Wastewaters treatment from rail freight car wash. Assessment of physicochemical treated sludges

Rauckyte-Żak, T.; Żak, S.

doi:10.2429/proc.2017.11(1)009

Artykuł - szczegóły

Tytuł artykułu

Wastewaters treatment from rail freight car wash. Assessment of physicochemical treated sludges

Autorzy

Rauckyte-Żak T. , Żak S.

Treść / Zawartość

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Identyfikatory

DOI

10.2429/proc.2017.11(1)009

Warianty tytułu

Oczyszczanie ścieków z myjni wagonów towarowych. Ocena osadów po fizykochemicznym oczyszczaniu

Konferencja

ECOpole’16 Conference (5-8.10.2016 ; Zakopane, Poland)

Języki publikacji

Abstrakty

The process of physico-chemical pretreatment of wastewaters produced in the rail freight car wash was carried out under flow conditions in two-chamber reactor of accelator type with a final fine purification on multi-layer gravel filter. The post-processing sludge were generated as a result of the use of coagulation and flocculation and, to a minimum degree, from washings formed due to a periodic backwash of gravel filters. This article presents the results concerning assessment of gravitationally dewatered post-coagulation sludge and sludge from backwashing of gravel filters, released after sedimentation, and dewatered mixture of these two types of sludge. These all precipitates were subject to leaching with the use of TCLP procedure and risk assessment based on the analysis of fractional composition of selected heavy metals. It was found that sludge from wastewater treatment after the use of the two-stage acid-alkaline (PIX® 116 - SAX® 18) or alkaline-acid coagulation (SAX® 18 - PAX® 18) with a final flocculation and phase separation in a flow type accelator are characterised by a distinctly lower leachability levels of heavy metals than in case of post-sedimentary primary sludge and they manifest low risk considering Cu, Ni, Pb and Zn determined by the adopted level of risk assessment code (RAC). According to the criteria adopted for TCLP classification, the analysed sludge are neither toxic nor hazardous waste.

Proces fizykochemicznego podczyszczania ścieków wytwarzanych na myjni kolejowych wagonów towarowych był prowadzony w warunkach przepływowych na dwukomorowym reaktorze typu akcelator z końcowym doczyszczaniem na wielowarstwowym filtrze żwirowym. Osady poprocesowe były generowane w wyniku zastosowania koagulacji i flokulacji oraz w minimalnym stopniu z wód popłucznych w wyniku stosowania okresowego, wstecznego płukania filtrów żwirowych. Przedstawiono wyniki oceny odwodnionych grawitacyjnie osadów pokoagulacyjnych i osadów z wstecznego płukania filtów żwirowych wydzielanych na drodze sedymentacji oraz odwodnionej mieszaniny tych dwóch rodzajów osadów. Przedmiotowe osady poddano ługowaniu za pomocą procedury TCLP oraz ocenie ryzyka na podstawie analizy składu frakcyjnego wytypowanych metali ciężkich. Stwierdzono, że osady pochodące z procesu oczyszczania po zastosowaniu dwustopniowej koagulacji kwaśno-alkalicznej (PIX® 116 - SAX® 18) lub alkaliczno-kwaśnej (SAX® 18 - PAX® 18) z końcową flokulacją i separacją faz na układzie przepływowym typu akcelator charakteryzują się zdecydowanie niższymi poziomami wymywalności metali ciężkich niż wstępne osady posedymentacyjne oraz wykazują niskie ryzyko względem Cu, Ni, Pb i Zn określone przyjętym poziomem kodu oceny ryzyka (RAC). Według kryteriów przyjętych dla klasyfikacji TCLP, analizowane osady nie są odpadami toksycznymi i niebezpiecznymi.

Słowa kluczowe

treatment of wastewaters from railway freight car wash sludge after coagulation sludge from gravel filter backwashing TCLP test fractional composition of metals in sludge risk assessment code RAC

oczyszczanie ścieków z myjni wagonów towarowych osady pokoagulacyjne osady z wstecznego płukania filtrów żwirowych test TCLP skład frakcyjny metali zawartych w osadach kod oceny ryzyka RAC

Wydawca

Towarzystwo Chemii i Inżynierii Ekologicznej

Czasopismo

Proceedings of ECOpole

Rocznik

2017

Tom

Vol. 11, No. 1

Strony

87--96

Opis fizyczny

Bibliogr. 38 poz., tab.

Twórcy

autor

Rauckyte-Żak T.

terra@utp.edu.pl

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

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

Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-1ae2e696-4be5-4fe3-bff6-02d0cb74c402