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Questions related from Jeremy Dudley
This is a bar screen with an automated sprocket and chain raking mechanism. Would regular reversing flow cause damage through buffeting? Would the reverse flow lift / damage chains, carry...
20 May 2022 8,846 0 View
A quick web search found papers that indicate that for N2O reduction conventional SND systems are preferred over short-cut nitrogen removal. Is this just a case of the systems that they analysed,...
12 August 2021 4,432 4 View
Are there any publications with details of where BAF units are installed in France? (or The Netherlands or Belgium, but given size France should have more sites).
30 May 2017 5,746 2 View
The EU urban Wastewater Treatment directive has a limit for COD of 125 mg/l, and for BOD 25 mg/l. The BOD value, from memory, is related to the UK Royal Commission standards from 1904, which also...
07 March 2017 2,524 7 View
What are the conditions that 'gross solids' break up to become 'small solids' and then to become 'sewer solids'? I can find in the literature that 'gross solids' are characterised as 36 mm...
07 November 2016 1,128 6 View
Come across references that ferric, aluminium and PACl, when dosed in a primary tank, cause problems with subsequent dewatering. But they are dosed as dewatering aids. Any suggestions / literature...
30 September 2016 3,540 2 View
The standard texts are good at quoting that a trickling filter needs a minimum wetting rate to ensure even flow - typically around 0.5 m3/m2-h. What is required if the average wetting rate,...
23 February 2016 5,783 4 View
What low-cost methods are available to remove TDS and related conductivity and alkalinity in wastewater?
10 December 2015 1,461 25 View
What is the likelihood of a high-strength (4,000 COD), high-alkalinity (>1,000 mg/l as alkalinity) wastewater dropping from pH 10 to pH 5 in 24 hours? What mechanisms might explain this?
10 December 2015 2,776 7 View
What level of over-reading might be expected for a magflow meter on a partially filled pipe? Is it possible to over-read by a factor of 6? (So a true flow of 20 l/s would be recorded as 120 l/s).
02 July 2015 9,856 3 View
What would be the effect of using a Kalman filter to estimate the state of a system that is under active control? In an activated sludge system the air flow rate is adjusted to maintain a constant...
19 August 2014 1,597 5 View
