Hopewell Molefe

20 Questions 58 Answers 0 Followers

Questions related from Hopewell Molefe

How can I use Visual basic to simulate a typical wastewater treatment plant system?

I wish to simulate a typical system like a nitrogen removal system such as MLE system, N and P removal system like UCT and JHB system because I have the steady state design models for each unit...

17 December 2016 1,147 21 View

Can AspenTech be used for modelling biological wastewater treatment plants?

I was just wondering if I could use Aspen to model biological wastewater treatment plants with the following units? primary settling tank & secondary settling tank biological reactor...

28 November 2016 7,477 9 View

Gravity Thickening of Waste Activated Sludge, typical Solids loading rate?

In my design I will be thickening the WAS by a gravity thickener and I'd like to know some typical solids loading rate i.e. kgTSS/m2.d. I'd be thickening the solids to 6% solids conc. (60000...

08 November 2016 3,372 5 View

Why would Ground water have a bad smell?

Water is being drilled from underground and pumped to tank reservoirs at relatively high elevation and is distributed by gravity feed to the residential areas in the village. The water is crystal...

26 May 2016 1,679 10 View

Could ferric chloride be the course for my chloride problem? Is it dissociating may be?

I use ferric chloride (FeCl3) as a coagulant in my effluent treatment. on one particular run the concentration of chloride ions is twice the chlorides in the feed. Why is this so? Why am I ending...

26 November 2015 2,687 3 View

What would theoretically be an optimum pH for precipitating Sodium Sulphate?

I have achieved significant success in reducing my sulphates in the effluent by dosing calculated quantities of lime Ca(OH)2. I found that I reduce the most sulphates out the optimum ph range is...

06 July 2015 2,132 6 View

What are key parameters when designing a settling tank?

I want to specify the conical tank I need from the supplier, please any information/heuristics to design a settling tank. I'm treating 10 000 Litres/day of effluent every day from our plant before...

17 June 2015 628 5 View

What would be an alternative of testing for chlorides in the effluent?

What else can I use apart from titration with expensive silver nitrate and mercury nitrate methods? I have to test for chlorides in my effluent, I'm struggling to get silver nitrate solution so...

29 May 2015 4,916 13 View

What are the advantages of using organic coagulants instead of Inorganic like Ferric Chloride and Aluminium Sulphate?

I treat about 20 000 L of effluent before discharge aiming to correct the pH, Conductivity, reduce sulphates and chlorides to below 1500 mg/l. Reducing the COD as well to levels below 5000 mg/l. I...

27 May 2015 3,611 7 View

What mass % solution of Aluminium sulphates would be suitable for coagulation?

I have been using Ferric chloride as coagulant on a lab (1Litre Jar), on a pilot scale (treating 1000L of influent) and on one of my sumps treating 9000L of influent. I have a lot aluminium...

20 May 2015 5,840 13 View

How much energy is released during reaction of sulfuric acid with water?

How are many kJ/mol of energy released in the exorthermic reaction of sulphuric acid and water?

23 April 2015 3,575 2 View

How long can residence time be for aeration in a small scale (running a pilot plant)?

I'm running a pilot plant doing lime treatment for pH correction and reduction of sulphates through the precipitation of gypsum. The results so far they show that my pilot plant is working well to...

01 April 2015 746 3 View

How do I estimate the dissolution time of NaOH flakes in a larger scale?

I have conducted an experiment to make 45% NaOH solution using caustic flakes in a 1L theoretically I should have added 450g which gave a solution of about 40% and had to add 250g extra to make...

30 March 2015 5,203 3 View

Does anyone have literature on doing sodium hydroxide flakes dissolution on an industrial scale?

We currently want want to make NaOH solution from sodium hydroxide flakes which we already have, we use caustic soda for making sodium hypochlorite. I have conducted experiments on the lab scale...

23 March 2015 6,720 7 View

Can I use the sludge resulting from Coagulation with ferric Chloride as seeds?

I have just completed running jar tests in our lab and the results show that I can correct acidic pH and reduce the sulphates from our wastewater by lime treatement, thus forming gypsum sludge and...

20 March 2015 5,283 4 View

Am I dosing the correct amount of lime per litre of sample of waste effluent?

I'm doing experiments to see if I can use lime to correct our effluent's acidic pH while managing to precipitate sulphates as gypsum sludge and other metal hydroxide sludge Me(OH)2 or Me(OH)3. So...

17 March 2015 6,431 9 View

Which DR Colorimeter can I use to measure sulphate concentration greater than 1500 mg/l?

My colorometer (DR/890) only measures maximum of 80 mg/l sulphate concentration. I can still use it with a different reagent for my range of interest but it will not give me an exact value but a...

04 March 2015 7,257 3 View

What to consider when removing chlorides from wastewater by a filtration process?

Could you advice on a better (less costly) method for removing chlorides from effluent wastewater? I want to reduce my chlorides concentration to a level below 1500mg/l before discharge through...

02 March 2015 5,098 7 View

How can I reduce concentration of sulphates and COD in the plant effluent with biological treatment?

We would like to biologically treat our effluent waste to reduce our sulphates content in the effluent discharge through the municipal sewer and reduce the COD as well. We're currently sorting out...

05 February 2015 8,678 6 View

How can one reduce sulphates and chlorides concentration in the waste effluent?

Please any advice the effluent must betreated for ions like sulphates and chlorides I have read about the Reverse Osmosis and other available technologies that can be used to reduce the...

28 January 2015 4,475 18 View