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Nitrogen compounds in effluents from a septic tank

Pawlak Maciej, Makowska Małgorzata, Spychała Marcin, Chmielowski Krzysztof

Environment Protection Engineering

2024

Vol. 50, nr 1

161--174

The paper presents the results of long-term studies on the concentrations of total nitrogen and ammonium nitrogen in a septic tank effluent. A statistical analysis concerning the sampling day and the season was performed. The mean concentration of total nitrogen in the effluent was 47±9 g N/m3 and the mean concentration of ammonium nitrogen was 33±11 g N/m3. Results on the cumulative distributions of total nitrogen and ammonium nitrogen in the outflow from the septic tank have also been presented.

Three-dimensional laminar dispersion of a solute in a couple-stress fluid flow through a rectangular channel

Manjunath S., Siddheshwar P. G.

International Journal of Applied Mechanics and Engineering

2011

Vol. 16, no 3

775-789

Three-dimensional dispersion of a passive solute in a couple stress fluid through a channel of rectangular cross section is studied using the generalized miscible dispersion theory of Gill and Sankarasubramanian (1970) and Doshi et al. (1978). The effects of couple stress on the velocity and thereby the convective and dispersion coefficients are discussed. The time-dependent dispersion coefficient and mean concentration distribution are computed and the results are represented graphically for various values of the aspect ratio and couple-stress.