Recent content by rww63

Guys I just wanted to say thanks for all the help, I got there in the end, once again thanks for the help and the patients.

From what I can gather after many hours going in circles and after speaking with yourelf; Total hardness is 4.5 million litres @ 150 CaCO3 mg l-1 150 = (0.7 feed x 4) + (Raw x 660) Multiply the CaCO3 values by 4.5; 675 = (0.7 feed x 18) + (Raw x 2970) 70% of the feed is 462, enter info into...

sorry guys i am still struggling to grasp this, Chemistree do you concur with hairypalms calcualtions?

i really do appreciate all the help and direction Chemistree... so I need to calculate the amount of treated 4ppm water it will take to dilute the 4.5 million litres at 660 CaC03 down to just 60 ppm, i can't wait to get home to get working on this.

hi guys, could someone please have a look at the thread below, i think it is more a math issue and think this is probably the best place to look for assistance. thank you so very much. https://www.physicsforums.com/showthread.php?p=1633614#post1633614

breaking down CaCO3 into its relevant atomic mass; CACO3 is 1 part C with an atomic weight of 40 and 3 parts oxygen whose atomic weight is 12 + (16x3) = 60 Total hardness (as mg l-1 CaCO3) 660 – 4 = 656 656 / 660 x 100 = 99.4% total removed by reverse osmosis plant. Total hardness of...

please excuse my idioticity, i take it MW is molecular weight so; Ca is 40 CO3 is 1 part C and 3 parts oxygen which is 12 + (16x3) = 60 again though i don't understand the term "n" relocations? do you mean number?

thanks for replying, I am sorry but i don't understand your answer, what is "N" reocations? and what is MW? also how do you get 40 and 60 respectively?

in order for a well to supply 4.5 million litres of drinking water per day, at a minimum total hardness of 60mg l-1 as Ca, calculate the daily throughput of the reverse osmosis plant assuming that 30% of the feed to the plant comes out as reject. Homework Equations a table provides the...

guys I am only a newbie to both the sciences and this great website, I am not looking for an exact answer but just a clue of how to tackle this question. if any further questions is needed please reply, i really am going off my head trying to get over this mental block I am having.

Homework Statement in order for a well to supply 4.5 million litres of drinking water per day, at a minimum total hardness of 60mg l-1 as Ca, calculate the daily throughput of the reverse osmosis plant assuming that 30% of the feed to the plant comes out as reject. Homework Equations a...