Additional pollutants and deposition potential from garbage disposers

The objectives of this study were to (a) characterise the quantity and qual ity of crude sewage, as might be influenced by the use of domestic garbage disposers, and (b) examine the deposition potential;of wastewater solids in gravitational sewerage systems. Ground particles of organic origin require relatively low self-cleansing ve locities, and therefore conform with the usual design recommendations of gr avitational sewers, with no expected deposition problems. However, 'heavy' particles which are characterised by specific densities exceeding 2 and wit h sizes >1 mm, might cause deposition and associated problems. Where sewers are manufactured from smooth material, calculations indicate that higher s couring velocities than those recommended in the literature are required. M inimising the size of ground material by regulating the particle-size distr ibution produced by approved garbage disposers should mitigate the problem which is caused by deposition.