Recent content by ozfish

Hi Chemeng01. The Mn increase was noted even without the addition of KmNO4. The posts above have indicated the increase is most likely due to CO2 rich ground water. In this situation the ground water has C02 levels above 150ppm. With regard to the recharge, I was adding the KmNO4 after typical...

Thanks again for the replies. I have some capacity to aerate prior to filtration. As the source water also contains Fe2+ I would like to investigate sedimentation prior to filtration. Can you recommend some ideas and possibly some literature for sedimentation or prefiltration that is practicle...

Thank you both for your information. Semo, I tried a few jar tests using the media without charging and also found an increase in the Mn over the initial value. Would I be correct to assume that this may be due to the CO2 in the water stripping the Mn coating off the media?

I have a question regarding Greensand leahing further Mn into fitrate water. I am running a trial using a greensand filter to remove 2ppm of Mn in groundwater. I have followed the manufacturers instructions and am suprised to note the Mn is increasing once passing through the filter! Mn after...

Not sure how to specify the pressure requirement of a pump when sizing a pump for a deep bed pressurized sand filter (Total bed depth 2 metres in six graded layers) with a desired flow rate of 120-180litres per min. The pump is for duty only. The filter is 1.8m in dia. In addition am I correct...

Thanks for your reply. Will the rise in pH prevent the H2S removal or just slow it down. What is the normal practice for removing both? Regards

Is it possible to remove Hydrogen Sulphide and or CO2 dissolved in groundwater (pH 5.4) by passing the water through a vacuum?

EdStainless thanks for your info. Can I take you up on your offer to assist - supply? How will I contact you?

Thanks for the advice. I have been advised of this in the past. We do have some chlorides in the ground water. The 2205 is not readily available in Australia and I was advised by Sandvik in OZ that they could not import a small qty - I need around 20 x 6m lengths.

I have 50mm hollow 316 TUBE with 80-100 deg C air running through - on the outside of the pipe I have 17-20 deg C bore (ground) water low in calcium some iron and manganese running past the tubes. The Tubes are pitting on the outside and failing. I considered teflon coating but this would...

Hi BIMR I have lab results. Ca total = 2.4mg/l Magnesium total = 22 Iron total = 22mg/l Manganese total = 2.1 Alkalinity = total as CaCO3 = 25mg/l Hardness Calcium as CaCO3 = 29mg/l Hardness Magnesium = 64mg/l Hardness Total = 93mg/l I have also had some testing done on the fish being grown in...

Bimr thanks for your input. The water is used for aquaculture - growing warm water finfish, hence all iron manganese must be removed. Iron level has been confirmed by a lab. I will send full water analysis later today. I beleive the supply water has significant CO2. Taking the pH behond 7...

pH before adding NaOH is 5.4 Aeration takes the pH up to around 6.4 max and then begins to drop as the iron oxide begins to precipitate. Calcite filter may work however I am concerned that the calcite may become clogged or establish a film after several weeks which will prevent it from working...

I have ground water high in iron and low in Calcium and Mangnesium. Iron approx 47mg/l Ca approx 2mg/l Mg approx 7mg/l I presently use NaOH to raise the pH to precipitate the iron prior to filtering. The resulting water is poorly buffered and used for aquaculture where hardness should be in...

I have revisited this thread because I am still encounterign some problems. I can make a few more points. a. The biofilters and the fish create the CO2 which drops the pH - hence the reason for adding the bicarb in the first place (raise pH and buffer against constant CO2 production) b...