The Use of Sorbents in Removal of Selected Cations from Wastewater After Soda Ash Production

Abstract

Wastewater generated in the soda ash production process can be characterized by a strong alkaline reaction, high electrolytic conductivity and high concentration of chlorides, ammonia, sulphates, phosphates, calcium, potassium, sodium and magnesium. Protection of water against pollution should be not only connected with rational management of water resources and the restoration of the water environment to the required state, but also with prevention of pollution. It is an increasingly important element of protective measures. The strict control of pollution at the source is important. Therefore, it is necessary to develop methods of broadly defined waste disposal from industry. The article presents the results of research aimed at the removal of sodium, calcium, potassium, magnesium and ammonium ions from wastewater from soda ash production using three sorbents: Halosorb, Compakt and Damsorb K. The ion removal process was carried out dynamically with different load on the deposit. The concentration of all these anions was reduced to some extent, which indicates the possibility of further, more accurate tests. It was found that the type of sorbent does not differentiate the results of the experiment. The load on the deposit, on the other hand, has an impact on the efficiency of sorbents in wastewater treatment.

Prospects for the use of liquid waste from the production of sodium carbonate as a coolant based on the ternary system CaCl2-K2Cr2O7-H2O

“…Пробу объемом 10 см 3 помещали в коническую колбу, доводили объем до 100 см 3 дистиллированной водой. До начала титрования создавали кислую среду (pH 2,5) азотной кислотой, фиксируя ее значение, введением кислотно-основного индикатора бромфенолового синего, затем добавляли индикатор дифенилкарбазид и титровали раствором нитрата ртути (II) с молярной концентрацией эквивалента 0,02 моль/дм 3 до изменения цвета от лимонножелтого до сине-сиреневого [10].…”

Influence of Raw Materials and Technological Factors on the Sorption Properties of Blast-Fuel Coke

“…Consequently, carbon sorbents are used to purify water from dyes, phenols, various metal ions, and to purify gases. The efficiency of the adsorption process depends on the physicochemical properties of the sorbent (bulk density, specific surface area, pore volume, and mechanical strength) [1][2][3][4].…”

“…For the coke fraction with a size of 2-5 mm, the authors [3] indicate that steam activation at a temperature of up to 850 • C with a process duration of 120 min is optimal. At the same time, the average value of the specific surface increases eight times compared to the raw material.…”

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

“…Plants involved in the production of soda ash belong to the chemical industry. Most often they use the Solvay method as their production process, which is associated with the formation of saline waste [7][8][9][10] . Limiting the negative impact on environment consists in pre-treating the post-production sewage and restricting its contact with underground water 11 .…”

“…However, most of them are expensive and ineffective in relation to all mentioned ions simultaneously. One of the promising methods in the treatment of post-production sewage has become the use of easily accessible, simple to use, low-cost and, importantly, environmentally non-toxic sorbents 7,20 .…”