Exam Question

(a) Describe a Vacuum sewage system (8)

(b) With reference to the system described in (a)

(i) State the advantages of the system (2)

(ii) State why a holding tank may be required to be fitted to the system (2)

(iii) State the problems resulting from the retention of untreated sewage in a holding tank (2)

(iv) State the periodic maintenance required on the system (2)