Conference Agenda

Mine Water Treatment
Monday, 12/July/2021:
10:10am - 12:15pm

Session Chair: Devin Sapsford
Location: Meeting Room 2

10:10am - 10:35am

Steel Slag-Limestone Reactor with Resistance to Fe: Laboratory and Pilot Scale Evaluations of Mn Treatment Efficiency

Duk-Min Kim1,2, Youn-Soo Oh2,3, Hyun-Sung Park2, Dae-Gyu Im1, Woong-Lim Lim1, Hye-Rim Kwon1, Joon-Hak Lee2,4

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

IMWA 2021 Organizers

International Mine Water Association

11:00am - 11:25am

Magnetic Coagulation Technology For Coal Gasification Wastewater Treatment

Jianlei Gao1, Yan Liu1, Yixin Yan1, Wenhao Wang2

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)

Peter Clive Stanley1, Chris Bullen2

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

Maria Mamelkina, Ritva Tuunila, Antti Häkkinen

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.