|Table of Contents|

Low temperature biological treatment of photovoltaic industrial detergent wastewate*(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2016 03
Page:
388-392
Research Field:
Articles
Publishing date:

Info

Title:
Low temperature biological treatment of photovoltaic industrial detergent wastewate*
Author(s):
LAN Shuhuan12 CHEN Yangwu2 HE Yulong1 TAO Mei12 ZHANG Ruomu2 LI Long2 MA Xiaoya2 & TAN Zhouliang2**
1Southwest Jiaotong University, Chengdu 610031, China 2Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
Keywords:
photovoltaic industry detergent agent wastewater biological treatment optimal regulation low temperature pH C/N
CLC:
X172
PACS:
DOI:
10.3724/SP.J.1145.2015.10008
DocumentCode:

Abstract:
A large amount of detergent wastewater is produced by photovoltaic industry. Its biological treatment effect in winter is unsteady and hard to meet the discharge standard. This research aimed to offer suggestions in biodegrading detergent wastewater of photovoltaic industry by adjusting the relevant operation parameters and optimizing processes. We investigated in laboratory scale the effect of temperature on the detergent wastewater treatment, and the influence of pH, C/N and different treatment processes on the detergent wastewater treatment at low temperature. The chemical oxygen demand (COD) removal ratio and removal rate of the detergent wastewater was also monitored. The results showed that the biological degradation efficiency of detergent wastewater was poor at 10 °C, where the wastewater COD removal ratio was only 49.7% at 21.5 h, 31.0% less than that at 30 °C. The pH value >7 was more favorable for treating the wastewater, with the COD removal efficiency of pH 8 57.2% higher than that of pH 5.5. The initial C/N between 8:1 and 32:1 was beneficial to the detergent wastewater degradation. Stagnation phenomenon was found in the late stage of biological treatment. The optimization experiment showed that the contact oxidation method obtained an average of 7.5% higher COD removal efficiency than the activated sludge process. In addition, the two-stage contact oxidation process achieved 16.6% enhancement in COD removal efficiency in the second treatment unit. In conclusion, under the condition of 15 °C, pH 7–8, C/N 16:1, the two-stage contact oxidation process promoted the degradation of the detergent wastewater, with the final effluent meeting the primary standard of National Sewage Comprehensive Emission Standard” (GB 8978-1996 ). This research achieved effective treatment of detergent wastewater by the two-stage contact oxidation process, but further studies are needed to determine wastewater degradation kinetics and mechanism of microbial degradation in the two-stage contact oxidation system at low temperature.

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Last Update: 2016-06-25