Page 23 - Water Pollution Management - Environmetal Legislation - Your Responsibility

Discharge to foul sewer

• Regulated by the utility company that is responsible for the sewers and the operation of the sewage-treatment works
through which the effluent will pass

• Such companies are designated as Water and Sewerage Undertakers and have powers to consent to discharge under the
Water Industry Act 1991

• They will set limits on the content of the discharge so it will not harm:
o Sewage Treatment process You have to pay to use the Sewer
o People who work in the sewage system
o Sewage system itself The more concentrated the effluent the
higher the charge
• Common consented conditions:

o Flow Rate Even dilute effluents will be subjected to a
o Daily Volume charge
o Time of Discharge
o Temperature Dilution will not reduce the overall costs
o pH
o Toxic Metals Cost calculated using the Modgen
o Suspended Solids Formula
o Ammonia
o Sampling and Monitoring Cost = Volume x Strength

o Chemical Oxygen Demand (COD)

No flammable substances are permitted to be discharged

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