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1·��߀ԭ��

��߀ԭ��ָͶ��߀ԭ��r�t߀ԭ��r�t,��m��pHֵ,��Cr(OH)3��,��x�ķ��ͨ��߀ԭ�γ��r�t��,�c��ؽ��x��һ��,��

1.1 ��r�t�Ĵ��ʽ

1.2 ��߀ԭ��䷴��ʽ

(1)��၆�F(FeSO4·7H2O)

�c��r�t��Ͷˎ��≥16��1,��ɴ��F��,��ѱ��̭,��

(2)��c(NaHSO3)

�c��r�t��Ͷˎ��≥4��1,�䷴��ʽ��:2H2Cr2O7+6NaHSO3+6HCl=2Cr2(SO4)3+6NaCl+8H2O(1)

(3)��c(Na2S2O5)

�c��r�t��Ͷˎ��≥3��1,�䷴��c��c��ͬ,ԭ��:

(4)ˮ��(N2H4·H2O)

��Ʒ�c��r�t��Ͷˎ��Դ��1,��I(y��)��Ʒ��|��֔�һ��40%��,�䷴��ʽ��:

��t��ˮ��߅̎��̎��,��t��|��֔��_39.2%,��ڻ��á�

(5)��w߀ԭ��

��w߀ԭ��߀��c,��c,��B��c�ȡ��]ُ�I��,�F��ý��c,��

1.3 ߀ԭpHֵ�c��r�g

1.3.1 ߀ԭpHֵ

��߀ԭ��Ҫ��Ĵ��H+,��߀ԭpHֵ��2.5~3.0��,��pHֵԽ��,߀ԭ��Խ��,߀ԭ��r�tԽ�ص�;��pHֵ�ߕr,Ͷˎ�ȼӴ�,��߀ԭ��ˮCOD��,��߀ԭǰ��Ͷ��,��ؽ��Ҫ��Ͷ�A(�؄e��кͳ��),�H��һ헾��ˏUˮ̎��ĳɱ�(�؄e��r�t��|��ȱ��ߵĻ�ϏUˮ)��

1.3.2 ��r�g

��pHֵ��2.5�r,�ý��c��Ͷˎ��3��1�M�з��,Ȼ��NaOH�{��Һ��pHֵ��6.7~7.0,��r�t��|��Ȟ�3g/L�r,��r�g��36min;��r�t��|��≤0.5g/L�r,��4min,��̎��UҺ,��ĕr�L,��

1.4 ��t��(w��n)��ڵėl��

1.4.1 �m��pHֵ

��r�t�γ�Cr(OH)3��pHֵ��ޞ�5.6��Ԛ��,��pHֵ≥12�r�_ʼ��,��15�r��ȫ�ܽ�,��Ɂ��t��}��:

��,��{��pHֵ�r,��ֹ�ֲ�pHֵ�^�߶�ʹ��t��,��

1.4.2 ��̎��

��r,��ý��|��A��c��u�r,ֻ�ܟ��u;��Ƽt�u�r��,��r�t��r�t,��

1.5 ߀ԭ�r��ԄӜy��

��茦Ͷ��߀ԭ��|��ԄӜy�ؕr,��ORPӋ(��߀ԭ�λ��Ӌ),��pHֵ��2.5�r,�y��ORPֵ��250mV��

1.6 �Á��c�r�ĸ��

��Á��c�򽹁��c��߀ԭ��r,��l(f��)��:

��ɵĶ��ˮ��Ɍ��r�t��߀ԭ��:

��Ԛ��w��ʽ�ݳ�,�t��Ⱦ�՚�,��a��,��Ƿ�ʚ��w�ݳ�,ȡ�Q��ˮ�е��ܽ��,Һ��Խ��,��ֲ��Խ��,Խ��ݳ��Ͷ��߀ԭ��r,��ڔ��l��,��Ͷ��,��

1.7 �m�÷��

Ͷ��߀ԭ��̎��,�H�m��ڌ��r�t�Uˮ�M��J��|�ŷŵĆ�λ,��ڷ��|�r,��t�Uˮ�c��ϴ��ϴˮ(һ��Զ��)��,�@�ӿ��Ч��̎��ɱ�,��F��ϴ��ϴˮ�е�Fe2+Ҳ��߀ԭ��r�t��á�

2·�^�}��

2.1 ��(y��u)�c

(1)��Ͷ��߀ԭ��r�t,�؄e��ϏUˮ��,��һ��ϏUˮpHֵ��5~6֮�g,��^�}��pHֵ��(��r�t��|��0.04~0.05mg/L֮�g),��Hʹ��BaCl2·H2O�r,pHֵ��6.7~7.5֮�g,ԭ��Ƿ��ɵ��}��Խ��pHֵ;��̼��^��^�r,pHֵ��2.5~4.0֮�g,��t��y��,��

(2)��Ó��Cr(OH)3�ă��Ԇ��},��

(3)̎��ɱ��^��,��ֱ��Ͷ�Ӹɷۺ��ܡ�

2.2 ȱ�c

(1)��^�}��ж��,��ʹ�Õr��ע�ⰲȫ��,�a��I(y��)Σ�U�U��̎��PҎ(gu��)��(zh��)��,��

(2)�Uˮ�К��^��ȥ��,��}��^�V;Ҳ�Ɍ��Uˮ��{��pHֵ��ؽ��ٺ�,�ڔ��С�ļ��ϡ��{��pHֵ�s0.3~0.5,��

3·��}߀ԭ��r�t

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