IS 2470 -1985 Code Book PDF free download
This Indian Standard ( Part 1 ) ( Second Revision ) was adopted by the Indian Standards Institution on 28 February 1985, after the draft finalized by the Water Supply and Sanitation Sectional ComGttee had been approved by the Civil Engineering Division Council. This standard was first printed in 1963 and subsequently revised in 1968 which covered small installation. Large installation septic tanks were given in IS : 2470 ( Part 2 ) which was first printed in 1961 and subsequently revised in 1971. This revision incorpotxtes the following major changes. Design criteria of septic tank, based on certain assumptions, has been given in detail. Design of inlets and outlets have been modified for the smooth working of the tanks. Arrangements for installing tanks in parallel for the treatment of sewage for population of more than 300 persons have been included. The procedure for the removal of the sludge has been elaborated. This standard covers the design and construction of septic tank for small installations ( up to 20 persons ) as well as large installations. The requirements for secondary treatment and disposal of septic tank efRuent_,have been covered in Part 2 of this Code. The title of the code which was originally ‘Code of practice for design and construction ofseptic tank : Part I Small installations and Part II Large installations’, has also been amended to read ‘Code of practice for installation of septic tanks : Part I Design criteria and construction’. In unsewered areas, if adequate water supply is available for flushing, treatment of the liquid waste in septic tanks is recommended. This code of practice represents a standard of good practice and therefore takes the form of recommendation. Septic tank offers a preliminary treatment of sewage prior to final disposal. Sewage is held in these tanks for some prescribed period during which time the suspended solids present in the storage settle down. The settled sludge and the supernatant liquor undergoes anaerobic digestion. The digestion results in appreciable reduction in the volume of sludge and reduction in organic matter in the liquid. Unsatisfactory design, construction and maintenance of septic tanks constitute a health hazard. It is, therefore, considered essential to lay down minimum standards for guidance of concerned authorities. It is hoped that this code which has been prepared with a view to giving guidance on proper design, construction and maintenance of septic tanks, will be found useful by local bodies, public works departments and others engaged in this field. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS : 2-1960*. The number of significant places retained in the round off value should be the same as that of the specified value in this standard.
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