Mine Water Treatment
10:10am - 10:35am
Steel Slag-Limestone Reactor with Resistance to Fe: Laboratory and Pilot Scale Evaluations of Mn Treatment Efficiency
1Sangji University, Republic of Korea; 2Korea Mine Reclamation Corporation (MIRECO), Republic of Korea; 3Department of Earth and Environmental Sciences, Korea University, Republic of Korea; 4Department of Earth Resources and Environmental Engineering, Hanyang University, Republic of Korea
Mixed substrate of steel slag and limestone were applied in reactors to evaluate resistibility to Fe. Steel slag mixed with limestone could decrease Mn from 32–46 mg L-1 to <3 mg L-1 with addition of 4.5–24.4 mg L-1 of Fe in the bench-scale experiment. In the pilot-scale experiments in five mines in South Korea, 95–99% of Mn was removed during the maximum test period of 4 years. Precipitation as Fe and Mn carbonates may have contributed to the Mn removal and resistibility to Fe.
10:35am - 11:00am
Offscreen-Break Due to No-show or Last Minute Cancellation
International Mine Water Association
11:00am - 11:25am
Magnetic Coagulation Technology For Coal Gasification Wastewater Treatment
1School of Ecology and Environment, Zhengzhou University 450001, Henan, China; 2Zhengzhou University Design and Research Institute Co.Ltd., China
Coal gasification wastewater is refractory for its high colority, complex water quality components, heavy toxicity and poor biochemical purification ability. This study focused on the wastewater treatment of coal gasification in a coal chemical enterprise by magnetic coagulation technology. Under the optimum condition, the removal rate of COD, turbidity and solube SiO2 were 27.6%, 97.0% and 68.4%, respectively. And the average recovery of magnetic powder was up to 97.38%. This paper provides technical guidance for the engineering application of the magnetic coagulation in coal gasification wastewater.
11:25am - 11:50am
Final Treatment Trials On Cwm Rheidol - Ystumtuen Mines Discharges, Wales, Using Sono-electrochemistry (Electrolysis With Assisted Power Ultrasound)
1Natural Resources Wales, United Kingdom; 2Power & Water
Results of the successful 2019 Sono-electrochemistry Soneco© final pilot trials using a magnesium electrode are presented. The preferred pH range was 8.8 to 9.0 removing 90.0%, 95.7% and 95.1% total lead, zinc and cadmium.
Full-scale treatment plant would utilise 3.1 kW/m3/h, a clarification area of 57m2 (enabling the lamella to fit in the existing filter beds) generating a sludge volume of 4.8m3/day at 2% w/w (further dewaterable by press). CapEx for a comparable high-density sludge process has an appealing ratio of 1:3. Reducing electrode costs will make OpEx more competitive whilst planned process enhancements will lower CapEx and OpEx further.
11:50am - 12:15pm
Scale-up of Electrochemical Units for Mining Waters Treatment
LUT University, Finland
Mining industry is getting more attracted to developing water treatment technologies. The ease with which technology is brought from lab to industrial scale, along with minimizing the time consumption and costs, is influenced by several factors. Some of these depend on the reactor, removal mechanisms, volumes and operating conditions. While others are affected by external factors such as the maximum size of the equipment, treatment costs of established or alternative technologies. Scale-up is mainly employed to see if the technology meets the market requirements and expectations. This study focuses on transferring an electrocoagulation process from lab scale to pilot plant.