An Attempt to Optimise the Process of Nanofiltration of Pool Water Enriched with Compounds Associated with Secretions of the Human Body

This paper discusses the possibilities of purifying pool water by the process of nanofiltration. The analysis was carried out in the presence of substances analogous to the secretions of the human body. The samples of water collected from the school swimming pool was enriched with selected organic and inorganic compounds. The transport-separation properties of nanofiltration membranes were assessed. In the context of the removal of these organic compounds, the measurement of the total organic carbon concentration was of particular importance.

Relationship between Color CIEL∗a∗b∗ and Total Organic Carbon in Compost

The CIEL∗a∗b∗ coordinates and the total organic carbon content in compost were correlated. Two particle sizes of 0.5 and 2 mm were obtained in the compost samples; the surface color was analyzed with a CIEL∗a∗b∗ colorimeter and the total organic carbon content by spectrophotometry at 588.9 nm. The results indicate that all chromaticity values were significantly affected (p<0.001) by particle size. Chromaticity values a∗, b∗, C∗, and h° showed significantly strong Pearson correlations (r>0.95). The coordinates a∗ (r=−0.992) and b∗ (r=0.968) have the potential to be used in estimating the total organic carbon concentration in the compost samples analyzed.