal efficiencies for the carbonaceous and the nitrogenous matters of the piggery wastewater in the lab scale in the Upflow Anoxic - Aerobic Floating Filter system with recirculation from the aerobic stage to the anoxic stage. The study was continuously operated for 192days at different organic loading rates with and without physico-chemical pretreatment stage. The study comprises of two parts: Part A and Part B. The part A comprised of physico-chemical treatment process in which the carbonaceous and nitrogenous matter removal efficiencies of the piggery wastewater was analyzed by the coagulation / flocculation process by using different types of coagulants in the jar test. Various coagulants such as Aluminium Sulfate (Al2(SO4)3), Poly Aluminium Chloride (PAC), Ferric Chloride (FeCl3), Ferric Sulfate (Fe2 (SO4)3), and Ferrous Sulfate (FeSO4) were used. In Part B, the study was carried out to find the removal efficiencies of the carbonaceous and nitrogenous matters of the system at different phases. In the first phase, when the system was operated at low organic loading rate of 3.18kg COD/m3 day, overall removal efficiencies were 90% for COD, 60% for total nitrogen (TN), 59% of ammonia nitrogen (NH3-N). In the second phase, when the system was operated with high organic loading rate of 12.28 kgCOD/m3 filter day, the overall removal efficiencies for COD, TN and NH3-N were 83%, 36% and 13%, respectively. In the third phase, the study was carried out by operating the system with the Zeolite pretreatment stage. Zeolite was used because of its well known capacity for ammonia adsorption. The Zeolite pretreated wastewater was used as the substrate for the system. With the pretreatment stage, the overall removal efficiencies of the system for COD, TN and NH3-N were 97%, 67% and 65%, respectively. As the COD concentration varied to maintain the OLR, the TN loading rates to the reactor also varied. At low OLR, total nitrogen loading was 0.39 kgTN/m3 day. The TN loading rate increased to 0.60 kgTN/m3 filter day as the OLR increased. With the zeolite pretreatment stage, the TN loading rate to the reactor decreased to 0.44 kgTN/m3 day. Fluorescence In Situ Hybridization (FISH) was performed to study the nitrogen transforming microbial community and its variations at three different phases in the anoxic and aerobic reactor. The study was carried out to find the abundance of a- , B- and y- subclass of Proteobacteria in the anoxic and aerobic floating filters. The study showed diverse group of microorganisms involving in the process. Changes in operational parameters allowed following the behavior of the microbial communities |
| Year | 2007 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Shipin, Oleg V.; |
| Examination Committee(s) | Annachhatre, Ajit P;Visvanathan, C; |
| Scholarship Donor(s) | NORWAY; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2007 |