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

1.1 ��r�t�Ĵ��ʽ

1.2 ��߀ԭ��䷴��(y��ng)ʽ

(1) ��c(NaHSO3)

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

(2)��၆�F(FeSO4·7H2O)

�c��r�t��Ͷˎ��≥16��1,��ɴ��F��,��ѱ��̭

(3)��c(Na2S2O5)

�c��r�t��Ͷˎ��≥3��1,�䷴��(y��ng)�c��c��ͬ,ԭ��:

(4)ˮ��(N2H4·H2O)

��Ʒ�c��r�t��Ͷˎ��Դ��1,��I(y��)��Ʒ��|(zh��)��?j��n)?sh��)һ��40%��,�䷴��(y��ng)ʽ�飺

��t��ˮ��߅̎��̎��,��t��|(zh��)��?j��n)?sh��)��_(d��)39.2%,��ڻ��á�

(5)��w߀ԭ��

��w߀ԭ��߀��c,��c,��B��c�ȡ��]ُ�I��,�F(xi��n)��ý��c,��

1.3 ߀ԭpHֵ�c��r�g

1.3.1 ߀ԭpHֵ

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

1.3.2 ��r�g

��(d��ng)pHֵ��2.5�r,�ý��c��Ͷˎ��3��1�M(j��n)�з��(y��ng),Ȼ��NaOH�{(di��o)��Һ��pHֵ��6.7~7.0,��(d��ng)��r�t��|(zh��)��Ȟ�3g/L�r,��r�g��36min;��(d��ng)��r�t��|(zh��)��≤0.5g/L�r,��4min,��̎��UҺ,��ĕr�L��

1.4 ��t��(w��n)��ڵėl��

1.4.1 �m��(d��ng)?sh��)�pHֵ

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