A heightened awareness of the condition of its rivers had led local government units and concerned agencies in the province of Bulacan to tap BIOTECH of UP Los Baños for help in setting up bioremediation solutions, which are less costly and more environment-friendly than conventional chemical treatments.
Dr. Lorele C. Trinidad, researcher at BIOTECH, and leader of the team that is developing the bioremediation system, reported that the prototype they have developed can remove and at the same time recover heavy metals from water discharged during processing of gold and leather tanning.
Gold jewelry-making is a popular household-based livelihood in the province of Bulacan, but most jewelry-makers here use crude equipment and inefficient processing techniques.
Silver, a valuable metal, can be recovered from the chemical solutions used in gold-smelting. The recovery process, however, results in copper-laden wastewater that is usually dumped into Bulacan’s river system. When Dr. Trinidad's team examined industrial wastewater from various sites of the river system, samples were found to contain 5,000-10,000 ppm of copper. The limit allowed by the DENR is only 1.3 ppm.
Also a common means of livelihood in Bulacan, leather tanning operations use the chemical called Chromium III in the treatment of raw animal hide. According to Dr. Trinidad, the process uses up so much Chromium III that as much as half of the applied chemical ultimately ends up in the river.
With funding assistance from the Department of Science and Technology (DOST) and the Philippine Council for Industry and Energy Research and Development (DOST-PCIERD), Dr. Trinidad’s team identified 12 isolates of bacteria that have a high capability to reduce sulfates and produce hydrogen sulfide gas. These bacteria were collected from the provinces of Marinduque and Bulacan and used to develop the bioremediation system.
The bioremediation system, built by the DOST’s Industrial Technology Development Institute for Dr. Trinidad’s project, uses hydrogen sulfide gas produced by the bacteria to precipitate and recover copper and chromium from wastewater.
Results of optimization studies done on the prototype have shown great potential for upscaling to a working unit for installation in actual operation sites.
Dr. Trinidad and her team of researchers are now designing a bench-scale metal recovery system, to cost around P300,000, for completion by the end of 2009.
Single-stranded DNA and RNA origami go live
15.12.2017 | Wyss Institute for Biologically Inspired Engineering at Harvard
New antbird species discovered in Peru by LSU ornithologists
15.12.2017 | Louisiana State University
DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.
Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
15.12.2017 | Power and Electrical Engineering
15.12.2017 | Materials Sciences
15.12.2017 | Life Sciences