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Možnosti zlepšení kvality vody v chovu ryb pomocí plovoucích mokřadů - přehledová studie
JINDRA, Tomáš
The bachelor thesis deals with the technology of floating wetlands, which construction could lead to improvement of water quality in fishponds. The aim of the thesis is to describe existing methods of water purification using wetlands with surface and subsurface water flow (root treatment plants). Further, to describe the method of refining in biological treatment reservoirs. One of the main chapters describes the construction of an artificial floating wetland. The cost / function ratio is often emphasized in their construction. However, it is important to mention that not all materials have a positive effect on water quality such as artificial materials. If possible, natural biodegradable materials that are environmentally friendly and often easier to handle with should be preferred. In addition, they are able to decompose in the environment and this can also save the cost of their disposal. In the thesis, a list of suitable wetland plants is proposed, focusing on species that are capable of growth and survival in our climatic conditions. The choice of species also depends on the type of habitat. Due to the low water transparency in fishponds, emergent and floating plant species, such as common reed (Phragmites australis), reed canary grass (Phalaris arundinacea), cattail (Typha spp.), branched bur-reed (Sparganium erectum) and duckweed (Lemna spp.), could be suitable. Nowadays, fishponds are in unsustainable conditions and water quality may become a limiting factor in fish production in the future. Floating wetlands may play an important role in its improvement.
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Evaluation of treatment efficiency of selected constructed wetlands
Houška, Vojtěch ; Vymazal, Jan (advisor) ; Dvořáková Březinová, Tereza (referee)
Constructed wetlands represent a suitable alternative for wastewater treatment nowadays. They are irreplaceable in Czech Republic as well as worldwide. Initially, they were not accepted unanimously by the water authorities due to the simple technological design.
In this Bachelor thesis, the main types constructed wetlands for wastewater treatment, their general principle of cleaning and suitable wetland vegetation are described. Also, the main components of pollution in the waste water are evaluated in the thesis. The thesis provides an evaluation of treatment performance of five constructed wetlands, namely Spálené Poříčí, Olší nad Oslavou, Rudíkov, Osová Bitýška and Křoví. This thesis is focused on the evaluation of the long-term treatment efficiency in terms of BOD5, COD, suspended solids, ammonia nitrogen and phosphorus. The most results show a very good level of wastewater treatment of surveyed constructed wetlands.
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