Method for treating ammonia nitrogen in charking deposed ammonia

Abstract

This invention relates to a method for treating ammonia-nitrogen in waste coking ammonia solution. The method comprises: (1) adding desulfurizing agent 15-35 g/L to waste coking ammonia solution, and adjusting the pH value to 10-14; (2) introducing into a reactor for reaction; (3) introducing waste ammonium solution into an immersing-type blowing desorption unit, and introducing coke oven coal gas into the first and the second gas distributors below the liquid level of the desorption unit; (4) introducing desorbed waste ammonia into an active sludge treatment unit with a pump; (5) cooling the desorbed ammonia-containing coal gas, and introducing into a coke oven coal gas main pipe; (6) introducing mixed coal gas with a blower into an ammonium sulfate saturating unit, and reacting with sulfuric acid to obtain ammonium sulfate; (7) introducing most coal gas into a coarse benzene recovering unit, and sending to fuel gas plants or coke ovens; (8) introducing other coal gases into the immersing-type blowing desorption unit for recycling. This invention has such advantages as improved ammonia-nitrogen removal efficiency, saved energy, reduced cost, and lowered ammonia-nitrogen loading for biotreatment, and is environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of coking waste ammonia water treatment. In particular, it relates to a treatment method directly applied to ammonia nitrogen in residual ammonia water or waste ammonia water of a coking plant. Background technique [0002] In the remaining ammonia water produced during the production process of the coking plant, the ammonia nitrogen is composed of volatile ammonium salt and fixed ammonium salt, and the volatile ammonium salt has NH 4 OH, (NH 4 ) 2 S, NH 4 CN and (NH 4 ) 2 CO 3 , the fixed ammonium salt has NH 4 Cl and (NH 4 ) 2 SO 4 Wait. [0003] At present, coking plants at home and abroad generally use the steam method to remove ammonia nitrogen in the remaining ammonia water, that is, the remaining ammonia water after oil removal is heated to 90°C by the ammonia water heat exchanger, and then enters the upper part of the ammonia water distillation tower, and steam is passed into the bottom of...

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Problems solved by technology

[0005] In the above-mentioned technologies, the former adopts large ammonia distillation tower equipment, high operating temperature of water vapor desorption, high energy consumption, high cost, and low removal rate of total ammonia nitrogen, so that the ammonia nitrogen load of activated sludge biochemical treatment is relatively large

Therefore, the treatment of coking plant wastewater has been difficult to meet the national water quality discharge standards for a long time

The latter uses a through-flow sieve plate tower with large equipment and high operating temperature. In order to maintain the residual ammonia water in the through-flow sieve plate desorption tower at 85-90°C, multiple steam heaters are used to heat it, which consumes a lot of energy. , high cost and low removal rate of total ammonia nitrogen, so that the load of activated sludge biochemical treatment is relatively large

Therefore, the treatment of coking plant wastewater has been difficult to meet the national water quality discharge standards for a long time

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