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Επεξεργασία υγρών αποβλήτων υψηλής περιεκτικότητας σε αμμωνία με χρήση ενθυλακωμένων μικροοργανισμών, με παράλληλη ανάκτηση θρεπτικών για παραγωγή φυτικής βιομάζας

Geronymakis Theodoros

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Year 2017
Type of Item Diploma Work
Bibliographic Citation Θεόδωρος Γερωνυμάκης, "Επεξεργασία υγρών αποβλήτων υψηλής περιεκτικότητας σε αμμωνία με χρήση ενθυλακωμένων μικροοργανισμών, με παράλληλη ανάκτηση θρεπτικών για παραγωγή φυτικής βιομάζας", Διπλωματική Εργασία, Σχολή Μηχανικών Περιβάλλοντος, Πολυτεχνείο Κρήτης, Χανιά, Ελλάς, 20
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The aim of this thesis is to create a system that will process high ammonia waste liquors, using the science and techniques of phyto-oxygenation and the process of nitrification with encapsulated biocatalysts. Also, the other goal is to recover the nutrients found in the liquid waste by converting it to plant biomass for further processing of it. The liquid waste will be purified by the consumption of nutrients from the plants and then the recovered components, in the form of plant biomass, will be processed accordingly for production of feed, compost, biodiesel etc. In the experimental part of the work urine was used as waste with high ammonia content (510mg / L). This system consists of a stabilization tank, which acts as the first wastewater collection tank but will also act as a reservoir in which urea hydrolysis will take place, depending on the waste, the available space and its content. Thereafter the liquid waste will be led to a nitrification bioreactor containing encapsulated Lentikats biocatalysts in order to fully nitrate the ammonia. Then, the nitrified waste will be fed to the tank / lake of floating plants, which contains plants such as E. Crassipes and S. Natans, plants known for their properties to extract much of the body's nutrients and rapid growth.Finally, after the corresponding 18days spent on the lake, the nitrified waste, which depends on the quality of the effluent required, the liquid waste will be collected for re-use, disposal or further processing. The plant biomass to be produced (40 gr / (day m2)) will be harvested by thinning the largest plantations, and depending on the plant and the plant site, the plant biomass produced will be processed accordingly.In experimental arrangements, the system was tested in two ways. When there is a large amount of urea in the waste, which is hydrolyzed and produces additional ammonia, it is chosen either to first allow hydrolysis to occur (4days) and then to provide a continuous flow (1,5L / day) and system operation ( Treactor = 1,7days), or without hydrolysis, the amount of waste entering the stabilizer tank determined by the bioreactor pH fluctuations (pH adjustment) to avoid ammonia accumulation in the bioreactor and possible system failures.The second technique can be used in both cases, either by hydrolysis of urea or without. However, continuous operation, without initial hydrolysis of urea, does not work properly as there is ammonia accumulation in the bioreactor. After the system has been operated and tested in the various situations, plant biomass production (40 gr / (day m2) will be recorded and ways of using it will be proposed, depending on the location of the system and the wastewater it processes. Flow charts of such an integrated system will also be created, as well as practical examples of their application with cost and equipment.In conclusion, completing the experimental procedures, it shows how economical, ecological and simple this system is. It is capable of treating waste with high concentrations of ammonia, giving a satisfactory effluent. It can be used alone for wastewater treatment with minimal operating costs and staffing requirements, or it can be integrated into an existing wastewater treatment plant to process a current. As nutrients recover from the waste, there is a positive parameter in the economics of the overall treatment of the waste and it provides economic benefit from the utilization of the produced plant biomass.

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