This chapter explores the design, fabrication, and performance evaluation of a novel ultrafiltration ceramic membrane developed from red clay and nano-activated carbon, offering a cost-effective and sustainable solution for the treatment of oil-contaminated industrial wastewater. The growing discharge of oily wastewater, particularly from petrochemical and manufacturing industries, poses serious environmental threats and challenges for conventional wastewater treatment technologies. Traditional separation methods—including gravity separation, flotation, and chemical treatment—are often constrained by high energy demands, low separation efficiency, secondary pollution, and poor long-term reliability. As environmental regulations become increasingly stringent and water reuse is prioritized worldwide, the need for durable, energy-efficient, and scalable treatment technologies has become urgent.
Ceramic membranes have garnered significant interest for their
superior chemical stability, thermal resistance, mechanical strength, and
potential for prolonged operation under harsh conditions. However, their high
production cost—mainly due to the use of expensive raw materials and
energy-intensive sintering processes—has limited widespread commercial
deployment. To address this, the present study introduces an innovative
membrane formulation using low-cost red clay as the base material, enhanced
with nano-activated carbon to optimize pore formation and improve performance.
Additionally, calcium fluoride (CaF₂) was employed as a sintering aid to lower
fabrication temperatures, reducing overall energy consumption without
compromising membrane quality.
The fabricated membrane was thoroughly characterized to assess its
suitability for ultrafiltration applications. It exhibited an average pore size
of 95.46 nm, a contact angle of 67.3°, and enhanced mechanical
strength—confirming its hydrophilic nature and structural integrity. The
membrane's surface morphology, porosity, and surface charge were tailored to
improve water permeability and fouling resistance. A series of performance
tests were conducted using a cross-flow filtration setup with synthetic
oil-water emulsions to simulate industrial wastewater conditions.
The membrane demonstrated outstanding separation performance. As
transmembrane pressure increased from 3 to 6 bar, the permeate flux rose from
191.38 to 284.99 L/m²·h. Despite a slight flux decline from 490.28 to 367.32
L/m²·h due to oil deposition, the membrane consistently maintained a high oil
rejection rate of up to 99.96% at 5 bar and 80 NTU turbidity. Furthermore, its
negatively charged surface promoted efficient backwashing, allowing for
effective fouling mitigation and membrane reuse. These characteristics
highlight the membrane’s potential for long-term operation with minimal
maintenance.
Beyond experimental outcomes, this chapter provides a
comprehensive discussion of recent advances in oil-water separation
technologies, with a focus on ceramic membrane innovation and material
sustainability. It positions the red clay-based membrane as a viable
alternative for industrial wastewater treatment, particularly in
resource-constrained settings where cost and energy savings are critical. By
integrating material science, environmental engineering, and practical application,
the study contributes to the broader goal of developing green technologies for
global water security.
This work serves as a valuable reference for researchers,
engineers, and students in the fields of membrane science, environmental
technology, and wastewater management. The approach presented herein not only
advances the understanding of low-cost membrane fabrication but also
demonstrates the feasibility of scaling such solutions for real-world
applications in industrial water reuse and environmental protection.
Author (s) Details
Saad A. Aljlil
Water Management & Treatment Institute, King Abdulaziz City for Science
and Technology (KACST), Riyadh 11442, Saudi Arabia.
Please see the book here:- https://doi.org/10.9734/bpi/cmsrf/v3/5257
