dehalogenation and hexavalent chomium

7/24/2019 Dehalogenation and Hexavalent Chomium

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DEHALOGENATION


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WHAT IS DEHALOGENATION

REVERSE OF HALOGENATIONREMOVAL OF A HALOGEN FROM A MOLECULE (IN THIS CASE : WASTE TREATME

WHY HALOGEN COMPOUNDS NEED TO BEREMOVED?

It emits i!"# t$%i& 'mes $* e+te, It -$,&es t$%i& +*, &$--$si.e 'mes /e* -e+&t

/it /+te- $- ste+m


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HALOGENS

FLUORINECHLORINE BROMINE

IODINEASTETINE

HALOGEN GROUP?

TOPUP RM0


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THERE ARE TWO TYPES OF

DEHALOGENATION PROCESS IN WASTETREATMENT:

GLYCOLATE DEHALOGENATION BASE1CATALY2ED DECOMPOSITIO


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GLYCOLATE DEHALOGENATION

Use $' &emi&+" -e+!e*t &+""e,

APEG

4 st+*,s '$- AL5ALI METAL HYDRO6IDE

EG4 '$- POLYETHYLENE GLYCOL

SODIUM HYDRO6IDE POTASSIUM HYDRO6IDE

POTASSIUM ETHYLENE GLYCOLATE is tem$st &$mm$* APEG -e+!e*t


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GLYCOLATE DEHALOGENATION

Te i,e+ is t$ &$*.e-t te +"$!e* t$form a non-toxic salt 7# -e+&t /it+"8+"i met+" #,-$%i,e

A*, te* 3PEG4 t+8es te "$&+ti$* i* tePCB m$"e&"e '$-me-"# $&&ie, 7# te+"$!e* m+8i*! it less hazardous


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e -$&ess &$*sists $' 9.e stes :

Ste : PREPARATION

C$*t+mi*+te, /+ste (s$i"; '$- e%+m"e) ise.+&+te, +*, si'te, t$ -em$.e ,e7-is +*, "+-!e$7


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A!E-CATALY"ED DECO#$O!ITION

C$*t+mi*+te, s$i" is e.+&+te, +*, s&-ee*e, t$-em$.e ,e7-is +*, "+-!e +-ti&"es; te* &-se,+*, mi%e, /it s$,im 7i&+-7$*+te

Te mi%t-e is e+te, i* + -e+&t$-Te e+t se+-+tes te +"$!e*+te, &$m$*,s'-$m te s$i" 7# e.+$-+ti$*

Te s$i" "e't 7ei*, is -em$.e, '-$m te -e+&t$-+*, &+* 7e -et-*e, t$ te siteTe &$*t+mi*+te, !+ses &$*,e*se, i*t$ "ii,'$-m te* +ss i*t$ + "ii,1+se -e+&t$-

Te ,e+"$!e*+ti$* -e+&ti$* $&&-s /e*s$,im #,-$%i,e (+ 7+se) is mi%e, /it te&$*,e*se, &$*t+mi*+*ts +*, e+te, i* te-e+&t$-

Te "ii, mi%t-e &+* 7e i*&i*e-+te, $- t-e+te,7# $te- te&*$"$!ies +*, -e&"e,


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REDUCTION

OFHE6AVALENT

CHROMIUM


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THE END OF THE PRESENTATION;

YOU WILL BE ABLE TO UNDERSTAND :

WHATIS CHROMIUM HOWHE6AVALENT CHROMIUM IS FORM WHERETHIS SUBSTANCE CAN BE FOUN

WHYHE6AVALENT CHROMIUM ISDANGEROUS HOWTO REDUCE THE HE6AVALENT

CHROMIUM


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INTRODUCTION TO CHROMIUM

TRIVALENT FORM

HE6AVALENT FORM

ESSENTIAL NUTRIENT FOR HUMANS NON1TO6IC

At$mi& *m7e- =@

A +-, si".e- met+" se, i* st+i*"ess stee" +*, $te- +""$#s

1 FOUND IN STEEL; CHEMICAL; LEATHER ANDTE6TILE MANUFACTURING1 WATER AND SOIL POLLUTION

1 DANGER TO HUMAN HEALTH ALTER GENETIC MATERIAL CARCINOGENIC ORGAN DAMAGE FATAL


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INTRODUCTION TO CHROMIUM

HE6AVALENT CHROMIUMC + * 7 e i * :

MISTS m$"te* met+" DUSTS !-i*,i*! $-

&tti*! FUMES t$-& &tti*!

+*, /e",i*! $e-+ti$*s


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%HE&E HE'A(ALENT CH&O#I)# * Cr +I(,

CAN E O)ND.

WELDING FUMES

METAL COATING PROTECTIVE PAIN

DYES AND PIGMENTS


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#ethods to detect Cr +III, and

Cr+(I,

ATOMICABSORPTION

(AA)

SPECTOMETRY

ION E6CHANGECHROMATOGRAPH

Y


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HE'A(ALENT CH&O#I)# %A!TE

T&EAT#ENT

Te-e +-e =1st+!es $' t-e+tme*t: STAGE Re,&e C-$mim (VI) t$ C-$mim (I STAGE = 1 Net-+"i+ti$*


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I&!T !TAGE

&educe chromium +(I, to chromium +III

Usi*! -e,&i*! +!e*ts: S"'- ,i$%i,e; S$,im 7is"+te;

O- s$,im1met+17is"9te

A&i, :S"-i&

+&i,


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SECOND STAGE

(Net-+"i+ti$*)

A,,i*! C+"&im#,-$%i,e ("ime) t$ te/+ste/+te-

I*&-e+se +*, m+i*t+i*H $' $- i!e-

F$- te -e&iit+ti$* $'&-$mim #,-$%i,e t$$&&-


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Te*; te -e&iit+te&+* 7e e+si"#se+-+te,($&&"+ti$*;&$+!"+ti$* +*,

se,ime*t+ti$*) +*,te* ,is$se C$""e&te, +ss",!e


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M+i* ,is+,.+*t+!es $' tis

t-e+tme*t met$, +-e:

Nee, t$ -e,&e /+ste/+te- H7et/ee* =

+*, > t$ +ss-e -+i, +*, &$m"ete-e,&ti$* Te +&i,i& /+ste/+te- *ee, t$ 7e

*et-+"ie,7e'$-e ,is&+-!e

Tese stes &$*sme "+-!e +m$*t $'&emi&+"s+*, te*, t$ i*&-e+se te.$"me $' s",!e /it *-e+&te,-e&iit+*ts


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END O TO$IC

dehalogenation and hexavalent chomium

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