Solid-liquid separation: an emerging issue in heavy metal wastewater treatment

Area of Science:

• Environmental Engineering
• Chemical Engineering
• Water Treatment Technologies

Background:

• Solid-liquid separation (SLS) is vital in chemical industries.
• Low efficiency of SLS is a major challenge in heavy metal (HM) wastewater treatment, impacting effluent quality and process economics.
• Understanding solids in HM wastewater and current SLS methods (sedimentation, flotation, centrifugation) is essential.

Purpose of the Study:

• To review current SLS operations in HM wastewater treatment.
• To explore technologies for improving SLS efficiency.
• To identify promising strategies for enhanced heavy metal removal.

Main Methods:

• Review of existing literature on SLS in HM wastewater treatment.
• Analysis of various improvement technologies: coagulation, flocculation, ballasted method, seeding method, granular sludge strategy, and external field enhancement.
• Comparative assessment of SLS efficiency based on settling velocity and separation time.

Main Results:

• Abiological granular sludge strategy and magnetic field enhancement demonstrate superior SLS efficiency compared to other methods.
• These advanced methods offer faster settling velocities and shorter separation times.
• Current SLS methods face challenges in achieving optimal heavy metal removal and water clarity.

Conclusions:

• Abiological granular sludge strategy and magnetic field enhancement are promising for improving SLS in HM wastewater treatment.
• Further research is necessary to address scalability, economic viability, and reliability of these advanced methods.
• Optimized SLS is key to effective heavy metal remediation and sustainable water management.