Remediation of polluted sediment assisted by tidal energy

潮汐能辅助污染沉积物修复

• 批准号: EP/D079055/1
• 负责人: David Werner
• 金额: $ 26.1万
• 依托单位: Newcastle University
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2006
• 资助国家: 英国
• 起止时间: 2006 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FD079055%2F1
• 关键词: Remediation; polluted; sediment; assisted; tidal

Many estuaries and river sediments in the UK and worldwide are impacted by organic pollutants at levels which are harmful to the ecosystem. For instance, the Tyne Estuary in the North of England is heavily polluted with petroleum hydrocarbons, including polycyclic aromatic hydrocarbons (PAHs), and recent studies demonstrated ecotoxicological effects in fish, e.g. flounder and eels. The EU water framework directive lists PAHs as priority substances in the field of water policy because of their carcinogenic potency.Natural processes such as the microbial break-down and the strong adsorption of pollutants like PAHs to certain sediment constituents (e.g. carbonaceous particles) can reduce the ecotoxicity of polluted sediment significantly. However, the limited availability of nutrients and oxygen, the formation of ecotoxic products from microbial break-down, a limited number of strong sorption sites in natural sediment, and slow mass transfer of pollutants from weak sorbents to microorganisms or strong sorbents may impede a natural recovery. It is thus proposed to devise a low-cost engineering system in which natural processes leading to a sediment recovery can be enhanced in a controlled setting.Tidal energy will be exploited to agitate the sediment and replenish it with nutrients and oxygen. This will accelerate the microbial break-down of the degradable portion of the pollution. The labile, but non-degradable portion of the pollution and eventual break-down products will be removed from the sediment by infiltrating the effluent from the system across a bed with an adsorbent. The residual pollution in the sediment will be sequestered by adding a dose of a strong, preferably natural sorbent (e.g. coal) to the sediment at the end of the treatment. Presumably this will result in a substantially reduced sediment ecotoxicity and longterm stabilization of the residual pollution.By exploiting tidal energy and natural processes the costs for this treatment can be kept low. The scheme could be implemented in situ to avoid the removal of sediment or ex situ, possibly within existing structures such as abandoned dry docks, to treat sediment from routine dredging operations. The in situ emplacement or ocean disposal of treated, stabilized sediment would implicate less risks than disposal of the untreated sediment, or the treated, stabilized sediment may become an acceptable material for use on shore, e.g. as a filling material.

英国和全世界的许多河口和河流沉积物都受到对生态系统有害的水平的有机污染物的影响。例如，英格兰北部的泰恩河口受到石油碳氢化合物的严重污染，包括多环芳烃（PAHS），最近的研究表明，鱼类对鱼类的生态毒理作用，例如。比目鱼和鳗鱼。欧盟水框架指令将PAHs列为水政策领域的优先物质，因为其致癌效力。自然的过程，例如微生物分解和PAHS（例如PAH）对某些沉积物成分（例如碳质颗粒）的强烈吸附（例如，碳质颗粒）可以显着降低污染沉积的生态毒性。然而，营养和氧气的利用率有限，微生物分解中生态毒性产物的形成，天然沉积物中有限数量的强吸附位点，以及从弱吸附剂到微生物或强吸剂的污染物缓慢的质量转移可能会阻碍自然恢复。因此，建议设计一种低成本的工程系统，在该系统中，可以在受控的环境中增强导致沉积物恢复的自然过程。潮汐能将被利用以搅拌沉积物并用养分和氧气补充。这将加速污染的可降解部分的微生物分解。不稳定但不可降解的部分污染和最终破裂产品将通过渗入带有吸附剂的床上的系统中的废水来从沉积物中清除。沉积物中的残留污染将通过在治疗结束时向沉积物中添加一定剂量的强，最好的天然吸附剂（例如煤）来隔离。据推测，这将导致沉积物生态毒性大大降低，并长期稳定残留污染。通过利用潮汐能和自然过程，这种治疗的成本可以保持较低。该计划可以原位实施，以避免去除沉积物或现场，可能在现有的结构（例如废弃的干码头）内，以从常规的疏and行动中处理沉积物。与未经处理的沉积物的处置相比，经过处理的稳定沉积物的原位进一步或海洋处置的风险可能更少，或者处理经过处理的稳定沉积物可能成为可在岸上使用的可接受的材料，例如作为填充材料。

项目成果

Characterising a possible natural cap material at a hydrocarbon polluted site in the river Tyne, England

描述英格兰泰恩河碳氢化合物污染地点可能的天然盖材料的特征

• 发表时间: 2008
• 作者: D Werner

Effect of activated carbon amendment on bacterial community structure and functions in a PAH impacted urban soil.

• DOI: 10.1021/es2043905
• 发表时间: 2012-05-01
• 期刊: ENVIRONMENTAL SCIENCE & TECHNOLOGY
• 影响因子: 11.4
• 作者: Meynet, Paola;Hale, Sarah E.;Davenport, Russell J.;Cornelissen, Gerard;Breedveld, Gijs D.;Werner, David
• 通讯作者: Werner, David

Can quantification of dioxygenase genes monitor polycyclic aromatic hydrocarbon degradation?

双加氧酶基因的定量可以监测多环芳烃的降解吗？

• 发表时间: 2008
• 作者: P Meynet