Watari Takahiro, Cuong Mai Trung, Tanikawa Daisuke, Hirakata Yuga, Hatamoto Masashi, Syutsubo Kazuaki, Fukuda Masao, Nguyen Ngoc Bich, Yamaguchi Takashi
Department of Civil and Environmental Systems Engineering, Nagaoka University of Technology, 1603-1, Kamitomioka, Nagaoka, Niigata 940-2188, Japan E-mail:
Rubber Research Institute of Vietnam, Km42 Road 13, Ben Cat District, Binh Duong Province 827211, Vietnam.
Water Sci Technol. 2017 Jan;75(1-2):57-68. doi: 10.2166/wst.2016.487.
Conventional aerated tank technology is widely applied for post treatment of natural rubber processing wastewater in Southeast Asia; however, a long hydraulic retention time (HRT) is required and the effluent standards are exceeded. In this study, a downflow hanging sponge (DHS) reactor was installed as post treatment of anaerobic tank effluent in a natural rubber factory in South Vietnam and the process performance was evaluated. The DHS reactor demonstrated removal efficiencies of 64.2 ± 7.5% and 55.3 ± 19.2% for total chemical oxygen demand (COD) and total nitrogen, respectively, with an organic loading rate of 0.97 ± 0.03 kg-COD m day and a nitrogen loading rate of 0.57 ± 0.21 kg-N m day. 16S rRNA gene sequencing analysis of the sludge retained in the DHS also corresponded to the result of reactor performance, and both nitrifying and denitrifying bacteria were detected in the sponge carrier. In addition, anammox bacteria was found in the retained sludge. The DHS reactor reduced the HRT of 30 days to 4.8 h compared with the existing algal tank. This result indicates that the DHS reactor could be an appropriate post treatment for the existing anaerobic tank for natural rubber processing wastewater treatment.
传统曝气池技术在东南亚被广泛应用于天然橡胶加工废水的后处理；然而，需要较长的水力停留时间（HRT）且出水超标。在本研究中，在越南南部一家天然橡胶厂安装了下向流悬挂海绵（DHS）反应器作为厌氧池出水的后处理，并对该工艺性能进行了评估。DHS反应器对总化学需氧量（COD）和总氮的去除效率分别为64.2±7.5%和55.3±19.2%，有机负荷率为0.97±0.03 kg-COD/m²·d，氮负荷率为0.57±0.21 kg-N/m²·d。对DHS中保留的污泥进行的16S rRNA基因测序分析也与反应器性能结果相符，在海绵载体中检测到了硝化细菌和反硝化细菌。此外，在保留的污泥中发现了厌氧氨氧化细菌。与现有的藻池相比，DHS反应器将水力停留时间从30天缩短至4.8小时。这一结果表明，DHS反应器可能是现有天然橡胶加工废水处理厌氧池的合适后处理工艺。
