Device and method for synchronously removing ammonia nitrogen and sulfide of strong alkaline wastewater

Abstract

The invention provides a device and a method for synchronously removing ammonia nitrogen and sulfide of strong alkaline wastewater, and belongs to the technical field of wastewater treatment. The method comprises the steps of pouring strong alkaline wastewater into a reaction tower, and synchronously adding a catalyst which is manganese chloride or manganese sulfate; standing, then charging air, performing oxidation reaction through oxygen in the air to remove sulfide from the wastewater, introducing ammonia molecules from a liquid phase into a gas phase through bubble formed by the air, and then transferring into a subsequent waste gas absorbing device through a gas outlet of the reaction tower; standing to naturally precipitate; draining supernate through a water outlet of the reaction tower; discharging the rest solid-liquid mixture from the reaction tower through a slag discharging opening of the reaction tower so as to achieve the treatment of synchronously removing ammonia nitrogen and sulfide of the strong alkaline wastewater. The method is applicable to treatment of ammonia nitrogen and sulfide containing strong alkaline wastewater, in particular carbide-slag slurry supernate produced by preparing acetylene by the calcium carbide method; the process line is simple; the operation cost and energy consumption can be effectively saved.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a device and a method for simultaneously removing ammonia nitrogen and sulfide from strongly alkaline waste water produced in a process for producing acetylene by a calcium carbide method. Background technique [0002] In the process of producing acetylene by the calcium carbide method, when the raw material calcium carbide reacts with water, a large amount of calcium carbide slurry is released while the acetylene gas is released. The calcium carbide slurry from the acetylene generator flows into the sedimentation tank through overflow, and is deposited in the sedimentation tank. After mechanical dehydration and clarification in the pool to achieve solid-liquid separation, calcium carbide slag is discharged from the sludge discharge hopper, while the supernatant liquid (supernatant liquid) is relatively alkaline in the chlor-alkali system due to its high ...

AI Technical Summary

Problems solved by technology

According to conventional treatment methods, sulfide and ammonia nitrogen often need to be treated separately, and at the same time, pH and temperature adjustments are required during the treatment process, resulting in increased treatment costs, complicated treatment processes, and increased energy consumption.

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