Obrada sintetske otpadne vode u membranskom bioreaktoru

master's thesis

• Title (english): Treatment of synthetic wastewater in membrane bioreactor
• Author: Marina Poljak
• Mentor: Marin Matošić (mentor)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Food Engineering); Zagreb
• Defense date and country: 2007-03-07, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Biotechnology

Abstract

U radu je praćen rad membranskog bioreaktora s uronjenom pločastom membranom tvrtke Kubota. Proces je vođen kontinuirano tijekom 37 dana na sintetskoj otpadnoj vodi sastavljenoj od glukoze, peptona i amonijevog klorida. Kod ulazne vode koncentracije 270 mg/L TOC i 58 mg/L ukupnog dušika, učinkovitost uklanjanja organskih tvari bila je visoka i izražena kao % uklanjanja TOC-a iznosila 98%, KPK-a 96% i BPK5-a 98%. Pri takvim uvjetima primijećena je asimilacija dušika od 0,19 gN/gMLVSS. Asimilirano je 25% ulaznog dušika, a preostalih 75% je nitrificirano u nitrate. Povećanjem količine dodanog dušika za 50% došlo je do promjena u učinkovitosti uklanjanja organskih tvari. (TOC 90%, KPK 83% i BPK5 96%) te do poremećaja u nitrifikacijskoj aktivnosti zbog pada pH na 6,1. Prihranom bez dodanog ugljika i dušika došlo je do autolize stanica odnosno smanjivanju MLSS-a s 12,2476 g/L na 10,4478 g/L. Nitrifikacija dušika nastalog lizom i dalje je bila učinkovita. Permeabilnost membrane se kontinuirano smanjivala tijekom pokusa što ukazuje na začepljivanje membrane. Začepljivanje je bilo brže na početku procesa i pri promjeni uvjeta procesa kada dolazi do lize stanica.

Abstract (english)

During experiment the efficiency and stability of pilot-scale submerged plate and frame membrane bioreactor Kubota was investigated. Experiment was carried over a period of 37 days on synthetic wastewater based on glucose, peptone and ammonium chloride. With feed water concentrations of 270 mg/L TOC and 58 mg/l of total nitrogen, efficiency of organics removal was high and expressed as % of TOC removed was 98%, COD 96%, and BOD 98%. At these conditions good nitrogen assimilation of 0,19 gN/gMLVSS was observed. Assimilation of nitrogen was 25% of total nitrogen, and remaining 75% was nitrified in nitrats. Change in effluent quality by adding 50% more nitrogen, changes in removal efficiency of organic matter were observed (TOC 90%, COD 83%, and BOD 96%) nitrification was disturbed because of the drop in pH at 6,1. By adding just tap water without organic or nitrogen substances cell lysis was observed with drop in MLVSS from 12,2476 g/L to 10,4478 g/L. Nitrification of nitrogen relished by lysis was efficient. The membrane worked relatively stable with graduate decrease of permeability. Decrease of permeability was more pronounced on the beginning of experiment and during changes in effluent characteristic which caused cell lysis.

• Keywords: membranski bioreaktor; uronjene membrane; sintetska otpadna voda; začepljivanje
• Keywords (english): membrane bioreactor; submerged membrane; synthetic wastewater; membrane fouling
• Language: croatian
• URN:NBN: urn:nbn:hr:159:535339
• Study programme: Title: Food Technology; specializations in: Food Engineering; Course: Food Engineering; Study programme type: university; Study level: graduate; Academic / professional title: diplomirani inženjer prehrambene tehnologije; smjer prehrambeno inženjerstvo (diplomirani inženjer prehrambene tehnologije; smjer prehrambeno inženjerstvo)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-09-06 11:33:47