20.500.12556/RUNG-3118-e7cb98c3-4bae-98d4-d02a-3e71f2c07c80
Mineralizacija odvečnega blata iz čistilnih naprav za komunalne odpadne vode s pomočjo ozonacije
Diplomsko delo
Mineralization of sewage sludge from waste water treatment plants for municipal waste water using ozonation
Thesis
Odvečno blato predstavlja veliko finančno breme, saj strošek odstranjevanja blata na čistilnih napravah predstavlja kar 50% do 60% celotne finančne porabe. V današnjem svetu poznamo in uporabljamo več različnih načinov in procesov, ki potrjeno zmanjšujejo odvečno blato nastalo med procesom čiščenja odpadnih voda. Eden izmed teh procesov je ozonacija. Za namene primerjave v raziskovalnem delu, se je najprej ozoniralo samo blato, nato se je postopek ozonacije integriral v proces čiščenja odpadne vode s šaržnim biološkim reaktorjem (SBR). Za ovrednotenje procesa smo analizirali parametre KPK, TN, TP, NO3--N in NH4+-N, z analizo sušin in žarin pa se je določila koncentracija blata in koncentracija hlapne snovi v blatu za oceno uspešnosti odstranjevanja blata. S samo ozonacijo smo uspeli doseči znižanje koncentracije blata za 60,7% pri dozi 80 g ozona/kg suhe snovi. Koncentracije KPK, TN in TP v supernatantu so se z višjo dozo ozona pričakovano povišale, saj slednji poškoduje celično steno celic v blatu, to pa povzroči da se znotrajcelične snovi razpustijo v supernatant. Točko preloma smo določili pri dozi 30 g ozona / kg suhe snovi, zaradi najvišjega skoka KPK ter sorazmerno nizkega in obvladljivega povečanja koncentracij TN in TP. Pri integraciji ozonacije v proces čiščenja odpadne vode smo dosegli 83% znižanje količine odvečnega blata, pri povprečni dozi 11,1 g ozona/kg suhe snovi blata. KPK, TN, TP, NO3-N in NH4-N so bili pri čiščenju odpadne vode na iztoku pod mejno vrednostjo za izpust. Največji problem je predstavljal TN zaradi velikega vpliva ozonacije na denitrifikacijo. Poraba energije za ozonacijo je znašala 453 kW h na tono dehidriranega blata, kar, po naših izračunih, znese 46,95 € po toni.
Excess sludge represents a major financial burden, because the cost of disposal of sludge at wastewater treatment plants can represent up to 50 % – 60 % of the total financial expenditure. Nowadays we use several certified methods and processes to reduce excess sludge generated during the process of wastewater treatment. One of these processes is ozonation. For the purpose of comparison in the research work, excess sludge was firstly ozonated in batch, then the process of ozonation was integrated in the process of wastewater treatment using a sequencing batch reactor (SBR). COD, TN, TP, NO3--N and NH4+-N were analyzed to evaluate process efficiency. Total and volatile solids concentrations were used to determine the concentration of the sludge and the efficiency of sludge degradation. With batch ozonation, we have achieved a 60.7 % reduction in the concentration of sludge with a dose of 80 g of ozone/kg of dry matter. The concentrations of COD, TN and TP in the supernatant were expectedly increased with higher doses of ozone, since they damage the sludge cell walls and this causes the intracellular substances to dissolve in the supernatant. The optimum point was determined at a dose of 30 g of ozone/kg of dry matter, due to the maximum increase of COD and relatively low and manageable increase in the concentrations of TN and TP. With the integration of ozonation into the SBR process of wastewater treatment, 83% of excess sludge degradation was achived, at an average dose of ozone of 11.1 g/kg total solids. In the wastewater effluent, COD, TN, TP, NO3-N and NH4-N concentrations were under the limit values for release into the environment. The largest problem represented TN concentration, because of a high impact of ozonation on denitrification. The energy consumption for ozonation was 453 kWh per tonne of dehydrated sludge, which according to our calculations amounts to 46,95 € per tonne.
Čiščenje odpadne vode
odvečno blato
ozon
ozonacija
mineralizacija blata
Wastewater treatment
excess sludge
ozone
ozonation
sludge mineralization
true
true
false
Slovenski jezik
Angleški jezik
Diplomsko delo
2017-06-14 09:26:02
2017-07-04 05:06:34
2023-06-09 03:20:36
0000-00-00 00:00:00
2017
0
Nova Gorica
0
0000-00-00
NiDoloceno
NiDoloceno
NiDoloceno
0000-00-00
0000-00-00
0000-00-00
4836603
URN:SI:UNG:REP:XVCIO0UR
Spela_Hudobivnik.pdf
Spela_Hudobivnik.pdf
1
704D94E4E30C523EEFA4BD88CECEA049
b97edbf9940ccaf0f80d75b48767a602d69b4b80c01f1ab4644f05420ef240d8
3273f73f-05ce-11ee-9c48-5ef991fed68f
https://repozitorij.ung.si/Dokument.php?lang=slv&id=10634
Fakulteta za znanosti o okolju
0
0
0