Improved Filtering and Softening Apparatus
An improvement in apparatus for the filtering and softening of water has recently been made in which the fibrous mass which is used to soften the water is arranged so that it can be subjected to a squeezing action by hand or power pressure so as to move excess water from it prior to its treatment with the regenerative agents, and during the process of washing, the mass having been allowed to expand and absorb water during the filtering and softening process. The apparatus is an improvement on a prior patent granted to the inventor, George Grant Hepburn, of ChorltonCum-Hardy, England, No. 1,426,638 and dated August 22, 1922. In this prior invention peat is employed which after use for a time requires to have its water softening powers regenerated.
In the illustration Fig. 1 is a sectional view of the apparatus and Fig. 2 is a plain view of one of the members for agitating or opening out the water filtering and softening material.
The plate f is connected with the upper bifurcated end of a shank n having a plurality of spaced collars o thereon between which latter are movable mounted several multi-arm members m. The collars o on the shank n are so spaced that when the plate f is being raised, the uppermost member m will be positively raised first and the remaining members raised in succession. It will be understood, after the peat has been compressed, the parts m will all firmly engage the collars o at their upper sides. The members m serve, when the plate f is raised, to open out or break up the peat which has been previously compressed and so facilitate the flow of water for softening purposes. A manhole is provided at k for the insertion and withdrawal of the fibrous mass A quartz or other filter bed may be provided at p. The water entering at a passes first through the filter bed p, then through the annular passage q to the filter bed beneath the pressure plate †.
Filtration may take place either in an upward or in a downward direction as may be desired. If in an upward direction b becomes the water inlet and a the water outlet.
The filter bed p may be washed by allowing water to enter at a and leave by the pipe r. If the valve s be open and the valve t be shut, any matter in suspension in the wash water will pass to waste. If however, t be open and s shut such matter which will be from the peat bed if the previous treatment has been effected by an upward filtration through the peat, will be returned to the latter.
In service, the peat, which may have been prepared in accordance with the process of the former patent, is placed in the filter and is allowed to expand freely to the extent permitted by the plate f while the water passes through and is softened. When the softening powers of the peat are exhausted, the water flow is interrupted, the peat is compressed to reduce its bulk and expelling water and a solution of sodium chloride is passed into the peat to regenerate its softening properties The peat is then washed and opened out or broken up by raising of the pressure plate and the members m. The supply of water is now restored and the softening action recommences. The peat may be opened out by the members m after being compressed and before the introduction of sodium chloride for regenerating its water softening properties. Further, after treatment with sodium chloride the peat may be squeezed and then opened out before washing. After washing and before water softening commences, the peat may also be compressed by the plate f.
If desired, the regeneration may be effected by a continuous process, by passing salt solution slowly through the material in the press.
The application for this patent was filed August 20, 1926, the serial number being 658,420. The patent was granted to Mr. Hepburn on February 12, 1924, and its number is 1,483,858.