0333 323 7708

Trade effulent consent & negotiation/cost reduction

Discharging effluent attracts high charges

Water Companies make assumptions & can be wrong

Make sure you are not paying more than is needed

Trade Effluent

The cost of collecting, treating and disposing of trade effluent depends on the volume of effluent discharged and the strength of the waste water. Water Companies assess the volume and strength of trade effluent before it enters the sewers.

Calculating charges for trade effluent

Charges are based on Mogden formula. This takes into account the following relevant costs:

  • Collection
  • Primary treatment
  • Biological treatment
  • Treatment and disposal into the sea
  • Biological oxidation of settled sewage
  • Treatment and disposal of primary sludge

The formula takes into account the level of treatment needed for trade effluent from a particular customer. This means that customers pay less for waste water that is cleaner. This means properly knowing how 'clean' your effluent is potentially makes a real difference to your final bill. 

As each company calculates the average costs for its region, charges do not reflect the costs incurred at any one treatment works. Companies may reduce the collection charge for customers who discharge directly to the treatment works.

Mogden formula

Charges for trade effluent are based on the Mogden formula, which is charge per unit of effluent = R + [(V + Bv) or M] + B(Ot/Os) + S(St/Ss)7

R = reception and conveyance charge [p/m3]

V = primary treatment (volumetric) charge [p/m3]

Bv = additional volume charge if there is biological treatment [p/m3]

M = treatment and disposal charge where effluent goes to sea outfall [p/m3]

B = biological oxidation of settled sewage charge [p/kg]

Ot = Chemical oxygen demand (COD) of effluent after one hour quiescent settlement at ph 7

Os = Chemical oxygen demand (COD) of crude sewage one hour quiescent settlement

S = treatment and disposal of primary sewage sludge charge [p/kg]

St = total suspended solids of effluent at ph 7 [mg/litre]

Ss = total suspended solids of crude sewage [mg/litre]

WMS UK has helped its many clients achieve millions of pounds in refunds and savings through water and sewage overcharges. Are you being overcharged for these services? Let our experienced team answer this question quickly and efficiently for you at no risk.

Start saving now by calling: 0333 323 7708

To book your free initial water audit review call 0333 323 7708 or email: office@watermanagementsolutions.co.uk

Water Management Solutions - Logo