A hybrid (cryptic growth & feasting/fasting) approach for biosolids reduction

混合体（隐秘生长

• 批准号: 359680-2008
• 负责人: Eskicioglu, Cigdem
• 金额: $ 1.31万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2008
• 资助国家: 加拿大
• 起止时间: 2008-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=403720
• 关键词: hybrid; cryptic; growth; feasting; fasting

In Canada approximately 388,700 tons of dry sewage sludge (biosolids) are produced yearly and existing waste water treatment plants (WWTPs) are expanding to serve the demand of growing cities, which will result in an increase of sludge production in the future. Furthermore, the quality of waste sludge is worsening as a result of the presence of anthropogenic micro-pollutants, such as heavy metals, personal care products, endocrine disrupters, polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs) or dioxins, limiting agricultural and land reuse. New and practical WWTP sludge reduction approaches would not only reduce the operational and capital costs associated with sludge management and disposal, but also result in production of less biosolids and deleterious environmental effects when sent to landfill or agricultural land. This program builds on my expertise within the sludge line of MW pretreatment for sludge reduction, but shifts the focus of attention to wastewater line processes that lower sludge yield during wastewater treatment (one step earlier) rather than post-treatment after generation. The aim of this work is to study a hybrid (sonication followed by oxic-settling-anaerobic system) sludge reduction process as a viable technology for improved biodegradation and reduced sludge yield. The proposed research can be directly applied at the WWTP rather than in off-site post-treatments. The prior enhances biodegradation of sludge in aerobic/anaerobic bioreactors as a part of the carbon-oxygen cycle and leads to cost reductions in anaerobic biosolids digestion, dewatering, drying and transportation. Other benefits of this research will be improved sludge dewaterability and less biosolids returned to the environment as well as reduction of contaminants transferred to food crops grown on land and leaked into groundwater. If this research is successful, expansion of the sludge line treatment facilities (i.e., anaerobic digestion) could be delayed and Canada would be at the forefront of innovative wastewater line sludge minimization technology.

在加拿大，每年大约产生38.87万吨干污水污泥(生物固体)，现有的废水处理厂(WWTP)正在扩建，以满足不断增长的城市的需求，这将导致未来污泥产量的增加。此外，由于重金属、个人护理产品、内分泌干扰物、多氯联苯、多环芳烃或二恶英等人为微污染物的存在，废弃污泥的质量正在恶化，限制了农业和土地的再利用。新的和实用的污水处理厂污泥减量方法不仅可以减少与污泥管理和处置相关的运营和资本成本，还可以减少生物固体的产生，并在运往垃圾填埋场或农田时对环境造成有害影响。该项目以我在污泥处理领域的专业知识为基础，将注意力转移到废水处理过程中(提前一步)降低污泥产量的废水处理过程，而不是发电后的后处理过程。本工作的目的是研究超声-好氧-沉淀-厌氧复合污泥减量工艺作为一种提高生物降解率和降低污泥产量的可行技术。建议的研究可直接应用于污水处理厂，而不是用于场外后处理。PIRE强化了好氧/厌氧生物反应器中污泥的生物降解，作为碳氧循环的一部分，并降低了厌氧生物固体消化、脱水、干燥和运输的成本。这项研究的其他好处将是改善污泥脱水能力，减少生物固体返回环境，以及减少转移到陆地上种植的粮食作物和渗入地下水的污染物。如果这项研究成功，污泥管线处理设施(即厌氧消化)的扩张可能会被推迟，加拿大将走在创新废水管线污泥最小化技术的前沿。