1) Types of Problems in Science and Engineering are recommended.\n\n2) Provide reliable sources/references.\n\n2) If there are no problems at all with a Water Treatment Plant, please do state in what area should be this Plant to IMPROVE on. Be specific (Also in the category of Science and Engineering).\n\n4) Even if there are problems that are NOT related with Science and Engineering, do still proceed with your own type of answers.
122613
During the desigh phase of the project, the ability to anticapate future needs is the biggest problem. Adding to an existing plant at a later date can be done but at what cost? Many cities build a plant without having a plan for expansion. The balance between inbound flow, treatment capacity and storage must be dead on for the plant to be effecient. The newer plants are almost completly automated.
36309
Definitely "Why does water expand when it is frozen?" It sounds more scientific and general. You may also want to expermiment on different chemecals, and record their expansion rate.
130511
The best thing would be a bit of bleach.  Do the math - you should shoot for about 2 to 4 parts per million hypochlorite (since commercial preparations are usually 5% - which is 50,000 parts per million - YOU NEED TO DILUTE IT 25,000 FOLD BEFORE YOU DRINK IT - SEE MY NOTE AT THE BOTTOM).  You should also try to store the water in the dark, in an opaque container, or at least in a brown or green glas container since algae growth is photosynthetically driven (i.e. needs light)\n\nBE CAREFUL HANDLING BLEACH - AT HIGH CONCENTRATIONS IT IS TOXIC AND CORROSIVE.
533118
(getting out my lab report from last year) Ahem, An abstract tells about the purpose of the experiment and a shortened version of the procedure and results.\n\nFor example:\n\nThe purpose of this experiment was to find out which morning glory would grow best under the influence of different sodas (coca-cola, dr.pepper, orange soda, cream soda) in 30 days. I started out with 2 inch high morning glories.\n\nI gave each plant 25 milliliters of the specified soda each day. I measured the plant's growth in centimeters. This determined the growth rate of each plant.\n\nMy hypothesis was that cream soda would help the morning glories grow best.My data shows that my hypothesis should be rejected. Orange soda made the morning glories grow best.\n\nOrange Soda made the plant grow 12 centimeters, which was a larger amount than than the growth rate of the other sodas plants. I found that Cream Soda did the worst, only having a growth of 4 centimeters.\n------------------------------------------------------------------------------------\nThis is not real data, nor is the information even remotely correct.\nMind you, I got an A+ on my research report and I hope you do too. Remember, this is just an example of an abstract, and the data I put in IS NOT correct. Check with your teacher before you write your abstract.
311219
What environment are you in?\n\nWind or hydro might be better options depending on local conditions. also depending on local skills and suppliers. see appropriate technology site
509862
well photosynthesis is a good way to start. the water from the roots are pulled by cohesion and then it leaves from the stroma in the plant leaves.
172624
Try a mini ecosystem in a 2-liter coke bottle. Study it for a few months and see how it changes. Record what plants and animals you put in too.I suggest putting in some worms, moss, and an up-right plant
371360
Any good scientist knows that in order to find a solution to a problem you have to try different things.\nWhy don't you try your sugar cube idea and see what happens.  Document it.  If it doesn't work, try something else.  Keep trying different things until you find the conclusion that you're looking for.  Science can be fun!  Enjoy it.
499780
Find a question that relates to the local area you live in, something you may have noticed, or has controversy.  A saying I like is "One measurement is worth a thousand expert opinions", which is the essence of science.  So find something to measure.  When I was in school (a long time ago) people I knew wondered about whether the local creek was clean enough.  Kids played in the creek and some people fished in it, but I thought it shouldn't foam and have a not quite clear look.  So, I got some sterile petri dishes from the biology lab, got some q-tips, and talked the local hospital pathologist into helping me.  If you need help, ask, you might be surprised, it turned out he was curious too.  Anyway, I learned a bit about how to identify bacteria and yes, the creek was polluted-bad!  I made the front page of the local paper.  I'm not saying do this, but think of a local problem and measure it.  Hope this helps.
330471
Dear Editor,\n\nI am a student concerned about the recent water supply shortages caused by mismanagement by the water supply authorities.  The shortages have caused me no end of misery.  Not only am I not able to take a shower, or flush my toilet consistently, I am becoming dehydrated from lack of fresh water to drink.  As a result, I can't do my own homework and must instead ask strangers on the internet to do it for me.\n\nI would appreciate it if you could write an editorial on the subject to pressure the authorities to increase the water flow.\n\nSincerely,\n\nMy name, not somebody else that I copied from.
612265
It doesn't hurt to be inquisitive on Yahoo Answers and get sources of information for stuff you are doing for your engineering homework.  As long as you aren't posting questions directly from your homework and as long as you actually use this as simply a starting point for your research, keep up the good work.\n\nAs far as Electrical Engineering stuff.  I have found what I needed a few times from Google.com and Wikipedia.  However, that is a difficult course and I would recommend tutoring or study groups if you are struggeling.  \n\nGood Luck.
64256
WOW, you are really doing an over kill if you just want to electrolisize water.\n\nPure water does not conduct electricity.  Water will only conduct when it has ions dissolved in it, the more ions, the better it will conduct.  Tap water does have a small concentration of ions in it,  not much, but enough to make it conduct when you pass 30 volts through it.\nTo increase the conductivity, as you know, you can add some type of electrolyte to the water (like table salt, NaCl).\n\nLet me take a step back right now.\nIf you were to break apart water into pure Hydrogen and Oxygen gas, this only requires a very small voltage, something around 1.5 volts or there abouts (I can look this number up if it is that important to you).  One you have obtained the minimum voltage, it is the current passing through the water the controls the speed of electrolysis.\nAll the voltage over the minimum is called the "over voltage".\n\nWhen you apply a greater voltage than is necesary to the water, you increase the likely hood of reducing/oxidizing things other than water.  Without going into too much detail about the chemistry of it all, you are producing Hydrogen gas at your cathode (-), but at the anode (+), you are probably not producing pure Oxygen, more likely it is Chlorine gas since the Cl- ion is easier to oxidize than the Oxygen in the water.  When you add NaCl to the water, you are only making it easier for it to produce Cl2 gas since it concentration increases.\nThe choice of electrolyte is important as it determines exactly what gasses you will be producing.  In this case, the Cl- ion from the salt is keeping you from making Oxygen gas.  Cl2 gas is very corrosive (not to mention deadly).\n\nThe type of electrode is also very important as some metals will corrode very easily during electrolysis while others are relaitively inert.  Carbon (graphite) and inert metals like platinum, gold and silver (<-- $$$) and popular choices for the anode which is prone to corrosion.  However, for the cathode, you have much greater latitude since the electrode is said to be protected by virture of its charge.\nPersonally, I use carbon-graphite electrodes because of their relative inexpensiveness, however, they do tend to errode over time and need replacing.  When the graphite electodes erode, they leave a fine black powder in suspention in the water which can be filtered out.\n\nLong story short, that slime is most likely the remnants of your electodes corroding away.  Have you noticed you anode betting corroded?\n\nWhat I would do if I were you,\n-switch to graphite electrodes\n-reduce the input voltage in the cell to less than 10 volts (ideally less than 5)\n-use a NaOH electrolye in DI water
428836
I generally follow the recommendations provided by our safety officer at my academic lab.\n\nIf your liquid cultures can afford the extra volume, you can just add a lot of deionized h2o, that should stop the growing (by lysing the cells).  Then toss in the bio-hazard bag, for the autoclave.  \n\nOr, if you have access to an autoclave, then autoclave the culture, and you can probably dump down the drain.\n\nCheck with your safety officer!!\n\nIt was fun thinking about your question.  Pass on the good Karma!
531350
you could do a project of 'rain harvesting'\nconstruct a house,surrounded by a small canal -shaped tank which can hold water when it rains use this water (after purification)for various odd uses.\nit works if you use small plastic tubes as canals\n    OR\n a sugarcane industry is a very good idea(i got a prize for this.)\nbut you need to make crusher,purifier,separator,and drier made of steel or iron.
528555
for something like that you would want to write about some current findings.\ngo to whatever the most prestigious engineering journal in your field is and look what they are printing. Write a report (review, digest, in-depth research) about a subject you find there and which interests you. In natural sciences you would look through Science and Nature. \nAlternatively go to the BBC news website and look at their science and technology news and pick and choose.\nWhere is your imagination???
187885
It depends on which method you are talking about and the end use of the water.  For drinking water they are strictly monitored.  For industrial reuse, you try to balance cost and quality so you can have problems.
84779
First you could look at the label and see if it contains any potentially harmful chemicals to plants, such as sodium, boron, and chlorides or mineral nutrients that plants require, such as potassium, nitrogen, phosphorus, \nmagnesium, calcium, sulfate, etc. Most detergents no longer contain high levels of phosphorus, because phosphates in detergents were once a major water pollution problem.\n\nAnother thing to do is to contact the manufacturer and ask if they have any information on its effects on plants. Many products have a toll-free phone number on the package. \n\nIf you have access to an electrical conductivity (EC) meter, an EC reading on the wash water might indicate if there was a problem with high salinity. \n\nDo a web search for gray water, because many environmentalists advocate using laundry water, bath water, etc. for plant irrigation.