Use of immobilised bacteria for the wastewater treatment – examples from the sugar industry

Abstract

This work focuses on the implementation of high performance systems to the wastewater treatment of sugar factories. For this purpose, systems with immobilised bacteria were studied. For the hydrolysis of organic matter and denitrification, fluidized bed reactors were used. The nitrification was studied with an airlift reactor system. Both hydrolysis and nitrogen elimination were investigated on laboratory and pilot scales in sugar factories. Although with porous materials higher biomass concentrations are attainable for the hydrolysis (up to 55 kg/m3), for economical reasons sand was used (22.5 kg/m3) for the pilot scale-study. With a pilot-scale reactor (volume 1 m3) the maximum sucrose conversion rate achieved with sand in the first campaign was 52 kg/(m3 d). For the nitrogen elimination on the pilot scale, a system with denitrification and nitrification was combined. The highest performance for the nitrification (reactor volume: 0.68 m3) with pumice as support material was 1.2 kg NH4-N/(m3 d), limiting the whole system. The denitrification rate (reactor volume: 0.12 m3) was four times higher (3.5-5 kg NO3-N/(m3 d). Rules of the modelling of the system are discussed.

Bacterial growth dynamics and corresponding metabolite levels in the extraction area of an Austrian sugar beet factory using antimicrobial treatment

“…The press water sample contained 5.4 log 10 CFU mL −1 lactic acid bacteria (Fig. ), which is in line with other studies . However, individual heat resistance of the contaminants also should be considered …”

“…3), which is in line with other studies. 3,32 However, individual heat resistance of the contaminants also should be considered. 33,34 Application of a rosin acid-based additive Historically, different antimicrobial agents have been applied in beet sugar production to impede the undesired growth of microbial contaminants.…”

Physical Properties Evaluation of Porous Concrete according to Target Porosity and Pumice Contents Ratio for Application of the Aquatic Environment

“…따라서 효 과적인 수질정화성능을 가지면서 콘크리트 구조체로서의 소요강도를 동시에 만족하여야 한다. 콘크리트용 골재로 사 용 가능한 부석은 미생물 담체로서 활용하여 다양한 폐수에 서 혐기성 및 호기성 조건에서 우수한 처리효율을 나타내었 으며, [8][9][10][11][12] 생물반응조에서 생물막 및 미생물의 효율적인 증 가와 부착을 보여주었다. 13) 또한 바실러스 미생물의 내생포 자 형성에 필요한 미네랄인 SiO 2 가 주로 이루어져 있기 때문 에 미생물을 이용한 수처리 기능을 한 층 더 강화할 수 있으 며, [14][15] 부석표면에 음전하를 띠게 하여 중금속 등을 쉽게 흡 수하기 때문에 환경 분야에서 다양한 용도로 연구되었다.…”