这项研究报告了非充气和充气未种植的性能,种植,微生物燃料电池种植湿地,用于稳定污水和处理排放的废水。这项研究的湿地系统在相对较短的时间内进行了间隔处理,即,20周,其次是60天的污泥干燥期。人工湿地的污泥负荷率在每年259至624kg总固体(TS)/m2之间。有机物,氮,剩余污泥的磷浓度在8512至66,374mg/kg之间,12,950和14,050mg/kg,4979和9129mg/kg,分别。植物的存在,电极,曝气改善了污泥脱水,降低了剩余污泥的有机质和养分浓度。重金属(Cd,Cr,Cu,Fe,Pb,Mn,Ni,和Zn)剩余污泥的浓度符合孟加拉国农业再利用的准则。化学需氧量(COD),氨态氮(NH4-N),总氮(TN),总磷(TP),从排出的废水中去除大肠杆菌的百分比在91%至93%之间,88%和98%,90%和99%,92和100%,75%和90%,分别。从排出的废水中去除NH4-N取决于曝气。污泥处理湿地的金属去除率(从排出的废水中)在90%至99%之间。累积污泥中的物理化学和微生物路线,根际,和介质有助于污染物的去除。输入负荷与有机物去除增量(来自排放废水)呈正相关;养分去除呈矛盾趋势。非充气和充气微生物燃料电池种植的湿地产生的最大功率密度在66至3417mW/m3之间。由于实验时间较短,这项研究揭示了初步的,但新的信息宏观和微观污染物去除途径在污水污泥湿地(有和没有电极),可用于设计中试或全面的系统。
This
study reports the performance of non-aerated and aerated unplanted, planted, microbial fuel cell planted wetlands for stabilizing septage and treating the drained wastewater. The wetland systems of this
study were dosed with septage for a relatively shorter period, i.e., 20 weeks, followed by 60 days of
sludge drying period. The sludge loading rates across the constructed wetlands ranged between 259 and 624 kg total solids (TS)/m2 per year. Organic matter, nitrogen, and phosphorus concentration of the residual sludge ranged between 8512 and 66,374 mg/kg, 12,950 and 14,050 mg/kg, 4979 and 9129 mg/kg, respectively. The presence of plants, electrode, and aeration improved sludge dewatering and decreased the organic matter and nutrient concentration of the residual
sludge. The heavy metals (Cd, Cr, Cu, Fe, Pb, Mn, Ni, and Zn) concentration of the residual sludge fulfilled the guidelines for agricultural reuse in Bangladesh. Chemical oxygen demand (COD), ammoniacal nitrogen (NH4-N), total nitrogen (TN), total phosphorus (TP), and coliform removal percentages from the drained wastewater ranged between 91 and 93 %, 88 and 98 %, 90 and 99 %, 92 and 100 %, and 75 and 90 %, respectively. NH4-N removal from the drained wastewater depended upon aeration. The sludge treatment wetlands achieved metals removal percentages (from the drained wastewater) ranging between 90 and 99 %. Physicochemical and microbial routes in accumulated sludge, rhizosphere, and media contributed to pollutants removal. Input load and organic removal increment (from the drained wastewater) were positively correlated; nutrient removal showed a contradictory trend. The non-aerated and aerated microbial fuel cell planted wetlands produced maximum power densities ranging between 66 and 3417 mW/m3. Because of the shorter experimental duration, this
study revealed preliminary but new information on the macro and micro pollutants removal pathways in septage sludge wetlands (with and without electrode) that could be utilized to design pilot or full-scale systems.