| 摘要 |
1,149,091. Dehydrating sewage sludge. ALBERT KLEIN K.G. 2 May, 1966 [8 May, 1965], No. 19172/66. Heading BID. Sewerage sludge is delivered by pipe 12 and plates 13 on to a travelling band 7 of woven metal or synthetic material having a mesh size greater than the particle size of the sludge, and preliminary drainage under gravity alone enables particles to bridge the meshes to form a layer of sludge which is then pressed as band 7 passes under pressure band 21. Bands 7, 21 are both driven, possibly at different speeds, and are spaced so that the vertical compression increases to a maximum and then remains constant in the direction of movement. Staggering of supporting rollers 9, 25 creates shearing in the sludge, assisting dehydration. Rollers 25 are adjustable on resiliently loaded frame 16. A brush-like roller 26 under the sieve band causes dehydrated sludge to adhere to pressure band 21 from which scraper 27 removes it. Band 21 is of elastomeric material and possibly has an adhesive layer in addition. Brushes 14, 29, 30 remove water from band 7 and its guide rollers 5, 6, and the return run of band 7 is cleaned by rotary brushes 31 and high pressure water jets incorporated in brushes 32 in rinsing bath 11. The sieve band 7 may have a mesh size of 0.5 to 2 mm., and 20 to 50% of its upper run may be upstream of the pressure band. |
