Process for the purification of waste water containing ammonia a

Details Process for the purification of waste water containing ammonia a Process for the purification of waste water containing ammonia a

1977-05-20

1979-01-30

Spear, Jr., Frank A.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210DIG28, C02B 136

Patent

active

041371666

ABSTRACT:
There is provided a process for the purification of ammonia or ammonium salt containing waste waters using alkali metal or alkaline earth metal hypochlorites comprising adjusting the waste water to an initial pH of 8-10.5 with an alkaline material and then treating the waste water with an alkali metal or alkaline earth metal hypochlorite in an amount practically equivalent to the ammonia or ammonium salt, in a given case while lowering the pH during the evolution of nitrogen by additional neutralization of this pH to about 6-8 whereupon only after the end of the evolution of nitrogen the pH of the waste water, if it deviates from 7, is adjusted to the neutral region in known manner. The initial pH is preferably adjusted with the help of an alkali or alkaline earth hydroxide, most preferably it is adjusted to a pH of 8-9 with the help of a buffer salt.

REFERENCES:
patent: 3732164 (1973-05-01), Pressley et al.
patent: 3733266 (1973-05-01), Bishop et al.
Garrison; W. E. et al., "Improved Hypochlorination Techniques and Problems in Disinfection of Municipal Wastewaters Containing Refinery Thiosulfate", Proc. of the 28th Eng. Waste Conf. of Purdue University, pp. 309-322 (1973).

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