The Case
The client runs one of the largest mining operations in Europe and in many processes uses direct seawater for cooling. During discharge, the waste streams contain heavy metals which have to be removed on a continuous feed flow basis of 480 m³/h - 2,116 GPM.
The goal was to quickly validate the membrane capabilities during an on-site pilot test. It was determined the SiC membranes could remove the heavy metals as required and would withstand the cleaning regime needed to maintain stable permeability with warm seawater up to 50°C / 122°F.
Beyond the supply of 3.000 m² / 32,292 ft² membranes for particle separation, LiqTech supplied the complete SiC filtration system including installation on-site. The installation involved filtration and dewatering skids, 10 large 40m³ / 1,412 ft³ precipitation / buffer tanks and chemical dosing for precipitation and cleaning.
Materials and Components
The membranes are made from silicon carbide material which proves to be extremely robust with high permeability and stable flux. Further the membranes are chemical inert and very temperature resistant.
Membrane multi-housings are made of glassfiber reinforced plastics (GRP) and single housings of polypropylene. Piping is made of polyethylene and all welded by our certified craftsmen on-site.
Pumps are high-efficient Grundfos in duplex steel grade with ABB motors.
All components and pipes are mounted on stainless steel SS316L frames and supports.
Modular Systems
The filtration systems are made in semi-dead end configuration for particle removal utializing our OD25mm CoMem UF SiC membrane in a 99X GRP multihousing in racks of 6 housings.
The cross flow dewatering system is based on OD146mm CoMem UF SiC membrane in a PP single housing in racks of 6 and multiple trains.
Cleaning Method
The system is built with Grundfos DDA and DMX dosing pumps for membrane cleaning. Further LiqTech supplied chemical storage tanks with thermal insulation and heating coils including CIP storage and waste handling tanks - all fabricated in-house and in PE material.
If need any more information or help regarding heavy metal removal, please do not hesitate to contact us
