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2014 | 21 | 1 | 101-112
Tytuł artykułu

Research on physico-chemical pretreatment of wastewater from the production of wood coating materials

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
This paper presents the results of the research conducted on the installation designed for physico-chemical pretreatment of technological wastewater in the volume of up to 5.0 m3/day discharged from the production of protective and decorative coating materials used for wooden surfaces. The subject-matter installation constructed on a mobile pallet, consisted of a storage-averaging tank where concentrations were equalised with the use of circulation aeration and mixing. A variant, preliminary pre-oxidation with the use of hydrogen peroxide was conducted in this tank. A substantial installation set for the wastewater treatment plant consisted of two preliminary tube reactors, one cylindrical-conical processing reactor, stations for preparing and dispensing reagents and the sediment dewatering station. Considerable reductions in main chemical indicators of water pollution were obtained in the installation: both total suspended solids (TSS) and ether extract (EE) - more than 98%, chemical oxygen demand (COD) - 46-54%, biochemical oxygen demand (BOD5) - 39-46%, and free formaldehyde (HCHO) - 14-27% due to the use of pre-oxidation and the acid - alkaine double coagulation by applying the ALCAT 105 - SAX 25 system. The use of pre-oxidation with hydrogen peroxide in doses 250.0-450.0 mg/l and then two-stage coagulation resulted in an increase in the reduction of: COD and BOD5 by ca 10-15%, and HCHO by ca 58-66% with reference to the water pretreatment without pre-oxidation. The assessment of sediments formed during the process of pretreatment was made determining the leachable forms of metals (Cu, Ni and Ti) according to methodology of TCLP in compliance with the US EPA Method 1311.
PL
Przedstawiono wyniki badań prowadzonych na instalacji zbudowanej na potrzeby fizykochemicznego podczyszczania ścieków technologicznych w ilości do 5,0 m3/dobę z produkcji materiałów powłokowych, ochronnych i dekoracyjnych, stosowanych na powierzchnie drewniane. Przedmiotowa, mobilna instalacja zbudowana na przenośnej palecie, składała się ze zbiornika magazynująco-uśredniającego, w którym wyrównywanie stężeń prowadzono za pomocą napowietrzania i mieszania cyrkulacyjnego. Wariantowo w tym zbiorniku prowadzono wstępne utlenianie za pomocą nadtlenku wodoru. Zasadniczy zespół instalacji oczyszczalni tworzyły reaktory: dwa wstępne rurowe i procesowy cylindryczno-stożkowy, stacje przygotowania i dozowania reagentów oraz stacja odwadniania osadów. Stosując preutlenianie oraz podwójną koagulację kwaśno-alkaliczną układem ALCAT 105 - SAX 25, na instalacji uzyskiwano ponad 98% redukcję zawiesin ogółem (ZO) i ekstraktu eterowego (EE), 46-54% chemicznego zapotrzebowania na tlen (ChZT), 39-46% biochemicznego zapotrzebowania na tlen (BZT5) i 14-27% wolnego formaldehydu (HCHO). Zastosowanie wstępnego preutleniania za pomocą nadtlenku wodoru w dawkach 250,0-450,0 mg/dm3, a następnie dwustopniowej koagulacji skutkowało wzrostem redukcji ChZT i BZT5 ca 10-15%, a HCHO ca 58-66%, w relacji do wariantu bez preutleniania. Oceny powstających osadów po procesie podczyszczania dokonano, oznaczając wymywalne formy metali (Cu, Ni and Ti) według metodyki TCLP zgodnie z procedurą US EPA Method 1311.
Wydawca

Rocznik
Tom
21
Numer
1
Strony
101-112
Opis fizyczny
Daty
wydano
2014-03-01
online
2014-04-09
Twórcy
  • Department of Chemical Technology and Engineering, University of Technology and Life Sciences, ul. Seminaryjna 3, 85-326 Bydgoszcz, Poland, zak@utp.edu.pl
  • Department of Chemical Technology and Engineering, University of Technology and Life Sciences, ul. Seminaryjna 3, 85-326 Bydgoszcz, Poland
  • Department of Environmental Engineering, Vilnius Gediminas Technical University, Sauletekio al. 11, LT-10223 Vilnius-40, Lithuania
  • Department of Research and Implementation, Projprzem-Eko Sp. z o.o., ul. Osiedlowa 1, 89-200 Zamość n. Bydgoszcz, Poland
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_eces-2014-0009
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