Abstract A pre-treatment system, circulation tank was proposed for residual rubber removal from natural rubber (NR) wastewater. The main treatment system consisted of an anaerobic baffled reactor (ABR) and a down-flow hanging sponge (DHS) reactor. An additional DHS reactor (post-DHS) was installed after ABR-DHS system as a post-treatment for nitrogen removal. In the pre-treatment circulation tank, the contact numbers with seed rubber was considered a key factor in the coagulation of residual rubber. Furthermore, the aerobic conditions enhanced the NR wastewater biodegradability in both ABR and DHS reactors. The post-DHS achieved single-stage nitrification-denitrification, using sodium acetate solution as a carbon source, under non-aeration conditions. Finally, the water quality of the final effluent met the quality standards of NR producing countries. In the ABR, hydrogen-utilizing methane-producing archaea, as well as syntrophic VFAs degrading bacteria, were the main bacteria contributing to the organic matter degradation in NR wastewater. On the other hand, most of the residual rubber in the NR wastewater was degraded in the DHS reactor by aerobic rubber-degrading bacteria (Gordonia).

中文翻译：

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增强天然橡胶工业废水处理的前处理和后处理系统

摘要 提出了一种预处理系统——循环池，用于去除天然橡胶（NR）废水中的残留橡胶。主处理系统由厌氧折流板反应器（ABR）和下流式悬挂海绵（DHS）反应器组成。在 ABR-DHS 系统之后安装了一个额外的 DHS 反应器（后 DHS）作为脱氮后处理。在前处理循环槽中，与胶种的接触次数被认为是残胶凝结的关键因素。此外，好氧条件增强了 ABR 和 DHS 反应器中 NR 废水的生物降解性。后 DHS 实现了单级硝化-反硝化，使用醋酸钠溶液作为碳源，在非曝气条件下。最后，最终出水水质符合天然橡胶生产国的质量标准。在 ABR 中，利用氢气产生甲烷的古细菌以及同养 VFA 降解细菌是促成 NR 废水中有机物降解的主要细菌。另一方面，NR废水中的大部分残留橡胶在DHS反应器中被好氧橡胶降解菌（Gordonia）降解。