The efficiency of anaerobic biofilters (AnBF) as low-cost wastewater treatment systems was investigated. Miscanthus-biochar was used as filtration media and compared with sand as a common reference material. Raw sewage from a municipal wastewater treatment plant was stored in a sedimentation tank for two days to allow pre-settlement of wastewater particles. Subsequently, wastewater was treated by AnBFs at 22 °C room temperature at a hydraulic loading rate of 0.05 m∙h-1 with an empty bed contact time of 14.4 h and a mean organic loading rate of 509 ± 173 gCOD∙m-3∙d-1. Mean removal of chemical oxygen demand (COD) of biochar filters was with 74 ± 18% significantly higher than of sand filters (61 ± 12%). In contrast to sand filters with a mean reduction of 1.18 ± 0.31 log-units, E. coli removal through biochar was with 1.35 ± 0.27 log-units significantly higher and increased with experimental time. Main removal took place within the schmutzdecke, a biologically active dirt layer that develops simultaneously on the surface of filter beds. Since the E. coli contamination of both filter materials was equal, the higher removal efficiency of biochar filters is probably a result of an improved biodegradation within deeper zones of the filter bed. Overall, performance of biochar filters was better or equal compared to sand and have thus demonstrated the suitability of Miscanthus-biochar as filter media for wastewater treatment.

中文翻译：

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使用生物炭作为替代过滤介质，对原废水进行慢速砂滤。

研究了厌氧生物滤池（AnBF）作为低成本废水处理系统的效率。芒草生物炭被用作过滤介质，并与沙子作为普通参考材料进行了比较。来自市政废水处理厂的原污水在沉淀池中存储两天，以允许废水颗粒的预沉降。随后，废水在22°C的室温下通过AnBFs进行处理，水力加载速率为0.05 m∙h-1，空床接触时间为14.4 h，平均有机物加载速率为509±173 gCOD∙m-3∙ d-1。生物炭滤池的平均化学需氧量（COD）去除率比砂滤池（61±12％）高74±18％。与平均减少1.18±0.31 log单位的沙滤池相比，通过生物炭去除大肠杆菌的效率为1.35±0。27个对数单位显着升高，并随实验时间增加。主要去除发生在schmutzdecke内，schmutzdecke是一种具有生物活性的污垢层，它同时在滤床表面上形成。由于两种过滤材料的大肠杆菌污染相等，生物炭过滤器的较高去除效率可能是由于滤床深层中生物降解得到改善的结果。总体而言，生物炭滤池的性能优于或等同于沙子，因此证明了芒草生物炭作为废水处理滤池的适用性。两种过滤材料的大肠杆菌污染程度相等，生物炭滤池的较高去除效率可能是由于滤床深层生物降解能力提高的结果。总体而言，生物炭滤池的性能优于或等同于沙子，因此证明了芒草生物炭作为废水处理滤池的适用性。两种过滤材料的大肠杆菌污染程度相等，生物炭滤池的较高去除效率可能是由于滤床深层生物降解能力提高的结果。总体而言，生物炭滤池的性能优于或等同于沙子，因此证明了芒草生物炭作为废水处理滤池的适用性。