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Efficiency of wastewater purification in medium sand with a lightweight expanded clay aggregate assisting layer

Kalenik Marek, Wichowski Piotr, Chalecki Marek, Kiczko Adam

Journal of Water and Land Development

2023

no. 57

30--38

The objective of this experimental study was to examine whether an assisting layer of lightweight expanded clay aggregate (LECA) of the granulation 1-4 mm, introduced into a subsoil, is able to improve an efficiency of removal of total nitrogen and total phosphorus from domestic wastewater. In the investigations, an assisting 0.10 and 0.20 m thick LECA layer was applied. It has been observed that the effectiveness of removal of total suspended solids (TSS), total nitrogen and total phosphorus from wastewater as well as the level of biochemical oxygen demand (BOD5) and chemical oxygen demand (COD) is in accordance with the Polish standards on wastewater disposal into grounds and surface water. The performed experiments showed that the effectiveness of raw wastewater purification for the medium sand soil bed with the 0.20 m thick assisting LECA layer is higher than for the 0.10 m thick assisting layer. In the medium sand soil bed with the 0.20 m thick assisting LECA layer, the removal efficiency regarding total nitrogen increased by 20.6%, total phosphorus by 5.2%, ammonium nitrogen by 8.8% and TSS by 5.3%, and reduction efficiency regarding BOD5 increased by 1.7% and COD by 2.3% with relation to the 0.10 m thick assisting LECA layer (all percentages - in average). The results of the experiment showed that the LECA with the granulation 1-4 mm can be used to assist in removal of total nitrogen and total phosphorus from wastewater with application of infiltration drainage.

Zastosowanie indywidualnych oczyszczalni ścieków w niekorzystnych warunkach gruntowo-wodnych

Karolinczak B.

Inżynieria Ekologiczna

2014

Nr 40

129--136

W artykule przedstawiono technologiczne i ekonomiczne aspekty zastosowania indywidualnych oczyszczalni ścieków w niekorzystnych warunkach gruntowo-wodnych, rozumianych jako występowanie gruntów nieprzepuszczalnych, a także wysokiego poziomu wód gruntowych. W ramach analizy technicznej usystematyzowano informacje w zakresie możliwych do zastosowania technologii oczyszczania i odprowadzania ścieków oczyszczonych. W ramach analizy ekonomicznej wykazano z jakimi dodatkowymi nakładami inwestycyjnymi wiąże się budowa indywidualnej oczyszczalni ścieków w niekorzystnych warunkach gruntowo-wodnych. W podsumowaniu dokonano analizy efektywności kosztowej możliwych do zastosowania technologii.

The article presents technological and economic aspects of application of individual wastewater treatment plans in difficult soil and water conditions which include impermeable soils and a high level of groundwater. Technical analysis reviews available information around possible technologies applicable to sewage treatment and its discharge. Economic analysis highlights additional outlays that are associated with a construction of the treatment plant in such difficult conditions. In summary, a cost-effectiveness analysis is carried out.