Microalgae cultivation under heterotrophic andphototrophic conditions for nutrient recoveryfrom wastewater
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- Tez No: 715944
- Danışmanlar: DR. MİLLER ALONSO CAMARGO-VALERO
- Tez Türü: Doktora
- Konular: İnşaat Mühendisliği, Civil Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2020
- Dil: İngilizce
- Üniversite: Unıversıty Of Leeds
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
Nutrients such as nitrogen and phosphorus are the most important elements for living species, as they are used to synthesise the main components of cells; however, they are also considered amongst the main pollutants responsible for adverse effects on aquatic environments (e.g., eutrophication). Current nutrient control technologies at wastewater treatment works rely heavily on bacterial processes for nitrogen and phosphorus removal. Although these processes are effective at removing nutrients, microalgae cultivation has shown considerable promise in this regard with the further benefit of achieving more stringent discharge levels and increasing overall sustainable resource management. This PhD research aims to optimise both phototrophic and heterotrophic cultivation of microalgae as an alternative means for nutrient control and recovery in sewage treatment works. Chlamydomonas reinhardtii was used as a model species due to its ability to grow under both phototrophic and heterotrophic conditions and common presence in wastewater pond treatment systems. With regard to algal growth kinetics studies, higher specific growth rates were achieved under heterotrophic conditions than under phototrophic cultivation. Nitrate was found as the preferred nitrogen source under both heterotrophic and phototrophic cultivation. Higher specific growth rates for heterotrophic and phototrophic microalgae were obtained at lower carbon concentrations. With regard to the optimisation of a two-stage biological process combining phototrophic and heterotrophic cultivation under continuous flow with biomass recycling, the optimum operational conditions were determined as 48 h of hydraulic retention time (HRT) and 14 d of cell retention time (CRT) when a mix of ammonium and nitrate was used; recovery efficiencies for phosphorus and nitrogen were 40.0 and 93.2%, respectively. Nitrogen and phosphorus content in harvested Chlamydomonas reinhardtii varied from 5.3 to 9.6% and from 0.6 to 1.2% of dry biomass, respectively, and depending on operational conditions. Overall, the proposed two-stage biological process exhibited considerable potential for implementation in large wastewater treatment works to achieve simultaneous nutrient control and recovery. In order to assess its potential, from the perspective of its technical feasibility, a mass flow analysis of nutrients was conducted by using Yorkshire Water's Esholt Wastewater Treatment Works as a case study
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