基于协同反硝化脱氮的光伏废水处理

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Abstract Photovoltaic wastewater was used as the influent of a combined heterotrophic and sulfur-based autotrophic denitrification reactor. When the influent F^- concentration was 800mg/L, NO₃^--N concentration was 350mg/L, TOC/N was 0.7, the nitrogen removal rate and denitrification efficiency of the reactor reached 2.0~2.5kg/(m³·d) and 90% above without pH adjustment. Defluorination experiments indicated that F^- concentration of photovoltaic wastewater was decreased to 800mg/L by adding calcium oxide. Meanwhile, the pH of the wastewater was raised to 7.68, which met the pH(7.5~8.5) requirement of the combined denitrification. The remaining F^- and generated SO₄^2- in combined denitrification were removed effectively by secondary defluorination. Photovoltaic wastewater containing high F^- concentration (800mg/L above) could be treated by preliminary defluorination, combined denitrification and secondary defluorination. In terms of the cost of denitrification in photovoltaic wastewater treatment, the combined denitrification could save 0.82yuan/t compared with unit cost of the heterotrophic denitrification.

Key words： heterotrophic denitrification sulfur-based autotrophic denitrification photovoltaic wastewater defluorination

Received: 18 May 2016

PACS:

X703.1

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	Articles by authors
	MA Hang
	LI Xiang
	HUANG Yong
	WEI Fan-kai

Cite this article:

MA Hang,LI Xiang,HUANG Yong等. Photovoltaic wastewater treatment based on a combined heterotrophic and sulfur-based autotrophic denitrification technology[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(12): 3672-3677.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2016/V36/I12/3672

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