Вісники та науково-технічні збірники, журнали

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    Ways to improve the efficiency of wastewater treatment of a cardboard and paper mill
    (Видавництво Львівської політехніки, 2023-02-28) Sablii, Larysa; Zhukova, Veronika; Drewnowski, Jakub; National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”; Gdansk University of Technology
    The results of research on physical and chemical methods for the preliminary treatment of wastewater of a cardboard and paper factory in Khmelnytskyi region of Ukraine are presented. At the cardboard and paper factory, wastewater is treated at a sewage treatment plant, which includes sand traps, primary radial sedimentation tanks, aeration tanks with activated sludge regenerators, secondary radial sedimentation tanks, and bioponds. The use of coagulation and chlorination methods before biological treatment in aeration tanks was proposed. Alumoflock 18% was used as a coagulant, polyacrylamide was used as a flocculant, and sodium hydroxide was used as an alkalizing reagent. The study was conducted on a mixture of industrial and domestic wastewater with COD and BOD5 – 3200 and 1575 mg/dm3, respectively, and on industrial wastewater with COD and BOD5 – 4480 and 1960 mg/dm3, respectively. The effects of reducing COD and BOD5 indicators in the first case after coagulation were 30 and 40%, after chlorination - 37.81 and 43.17%, respectively, in the second after coagulation - 28.57 and 47.24%, respectively. It was established that a significant proportion of organic substances according to the COD indicator is in a dissolved state - 60-70%. It has been proven that as a result of chlorination, the maximum reduction of "pure" COD is achieved, therefore, the possibility and expediency of chlorination of water after the secondary settling tank with increased doses should be considered in the wastewater treatment technology of the cardboard and paper factory.
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    Problems of wastewater pretreatment from the edible oils production
    (Publishing House of Lviv Polytechnic National University, 2010) Przywara, Lucyna
    The pretreatment of the wastewater from the edible production based on calcium phosphates precipitation, generates sludge characterized by good sedimenting properties. However, a part of the sludge floats through the surface of the settling tank. Lime added for phosphorus removal simultaneously removes also sulphates to a level of above 2000 mg/l. The liquid associated with floated sludge contains low sulfates concentration – about 370 mg/l. The aim of the research project was to examine the causes of such a low sulphates concentration. Показано, що при попередньому обробленні стічних вод харчових виробництв внаслідок осадження фосфатів кальцію утворюється значна кількість осаду, частина якого флотує на поверхню відстійного баку. Встановлено, що вапно, яке додається для усунення фосфору, одночасно усуває сульфати до рівня 2000 мг/л, а рідина, що взаємодіє з флотованим осадом, має низьку концентрацію сульфатів – біля 370 мг/л. Встановлені причини низької концентрації сульфатів.