Kindly check following to see whether those are useful...
Duarte, K. R., Freitas, A. C., Pereira, R., Pinheiro, J. C., Gonçalves, F., Azaari, H., ... & Rocha-Santos, T. A. (2012). Treatment of olive oil mill wastewater by silica–Alginate–Fungi biocomposites. Water, Air, & Soil Pollution, 223(7), 4307-4318.
Duarte, K. R., Justino, C., Panteleitchouk, T., Zrineh, A., Freitas, A. C., Duarte, A. C., & Rocha-Santos, T. A. P. (2014). Removal of phenolic compounds in olive mill wastewater by silica–alginate–fungi biocomposites. International Journal of Environmental Science and Technology, 11(3), 589-596.
Kindly check following to see whether those are useful...
Duarte, K. R., Freitas, A. C., Pereira, R., Pinheiro, J. C., Gonçalves, F., Azaari, H., ... & Rocha-Santos, T. A. (2012). Treatment of olive oil mill wastewater by silica–Alginate–Fungi biocomposites. Water, Air, & Soil Pollution, 223(7), 4307-4318.
Duarte, K. R., Justino, C., Panteleitchouk, T., Zrineh, A., Freitas, A. C., Duarte, A. C., & Rocha-Santos, T. A. P. (2014). Removal of phenolic compounds in olive mill wastewater by silica–alginate–fungi biocomposites. International Journal of Environmental Science and Technology, 11(3), 589-596.
Ravulapalli, S., & Kunta, R. (2018). Removal of lead (II) from wastewater using active carbon of Caryota urens seeds and its embedded calcium alginate beads as adsorbents. Journal of environmental chemical engineering, 6(4), 4298-4309.
Cruz, I., Bashan, Y., Hernàndez-Carmona, G., & De-Bashan, L. E. (2013). Biological deterioration of alginate beads containing immobilized microalgae and bacteria during tertiary wastewater treatment. Applied microbiology and biotechnology, 97(22), 9847-9858.
Liu, J., Pan, D., Wu, X., Chen, H., Cao, H., Li, Q. X., & Hua, R. (2018). Enhanced degradation of prometryn and other s-triazine herbicides in pure cultures and wastewater by polyvinyl alcohol-sodium alginate immobilized Leucobacter sp. JW-1. Science of the Total Environment, 615, 78-86.
Fourier Transform Infrared (FTIR) spectroscopic techniques followed by mass spectrometry, Nuclear Magnetic Resonance (NMR), etc. to get the profile of the compounds present in the waste water.
The water should mostly contain several kinds of sugar so chromatography will help with the analysis. Also, it would be very useful to know what kind of solvents were used in the extraction (phenol, ethanol, etc.). NMR might help in identifying these solvents if the concentrations are high enough. I saw sulfate was also presented from the studies. In addition, knowing the kind of brown algae used in the extraction would be a surplus.
Article Studies on by-products from the industrial extraction of alginate
Article Extraction of Alginate from Sargassum muticum: Process Optim...
Article 1H-NMR Determination of Organic Compounds in Municipal Waste...