Strategy of cultivation of poly-phosphate accumulating organisms by increasing of natrium acetate concentration

U ovom radu praćen je rast i aktivnost organizama koji akumuliraju fosfor (PAO) u laboratorijskom SBR uređaju uzgajanih na sintetičkoj vodi različite koncentracije natrijeva acetata kao izvora ugljika. Pokus je proveden u ciklusima od 6h s izmjenom anaerobne i aerobne faze, a uvjeti rada bili su prilagođeni rastu PAO-a (prosječno T=13,2 °C i pH=8,1). Cilj rada je bio istražiti optimalne uvjete vođenja procesa za uzgoj aktivnog mulja s visokom učinkovitosti uklanjanja fosfora pri višim koncentracijama acetata, odnosno ispitati može li se postupnim povećanjem koncentracije natrijeva acetata prilagoditi aktivni mulj za rad na višim koncentracijama acetata. Tijekom pokusa praćeni su parametri poput uklanjanja ugljika, fosfora i dušika, a za ispitivanje biološke aktivnosti PAO-a provedeno je devet testiranja tijekom uzgoja. Rezultati su pokazali da visoke koncentracije acetata nemaju negativni utjecaj na rast i aktivnost PAO-a ako se proces obrade vode provodi u kratkim ciklusima u trajanju od 6 h, te da takav način vođenja procesa i postupno povećavanje koncentracije acetata dovodi do povećanja udjela PAO-a u aktivnom mulju i učinkovitosti uklanjanja fosfora. In this paper growth and activity of poly-phosphate accumulating organisms (PAO), in a laboratory SBR on synthetic wastewater and with different sodium acetate concentration as a carbon source, were observed. Experiment was conducted in 6 h treatment aerobic/anaerobic cycles with adjusted conditions to promote the growth of PAO (average t=13,2 °C, pH=8.1). The aim of this work was to investigate the optimal process managing conditions for activated sludge cultivation with high efficiency of phosphorus removal at higher acetate concentrations, and to investigate whether the activated sludge can be adjusted to work at higher acetate concentrations by a gradual increase in sodium acetate concentration. During the experiment, parameters such as carbon, phosphorus and nitrogen removal were monitored and nine tests of biological activity of PAO were performed. The results showed that high acetate concentrations will not have a negative influence on PAO activity in short water treatment process cycles that last up to 6 h, and that such a method of managing the process and gradually increasing acetate concentration leads to an increase in PAO's in activated sludge and phosphorus removal efficiency.