Identification of Physical, Morphological and Chemical Particularities of Mixed Microalgae - Bacteria Granules

Abstract

The growth of population has been linked with the increase usage of chemical compounds design for domestic and industrial use. At its turn, the increased amount of the chemical compound puts an enhanced stress on the environment. In such scenario, the waste management, including the wastewater treatment strategies have become an important part for the environmental protection. Unfortunately, the wastewater treatment procedures have several components which could be improved. Among them aeration process and biomass sedimentation have been the most stringent to tackle, since the aeration alone consume more than 60% from wastewater treatment energy cost. In this study, we proposed a new microalgae-bacteria activated sludge granule which could be an economical and technological solution to the above mentioned issues such as aeration and sedimentation. Moreover, during this study we characterized the physical, morphological and chemical characteristic of the newly formed granules by advances techniques such as electronic and correlative microscopy.

The Energy Efficiency of Domestic Wastewater Treatment Processes: Case Analysis

“…It has also been noted that consumers' energy consumption associated with biological stages (lines 6, 7 and 8 of Table 1) accounted for 67.9 % in January and 66.9 % in July of the total electricity consumed-values in good accordance with the value indicated in [32].…”

“…A special issue is the treatment of industrial wastewater, especially those from the leather industry [26], [27] (often with considerable heavy metal content [18]), the textile industry [28]- [31], etc. Usually, municipal and/or industrial wastewater treatment plants are provided with one or more biological steps towards the elimination of pollutants by their metabolism on biologically active sludge with high biodiversity [32]- [38]. As the biochemical processes are relatively slow, they practically establish the rate of the treatment processes (speed-limited kinetic phase) and thus the specific energy costs/consumptions of electricity related to the treatment.…”

“…As the biochemical processes are relatively slow, they practically establish the rate of the treatment processes (speed-limited kinetic phase) and thus the specific energy costs/consumptions of electricity related to the treatment. It was found that the share of energy costs related to the microbiological treatment stage is usually over 60 % of the total treatment costs [32]. In principle, the biological treatment steps can be accelerated using bio-activators [39].…”

The Factorial Analysis of the Activated Sludge Treatment Process Parameters

“…ultrafiltration polysulfone membranes with ZnO/TiO2 nanohybrid blending [12], biological filters [13], ultrafiltration pilot with polymeric membrane [14]). The characteristics of the aerobic sludge granules also influence the WWTP performance [15,16].…”

Kinetical Parameters Evaluation for Microalgae-Bacteria Granules used for Waste Water Treatment

“…The advantage of this microalgae-bacteria system has been represented by a better harvesting and less expensive aeration (reducing by 60% the energy costs) [12]. The intertrophic relationships between microalgae and bacteria have been the key for this biotechnological progress [13,14].…”