Construction chemicals production wastewaters treatment. Part 2. Sludge from two-stage pretreatment

• Autorzy: Rauckyte-Żak T. , Żak S.

Identyfikatory

DOI

10.2429/proc.2018.12(1)005

Warianty tytułu

PL

Oczyszczanie ścieków z produkcji chemii budowlanej. Część 2. Osady z dwustopniowego podczyszczania

• Konferencja: ECOpole’17 Conference (4-7.10.2017 ; Polanica Zdrój, Poland)
• Języki publikacji: EN

Abstrakty

EN

The need for two-stage physicochemical pretreatment resulted out of necessity changes of the BOD₅/COD, COD(BOD₅)/TN, COD(BOD₅)/TP and TN/TP ratios on beneficial in streams directed at final treatment with biological methods. Hense also in pretreatment at the second stage was carried out with the use of oxidation or deep oxidation methods, which was reflected in the composition of sludge being subject to assessment in this part of research. Wastewaters came mainly from the line of different-tonnage producing fugal mass and sealing coatings, gypsum surfacers and putties, self-levelling compounds and grouts, paints for façades of concrete structures and interiors, cements and glazes, protective and decorative plasters. The first stage pretreatment on installations was being led applying coagulation methods based on the application of iron sulphate coagulants of PIX^® category or the aluminium ones of ALS^® category. At the second one - oxidation with the use of KMnO₄ or Fenton’s system were applied. Sludge for the assessment were being allocated as a result of dewatering them on pressurized sets of chamber presses. For generated in this way sludge the TCLP (Toxicological Characteristic Leaching Procedure) procedure and the risk assessment with the use of risk assessment code (RAC) was made. It was found that dewatered by pressure mixed sludge present low risk (LR) in case of Cd, Cr, Cu, Ni, Pb and Zn and the moderate risk (MR) concerning Mn, in case of application of potassium permanganate at the second stage of pretreatment. In case of application of Fenton’s system at the second stage of pretreatment, the mixed sludge presented low risk (LR) concerning all analysed heavy metals. In accordance with TCLP criteria, mixed sludge from two-stage physicochemical pretreatment of process wastewaters from manufacturing of the selected products of construction chemicals were classed as non-toxic wastes.

PL

Potrzeba fizykochemicznego podczyszczania dwustopniowego wynikała z konieczności zmiany relacji BZT₅/ChZT, ChZT(BZT₅)/N, ChZT(BZT₅)/P i N/P na korzystne w strumieniach kierowanych do końcowego oczyszczania metodami biologicznymi. Stąd też w podczyszczaniu na drugim stopniu zastosowano metody utleniania lub głębokiego utleniania, co znalazło swoje odzwierciedlenie w składzie osadów poprocesowych poddanych ocenie w niniejszej części pracy. Ścieki pochodziły głównie z linii różnotonażowego wytwarzania mas fugowych i powłok uszczelniających, gładzi gipsowych i szpachlowych, zapraw samopoziomujących, wodorozcieńczalnych farb i tynków silikonowych do elewacji konstrukcji betonowych i wnętrz, zapraw klejących i glazur, tynków ochronnych oraz ozdobnych. Na instalacjach podczyszczanie pierwszego stopnia prowadzono, stosując metody koagulacyjne oparte na wykorzystaniu siarczanowych koagulantów żelazowych klasy PIX^® lub glinowych klasy ALS^®, na drugim natomiast utlenianie za pomocą KMnO₄ lub układem Fentona. Osady do oceny wydzielano w wyniku ich odwadniania na zespołach ciśnieniowych pras komorowych. Dla tak generowanych osadów przeprowadzono procedurę TCLP oraz wykonano ocenę ryzyka, stosując kod RAC. Przyjęto, że ciśnieniowo odwodnione osady mieszane wykazują niskie ryzyko (LR) względem Cd, Cr, Cu, Ni, Pb i Zn oraz umiarkowane (MR) wzgledem Mn w przypadku stosowania nadmanganianu potasu na drugim stopniu podczyszczania. W przypadku stosowania układu Fentona na drugim stopniu mieszane osady charakteryzowały się niskim ryzykiem (LR) względem wszystkich analizowanych metali ciężkich. Zgodnie z kryteriami TCLP mieszane osady z dwustopniowego fizykochemicznego podczyszczania ścieków technologicznych z produkcji wytypowanego asortymentu chemii budowlanej sklasyfikowano jako odpady nietoksyczne.

Słowa kluczowe

EN

construction chemicals manufacturing; process wastewaters; two-stage pretreatment; physicochemical pretreatment; sludge; TCLP procedure; risk assessment code; RAC

PL

produkcja chemii budowlanej; ścieki technologiczne; podczyszczanie dwustopniowe; podczyszczanie fizykochemiczne; osady; test TCLP; kod oceny ryzyka; RAC

• Wydawca: Towarzystwo Chemii i Inżynierii Ekologicznej
• Czasopismo: Proceedings of ECOpole
• Rocznik: 2018
• Tom: Vol. 12, No. 1
• Strony: 51--62
• Opis fizyczny: Bibliogr. 45 poz., tab.

Twórcy

autor

Rauckyte-Żak T.

• Faculty of Chemical Technology and Engineering, University of Science and Technology, ul. Seminaryjna 3, 85-326 Bydgoszcz, Poland

autor

Żak S.

• Faculty of Chemical Technology and Engineering, University of Science and Technology, ul. Seminaryjna 3, 85-326 Bydgoszcz, Poland

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).