engineering recuitment TNPSC AE Civil 2024 Test series Environmental Engineering Sewage Sewage Treatment
Sludge volume index is defined as the ratio of
1
percentage of sludge by volume to percentage of total solids by weight
2
percentage of suspended solids by weight to percentage of sludge by volume
3
percentage of total solids by weight to percentage of sludge by volume
4
percentage of sludge by volume to percentage of suspended solids by weight