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sludge

Sludge is a semi-solid slurry that can be produced from a range of industrial processes, from water treatment, wastewater treatment or on-site sanitation systems. For example, it can be produced as a settled suspension obtained from conventional drinking water treatment, as sewage sludge from wastewater treatment processes: 23–25  or as fecal sludge from pit latrines and septic tanks. The term is also sometimes used as a generic term for solids separated from suspension in a liquid; this 'soupy' material usually contains significant quantities of 'interstitial' water (between the solid particles). Sludge can consist of a variety of particles, such as animal manure.Industrial wastewater treatment plants produce solids that are also referred to as sludge. This can be generated from biological or physical-chemical processes.
In the activated sludge process for wastewater treatment, the terms "waste activated sludge" and "return activated sludge" are used.
In food processing and beverage-making industries, sludge can have high protein content and other nutrients that can be used for beneficial purposes such as animal feed, thereby avoiding disposal at a landfill.

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  1. P

    PJ

    I have a baffling problem with my central heating if anyone can help? I have no heat getting to two rads upstairs. I have had a power flush, new pump fitted and magnatec fitted. I have also replaced most of the pipes leading to both these rads the problem still persists. I thought i might be the...
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  2. P

    ch expansion tank

    i recently fitted a wood burning stove with boiler and i notice that my radiator in a little upstairs room is not heating up. ive tried bleeding it but it doesnt work. its as if theres not enough pressure to force the air out of the radiator. Could my expansion tank in the roofspace be too...
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  3. A

    leaking hot water cylinder

    Hi chaps, Just a quick one on a leaking hot water cylinder - once a connection starts to leak , is the only option to replace the cylinder? See attached shot - the connection runs from the base of the cylinder to the bottom of the external immersion heater. As you can see it is well corroded...
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  4. M

    Central heating in need of some professional TLC

    Hi to everyone. My central heating system is an 8mm microbore system, over 17 years old,with 11 radiators attached. Quite recently I noticed that occasionally the heating does not come on when the temperature drops. The thermostat clicks in, the boiler clicks as though it is about to fire up...
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  5. G

    Continual drip on return to boiler

    Recently installed unvented system with Magnaclean filter above boiler. There is a continuous drip which appears to be the Magnaclean. Happens when the boiler is running. System was apparently washed out before start up. Is this usual? Would the filter be clogged up after 2 weeks running?
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  6. G

    cold rads

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  7. R

    Cool Radiators Downstairs

    Hi guys and girls, I'm a first time poster so apologies if my knowledge comes across a tad green. My system is a standard boiler system (i.e. not a combi). I've got an issue where my radiators downstairs are cooler than the ones upstairs. The upstairs ones are nice and hot but the downstairs...
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  8. I

    ideal

    hi guys i am a sparky over from the dark side came home today to find the house cold stat calling pump running but boiler dead its and ideal classic 250ff 12yrs old fully serviced took the cover off to see if it was live and spotted the over heat reset button was out so reset it and its been...
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  9. R

    Air in my system Advice Please

    Hi guys have an old open vented system. I have lived in the house for 3 years and have always had some some air in the system. A few weeks ago I decided enough was enough. So I took every rad off and flushed them through. Then flushed the system through with Sentinel X400 system restorer and...
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  10. Q

    C/h problem

    HI all got a bit of a problem. I have a house with 12 rads in. I installed a new bigger rad in the main living room. Since this I have a problem I get a rad that does not get hot but its not always the same 1? last time it was in the small living room now its in the bathroom? Other times it will...
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  11. P

    Circulating Pump Valves

    Hi - I'm hoping that I'm posting this is the correct section. Some impartial advice would be appreciated.... I have replaced both the gate-type pump valves on my DHW/CH system. Since replacing the valves, my downstairs radiators are only getting luke-warm, and the furthest radiator isn't...
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  12. P

    Potterton 30HE DHW cut out problem

    Hi, I have a problem with the above boiler. The hot waters keeps cutting out. Symtoms are as follows: - Runs for 10 - 30 second. Temp led's get to 80 then the burner cuts out. - Burner cuts back in after approx 5 seconds. - Central heating is fine - The problem occurs more frequently...
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  13. G

    Expansion pipe running

    Does anyone know what the strange looking contraption is in my attachment? I have had trouble with the expansion pipe running over back into the heating header tank unless I set my pump to its lowest setting, but then not all the radiators heat up. I just discovered today that if I blocked off...
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  14. R

    Chaffotaeux brittony 100 combi

    Hi, Need a bit of help with a Chafotaux Brittony Cobi 100 boiler. Only getting some heat to the closest rads to the boiler. Checked valves, air etc and all ok. Checked the pump and it was really hot although it was spinning freely and vented. DHW okay. Does the pump need replacing??? Cheers
    • rob jefkins
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  15. D

    cistern trickling down into bowl and constantly filling up again

    Hi i have an issue on my toilet where the cistern trickles water into the bowl - and eventually the top up system kicks in to fill the cystern up again - this is an annoyance due to the water wastage - where would you suggest to look first to rectify the issue. thanks.
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  16. C

    Moving a bolier from outside - more advice please!

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  17. P

    Ferroli Modena 80E not playing!

    Hi all, just been round to take a butchers at their boiler, working fine with DHW but when demanding CH the boiler fires, pressure rises to around 2.5 Bar then the boiler shuts down and the pressure drops quite quickly back down to 1.2 bar. The needle on the pressure clock is very 'Jerky' It...
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  18. G

    Power flush or new rads

    My plummer is fitting a new Worcester Greenstar 37cdi in my house. I have 11 rads, 8 old ones and 3 new ones. My plummer is recommending a power flush, but I'm thinking should I replace the old rads instead. If I do replace the old rads would I still need a power flush?
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  19. T

    Advice needed please!

    Hi, I need some advice please. I have developed what I assume to be a problem in my hot water system and just want to check what the likely causes may be, if anyone can help it would be much appreciated. I have a gas fired boiler which heats the water and the radiators, recently when the boiler...
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  20. S

    Recurring kettling in CH

    Hi all This is my first post! :) I have had some kettling in my Potterton CH system for a few years now. I have had the system flushed, and power flushed, and after the powerflush (March 09) I also had a magnaclean fitted. The flushes were both caried out by a family member who is a BG...
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