Waste Water Engineering
The presence of free ammonia in sewage, is detected by

Adding sulphuric acid
Boiling
Adding potassium permanganate
Phenol-di-sulphuric acid

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Waste Water Engineering
In septic tanks,

All listed here
Free board of 0.3 m may be provided
The clear space between the baffle top and covering slab is about 7.5 cm
The baffles or tees are extended up to top level of scum

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