Wu Jinlu, Yang Y S, Lin Jinhua
Cardiff University, School of Earth, Ocean & Planetary Sciences, UK.
J Hazard Mater. 2005 Dec 9;127(1-3):196-203. doi: 10.1016/j.jhazmat.2005.07.016. Epub 2005 Aug 24.
Advanced technology for more efficient and effective wastewater treatment is always timely needed. The feasibility of using raw and modified diatomite for advanced treatment of secondary sewage effluents (SSE) was investigated in this study. Raw diatomite at a dosing rate of 300 mg/l showed a similar potential as activated carbon for removing most organic pollutants and toxic metals from SSE. Its performance was found poor in removal of arsenic and crop nutrient constituents (e.g. ammoniacal nitrogen and phosphate) and remained unsatisfactory even when the dosing rate increased up to 500 mg/l. Where modified diatomite was in lieu of raw diatomite, the removal efficiency for all target constituents was improved by 20-50%. At the dosing rate of 150 mg/l, modified diatomite enabled the post-treated effluents to satisfy the discharge consents, with the levels of all target constituents below the regulatory limits. Modified diatomite has advantages over raw diatomite in improving removal efficiency and reducing the dosing rate required for satisfactory treatment of SSE. It is concluded that modified diatomite is much more effective and efficient than raw diatomite, as an alternative to activated carbon, for economic treatment of SSE.
始终迫切需要先进技术来更高效地处理废水。本研究考察了使用原生硅藻土和改性硅藻土深度处理二级污水（SSE）的可行性。投加量为300mg/l的原生硅藻土在去除SSE中大多数有机污染物和有毒金属方面表现出与活性炭类似的潜力。但发现其在去除砷和作物营养成分（如氨氮和磷酸盐）方面效果不佳，即使投加量增加到500mg/l，效果仍不令人满意。当使用改性硅藻土代替原生硅藻土时，所有目标成分的去除效率提高了20%至50%。在投加量为150mg/l时，改性硅藻土使处理后的出水符合排放许可要求，所有目标成分的含量均低于监管限值。改性硅藻土在提高去除效率和降低满足SSE满意处理所需的投加量方面优于原生硅藻土。得出的结论是，作为活性炭的替代品，改性硅藻土在经济处理SSE方面比原生硅藻土更有效且高效。
