The Engineering of Microalgae Mass Cultures for Treatment of Agricultural Wastewater, With Special Emphasis on Selenium Removal from Drainage Waters

In the framework of agricultural wastewater reuse, the W.H.O. has defined a parasitological quality for sewage with less than one nematode egg per liter. The purpose of this work is to define an effective method to detect helminth eggs in wastewater. Seven techniques have been applied to waste water analysis, with a comparison of their respective results, varying from 26 to 74 %. Be it in the framework of artificial contamination or on site, the best results were obtained with the diphasic technique perfected at the laboratory including a treatment with antiformine at 8 % + ethylacetate followed by a flotation with zinc sulphate at 55%. The validation in the laboratory of the methods performance on treated wastewater allowed us to show that the yield of the method is significantly independent of the egg concentration as well as giving good homogeneity of results with a concentration of 1 egg/litre.

Download Full-text

Mathematical Modeling of Biological Selenium Removal from Flue Gas Desulfurization (FGD) Wastewater Treatment

Proceedings of the Water Environment Federation ◽

10.2175/193864716819706770 ◽

2016 ◽

Vol 2016 (11) ◽

pp. 228-248 ◽

Cited By ~ 1

Author(s):

Mehran Andalib ◽

Sara Arabi ◽

Peter Dold ◽

Christopher Bye

Keyword(s):

Mathematical Modeling ◽

Wastewater Treatment ◽

Flue Gas ◽

Flue Gas Desulfurization ◽

Selenium Removal

Download Full-text

Advances in Circular Bioeconomy Technologies: From Agricultural Wastewater to Value-Added Resources

Environments ◽

10.3390/environments8030020 ◽

2021 ◽

Vol 8 (3) ◽

pp. 20

Author(s):

Nidhi Mehta ◽

Kinjal J Shah ◽

Yu-I Lin ◽

Yongjun Sun ◽

Shu-Yuan Pan

Keyword(s):

Membrane Separation ◽

Value Added ◽

Fulvic Acids ◽

Chemical Precipitation ◽

Environmental Benefits ◽

Nitrogen And Phosphorus ◽

Piggery Wastewater ◽

Agricultural Wastewater ◽

Treatment Processes ◽

Electrokinetic Separation

This review systematically outlines the recent advances in the application of circular bioeconomy technologies for converting agricultural wastewater to value-added resources. The properties and applications of the value-added products from agricultural wastewater are first summarized. Various types of agricultural wastewater, such as piggery wastewater and digestate from anaerobic digestion, are focused on. Next, different types of circular technologies for recovery of humic substances (e.g., humin, humic acids and fulvic acids) and nutrients (e.g., nitrogen and phosphorus) from agricultural wastewater are reviewed and discussed. Advanced technologies, such as chemical precipitation, membrane separation and electrokinetic separation, are evaluated. The environmental benefits of the circular technologies compared to conventional wastewater treatment processes are also addressed. Lastly, the perspectives and prospects of the circular technologies for agricultural wastewater are provided.

Download Full-text

Diffuse Water Pollution from Agriculture: A Review of Nature-Based Solutions for Nitrogen Removal and Recovery

Water ◽

10.3390/w13141893 ◽

2021 ◽

Vol 13 (14) ◽

pp. 1893

Author(s):

Giuseppe Mancuso ◽

Grazia Federica Bencresciuto ◽

Stevo Lavrnić ◽

Attilio Toscano

Keyword(s):

Water Pollution ◽

Nitrogen Removal ◽

Plant Uptake ◽

Environmental Issues ◽

Polluted Water ◽

Health Issues ◽

Agricultural Wastewater ◽

Research Activities ◽

Wide Range ◽

Different Types

The implementation of nature-based solutions (NBSs) can be a suitable and sustainable approach to coping with environmental issues related to diffuse water pollution from agriculture. NBSs exploit natural mitigation processes that can promote the removal of different contaminants from agricultural wastewater, and they can also enable the recovery of otherwise lost resources (i.e., nutrients). Among these, nitrogen impacts different ecosystems, resulting in serious environmental and human health issues. Recent research activities have investigated the capability of NBS to remove nitrogen from polluted water. However, the regulating mechanisms for nitrogen removal can be complex, since a wide range of decontamination pathways, such as plant uptake, microbial degradation, substrate adsorption and filtration, precipitation, sedimentation, and volatilization, can be involved. Investigating these processes is beneficial for the enhancement of the performance of NBSs. The present study provides a comprehensive review of factors that can influence nitrogen removal in different types of NBSs, and the possible strategies for nitrogen recovery that have been reported in the literature.

Download Full-text

Controlling of two destructive zooplanktonic predators in Chlorella mass culture with surfactants

Biotechnology for Biofuels ◽

10.1186/s13068-021-01873-6 ◽

2021 ◽

Vol 14 (1) ◽

Author(s):

Xiaobin Wen ◽

Aoqi Zhang ◽

Xiaoyan Zhu ◽

Lin Liang ◽

Yan Huo ◽

...

Keyword(s):

Mass Culture ◽

Chemical Method ◽

Sodium Dodecyl ◽

Sodium Dodecyl Benzene Sulfonate ◽

Biofuel Production ◽

Benzene Sulfonate ◽

Microalgae Biomass ◽

Mass Cultures ◽

Dodecyl Benzene Sulfonate ◽

Raceway Ponds

Abstract Background Predatory flagellates and ciliates are two common bio-contaminants which frequently cause biomass losses in Chlorella mass culture. Efficient and targeted ways are required to control these contaminations in Chlorella mass cultivation aiming for biofuel production especially. Results Five surfactants were tested for its ability to control bio-contaminations in Chlorella culture. All five surfactants were able to eliminate the contaminants at a proper concentration. Particularly the minimal effective concentrations of sodium dodecyl benzene sulfonate (SDBS) to completely eliminate Poterioochromonas sp. and Hemiurosomoida sp. were 8 and 10 mg L−1, respectively, yet the photosynthesis and viability of Chlorella was not significantly affected. These results were further validated in Chlorella mass cultures in 5, 20, and 200 m2 raceway ponds. Conclusions A chemical method using 10 mg L−1 SDBS as pesticide to control predatory flagellate or ciliate contamination in Chlorella mass culture was proposed. The method helps for a sustained microalgae biomass production and utilization, especially for biofuel production.

Download Full-text

Optimising the performance of a lab-scale tidal flow reed bed system treating agricultural wastewater

Water Science & Technology ◽

10.2166/wst.2004.0490 ◽

2004 ◽

Vol 50 (8) ◽

pp. 65-72 ◽

Cited By ~ 25

Author(s):

Y.Q. Zhao ◽

G. Sun ◽

C. Lafferty ◽

S.J. Allen

Keyword(s):

Tidal Flow ◽

High Strength ◽

Pollutant Removal ◽

Inorganic Pollutants ◽

Operational Conditions ◽

Agricultural Wastewater ◽

Major Route ◽

Reed Bed ◽

Ammoniacal Nitrogen Removal

A gravel-based tidal flow reed bed system was operated with three different strategies in order to investigate its optimal performance for the treatment of a high strength agricultural wastewater. According to the three strategies, individual reed beds were saturated and unsaturated with the wastewater for different periods while reasonably stable hydraulic and organic loadings were maintained. Experimental results demonstrated that the system produced the highest pollutant removal efficiencies with a relatively short saturated period and long unsaturated period, highlighting the importance of oxygen transfer into reed bed matrices during the treatment. Significant removals of some major organic and inorganic pollutants were achieved under all three operational conditions. Nitrification was not the major route of ammoniacal-nitrogen removal when the system was under high organic loading. Due to the filtration of suspended solids and the accumulation of biomass, gradual clogging of the reed bed matrices took place, which caused concerns over the long-term efficiency of the tidal flow system.

Download Full-text