Determination of the flotation effectiveness of industrial waste water in a laboratory

Abstract

This article presents the test results of the laboratory flotation equipment LFM–001 for the treatment of simulated wastewater with a high content of oil products and surfactants. To obtain a water–air mixture, tap water with a volume of up to 40 dm3 was used, through which air was passed, with a volume till 5% of the water volume. The size of the resulting bubbles was determined by the pressure established in the aeration tank before the tests and by the flow rate of the air-water mixture in the flotation machine. After a series of tests, in series where a water–air mixture was added to laboratory containers with simulated wastewater, oil particles formed flakes in the presence of a coagulant. These flakes, together with air bubbles of the air–water mixture, floated to the surface of the container and formed a foamed, oily layer 5 mm thick. At the same time, the water in the laboratory vessel, after passing the air–water mixture became more transparent visually than water in other laboratory vessels.

Improving the efficiency of biological treatment of industrial wastewater as part of urban wastewater

“…При имитации залповых сбросов стоков пищевой промышленности добавление 5 мл спиртового раствора к 5 л сточных вод городской канализации привело к резкому росту ХПК с 230-330 мгО/дм 3 до 2150 мгО/дм 3 . Добавление в сточные воды 5 мл нефтепродуктов также сопровождалось резким ростом ХПК до 1930 мгО/дм 3 , добавление 10 мл нефтепродуктов способствовало увеличению ХПК до 1760 мгО/дм 3 .…”

“…Изменение значения ХПК в нескольких сериях опытов: 1) контрольная серия без добавления ПУ, концентрация СР 1 мл/дм 3 ; 2) концентрация ПУ 0,1 г/дм 3 , концентрация СР 1 мл/дм 3 ; 3) контрольная серия без добавления ПУ, концентрация НП 1 мл/дм 3 ; 4) концентрация ПУ 0,1 г/дм 3 , концентрация НП 1 мл/дм 3 ; 5) контрольная серия без добавления ПУ, концентрация НП 2 мл/дм 3 ; 6) концентрация ПУ 0,1 г/дм 3 , концентрация НП 2 мл/дм 3 Fig. Change of COD value in several series of experiments: 1) control series without adding powdered activated carbon (PAC), alcohol solution (AS) concentration 1 mL/dm 3 ; 2) PAC concentration 0.1 g/dm 3 , AS concentration 1 mL/dm 3 ; 3) control series without addition of PAC, oil product concentration 1 mL/dm 3 ; 4) PAС concentration 0.1 g/dm 3 , oil product concentration 1 mL/dm 3 ; 5) control series without adding PAС, oil product concentration 2 mL/dm 3 ; 6) PAС concentration 0.1 g/dm 3 , oil product concentration 2 mL/dm…”

“…промышленных предприятий (в некоторых городах количество производственных СВ достигает 50% и более от общего количества СВ) [1][2][3]. Сброс СВ от промышленных предприятий, концентрации загрязняющих веществ в которых превышают согласованный сброс в городскую канализацию, приводит к нарушению работы очистных сооружений, doi: 10.25750/1995-4301-2023-2-096-103 особенно сооружений биологической очистки СВ [4].…”

“…Примечание: СР -спиртовой раствор; НП -нефтепродукты; в осветлённых СВ значение ХПК варьировало от 230 до 330 мгО/дм3 .Note: AS -alcohol solution; OP -oil products; in clarified wastewater, the COD value varied from 230 to 330 mgO/dm 3 .…”

Nanocomposite-based high-performance adsorptive water filters: recent advances, limitations, nanotoxicity and environmental implications

“…Thus, the management of water resources becomes a prerequisite. To address the issue of potable water scarcity, there are several traditional materials and treatment technologies already employed for the management of wastewaters like adsorption, 8 coagulation, 9 precipitation, 10 ion exchange, 11 membrane-based filtration, 12 oxidation, 13 floatation 14 and many others to fit into the purpose of environmental remediation. Membrane technologies, in particular, are promising and widespread, have low-cost separation efficiency and find applications in a variety of water treatment technologies due to their robustness 15 and facilities that are well integrated.…”