Removal of inorganic impurities from wastewater after production of soda ash on selected sorbents

Abstract

the soda ash industry is a part of the chemical industry, which is responsible for the production of sodium carbonate, calcium chloride, absorbent masses, evaporated wet salt, food salt, pickling salt or salt tablets. During manufacturing of those products, strongly alkaline wastewater is generated. it could be characterised by a high electrolytic conductivity and concentration of ions: chlorides, sulfates, phosphates, calcium, sodium, magnesium, potassium and ammonium. the aim of the research was to test the effectiveness of removing sodium, potassium, calcium, magnesium and ammonium from wastewater after production of soda ash by three sorbents: Halosorb, compakt and Damsorb K. The process was carried out using dynamic method with different flow of wastewater through the column with sorbent. it allowed to reduce concentrations of all cations tested. Moreover, it was found that sorbent type did not significantly affect the removal of any of the ions, but the deposit load had significant impact on the removal of all ions tested.

Applications of Biocatalysts for Sustainable Oxidation of Phenolic Pollutants: A Review

“…Similar to what has been reported for biological wastewater treatments, this issue can be rectified by separating the dissolved and suspended inorganic materials using some simple conventional techniques such as precipitation, ion exchange, coagulation-flocculation, filtration, etc. [172][173][174]. However, it is still more favorable to develop robust enzymatic systems which are tolerant to the presence of some inhibitory compounds, in order to reduce the environmental impact, as well as the cost of the physical treatment processes.…”

CaCO3 Precipitation Kinetics in the System CaCl2–CO2–Mg(OH)2–H2O for Comprehensive Utilization of Soda Production Wastes

“…The soda ash is produced by thermal decomposition of the sodium bicarbonate (calcination). Finally, ammonia recycle is implemented by using milk of lime to treat the mother liquor bearing ammonia chloride (ammonia regeneration). − The ammonia column distillers in ammonia regeneration discharge large amounts of liquid waste, mainly consisting of 9 wt % CaCl 2 and 4 wt % NaCl. The calcium chloride in the liquor originates from the reaction of ammonium chloride with calcium hydroxide while the sodium chloride results from an incomplete reaction.…”