Bacterra by Filterra Advanced Bioretention System: Discussion of the Benefits, Mechanisms, and Efficiencies for Bacteria Removal

2008 ◽  
Author(s):  
Larry S. Coffman ◽  
Mindy Ruby
Keyword(s):  
Bioretention System ◽  
Bacteria Removal

Effect of plants and filter materials on bacteria removal in pilot-scale constructed wetlands

2005 ◽  
Vol 39 (7) ◽  
pp. 1361-1373 ◽  
Author(s):  
Gabriela Vacca ◽  
Helmut Wand ◽  
Marcell Nikolausz ◽  
Peter Kuschk ◽  
Matthias Kästner
Keyword(s):  
Constructed Wetlands ◽  
Pilot Scale ◽  
Filter Materials ◽  
Bacteria Removal

Elimination of viruses, bacteria and protozoan oocysts by slow sand filtration

2004 ◽  
Vol 50 (1) ◽  
pp. 147-154 ◽  
Author(s):  
W.A.M. Hijnen ◽  
J.F. Schijven ◽  
P. Bonné ◽  
A. Visser ◽  
G.J. Medema
Keyword(s):  
Pilot Plant ◽  
Pathogenic Bacteria ◽  
Laboratory Experiments ◽  
Full Scale ◽  
Sand Filters ◽  
E Coli ◽  
Thermotolerant Coliforms ◽  
Filter Bed ◽  
Scale Data ◽  
Bacteria Removal

The decimal elimination capacity (DEC) of slow sand filters (SSF) for viruses, bacteria and oocysts of Cryptosporidium has been assessed from full-scale data and pilot plant and laboratory experiments. DEC for viruses calculated from experimental data with MS2-bacteriophages in the pilot plant filters was 1.5-2 log10. E. coli and thermotolerant coliforms (Coli44) were removed at full-scale and in the pilot plant with 2-3 log10. At full-scale, Campylobacter bacteria removal was 1 log10 more than removal of Coli44, which indicated that Coli44 was a conservative surrogate for these pathogenic bacteria. Laboratory experiments with sand columns showed 2-3 and >5-6 log10 removal of spiked spores of sulphite-reducing clostridia (SSRC; C. perfringens) and oocysts of Cryptosporidium respectively. Consequently, SSRC was not a good surrogate to quantify oocyst removal by SSF. Removal of indigenous SSRC by full-scale filters was less efficient than observed in the laboratory columns, probably due to continuous loading of these filter beds with spores, accumulation and retarded transport. It remains to be investigated if this also applies to oocyst removal by SSF. The results additionally showed that the schmutzdecke and accumulation of (in)organic charged compounds in the sand increased the elimination of microorganisms. Removal of the schmutzdecke reduced DEC for bacteria by ±2 log10, but did not affect removal of phages. This clearly indicated that, besides biological activity, both straining and adsorption were important removal mechanisms in the filter bed for microorganisms larger than viruses.

scholarly journals Importance of the Submerged Zone during Dry Periods to Nitrogen Removal in a Bioretention System

2020 ◽  
Author(s):  
Kangmao He ◽  
Huapeng Qin ◽  
Fan Wang ◽  
Wei Ding ◽  
Yixiang Yin
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Early Stage ◽  
Nitrogen Concentration ◽  
Rainfall Amount ◽  
Dry Period ◽  
Upward Trend ◽  
Bioretention System ◽  
N Removal ◽  
Exponential Decline

Adding a submerged zone (SZ) is deemed to promote denitrification during dry periods and thus improve NO3--N removal efficiency of a bioretention system. However, few studies had investigated the variation of nitrogen concentration in the SZ during dry periods and evaluated the effect of the variation on nitrogen removal of the bioretention system. Based on the experiment in a mesocosm bioretetion system with SZ, this study investigated the variation of nitrogen concentration of the system under 17 consecutive cycles of wet and dry alternation with varied rainfall amount, influent nitrogen concentration and antecedent dry periods (ADP). The results indicated that (1) during the dry periods, NH4+-N concentrations in SZ showed an exponential decline trend, decreasing by 50% in 12.9 ± 7.3 hours; while NO3--N concentrations showed an inverse S-shape decline trend, decreasing by 50% in 18.8 ± 6.4 hours; (2) during the wet periods, NO3--N concentration in the effluent showed an S-shape upward trend; and at the early stage of the wet periods, the concentration was relatively low and significantly correlated with ADP, while the corresponding volume of the effluent was significantly correlated with the SZ depth; (3) in the whole experiment, the contribution of nitrogen decrease in SZ during dry periods to NH4+-N and NO3--N removal accounted for 12% and 92%, respectively; and the decrease of NO3--N in SZ during the dry period was correlated with the influent concentration in the wet period and the length of the dry period.

Nitrogen process in stormwater bioretention: The impact of alternate drying and rewetting on nitrogen migration and transformation

2021 ◽  
Author(s):  
Yao Chen ◽  
Renyu Chen ◽  
Zhen Liu ◽  
Xuehua Yu ◽  
Shuang Zheng ◽  
...  
Keyword(s):  
Pore Water ◽  
Laboratory Experiments ◽  
Reductase Activity ◽  
Nitrogen Transformation ◽  
Transformation Mechanism ◽  
Dry Period ◽  
Bioretention System ◽  
Plant Organ ◽  
Drying And Rewetting ◽  
The Impact

Abstract Abstract Nitrogen migration and transformation in the stormwater bioretention system were studied in laboratory experiments, in which the effects of drying-rewetting were particularly investigated. The occurrence and distribution of nitrogen in the plants, the soil, and the pore water were explored under different drying-rewetting cycles. The results clearly showed that bioretention system could remove nitrogen efficiently in all drying-rewetting cycles. The incoming nitrogen could be retained in the topsoil (0–10 cm) and accumulated in the planted layer. However, the overlong dry periods (12 and 22 days) cause an increase in nitrate in the pore water. In addition, nitrogen is mostly stored in the plants’ stem tissues. Up to 23.26% of the inflowing nitrogen can be immobilized in plant organ after a dry period of 22 days. In addition, the relationships between nitrogen reductase activity in the soil and soil nitrogen content were explored. The increase of soil TN content could enhance the activity of nitrate reductase. Meanwhile, the activity of hydroxylamine reductase (HyR) could be enhanced with the increase of soil NO3− content. These results provide a reference for the future development of nitrogen transformation mechanism and the construction of stormwater bioretention systems.

Surface-modified biochar in a bioretention system for Escherichia coli removal from stormwater

Chemosphere ◽  
2017 ◽  
Vol 169 ◽  
pp. 89-98 ◽  
Author(s):  
Abbe Y.T. Lau ◽  
Daniel C.W. Tsang ◽  
Nigel J.D. Graham ◽  
Yong Sik Ok ◽  
Xin Yang ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Bioretention System ◽  
Modified Biochar ◽  
Surface Modified

Bacteria Removal and Viability Attenuation by Means of an Electrostatic Barrier

2004 ◽  
Vol 13 (4) ◽  
pp. 309-314 ◽  
Author(s):  
Mariangiola Dottori ◽  
Gabriele Fava ◽  
Maria Letizia Ruello
Keyword(s):  
Bacteria Removal
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