Situation in the textilesectorfor water ruese

Transcription

1 Technologies for low and medium concentrated streams in textile finishing industry for water reuse purposes Spagni A. 1, Vajnhandl S. 2, Farina R. 1, Majcen Le Marechal A. 2 1 ENEA, Bologna, Italy 2 University of Maribor, Maribor, Slovenia Aquafit4use End Congress Bruges, Belgium, 8-9 May 212 Examples of wastewaters of a textile industry Some examples of different processes H 2 O dist. Batch effluents from different phases of cotton dyeing H 2 O dist. Situation in the textilesectorfor water ruese Softening Wells Storage Uses Watewater Reusability criteria/guidelines Parameter Proposed Value ph Conductivity 1.5 ms/cm Suspended solids 1 mg/l Turbidity 1 NTU COD 6 mg/l Colour <

2 Treatability criteria: definition of low concentrated textile wastewater Parameter Proposed Value ph <1 Conductivity Suspended solids Turbidity COD <3 ms/cm* 2 mg/l 2 NTU 3 mg/l Colour <.5 *If high chloride concentration is present the value decrease to 1.6 Medium concentrated textile wastewater Medium concentrated streams have been defined as all mix wastewater after separation of the most concentrated ones coming from specific machines in the factory; These medium concentrated streams have too high organic content to be cost-efficiently treated just by proposed physical-chemical techniques (UF, ) and/or AOP; Biological treatment was added and MBR was tested with anaerobic pretreatment: MBR effluent was further treated by UV/H 2 O 2 technology or. 5 6 Schematic of the studied treatment technologies for textile wastewater treatment for reuse Wastewater Coagulation [MF] Biological Ultrafiltration AOP Nanofiltration [Concentrates] Treated Water Schematic of the Nanofiltration pilot plant Gauge Concentrate MF Gauge and Pressure control Permeate Evapoconcentration Waste Wastewater Pump and Filter 2

3 Nanofiltration pilot-plant Schematic of the pilot plant for Ultrafiltration Blower P2 Effluent BackPuls vessel P3 Screen Storage tank at the industry P1 9 Schematic of the MBR pilot Gasmeter Blower P2 Effluent BackPuls vessel P3 Anaerobic biofilter Aerobic MBR Screen Storage tank at the industry P1 3

4 Batch UV/H 2 O 2 Reactor 14 Pilot UV/H 2 O 2 Reactor Results Filtration Administrative issues 16 4

5 Effluent: DF/JIG/REA/D 1- Feed 2-3 Permeate and concentrate UF Spiral wounded 4-5 Permeate and concentrate 1- Feed 2-3 Permeate and concentrate UF Hollow fibre 4-5 Permeate and concentrate 1- Feed 2- After coagulation 3-4 Permeate and concentrate UF Hollow fibre Spectrum of the Sample treated by UF Absorbance Wavelength (nm) WW6 UF P1 UF P2 UF C Normalised (25 C) permeability (L25 C, L/m2 h bar) Permeability WW3 Conductivity at 25 C sample treated by L_25(L/(m2*h*bar) L filtered from 1 m 3 WW3 P1 WW3 P2 WW3 P3 WW3 P4 WW3 P5 Samples Conductivity 25 C (µs/cm) WW1 P1 C2 P2 C3 P3 C4 P4 C5 P5 Sample Concentrates Permeates 5

6 Spectrum treated by pilot plant Absorbance Spectrum WW wavelength (nm) P1 P2 P3 P4 P5 WW1 6

7 Spectrum of Sample N.3 (WW3) biological treated (anaerobic biofilter combined with MBR) and after treatment Results MBR.2.18 Absorbance WW3.12 MBR.1 MBR P1.8 MBR P2.6 MBR P3.4 MBR P4.2 MBR P Wavelength (nm) Administrative issues 27 7

8 Ultrafiltration Membrane before and after use Summary of the main results Low concentrated WW Parameter WW COD (mg/l) 2-6 Conductivity (ms/cm).4-.6 Abs <1. COAG+UF COD=6-7 UF COD=5-15 K=No Effect Abs<.5 COD<1 K<.2 Abs<.1 AOP TOC<5 No Effect Parameter Summary of the main results Medium concentrated WW WW COD (mg/l) 5-15 Conductivity (ms/cm) Abs.2-1. MBR COD<1 K=No effect Abs<.5 COD<3 K<1. <.1 AOP TOC<2 K=No Effect Abs<.1 K= Abs<.1 Abs<

9 Reuse test Concluding Proposedtraintechnologiesfor water treatment for reuse in the textile sector Low Conc WW Middle Conc WW UF Biological AOP REUSE Conceptfor water ruese in the textile sector Wells Storage 1 Uses A Source 1 Source 2 Storage 2 Treatment Reuse Uses B Not reusable WW 2 WW 1 Reusable Thank you for your attention 35 9