Deciphering the effect of light intensity on microalgal-bacterial granular sludge process for non-aerated municipal wastewater treatment

2021 ◽  
Vol 58 ◽  
pp. 102437
Author(s):  
Siqi Fan ◽  
Lin Zhu ◽  
Bin Ji
Keyword(s):  
Wastewater Treatment ◽  
Light Intensity ◽  
Municipal Wastewater ◽  
Granular Sludge ◽  
Municipal Wastewater Treatment ◽  
Effect Of Light

scholarly journals Microalgal-Bacterial Granular Sludge Process in Non-Aerated Municipal Wastewater Treatment under Natural Day-Night Conditions: Performance and Microbial Community

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1479
Author(s):  
Shulian Wang ◽  
Lin Zhu ◽  
Bin Ji ◽  
Huan Hou ◽  
Yingqun Ma
Keyword(s):  
Wastewater Treatment ◽  
Relative Abundance ◽  
Municipal Wastewater ◽  
Engineering Application ◽  
Granular Sludge ◽  
System Stability ◽  
Municipal Wastewater Treatment ◽  
Treatment Technology ◽  
Filamentous Microorganisms ◽  
Removal Efficiencies

The microalgal-bacterial granular sludge (MBGS) process is expected to meet the future requirements of municipal wastewater treatment technology for decontamination, energy consumption, carbon emission and resource recovery. However, little research on the performance of the MBGS process in outdoor treatment was reported. This study investigated the performance of the MBGS system in treating municipal wastewater under natural alternate day and night conditions in late autumn. The results showed that the average removal efficiencies of Chemical oxygen demand (COD), NH4+-N and PO43−-P on daytime before cooling (stage I, day 1−4) could reach 59.9% ± 6.8%, 78.1% ± 7.9% and 61.5% ± 4.5%, respectively, while the corresponding average removal efficiencies at night were 47.6% ± 8.0%, 56.5% ± 17.9% and 74.2% ± 7.6%, respectively. Due to the dramatic changes in environmental temperature and light intensity, the microbial biomass and system stability was affected with fluctuation in COD and PO43−-P removal. In addition, the relative abundance of filamentous microorganisms (i.e., Clostridia and Anaerolineae) decreased, while Chlorella maintained a dominant position in the eukaryotic community (i.e., relative abundance > 99%). This study can provide a theoretical basis and technical support for the further engineering application of the MBGS process.

Перспективная технология очистки коммунальных сточных вод гранулированными илами

2019 ◽  
pp. 34-44
Author(s):  
M. Kevbrina ◽  
A. Akmentina ◽  
A. Dorofeev ◽  
A. Agarev ◽  
V. Aseeva ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Biological Treatment ◽  
Municipal Wastewater ◽  
Batch Reactor ◽  
Granular Sludge ◽  
Aeration Tank ◽  
Municipal Wastewater Treatment ◽  
Treatment Technology ◽  
Maximum Permissible Concentrations

Увеличение удельной биохимической мощности сооружений с применением так называемых гранулированных активных илов является одним из перспективных направлений развития технологий биологической очистки сточных вод. Гранулированные илы это микробные биоценозы, специализирующиеся на разложении и минерализации веществ, содержащихся в сточных водах. Отличие от обычных илов обусловлено двумя важными факторами: строением основной структурной единицы гранулированного ила гранулы, и высокой скоростью осаждения (до 20 м/ч). Это позволяет создавать в биореакторах очистки сточных вод дозы ила до 10 г/л. Представлены результаты разработки первой в РФ биотехнологии очистки городских сточных вод с применением гранулированного активного ила. Технология реализована на объектах АО Мосводоканал . Технология аэробной биологической очистки в реакторе последовательнопериодического действия с последовательной нитриденитрификацией и восходящим потоком сточной воды позволяет обеспечить качество очищенной воды, соответствующее нормативам предельно допустимых концентраций для сброса в водоемы рыбохозяйственного назначения. Техникоэкономическое сравнение разработанной технологии с технологией удаления биогенных элементов в аэротенке проточного типа показало, что затраты жизненного цикла сооружений с частично гранулированным активным илом в 1,4 раза меньше затрат традиционной технологии биологической очистки (для производительности 1000 м3/сут).Increasing the specific biochemical capacity of the facilities using the socalled granular activated sludge is one of the promising areas for the development of biological wastewater treatment technologies. Granular sludge is microbial biocenosis specializing in the decomposition and mineralization of substances present in wastewater. The main distinction from regular sludge is due to two important factors: the composition of the basic structural unit of granular sludge granules, and a high sedimentation rate (up to 20 m/h). This provides for developing sludge doses of up to 10 g/l in bioreactors of wastewater treatment. The results of the development of the first biotechnology in Russia for municipal wastewater treatment of using granular activated sludge are presented. The technology has been implemented at the facilities of Mosvodokanal JSC. The technology of aerobic biological treatment in a sequencing batch reactor with sequential nitridenitrification and an upward flow of wastewater provides for the quality of effluent that meets the standards for maximum permissible concentrations for discharge into fishery bodies. Technical and economic comparison of the developed technology with the technology of removing nutrients in flowthrough aeration tank showed that the life cycle costs of the facilities with partially granulated activated sludge are 1.4 times less than the costs of traditional biological treatment technology (for a capacity of 1000 m3/day).

scholarly journals Aerobic granular biomass technology: advancements in design, applications and further developments

2017 ◽  
Vol 12 (4) ◽  
pp. 987-996 ◽  
Author(s):  
Mario Pronk ◽  
Andreas Giesen ◽  
Andrew Thompson ◽  
Struan Robertson ◽  
Mark van Loosdrecht
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Development Program ◽  
Granular Sludge ◽  
Full Scale ◽  
Aerobic Granular Sludge ◽  
Municipal Wastewater Treatment ◽  
Planning And Design ◽  
Granular Biomass ◽  
Under Construction

Abstract Aerobic granular sludge is seen as the future standard for industrial and municipal wastewater treatment. Through a Dutch research and development program, a full-scale aerobic granular biomass technology has been developed – the Nereda® technology – which has been implemented to treat municipal and industrial wastewater. The Nereda® system is considered to be the first aerobic granular sludge technology applied at full-scale and more than 40 municipal and industrial plants are now in operation or under construction worldwide. Further plants are in the planning and design phase, including plants with capacities exceeding 1 million PE. Data from operational plants confirm the system's advantages with regard to treatment performance, energy-efficiency and cost-effectiveness. In addition, a new possibility for extracting alginate-like exopolysaccharides (ALE) from aerobic granular sludge has emerged which could provide sustainable reuse opportunities. The case is therefore made for a shift away from the ‘activated sludge approach’ towards an ‘aerobic granular approach’, which would assist in addressing the challenges facing the wastewater treatment industry in Asia and beyond.

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