RESEARCHES ON THE REDUCTION OF ACID POLLUTION

S.E. NISIPEANU, INCDPM Romania

SUMMARY

The researches aimed at the development of a technology for the reduction of the acid pollution generated by nitrogen oxides that, with low costs, can provide an efficient neutralization with no transfer of polluting agents to other environment factors and with the possibility of using the by-products.

The research objective was the neutralization of acid emissions of nitrogen oxides resulted from:

The objective was achieved starting from:

The laboratory experimental study included researches on the absorption of the nitrogen oxides in the solution of sodium hypo -chlorite in sodium hydroxide and in urea solution in nitric acid.

The operation requirements to obtain a maximum absorption degree that would allow the reduction of emissions below the admitted values were settled.

The applications of neutralization by absorption in liquid system of nitrogen oxides were developed in industrial conditions in a pilot absorption three-step column for which a patent was issued.

The experimental results revealed the performance of the developed technology on the neutralization of nitrogen oxides in the absorption solution of sodium hypo-chlorite in sodium hydroxide (absorption degree of 93%) and urea in nitric acid (absorption degree above 95%).

Neutralization by absorption in liquid system can be an effective solution for the reduction of atmospheric pollution with acid contaminants exhausted from industrial processes.