Flashing light alleviates photoinhibition and promotes biomass concentration in purple non- sulfur bacteria wastewater treatment

2021 ◽  
pp. 126107
Author(s):  
Haifeng Lu ◽  
Guangming Zhang ◽  
Changjie Wang ◽  
Ting Han ◽  
Ruihan Zhao ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Biomass Concentration ◽  
Sulfur Bacteria ◽  
Flashing Light

Determination of the Maintenance Requirements of Activated Sludge

1993 ◽  
Vol 28 (7) ◽  
pp. 139-142 ◽  
Author(s):  
J. Chang ◽  
P. Chudoba ◽  
B. Capdeville
Keyword(s):  
Wastewater Treatment ◽  
Process Development ◽  
Biomass Concentration ◽  
Growth Yield ◽  
Kinetic Studies ◽  
Initial Biomass Concentration ◽  
Aerobic Wastewater Treatment ◽  
Initial Substrate ◽  
Maintenance Requirements ◽  
The Cost

Maintenance energy plays an important role both in basic kinetic studies and in process development. Numerous studies have been devoted to the maintenance concept in various microbial fields but very few in biological wastewater treatment. Using a fermenter coupled to a mass spectrometer, we investigated the influence of the ratio So/Xo (ratio between initial substrate concentration and initial biomass concentration) on the observed sludge growth yield of an oxic-settling anaerobic (OSA) system. By measuring the substrate removed, the oxygen consumed and the carbon dioxide produced, we were able to estimate the substrate fraction used for maintenance purposes. The results indicate that at a high So/Xo ratio, a greater proportion of the substrate is devoted to maintenance thus significantly decreasing the observed growth yield. These findings are of particular importance in view of the cost associated with the disposal of excess sludge in aerobic wastewater treatment processes.

scholarly journals Sustainable production of bio-crude oil via hydrothermal liquefaction of symbiotically grown biomass of microalgae-bacteria coupled with effective wastewater treatment

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Gargi Goswami ◽  
Bidhu Bhusan Makut ◽  
Debasish Das
Keyword(s):  
Wastewater Treatment ◽  
Crude Oil ◽  
Paper Industry ◽  
Oil Quality ◽  
Biomass Concentration ◽  
Diesel Oil ◽  
Hydrothermal Liquefaction ◽  
Total Biomass ◽  
Wastewater Remediation ◽  
Batch Mode

Abstract The study demonstrates a sustainable process for production of bio-crude oil via hydrothermal liquefaction of microbial biomass generated through co-cultivation of microalgae and bacteria coupled with wastewater remediation. Biomass concentration and wastewater treatment efficiency of a tertiary consortium (two microalgae and two bacteria) was evaluated on four different wastewater samples. Total biomass concentration, total nitrogen and COD removal efficiency was found to be 3.17 g L−1, 99.95% and 95.16% respectively when consortium was grown using paper industry wastewater in a photobioreactor under batch mode. Biomass concentration was enhanced to 4.1 g L−1 through intermittent feeding of nitrogen source and phosphate. GC-MS and FTIR analysis of bio-crude oil indicates abundance of the hydrocarbon fraction and in turn, better oil quality. Maximum distillate fraction of 30.62% lies within the boiling point range of 200–300 °C depicting suitability of the bio-crude oil for conversion into diesel oil, jet fuel and fuel for stoves.

scholarly journals Assessing the degradation of ochratoxin a using a bioassay: the case of contaminated winery wastewater

2007 ◽  
Vol 56 (2) ◽  
pp. 55-61 ◽  
Author(s):  
R. Nogueira ◽  
I. Estevinho ◽  
L. Abrunhosa ◽  
C. Mendonça ◽  
P. Machado ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Microbial Activity ◽  
Ochratoxin A ◽  
Experimental Work ◽  
Biomass Concentration ◽  
Biological Degradation ◽  
Batch Experiments ◽  
Wastewater Treatment Systems ◽  
Conventional Wastewater Treatment

In vineyards the presence of certain fungi may lead to the production of the mycotoxin ochratoxin A (OTA) and subsequent contamination of grapes and wine. Furthermore, winery wastewaters contaminated with OTA may represent an environmental hazard. Therefore, it is imperative to assess the fate of this mycotoxin in conventional wastewater treatment systems. The aim of the present work was to assess the biological degradation of OTA. Experimental work was carried out in batch experiments with initial OTA to biomass concentration ratios of 1.4 μg mg−1, 7.4 μg mg−1 and, 11.9 μg mg−1. The assays were inoculated with activated sludge biomass unadapted to the substance under examination. The proposed bioassay demonstrates that OTA concentrations up to 100 μg L−1 can be degraded by microbial activity in activated sludge.

The Design, Operation and Performance of the New Membrane Bioreactor (MBR) WWTP for the Becket-Chimney Corners YMCA Camps in Western Massachusetts

2009 ◽  
Vol 4 (3) ◽  
Author(s):  
Nancy Oram Vigneault ◽  
Carsten Owerdieck
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Membrane Bioreactor ◽  
Treatment Plant ◽  
Biomass Concentration ◽  
Septic Systems ◽  
Separation Function ◽  
Conventional Activated Sludge ◽  
And Performance ◽  
Reclaim Water

The increasingly stringent requirements for effluent quality and the need to reclaim water are promoting the application of membrane bioreactor (MBR) systems for wastewater treatment. The membrane replaces the solids separation function carried out by the secondary clarifier and sand filter in a conventional activated sludge system. The MBR process effectively overcomes the problems associated with poor settling of sludge. In addition, the use of membranes permits the operation of the bioreactor at higher mixed liquor suspended solids (MLSS) concentrations of 8,000 to 12,000 milligrams per litre (mg/L) compared to a conventional system, which may operate between 2,000 to 4,000 mg/L. The elevated biomass concentration allows for improved removal of both soluble and particulate biodegradable material from the wastewater. The MBR design also reduces the area as well as the reactor volume required for treatment. Two-State YMCA operates Camp Chimney Corners and Camp Becket in Becket, Massachusetts. These two camps were under consent orders to address deficient septic systems and decided to construct a 40,000 gallons per day (151,400 litres/day) wastewater treatment plant and wastewater collection and conveyance system to address septic system problems. A MBR wastewater treatment plant was designed and constructed and began treating wastewater in May 2007. This paper presents the design, operation, and performance of the MBR WWTP.

Municipal wastewater treatment by a periodic biofilter with granular biomass

2008 ◽  
Vol 58 (12) ◽  
pp. 2395-2401 ◽  
Author(s):  
C. Di Iaconi ◽  
G. Del Moro ◽  
A. Lopez ◽  
M. De Sanctis ◽  
R. Ramadori
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Biomass Concentration ◽  
Municipal Wastewater Treatment ◽  
Hydraulic Residence Time ◽  
Microbial Composition ◽  
Start Up ◽  
Granular Biomass

The paper reports the results obtained during an experimental campaign aimed at transferring aerobic granulation to a demonstrative SBBGR system (i.e., a submerged biofilter that operates in a “fill and draw” mode) for the treatment of municipal wastewater by financial support of the European Commission, within the framework of Life-Environment Programme (PERBIOF Project; www.perbiof-europe.com). The results show that following the generation of granular biomass during the start-up period, the SBBGR was able to remove 80-90% of COD, total suspended solids and ammonia occurring in primary effluent from a municipal wastewater treatment plant even when the minimum hydraulic residence time (i.e., 4 h) was investigated. The process was characterised by a sludge production almost one magnitude order lower than commonly reported for conventional treatment plants. The granular biomass was characterised by a high density (i.e., 150 gTSS/Lbiomass) that allowed a biomass concentration as high as 35 kgTSS/m3bed to be achieved. Proteobacteria were found as main microbial components of the granular biomass by applying Fluorescence In Situ Hybridization (FISH). No significant changes in microbial composition were observed during reactor operation.

scholarly journals Influence of different anoxic time exposures on active biomass, protozoa and filamentous bacteria in activated sludge

2016 ◽  
Vol 74 (3) ◽  
pp. 595-605 ◽  
Author(s):  
S. Rodriguez-Perez ◽  
F. G. Fermoso ◽  
C. Arnaiz
Keyword(s):  
Wastewater Treatment ◽  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Biomass Production ◽  
Reduction Method ◽  
Wastewater Treatment Plants ◽  
Biomass Concentration ◽  
Sludge Reduction ◽  
Filamentous Bacteria ◽  
Active Biomass

Medium-sized wastewater treatment plants are considered too small to implement anaerobic digestion technologies and too large for extensive treatments. A promising option as a sewage sludge reduction method is the inclusion of anoxic time exposures. In the present study, three different anoxic time exposures of 12, 6 and 4 hours have been studied to reduce sewage sludge production. The best anoxic time exposure was observed under anoxic/oxic cycles of 6 hours, which reduced 29.63% of the biomass production compared with the oxic control conditions. The sludge under different anoxic time exposures, even with a lower active biomass concentration than the oxic control conditions, showed a much higher metabolic activity than the oxic control conditions. Microbiological results suggested that both protozoa density and abundance of filamentous bacteria decrease under anoxic time exposures compared to oxic control conditions. The anoxic time exposures 6/6 showed the highest reduction in both protozoa density, 37.5%, and abundance of filamentous bacteria, 41.1%, in comparison to the oxic control conditions. The groups of crawling ciliates, carnivorous ciliates and filamentous bacteria were highly influenced by the anoxic time exposures. Protozoa density and abundance of filamentous bacteria have been shown as promising bioindicators of biomass production reduction.

Application of a Hybrid Process with Biofilm and Suspended Biomass for Treating Petrochemical Wastewater

2010 ◽  
Vol 113-116 ◽  
pp. 469-473 ◽  
Author(s):  
Jing Bo Guo ◽  
Fang Ma ◽  
Chein Chi Chang ◽  
Li Wei
Keyword(s):  
Wastewater Treatment ◽  
Hybrid System ◽  
Biomass Concentration ◽  
Hybrid Process ◽  
Petrochemical Wastewater ◽  
Feasible Alternative ◽  
Suspended Biomass ◽  
Pollutants Removal ◽  
Biofilm Process ◽  
Refractory Organics

To improve the efficiency of petrochemical wastewater treatment, a hybrid system with both attached and suspended biomass was proposed to replace the existing biofilm process. According to the performances of the hybrid system, the optimal suspended biomass concentration in the tank was determined around 1000 mg/L. When the average influent COD and NH4+-N concentration were 395.7 mg/L and 13.5 mg/L, the according removal efficiencies of the hybrid system were up to 84% and 69%, compared to 74% and 20% when operated with the biofilm system. The GC-MS analysis showed that both the amounts and types of refractory organics in the effluent of hybrid system were greatly reduced when compared with those of the previous biofilm process. The foaming problem was also resolved along with the enhanced pollutants removal efficiency. The hybrid process was an economic and feasible alternative for petrochemical wastewater treatment, which ensured carbonaceous oxidation, nitrification and decomposition of refractory substances.

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