�Ƹ﹤�I(y��)��Cr3+�Ļ��ԇ�(y��n)

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1,��ԇ�(y��n)��

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�ڳ��ԇ�(y��n)�͌�(du��)��ԇ�(y��n)��ʹ�õ��ˮ��Cr3+��|(zh��)��Ⱦ��1000mg/L��r(ji��)�t�}��sˮ��ƶ��,��ڌ�(du��)��ԇ�(y��n)��,��ַքe��Fe3+��AL3+,��Ca2+,��Mg2+,��õ��ĽY(ji��)��c��κ��x�ӵ��ˮ��Cr3+��Y(ji��)��^��u(p��ng)�r(ji��)��ȡҺ��ڵ�Fe3+��Al3+,��Ca2+,��Mg2+��(du��)Cr3+��^�̵�Ӱ�,��

2,��Cr3+��

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2Cr(OH)2++3H2O2+8OH-→2CrO42-+8H2O

��?y��n)��pH=10�ėl��,��Cr3+��Cr(OH)2+�j(lu��)��ʽ��ڣ��,��(y��ng)��Cr3+��|(zh��)��h(yu��n)�h(yu��n)��ԓ��B(t��i)�µ���ܽ��,��ԕ�(hu��)��Cr3+��|(zh��)��ɣ�ʹ��ʾ��Ҫ��L��(y��ng)�r(sh��)�g��߷��(y��ng)�ض�,��

�ڳ��ԇ�(y��n)��ȡ�õĔ�(sh��)��(j��)��A(ch��)��,��҂��θ=60�棬t=30min,��pH=10,��R=1.5�鷴��(y��ng)�Ļ��l��(du��)��ȡҺ�е�Cr3+�M(j��n)��ԇ�(y��n)��ԓ��(y��ng)�l��H�@��60%��,��,��M(j��n)һ��ԇ�(y��n)��n(H2O2)�cn(Cr3+)�ı�ֵR��ȡ��^�ߵ��,��P(gu��n)ԇ�(y��n)�Y(ji��)��Ҋ��3,��

��˽��ȡ��ͬ��ʵ�ǰ��£��ڌ�(du��)��ȡҺ��^��Ҫ�^��H2O2Ͷ�ӱ�R��ԭ��,��҂��(du��)��ȡҺ��Fe3+,��Al3+,��Ca2+��Mg2+��(du��)��M(j��n)�̵�Ӱ��ˌ�(du��)��ԇ�(y��n),��Y(ji��)��l(f��)�F(xi��n)��Fe2+��Mg2+�Ĵ��ǌ�(d��o)��^��H2O2Ͷ�ӱ��^�ߵ��Ҫ��,��{(di��o)��(ji��)��ȡҺ��PH�^��У�F(xi��n)e2+��Mg2+�܉��Cr2+�γɱ��^�y�ܽ��ĳ�N�j(lu��)��,��ʹ��(g��)��M(j��n)�̜p��,��(d��o)��Ͷ�ӱ��^�ߡ�

�ڲ�ͬ��n(Fe2++Mg2+)/n(Cr3+)ֵ(N)�Լ��ò�ͬRֵ��r��,��Cr3+��ʵ�ԇ�(y��n)�Y(ji��)��Ҋ��4,��4�е�ԇ�(y��n)��(sh��)��(j��)��(du��)��^�̾��к��Ҫ��x��҂��Ը��(j��)��Ҫȡ�õ��Լ��ȡҺ�е�Nֵ�_��H2O2��Ͷ�ӱ�R,��

3,��x�ӵ�ȥ��

��(j��ng)�^��ȡҺ��߀��x�ӣ��@Щ�x�Ӱ��Fe3+,��Al3+,��Ca2+��Mg2+�Լ��΢��Ľ��x��,��,��Ҫ��Cr߀��Ҫ��@Щ�x��ȥ��(sh��)�(y��n)��ԇ�(y��n)��P(gu��n)�о��(b��o)��x�ӵ�ȥ��^��,��@��(g��)�A�ε�Ч�ʸ�,��@��(g��)�A�β��Ӱ푿��Ч�ʵ��P(gu��n)�I�A�Ρ�

��ȥ��Fe3+,��Al3+��(y��ng)��Ȍ��Һ��PH�{(di��o)��(ji��)��7-8֮�g,��ʹFe3+��Al3+�Գ��ʽ��ڣ�ͨ�^�^�V�ķ��(20-50Ŀ�V��)��ȥ��,��ֵ��ע��Ҫ��ȫȥ��Al3+,��^�V֮ǰ�茢��Һ��pH=7-8��ضȞ�60��Ġ�B(t��i)��,��ͣ��30min,��(j��ng)�^�^�V̎��󣬞VҺ��߀��е�Ca2+,��Mg2+�Լ��΢��Ľ��x��,��@Щ��x�ӿ��ͨ�^Na��x�ӽ��Q��֬��ȥ��(j��ng)�^�x�ӽ��Q��Ca2+,��Mg2+�x�ӿ��Խ��͵��z�y��ˮƽ,��

4��Cr�Ļ��

��(j��ng)�^��̎��,��Ϳ��Եõ��^��Cr6+,��Լ��ӽ��Ե��r��Cr��Cr2O72-��ʽ��,��Ƹ﹤�I(y��)��Ҫ��r(ji��)�t�ĉAʽ��}��Ҫ��õ��Cr2O72-�M(j��n)һ��߀ԭ,��SO2��Ԍ��߀ԭ��r(ji��)�t�ĉAʽ��},��W(xu��)��(y��ng)��ʽ��£�

Cr2O72-+3SO2+11H2O→2Cr(OH)(H2O)5SO4+SO42-

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5,��Y(ji��)Փ

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