1. Disposal and utilisation of sewage sludge.;Ashton;Proc. Ass. Mgrs. Sewage Disp. Wks.,1904
2. Hoyland , G. Ronald , D. Biological filtration of finely screened sewage WRc Technical Report 198 April 1984
3. epartment of the nvironment UK Sewage Sludge Survey. Final Report February 1993
4. The influence of sludge storage on chemical conditioning costs.;Williamson;Wat. Pollut. Control,1981