Diquat is not a good idea as will remain active through your final effleunt and will get into the river and kill that too. Your duck weed will double roughly every 24 hours, so skimming will control but not eliminate your problem. If the weed is staying in the tank and not contaminating your...
We have used a live floor loading hopper taking 2x 30 tonne tippers at a time, which feeds into a twin covered auger. We do get some leaching from the belt, so be sure to have adequate draiange and wash down facilites.
We dose quick lime into the twin augers and then pass into a plough shere...
Off gasing and airlocks can be a major problem, especially if your plant is in an area with warmer temperatures, in which case you may need to chill your hypo to reduce the gasing. Normally I would do everything I can to prevent negative suction pressure with hypo. Are you using diaphragm dosing...
We operate on softened carrier water on plants up to 160 Mg/d. Scale will form at the point where hypo meets unsoftened water forming calcium or magnesium carbonates due to the pH of the hypo - If your total hardness is <40ppm you shouldbe able to use un softerned carrier water without too many...
Usually in the region 0.2mgl. If you don't have dilution water you need to approximate the polymer viscosity to that of the sludge to aid mixing. If your are dosing to raw water your batches should be in the around 0.05mgl
If circular clarifiers I use round road sweeper brushes sized to fit the channel. The bridge pulls them round. If you cut them in half to they can be sized to fit over the tops of the weirs and clean those too. Cheap and simple.
Does the wet well operate at a higher level in the wet weather? If so higher suction head solves the problem. Maybe your problem is suction head rather than delivery? You can modify the suction pipework to reduce head loss,
trim impellers on a couple of pumps or fit car's to over come the issue.
3pg + I +e where p is population equivalent g is water use per head I is infiltration (ground water leaking into old sewers) and e is industrial input. Typical values for each can be found on the web. diurnal flow typically varies 1.5 to 1.8 times the value over the day. Night time 3 am being...
Your best way to find out is to take a pilot scale sample of MLSS from your bio-ox and run it for a couple of days on your normal settled sewage spiked with the mix of hydrocarbon you mention. Run a second control vessel along side using your normal settled sewage.
How many stages or media types in your filter? Anthracite, courser sand, finer sand, gravel?
Are you doing a collapsed pulse (combined water/air) BW or individual aire then water stages? If your leaking media, where is it appearing? It could be beign lost during backwash or else through damaged...
Misunderstood in thinking you were going straight from ASP to filter with no settlement in between. Assuming a post FST solids loading of 20mg/l + whatever your hydroxide loading will be, it will work without pre-settlement, but your washing will be increased.
Absolutely, settlement is a must. At normal RGF flow rates of 10m3/m2 per hour at a MLSS of 3000mg/l thats 30kg of solids loading per m2 per hour. Your filter will last a matter of minutes rather than hours between washes, especially if operating contact filtration through.
