Anaerobic treatment is the core technology for resource and energy recovery from source-separated domestic bio-wastes. The higher efficiency of an improved upflow solid reactor（IUSR） designed in this study was demon...Anaerobic treatment is the core technology for resource and energy recovery from source-separated domestic bio-wastes. The higher efficiency of an improved upflow solid reactor（IUSR） designed in this study was demonstrated in the treatment of concentrated black water and kitchen waste. The highest methane production of 48 L/person/day was achieved at the hydraulic retention time（HRT） of 7 days, while the other measures of performance at the HRT of 8.3 days were better than at the HRT of 7 or 10 days, achieving a methane production of 43 L/person/day, removal of total chemical oxygen demand（TCOD）of 89%, removal of soluble chemical oxygen demand（SCOD） of 92%, and conversion of chemical oxygen demand（COD） to methane of 71%. It is not recommended to decrease HRT lower than 7 days due to the instability of the initial period. The concentrations of volatile fatty acids（VFAs） in the IUSR were less than 10 mg/L, indicating that the anaerobic process was stable. Sludge bed development showed that sludge bed with high microbial activity was formed in the bottom and that the precipitation zone of effluents formed should preferably occupy 30% of the height of the IUSR. The effluents of the IUSR could be used for irrigation in agriculture in combination with a settling tank accompanied by disinfection to remove solids and pathogens.展开更多
This research demonstrated the feasibility of converting source-separated human urine into a solid fertilizer by means of continuous absorption and solar thermal evaporation using dried water hyacinth as adsorbent. In...This research demonstrated the feasibility of converting source-separated human urine into a solid fertilizer by means of continuous absorption and solar thermal evaporation using dried water hyacinth as adsorbent. In a preliminary experiment, the dried petioles of water hyacinth (DWH) absorbed urine in a mean rate of 18.78 ml·g-1 within 7 d, retrieving about 3.46% urine dissolved solids (UDS). In an advanced experiment, the DWH’s capacity of urine absorption declined from an initial 2.73 L·kg-1·d-1 to 0.68 L·kg-1·d-1, with a requirement of material change in about 25 effective days and an average ratio of 25 (L) to 1 (kg). Phosphorus (P2O5) concentration in the adsorbent increased from 0.46% (material baseline) to 3.14% (end product), suggesting a satisfactory recovery of the element. In field application, the urine was discharged, not in wet weather, onto the DWH via a tube connected to a waterless urinal. There are several ways to use the UDS-DWH as P(K)-rich fertilizer, e.g., making soluble fertilizer for foliage spraying to encourage prolific flowering and fruiting. Apparently, utilization of water hyacinth waste to recover dissolved plant nutrient elements from source-separated urine will benefit the environment in a wide range of perspectives. The herein innovative use of water hyacinth is also expected to be useful in the recycling of certain dissolved hazardous materials.展开更多
尿液因其含有丰富的氮、磷、有机物等营养物质,被称为“废水中的黄金”,其如何处理废弃资源并实现高效资源化利用已成为环境工程领域科研人员关注的焦点。基于Web of Science数据库对“尿液废水”、“源分离尿液”等关键词进行检索分析...尿液因其含有丰富的氮、磷、有机物等营养物质,被称为“废水中的黄金”,其如何处理废弃资源并实现高效资源化利用已成为环境工程领域科研人员关注的焦点。基于Web of Science数据库对“尿液废水”、“源分离尿液”等关键词进行检索分析、归纳总结,将目前处理源分离尿液废水的研究分为氮去除(回收)、磷回收、产电及其他等4个方面。进一步对其处理技术分析发现:1)氮回收主要通过吹脱、离子交换吸附、电化学等技术实现;2)磷回收则多以化学沉淀技术为主;3)基于生物电化学技术,尿液中有机化学能可回收电能,为其资源化利用提供新的途径。然而,由于尿液废水成分复杂、氮磷等污染物浓度高,现有单一技术难以实现其中多种物质或能量形式的同时处理与利用,且回收效果及成本仍不能满足实际应用要求,高效稳定的一体化源分离尿液废水处理技术仍需进一步深入研究。通过系统总结处理现状及研究进展,有利于加深对源分离尿液废水资源化处理技术应用的认识,具有一定的指导意义。展开更多
基金supported by the Major Science and Technology Program for Water Pollution Control and Treatment of China (No. 2011ZX07301-003)the National Key Research and Development Plan (No. 2016YFC0400806)
文摘Anaerobic treatment is the core technology for resource and energy recovery from source-separated domestic bio-wastes. The higher efficiency of an improved upflow solid reactor（IUSR） designed in this study was demonstrated in the treatment of concentrated black water and kitchen waste. The highest methane production of 48 L/person/day was achieved at the hydraulic retention time（HRT） of 7 days, while the other measures of performance at the HRT of 8.3 days were better than at the HRT of 7 or 10 days, achieving a methane production of 43 L/person/day, removal of total chemical oxygen demand（TCOD）of 89%, removal of soluble chemical oxygen demand（SCOD） of 92%, and conversion of chemical oxygen demand（COD） to methane of 71%. It is not recommended to decrease HRT lower than 7 days due to the instability of the initial period. The concentrations of volatile fatty acids（VFAs） in the IUSR were less than 10 mg/L, indicating that the anaerobic process was stable. Sludge bed development showed that sludge bed with high microbial activity was formed in the bottom and that the precipitation zone of effluents formed should preferably occupy 30% of the height of the IUSR. The effluents of the IUSR could be used for irrigation in agriculture in combination with a settling tank accompanied by disinfection to remove solids and pathogens.
文摘This research demonstrated the feasibility of converting source-separated human urine into a solid fertilizer by means of continuous absorption and solar thermal evaporation using dried water hyacinth as adsorbent. In a preliminary experiment, the dried petioles of water hyacinth (DWH) absorbed urine in a mean rate of 18.78 ml·g-1 within 7 d, retrieving about 3.46% urine dissolved solids (UDS). In an advanced experiment, the DWH’s capacity of urine absorption declined from an initial 2.73 L·kg-1·d-1 to 0.68 L·kg-1·d-1, with a requirement of material change in about 25 effective days and an average ratio of 25 (L) to 1 (kg). Phosphorus (P2O5) concentration in the adsorbent increased from 0.46% (material baseline) to 3.14% (end product), suggesting a satisfactory recovery of the element. In field application, the urine was discharged, not in wet weather, onto the DWH via a tube connected to a waterless urinal. There are several ways to use the UDS-DWH as P(K)-rich fertilizer, e.g., making soluble fertilizer for foliage spraying to encourage prolific flowering and fruiting. Apparently, utilization of water hyacinth waste to recover dissolved plant nutrient elements from source-separated urine will benefit the environment in a wide range of perspectives. The herein innovative use of water hyacinth is also expected to be useful in the recycling of certain dissolved hazardous materials.
文摘尿液因其含有丰富的氮、磷、有机物等营养物质,被称为“废水中的黄金”,其如何处理废弃资源并实现高效资源化利用已成为环境工程领域科研人员关注的焦点。基于Web of Science数据库对“尿液废水”、“源分离尿液”等关键词进行检索分析、归纳总结,将目前处理源分离尿液废水的研究分为氮去除(回收)、磷回收、产电及其他等4个方面。进一步对其处理技术分析发现:1)氮回收主要通过吹脱、离子交换吸附、电化学等技术实现;2)磷回收则多以化学沉淀技术为主;3)基于生物电化学技术,尿液中有机化学能可回收电能,为其资源化利用提供新的途径。然而,由于尿液废水成分复杂、氮磷等污染物浓度高,现有单一技术难以实现其中多种物质或能量形式的同时处理与利用,且回收效果及成本仍不能满足实际应用要求,高效稳定的一体化源分离尿液废水处理技术仍需进一步深入研究。通过系统总结处理现状及研究进展,有利于加深对源分离尿液废水资源化处理技术应用的认识,具有一定的指导意义。
