Complex Purification of Industrial Phenolic Wastewater by Using Adsorbents from Natural Raw Materials

Abstract

There has been presented the data on the mineral composition of natural clays in order to select the optimum adsorbent in the technology of extracting from the liquid waste of the coke-chemical enterprise PRAT "DKHZ" in the city of Kamyanske phenols, rhodanides and ammonia. The advantages of the use of natural adsorbent glauconite in combination with cation flocculant CW 3279 in the complex purification of coke-chemical waste from phenols, rhodanides and ammonia are grounded, which are then fed to an active sludge with phenol- and rhodandestructive microorganisms. The process of activation of natural minerals — glauconite and zeolite with hydrochloric acid 7% HCl in the ratio of "mineral sorbent: acid solution" is used as 1: 6. The process of adsorption removal of phenols, rhodanides and ammonia from industrial wastewater in a laboratory installation with a stirrer with the use of glauconite, zeolite, bentonite, sunflower husk in the native form is explored; acid-activated zeolite and glauconite at doses of 2 g/dm³; bentonite and glauconite in combination with cation flocculant CW 3279 in volume of 5 ml/dm³ in the time interval 60—120 min. It has been experimentally determined that the most effective removal of phenols in industrial effluents from 410,74 mg/dm³ to 207,68 mg/dm³ occurs when using glauconite with cation flocculant CW 3279. It was investigated that when applying acid-activated zeolite with a dose of 2 g/dm³ and time contacting 120 min, reduction of the concentration of total ammonia from 1192,10 mg/dm³ to 340,60 mg/dm³, glauconite with cation flocculant CW 3279 — up to 510,90 mg/dm³ is provided. Degree of purification from rhodanide-ions by acid-activated zeolite has been reached in 1,5 times, whereas in the application of glauconite with cationic flocculant CW 3279 in 1,2 times. The regularities of adsorption extraction of phenols from model solutions have been established, which makes it possible to reduce their content from 1151,57 mg/dm³ to 355,36 mg/dm³ by glauconite in combination with cationic flocculant CW 3279 in the interval of 40—120 min. It is recommended to use glauconite at a dose of 2 g/dm³ in combination with cation flocculant CW 3279 — 5 ml/dm³ for 120 min drainage treatment. The sediment that is accumulated in the process of cleaning liquid waste is proposed to be processed and used as a binder in the paverment production.