CONTENTS.PartI.ByLieut.-Colonel ALFRED S. JONES,V.C.PAGEIntroductory1The Chemist Dibdin discards Chemical Precipitation in favour of M. Pasteur’s Aerobic Organisms3The Cleanly and the Dirty (Septic) Processes for Sludge Removal5The Best possible Medium for Aerobic Organisms to Work in5Tabular Statement derived from the Leeds Official Report of Experiments7The Wrexham Sewage Farm8The Camp Farm, Aldershot, to which Six other Areas of Sewage Works have been added from July 28, 19029Evidence and Reports of Lord Iddesleigh’s Royal Commission, 1898-190215Automatic Appliances for Sewage and Effluent Discharge17Sludge Treatment19Cropping a Sewage Farm21Importance of having Tidy Contour Carriers Accurately Levelled23Summary of the Experience of a Lifetime23Anticipation of a Coming Reaction against Over-ridden “Fads” and too much Pressure in Sanitation25PartII.By H. ALFRED ROECHLING.I.Introductory Remarks28II.The Sewage Question during the Last Century: a Short Retrospect29III.The Subsoil:1. Mechanical structure of soil412. Permeability of soil423. Water capacity of soil424. Water-retentive power of soil435. Capillary movements of water in soil446. Temperature of soil457. Subsoil air478. Movements of water in soil479. Micro-organic life in soil5010. Absorbing powers of soil51IV.Self-Purifying Powers of Soil. Natural Self-Purification of Sewage52V.Artificial Self-Purification of Sewage:1. General observations682. Artificial self-purification of sewage in intermittent contact beds:a.Name of process70b.Explanation of process71c.Water capacity of bed, and silting up73d.Absorbing powers of filling material78e.Consumption of oxygen by the filling material79f.Formation of carbonic acid80g.Nitrogen80h.Formation of nitric acid803. Artificial self-purification of sewage in septic tanks:a.Name of septic tank81b.Covered or open septic tank81c.Explanation of process83d.Velocity of flow through tank85e.Destruction and liquefaction of sludge in septic tanks87f.Formation of gas in septic tank88g.Mixing action of septic tank89h.Micro-organisms in effluent from septic tank894. Continuous contact beds89VI.Management of Plants for the Artificial Self-Purification of Sewage90VII.Some Observations on the Deposition of Suspended Matters in Tanks91VIII.Concluding Remarks93Postscript95
CONTENTS.
PartI.ByLieut.-Colonel ALFRED S. JONES,V.C.
PartII.By H. ALFRED ROECHLING.