Physico-chemical Wastewater Treatment from Complex Organic Substances Using Flotocombs

Abstract

The issues of extraction of complex organic substances from wastewater using physico-chemical methods of coagulation, flotation, adsorption. At the same time, flotation combines of the KBS type are used at the flotation stage, which make it possible to effectively treat wastewater from suspended pollutants and complex organic substances. At the stage of sorption treatment, a deep extraction of complex organic substances occurs up to trace amounts, which allows to achieve the normative quality of water treatment with the possibility of discharge into an open reservoir.

Ion flotation and its applications on concentration, recovery, and removal of metal ions from solutions

“…HCl, HNO3), organics (e.g. EDTA), and inorganic substances (Ksenofontov et al, 2019). Heavy metals ions can be removed by biological treatments.…”

“…Metal ions can enter water bodies and soil, accumulate in animals and plants through the food chain, and eventually accumulate in the human body, seriously endangering human health and life due to their non-degradability, mobility and persistence, therefore they need to be removed from wastewaters before discharging (Doyle, 2003). Heavy metal wastewater treatment techniques are chemical precipitation (hydroxide precipitation, sulfide precipitation, chemical precipitation combined with other methods, heavy metal chelating precipitation), ion exchange, adsorption (activated carbon adsorbents, carbon nanotubes adsorbents, low-cost adsorbents, bioadsorbents), membrane filtration (ultrafiltration, reverse osmosis, nanofiltration, electrodialysis), flotation (dissolved air flotation, precipitate flotation, ion flotation), coagulation-flocculation, evaporation, and electrochemical treatment (electrocoagulation, electroflotation, electrodeposition) (Fu and Wang, 2011) and the methods for sludge dewatering is alkaline and acid hydrolysis for neutralization and biological treatment (Ksenofontov et al, 2019). However, these removal methods have many disadvantages such as high cost, generation of large amounts of sludge, high reagent or energy requirements, time consumption, incomplete removal of target ions, production of secondary wastes and difficulty of treatment of large volumes of wastewater (Doyle, 2003).…”