Environmental Engineering Diary

Environmental impact statement and Environmental assessment

The general principle of environmental impact assessment has been explained in previous post. Three outcomes resulted from judging the proposed project are FONSI, EA and EIA. EA and EIS document generally consist on three parts, introduction, description of proposed project and alternatives and description of the environment affected by the proposed actions.

The introduction part of the document will state overview of the project, the purpose, alternative actions, summary of important environmental aspects and the methods of assessment being used. The description of proposed actions and alternative will describe the actions, lists of stage conducted for the project. In this part, alternatives are also mentioned, including a “no-action” alternatives as well. Statement also include the projected actions if the project is not done. Read the rest of this entry »

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What is the effect of MWCO membrane towards fouling?

Right, this post is actually being made because of my other post about Between TiO2 and UV254 to contribute fouling and performance. If you look at the paragraph 2, it tells everything about the problem of the permeability. Im gonna try again to define the problem.

Well, permeability as I already mention it in another post about will TiO₂ coating cause denser pore or smaller MWCO? is representing the MWCO of membrane, because permeability is an indicator of the quantity of pure water passing through the membrane. Several conclusions about permeability based on my experiments are located below. Read the rest of this entry »

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Between TiO2 and UV254

Between TiO₂ and UV₂₅₄ which one contributes more towards fouling? This question that I would like to discuss in this post. The answer at this time will solely based on my own experience. From what I have before about permeability, it is important factor to be considered. Because as I said already in that post, permeability means the size, the MWCO of the membrane. Higher permeability tends to give higher flux in the short term, depending on the MWCO of the membrane. Higher permeability membranes will give more severe decline of flux, means more fouling. Lower permeability membranes in initial operation produce lower flux, but at least the fouling is not as severe as higher permeability membranes. Another advantage for lower permeability membranes is higher rejection, stable as a function of operation time. Read the rest of this entry »

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Titanium dioxide: paper review

So I read this paper, and found something valuable there. Photocatalysis is often used for treating water organic pollutants. Titanium dioxide is usually used because it is stable and inexpensive. This paper stated that one author observed that increasing the initial pH of phenol, increases the decomposition rate, reaching max value at 3.3, then decreasing upon further increase in pH. Read the rest of this entry »

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UV/Vis Spectrometer Cintra

Im fixing my theses and putting the information about UV/Vis spectrometer I used for my experiment. I was using GBC Cintra 20 UV/Vis spectrometer. When I try to find out about the details through google, hardly to get relevant information. But if you are interested to find out about Cintra family UV/Vis spectrometer, I suggest you visit http://www.gbcscientific.com/

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