Desulfurization ammonia nitrogen wastewater processing method

Abstract

The invention discloses a desulfurization ammonia nitrogen wastewater processing method. A desulfurization ammonia nitrogen wastewater processing system device used in the method comprises a raw waterprimary settling pond for wastewater sedimentation, a coagulation reaction precipitation device for precipitating and recovering heavy metals, a calcium and magnesium removal device for removing calcium and magnesium ions, a negative pressure deamination system for deamination, an electric flocculation device for flocculating and removing residual heavy metals, and an ammonia washing purifier fortail gas processing, a water distributor is arranged in the ammonia washing purifier, and a water seal structure is arranged below the water distributor of the ammonia washing purifier. Through the arrangement of the negative pressure deamination system, the deamination temperature in the whole deamination process is reduced by utilizing the principle that the boiling point of a liquid phase is greatly reduced in a negative pressure state, so that the whole system can perform efficient deamination in a relatively low temperature state, the energy consumption can be greatly reduced, and the steam consumption is reduced; ammonia water and heavy metals can be recycled while ammonia nitrogen and heavy metals are removed, waste is turned into wealth, and secondary pollution is prevented.

Description

technical field [0001] The invention belongs to the technical field of desulfurization wastewater treatment and relates to a treatment method for desulfurization ammonia nitrogen wastewater. Background technique [0002] Ammonia nitrogen sewage produced in the process of industrial production will cause serious water pollution, affecting surface water, groundwater, soil and crop pollution. Therefore, ammonia nitrogen sewage needs to be treated before being discharged, and ammonia water can be recycled as an energy source. In the prior art, the conventional solution is the ammonia distillation process, using the high temperature in the tower to boil the ammonia-containing nitrogen water to remove ammonia, condensing the ammonia vapor with a condenser, recovering dilute ammonia water, and controlling the reflux ratio to achieve the required ammonia water concentration. However, the steam consumption of the existing ammonia distillation process is large (130-150kg / ton water), ...

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Problems solved by technology

However, the steam consumption of the existing ammonia distillation process is large (130-150kg / ton water), and the steam pressure requirement is also high (≥0.4MPa)

[0003] In addition, in actual use, there is often not only one source of ammonia nitrogen sewage, especially in the process of ammonia-acid flue gas desulfurization treatment, in addition to sintered limestone-gypsum wet desulfurization wastewater, there are also waste water from the acid system and ammonia station System wastewater, if it is treated separately, multiple sets of wastewater treatment systems are required, the equipment cost is high, and the floor area is large

Moreover, these waste waters have high water hardness, heavy metals, and a lot of suspended matter. If the ammonia is directly stripped and steamed, the deammonization effect will not be good, and the trays will easily scale. Heavy metals are also mixed with lime residue, making subsequent treatment difficult.

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