In case you have forgotten, I’d like to remind you that we passed World Water Day in 22 March. This year’s theme is “Water Scarcity”. In my previous post, indeed I put several rows talking about water scarcity and few pictures of it as an example, when it displayed several kids need water badly in the middle of dessert.
Environmental Magazine
I found this magazine recently, it was on magazines.com website. This is quite interesting since it is not easy to find magazines dedicated fully to environmental condition. Here what they say: About E: The Environmental Magazine: E covers everything environmental “from recycling to rainforests,” including climate change, the state of oceans and rivers, and wildlife … Read more
Sewer, sewerage… in history
On the early application of human waste disposal, nuisance and health problem always be primary effect caused by such activity. Just imagine, often the method of disposal consisted of nothing more than flinging out the content of the pots out the window!
Calculating Societal Cost for Gas your vehicle emit
I found this very interesting to find out, how to quantify potential loss, societal cost due to gas emission from our transportation. Let’s do the math now!
Planning ahead: theses
Right, I am trying to list here what I am planning to do within short time:
At the moment, I am cleaning my all membranes after TiO2-UV batch: 1 kD, 15 and 50 kD, two pieces for each.
TiO2 coating procedures
There are various methods available to coat TiO2 onto the surface of the membrane. I will explain briefly some of them, and the method I used.
Ion assisted deposition
This method was used for coating on super-hydrophobic porous teflon membrane. The author stated that the coating of TiO2 by the chemical wet process such as a sol-gel method is very difficult. The method involved acceleration voltage, temperature, and oxygen. Heated at 523 K.
Water treatment: impure water, back to history
Impure water is a water that contaminated by unwanted elements. It can be particles, colloids, debris. Of course, for both drinking water or clean water for household activities, these impurities are not wanted. Thus, it is important for us to treat source water to remove these elements. That is why we need water treatment.
TiO2-UV batch for UF fractionation
The result of my experiment employing TiO2-UV was not satisfying. In terms of flux, TiO2-UV membrane showed severe decline after 30, 60, and around 90 minutes. Not only that, the rejection of membrane coated by TiO2 under UV exposure was lower than naked membrane. This probably due to smaller molecule as a result of the breaking caused by photocatalysis process. After certain minutes, it is possible that TiO2-UV react with the HA, braking bonds within HA molecules, the molecules become smaller, thus it will penetrate the pore of TiO2-UV, so the DOC will be much higher than naked membrane. How about flux? my logic says if the rejection is lower, so the flux should be better as flux and rejection usually work on the opposite way. If the flux better, usually rejection worse, vice versa.
Environmental News: what’s today
I just read my local newspaper and there were two news catching my eyes. The first one was talking about water scarce in Tiongkok, or some of you may say China. While we sometimes use water excessively and exploit water too much, there are our brothers out there who need water badly. Water scarce as reported happens in Hainan Province, South of Tiongkok due to hight dryness. More than 120 thousands people experienced clean water crisis and paddy field dry due to lack of water.
Water supply in Surabaya
Drinking water scarce, it was the headline of popular newspaper in my city. Citizens were yelling to ask local authority to safe drinking water. The problem is, water is renewable resource, which will never be empty, always be there for water supply. So, why do these people feel that they do not get appropriate drinking that they deserve to get?