Tech Offers

Chemical-free Wastewater Treatment using HAOPs

Membrane-based separation technology has been widely used for various water treatments. However, because of the nature of filtration, contaminants that are removed by the membrane tend to deposit on the membrane surface, resulting in pore blocking and permeate flux reduction. This phenomenon, referred to as membrane fouling, occurs in almost all membrane processes. Various strategies have been developed to tackle the issue, including pretreatment of raw source waters by coagulation. Compared with conventional adsorbents and coagulants, heated aluminum oxide particles (HAOPs) have been found to be more effective in organic matter removal for various source waters including surface water, seawater and effluents from membrane bioreactor (MBR). As a result, raw water pretreatment using HAOPs can mitigate organic fouling in subsequent membrane processes significantly. Furthermore, the sludge generated during the pre-treatment using HAOPs is far easier to dewater than that generated using conventional coagulants, saving the costs both in the dewatering step and the subsequent sludge transport and disposal steps. Finally, HAOPs-based treatment is much more robust and reliable than the conventional coagulation-based processes under conditions of fluctuating influent composition.The technology owner is interested in seeking technology licensing collaborator or manufacturing partner. 

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Non-iterative Simultaneous Localization and Mapping (NI-SLAM)

Non-iterative Simultaneous Localization and Mapping (NI-SLAM) is a patented method for position tracking and environment dense reconstruction, using affordable sensors such as depth camera and inertial sensors. Compared to traditional SLAM methods, the superior real-time processing speed of NI-SLAM is achieved by an innovative method of data registration that performs point-cloud matching in Fourier Domain.

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A Novel Graph Optimization Approach to Localization (GOAL) for Unmanned Systems

GOAL is concerned with 2-D plane and 3-D space localization technology for robots. The methodology leverages on ultra-wideband (UWB) aided localization system and can be extended to application with other sensors such as inertial measurement unit (IMU), Wi-Fi, Optical Flow and Cameras.Unlike existing Filter-based localization algorithms which have unacceptable estimation error in altitude, this technology provides high accuracy in the estimation in altitude without adding other sensors for altitude estimation, which saves cost of localization system. Also, this technology has the function for rejecting Non-line-of-sight (NLOS) measurements, which enables this technology to NLOS environment. The design of flexible moving window in this technology decreases the computational resources and increases the robustness to short duration lost in signal, which enables this technology to be applied to robots with ultra-low power processor.

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High Performance Membranes for Energy Harvesting by Pressure Retarded Osmosis

Pressure retarded osmosis (PRO) is a process where water flows naturally from a low salinity stream (feed water) at an ambient pressure across a semi-permeable membrane to a pressurized high salinity stream (draw solution). This process is driven by the osmotic pressure difference across the membrane. The increased volume of pressurized solution can be utilized to drive a turbine for power generation. As such, PRO process is considered as a promising approach to harvest salinity gradient energy.In this invention, PRO composite hollow fiber membranes with an ultra-thin RO-like skin layer on the inner surface of a UF hollow fiber substrate have been successfully developed using a two-step preparation. The advantage of this approach is that it allows the use of different materials and different methods for the preparation of the skin and the hollow fiber substrate separately. Pilot-scale PRO modules (2-inch) have been fabricated and operated in a long run of 6 months for validation test.The technology owner is interested in seeking technology licensing collaborator or manufacturing partner. 

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High Flux Aquaporin Biomimetic Membranes for Desalination

Reverse osmosis (RO) membranes are widely applied for wastewater reclamation and seawater desalination field. However, the energy consumption of this technology is still one of the main concerns. An ultra-permeable membrane, aquaporin biomimetic membrane (ABM) has attracted considerable interest over the past decade.The ABM is fabricated by incorporating aquaporins (AQPs) into RO membranes. AQPs are biological proteins that form selective natural water channels. They have received increasing attention because of their high water permeability (each water channel can pass ~10^9 water molecules per second) and superior selectivity, i.e. the water channel only allows water passage while fully rejecting solutes. Compared to the conventional RO membranes, the ABM exhibits improved water permeability and salt rejection, and has great potential to reduce energy consumption for wastewater reclamation and brackish water/seawater desalination.The technology owner is interested in seeking technology licensing collaborator or manufacturing partner. 

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Hybrid NF-MBR & RO System for High Water Recovery

Reclaimed water is a critical source of water in Singapore and globally. Common practical limit of existing technology based on microfiltration/ultrafiltration-membrane bioreactor (MF/UF-MBR) + reverse osmosis (RO) for water reclamation is 75-85% recovery due to RO membrane fouling. A hybrid system consists of a high retention nanofiltration-membrane bioreactor (NF-MBR) + RO is developed to achieve more than 90% of water recovery at 10 L/m2.h flux rate. NF-MBR produces superior quality effluent because NF membrane can retain low molecular weight organics and scale forming divalent ions. Thus, membrane fouling in downstream RO process can be alleviated significantly, which allows higher recovery. In addition, the inherent advantages of lower fouling potential of RO feed water include: (i) reduced chemical usage and energy consumption associated with RO membrane fouling, (ii) extend the RO membrane lifespan, and (iii) reduced water production cost.The technology owner is interested in seeking technology licensing collaborator or manufacturing partner. 

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