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��T�P�I�֣� PM2.5 VOCs �h(hu��n)�� COD

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1 ǰ ��

�Ļ��ų��ďUҺ,��֞�o�C��ЙC�,��ŷ��@Щ�U��r��ʹ��(sh��)��,��Ҳ��ɭh(hu��n)��Ⱦ,��,��ֱ�ӌ��@Щ�U��ŷŵ��Ȼˮ��ȥ��횼��m��̎��,��ˌ��ҏU��Пo�CUҺ��һЩ̎��ʾ��,��

2 ��ҟo�CUҺ��̎��

2.1 ��r�t��k,��U�UҺ

2.1.1 ��t�UҺ ��߀ԭ,��кͷ��c��Cr��Փ��Ի�A�ԗl��,��Է�(w��n)��t��x�Ӡ�B(t��i)��,��ˣ��ʽ��Cr��߀ԭ��Cr��󣩺��M��к�,��ʹ֮��y�� Cr��OH��₃��ȥ��

4H₂CrO₄+6NaHSO₄+3H₂SO₄→ 2Cr2��SO₄��₃+3Na₂SO₄+10H₂O

Cr2��SO₄��₃+6NaOH→2Cr��OH��₃+3Na₂SO₄

��E��

��1��UҺ�м��H₂SO₄,��{��ҺpHֵС��3��t��Һ֮UҺ��|,��{��pHֵ��,��

��2��ִ��߅��߅��NaHSO₃�Y��Һ��Sɫ׃?y��u)�Gɫ��ֹ,��

��3��Cr��߀��ٕr,��_��Cr��D��ؽ��ٵďUҺ̎��,��

��4��UҺֻ��Cr�ؽ��ٕr,��Ȟ�5%��NaOH��Һ��{��(ji��)pHֵ��1.5��8.5,��

��5��VҺ�M��ȫ�t�z�y,��_��VҺ��t��ſ��ŷš�

��,��Ï��A��x�ӽ��Q��֬��Cr��,��ͺ��t��Ҳ��Ч�,��߀ԭ�t��߀ԭ��Te,��TeSO₄.7H₂O��Na₂SO₃,��NaHSO₃,��SO₂�� Ca��OH��₂Ҳ��к̈́�,��߀ԭ1gCrO₃��Փ��Ҫ��ˎƷ��Ҋ��1,��

��1 ߀ԭ1gCrO₃��Փ��Ҫ��ˎƷ�� g

߀ԭ��	��	H₂SO₄
Te	0.56	2.94
TeSO₄.7H₂O	8.43	2.94
Na₂SO₃	1.89	1.47
NaHSO₃	1.56	0.74
SO₂	0.96	��

ע��헣�

��1��Cr��߀ԭ��Cr��󣩺�Ҳ��Ԍ��c��ؽ��ُUҺһ��̎��̎��r��o��R,��Ƥ��,��ͨ�L��M�С�

��2��t��Һ��ԏ�,��ϡጵ��s1%�ĝ��֮��߀ԭ,��ȫ��Һ��߀ԭ�ɾGɫ�r��_��r�t��,��ٰ��E�е��c�M��̎��,��

��3��ؽ��كɷN��ϕr��ע��̎��r��m�˵�pHֵ��ͬ,��

��4��ЙC��軯��ďUҺ��нj�x�ӕr,��A�Ȍ��ֽ��ȥ,��

2.1.2 ��k��U�UҺ ��Ú��ﹲ��,�� Ca��OH��₂��Cd2+ ,��Pb2+�D��y��ˮ��Cd��OH��₂��Pb��OH��₂��x��

Cd2++Ca��OH��₂→Cd��OH��₂↓+Ca₂+

Pb2++Ca��OH��₂→Pb��OH��₂↓+ Ca₂+

pHֵ��11��r,��Cd��OH��₂��ܽ��С,��{��(ji��)pHֵ��Ҫ��

��E��

��1��ڏUҺ�м��Ca��OH��₂,��{��(ji��)pHֵ��10.6��11.2,��֔��á�

��2��^�V�όӳ��Һ,��z��VҺ�д_��Cd2+�x�ӕr,��кͺ󼴿��ŷš�

��3��ڏUҺ�м��Ca��OH��₂,��{��pHֵ��11,��

��4��Al2��SO₄��₃��ۄ��H₂SO₄�{��(ji��)pHֵ,��ʹ�併��7��8,��

��5��Һ��ã��ֳ��^�V,��z��VҺ��Pb2+�󼴿��ŷ�,��

2.2 ��軯��UҺ

��ȉA��ú��N2��CO₂,��ɂ��A��M�У�

NaCN+NaOCl→NaOCN+NaCl ��1��

2NaOCN+3NaOCl+H₂O→N2↑+3NaCl+2NaHCO₃ ��2��

��1��ʽ��pHֵ��10�ėl��M��,��pHֵ��10�ͼ��l(f��)��·��

HCN+NaOCl→CNCl↑+NaOH

�a��̼��Ժܴ��к��wCNCL��̎��r��؄eע��,��

��E��

��1��UҺ�м��NaOH��Һ,��{��(ji��)pHֵ��10��Ȼ��s10%��NaOCl��Һ,��

��2�� 5%��10%��H₂SO₄��HCl��,��{��(ji��)pHֵ��7.5��8.5��

��3��Na₂SO₃��Һ,��߀ԭʣ��ȣ��΢�^��r,��ÿ՚��

��4��UҺ�_��]��CN-�x�Ӻ�,��ſ��ŷ�,��Cu2+��Ni+��x�Ӵ��,��횼��^��,��

ע��헣�

��1��̎��r�ų��ж��w��ͨ�L��M��,��

��2��UҺ�ƳɉA�r,��Ҫ��r��ֱ�Ӵ�š�

��3��y�ڷֽ��軯���Zn,��Cu,��Cd��Ni,��Co,��Fe��Ľj����Լ��ЙC�軯��ďUҺ,��ռ�̎��,��

��4��ؽ��ٵďUҺ��ڷֽ��,��M��ؽ��̎��,��

2.3 ��UҺ

��Ú��ﹲ��UҺ�M��̎��кͷ��ܰ�As��,��ͨ��cCa,��Mg��Ba,��Fe,��Al�Ț��ﹲ��x��ȥ��Fe��OH��₃�r,��m�˵ėl��ǣ��F��ȣ�Fe/As��30��50,��pHֵ��7��10,��

��E��

��1��UҺ�к�As��r��Ca��OH��₂��Һ,��{��(ji��)pHֵ��9.5,��ȳ��xһ��顣

��2��VҺ��,��FeCl3,��ʹ��F��_��50��ÉA�{��(ji��)pHֵ7��10֮�g,��,��

��3��VҺ�^�V��z��VҺ��,��кͺ󼴿��ŷ�,��˷��ʹ��ĝ�Ƚ��0.05×10-6��¡��߀��HCl��ữ��,��Ȼ��H₂S��NaHS��ԇ��ʹ֮��û��̿,��Ե\��

ע��헣�

��1��As2O₃�Ǆ��|,��UҺ�к��_��0.5×10-6�r��M��̎��

��2��ЙC�黯��r,��Ȍ��ֽ�,��Ȼ��M��̎��

2.4 ��UҺ

��ﹲ��,��Na₂S��NaHS��Hg2+�D׃?y��u)��y��ˮ��HgS,��ʹ��cFe��OH��₃��x��ȥ��ע��,��ɽj�x��,��̎��r횿��]��Ĵ��ʽ��NaHS��ZnCl2��Na₂S+FeSO₄,��Ԍ��O΢��ĳ̶�,��磺��10×10-6�ďUҺ1L��pHֵ��10.3,��32mgNaHS��80mg ZnCl2̎��,��Hg��ȿɽ��0.003×10-6��

�UҺ��Դ�,��΢��ȵ��ú�,��׃�ɶ��Ը��ЙC��,��UҺ�еĝ�ȳ��^0.005×10-6�r��ְ�ȫ��̎��,��֮��ЙC��UҺ,��Ȍ��ֽ��D׃?y��u)�o�C��Ȼ��M��̎��,��

2.5 ��ؽ��ٵďUҺ

��ؽ��x��D׃��y��ˮ�Ě��}�,��Ȼ��M�й��ȥ��

2.5.1 ��

��1��ڏUҺ�м��FeCl3��Fe2��SO₄��₃,��֔��,��

��2��Ca��OH��₂�Ƴ�ʯ��飬Ȼ��UҺ��,��{��pHֵ��9��11��pHֵ�^��,��ܽ⣩��

��3��Һ��ú�,��^�V��,��z��VҺ�в��ؽ��x�Ӻ��к��ŷš�

2.5.2 ��

��1��UҺ��ؽ��ٵĝ��Ҫ��ˮϡጵ�1%��,��

��2��Na₂S��NaHS��Һ,��֔��衣

��3��NaOH��Һ,��{��pHֵ��9.0��9.5,��

��4��FeCl3��Һ��{��pHֵ��8.0��Ϸ��,��

��5��ÃA��^�V��,��z��VҺ�_��ؽ��x�ӡ�

��6��ٙz��VҺ�ПoS2-,��,��H₂O₂��кͺ󼴿��ŷ�,��

ע��헣�

��1��ЙC��,��j�x�Ӽ��ďUҺ��Ȍ��ֽ��ȥ,��

��2��Cr��CN��|�r,��ҲҪ�M��̎��

��3��UҺ�к��ɷN��ؽ��ٕr,��̎��r��m�˵�pHֵ��ͬ,��

2.6 ��^��,��UҺ

��1��^��̎��ڏUҺ�м��Na₂SO₄��Һ,��^�V��ɵĳ��󣬼��ŷ�,��

��2��̎��UҺ��s,��x�ӽ��Q��֬��,��ؽ��ٵďUҺ��ؽ��ُUҺ��̎��̎��,��

��3��̎��UҺ�м��ʯ��,��UҺ��ȫ�ʉA�Ԟ�ֹ��֔��,��һ�Εr�g��^�V,��VҺ��A�UҺ̎��

2.7 ��,��߀ԭ��ďUҺ

��1��􌢸��,��߀ԭ��ϛ]��Σ�U�r��߅��߅��һ�N�UҺ�ִ��һ�N�UҺ��,��

��2��ȡ��Һ,��{��ԣ��õ⻯�—��ԇ��M�Йz�,��

��3��ԇ��׃�{�r��^��,��{��pHֵ��3��Na₂SO₃��Na₂S2O₃,��FeSO₄��Һ��ԇ��׃�ɫ��ֹ,��֔��á�

��4��ԇ��׃�{�r��߀ԭ��^��,��{��pHֵ��3,��H₂O₂ʹԇ��׃ɫ��ֹ��Ȼ��Na₂SO₃��,��

��5��һ�N��r��Ҫ�ÉA�к��pHֵ��7,��ʹ�京�}��5%��,��ſ��ŷš�

ע��헣�

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��2��t��}�r,��麬Cr��ďUҺ̎��

��3��ؽ��|�r,��麬�ؽ��ٵďUҺ̎��,��

��4��к��|��1%��µďUҺ��кͺ󼴿��ŷ�,��

2.8 ��,��A,��}��|�ďUҺ

ԭ�t�ό��ᡢ�A,��}UҺ�քe�ռ�,��Ҳ�Ɍ��以��ϣ��̎��ďUҺ,��ؽ��ټ��ďUҺ,��Ҫ�քe�ռ�̎��ϡ��Һ,��ô��ˮϡጵ� 1%��µĝ�Ⱥ�,��ŷš��,��A�UҺ��ϛ]��Σ�U�r�ɷִ��һ�N�UҺ��һ�N�UҺ��,��pHֵԇ��z򞣬��A�ԏUҺʹ��Һ��pHֵ�s��7,��߀��ˮϡ�,��ʹ��Һ�ĝ�Ƚ��5%��¼��ŷš�

3 �Y �Z

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