Wastewater Treatment by Infiltration Basins. Case Study: Saint Symphorien de Lay, France

1993 ◽  
Vol 27 (9) ◽  
pp. 97-104 ◽  
Author(s):  
J. A. Guilloteau ◽  
A. Lienard ◽  
A. Vachon ◽  
J. Lesavre
Keyword(s):  
Wastewater Treatment ◽  
Phosphorus Removal ◽  
Domestic Wastewater ◽  
Biologically Active ◽  
Infiltration Basin ◽  
Domestic Wastewater Treatment ◽  
Nitrogen Yields ◽  
High Production ◽  
Flooding Period

Domestic wastewater treatment by infiltration basins is a process that is becoming common in France. In the absence of accurate operating data, we felt it would be useful to conduct a case study at an existing plant. The Saint Symphorien de Lay plant, serving a population-equivalent of 500, was chosen because the basins are watertight and drained. The study revealed 85% TSS, COD and Total Phosphorus removal. Nitrogen yields varied over the flooding period, with a high production of nitrates at the beginning of the period. The rate of decontamination (1 to 2 Log unit) was lower than expected. The infiltration surface should increase from 1 to 1.5 m2/p.e. and spread over three basins. Research is now focusing on finding the biologically active depth of an infiltration basin.

Wastewater Treatment over Sand Columns – Treatment Yields, Localisation of the Biomass and Gas Renewal

1993 ◽  
Vol 28 (10) ◽  
pp. 109-116 ◽  
Author(s):  
J. A. Guilloteau ◽  
J. Lesavre ◽  
A. Liénard ◽  
P. Genty
Keyword(s):  
Wastewater Treatment ◽  
Natural Ventilation ◽  
Domestic Wastewater ◽  
Biologically Active ◽  
Effluent Quality ◽  
Domestic Wastewater Treatment ◽  
Gaseous Composition ◽  
Active Substrate ◽  
The Media ◽  
Flooding Period

Domestic wastewater treatment by infiltration-percolation is a process that is becoming common in France. The aim of this study is to find the depth of biologically active substrate in an infiltration basin by determining the depth of the media colonised by the biomass and by studying oxygen renewal mechanisms. The study using sand columns has allowed simultaneous comparison, on the same profile, of biomass content (ATP), gaseous composition (chromatography) and the variations of the effluent quality (carbon, nitrogen, phosphorus). Down to a depth of 30 cm, removal rates achieved in terms of conventional treatment parameters are very high (COD and SS > 90%, NH4+ ≈ 95%, total phosphorus ≈ 50%). Beyond a depth of 15 cm, the biomass content (expressed in ATP) is ten times less than at the surface, and virtually ceases to develop. Monitoring of O2 levels points to the need for drying periods in order to ensure natural ventilation of the basins. The primary settling stage must be effective in order to avoid any risk of clogging which would prevent the air from being renewed by diffusion.The length of the drying period must be almost double that of the flooding period to allow the media to recover as much of its treatment capacity as possible. This study pinpointed the depth of the biologically active substrate at arround 30 cm. The data obtained from this trial project point to the following design criteria: 1.5 m2/p.e. spread over three basins, and a drying period twice as long as the flooding period. The sand depth will depend on the plant's overall water quality objectives: around 0.50 m for the removal of carbonaceous pollution and nitrification of Kjeldahl nitrogen, a greater depth for disinfection purposes.

Performance of constructed wetland applied for domestic wastewater treatment: Case study at Boimorto (Galicia, Spain)

2016 ◽  
Vol 95 ◽  
pp. 324-329 ◽  
Author(s):  
Juan Alfredo Jácome ◽  
Judith Molina ◽  
Joaquín Suárez ◽  
Gonzalo Mosqueira ◽  
Daniel Torres
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetland ◽  
Domestic Wastewater ◽  
Domestic Wastewater Treatment

scholarly journals SEWAGE PHOSPHORUS REMOVAL USING HEN EGGSHELLS THROUGH DIFFERENT CONTACT SYSTEMS

2020 ◽  
Vol 28 ◽  
Author(s):  
Juliano Curi de Siqueira ◽  
Mateus Pimentel de Matos ◽  
Ivan Célio Andrade Ribeiro ◽  
Ronaldo Fia ◽  
Antonio Teixeira de Matos
Keyword(s):  
Wastewater Treatment ◽  
Phosphorus Removal ◽  
Hydraulic Retention Time ◽  
Domestic Wastewater ◽  
Removal Capacity ◽  
P Concentration ◽  
Domestic Wastewater Treatment ◽  
Real Wastewater ◽  
Maximum Removal ◽  
P Removal

Hen eggshell is a waste with high phosphorus (P) removal capacity from synthetic solutions. However, there is a lack of knowledge about how to use this material on P removal from real wastewater. The present study proposed to evaluate two types of system for P removal from wastewater using eggshells. On the first system, eggshells grinded, sieved in 0.425 mm, and contained in coffee filters, were fixed to baffles using calico cloth bags. On the second, the eggshells in the same conditions were attached to vertical wooden rods and distributed at different heights. For both systems, P concentration was daily monitored for four weeks, with and without medium acidification and hydraulic retention time of one day. The baffles system was more efficient, reaching a maximum removal of 15.93% in wastewater with pH 4.73. P removals did not differ significantly over the weeks; however, there is a tendency to vary the efficiencies according to the change in pH. The baffled tank, for presenting higher performance in P removal, is the most suitable for use in a domestic wastewater treatment system.

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