INVESTIGATION OF THE PROCESSES OF ADDITIONAL TREATMENT
OF WASTEWATER FROM HEAVY METAL IONS
Aziza Maksudova
Assistant teacher,
Tashkent Chemical-Technological Institute,
Uzbekistan, Tashkent
E-mail: aziza.maksudova2015@gmail.com
Klara Adilova
Candidate of Chemical Sciences, assistant professor,
Tashkent Chemical-Technological Institute, Uzbekistan, Tashkent
E-mail: klara.adilova57@gmail.com
ИССЛЕДОВАНИЕ ПРОЦЕССОВ ДОПОЛНИТЕЛЬНОЙ ОЧИСТКИ СТОЧНЫХ ВОД
ОТ ТЯЖЕЛЫХ ИОНОВ МЕТАЛЛОВ
Максудова Азиза Абдукахаровна
ассистент преподавателя
Ташкентского химико-технологического института,
Республика Узбекистан, Ташкент
Адилова Клара Муратджановна
канд. хим. наук, доцент,
Ташкентский химико-технологический институт,
Республика Узбекистан, г. Ташкент
ABSTRACT
Among the main pollutants that have a negative impact on the state of natural water bodies are heavy metal ions
coming with wastewater from oil refining, metallurgical, galvanic, tanning and other enterprises. According to the clas-
sification of the World Health Organization, heavy metals are the most dangerous substances for living organisms with
toxic, mutagenic and carcinogenic properties. At present, reagent methods are most often used to remove heavy metal
ions from wastewater, in which metal ions are converted into an insoluble form with subsequent sedimentation of sludge.
At the same time, these methods are uneconomical and have a number of disadvantages, such as incomplete removal of
metals, high consumption of reagents and energy, as well as the formation of toxic sludge or other waste that requires
disposal or processing. The purpose of this work was to study the process of purification of wastewater generated in the
production of mineral fertilizers at "Maxam-Chirchik" enterprise with effective adsorbents based on local raw materials.
Recent studies show that one of the effective adsorption materials that can be used instead of expensive synthetic adsor-
bents are bioadsorbents obtained from agricultural waste. In this work, studies were carried out on the use of bioadsorbents
obtained on the basis of rice husks by modifying it with a 5% solution of alkali NaOH and caustic soda Na
2
CO
3
for
additional purification of wastewater from the production of mineral fertilizers from heavy metal ions. The obtained
adsorbents were used for additional purification of wastewater from copper and nickel ions formed during the production
of mineral fertilizers at the “Maxam-Chirchik” enterprise. Studies have shown that adsorbents obtained by modifying rice
husks with alkali and soda have a high adsorption capacity in relation to heavy metal ions and can be used for additional
treatment of industrial wastewater.
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