Device and method for treating ammonia water and hydrogen peroxide wastewater

Abstract

The invention provides a device and a method for treating ammonia water and hydrogen peroxide wastewater, and belongs to the technical field of sewage treatment. The device comprises at least two buffer tanks connected with a workshop process machine table, a sealing cover plate is arranged at the top of every buffer tank, the sealing cover plates are connected with an alkaline gas adsorption tower, the buffer tanks are connected with a wastewater treatment station, ammonia water and hydrogen peroxide from the workshop process machine table are collected, then are discharged into one of the buffer tanks, and stand for a reaction, and a gas generated by the reaction is discharged into air after being treated by the alkaline gas adsorption tower. The buffer tanks stand and react for 20 d, and a decomposition and redox reaction of hydrogen peroxide and ammonia water is utilized, so 90% or above of ammonia nitrogen can be degraded, and 99.99% or above of hydrogen peroxide can be degraded.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to an ammonia water and hydrogen peroxide wastewater treatment device and method. Background technique [0002] One of the most important features in the conventional black silicon texturing process for cell production is that 28% NH4OH and 31% H2O2 are used as texturing agents in the process, and the dosage is relatively large, which makes the process wastewater contain high concentration of ammonia and hydrogen peroxide wastewater. [0003] At present, in the wastewater treatment process, the process method adopted is generally: ammonia water and hydrogen peroxide wastewater are discharged to the HF wastewater regulating tank for mixing, then pass through the defluoridation reaction tank, and then pass through the wastewater biochemical system (ANO process) for biological denitrification. The final emission standard. [0004] The common shortcoming of present this waste w...

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Problems solved by technology

[0004] The common shortcoming of present this waste water treatment process is: because the NH 3 -N is immediately stabilized into salts, and the residence time is short, the concentration of hydrogen peroxide is diluted and all ammonia nitrogen will eventually need biochemical treatment, resulting in the following results: ①The water quality of hydrogen peroxide wastewater in the HF wastewater adjustment tank is acidic, resulting in H 2 o 2 Decomposition is slow, and chemicals and catalysts need to be added to decompose, otherwise hydrogen peroxide enters the biochemical system to consume carbon sources and kill nitrification and denitrification bacteria. ②Ammonia water can be stabilized in the acidic adjustment tank to become salt, and all ammonia nitrogen needs to pass through the biochemical system for nitrification and denitrification For denitrification, the biochemical system needs to be expanded and because solar wastewater has no organic wastewater, it is necessary to purchase additional methanol as a carbon source. C:N needs to reach more than 4 to stabilize ammonia nitrogen removal. Reduction potential), unit water sludge volume MLVSS, water toxins, wastewater nutrient ratio, etc. all have strong requirements, so the system operation stability is poor. ④Biological NH3-N nitrogen removal requires nitrification and denitrification, both of which produce sludge , so the amount of sludge produced is large, and regular sludge removal is required to produce biochemical sludge. ⑤When the concentration of ammonia water is high, chemical ammonia removal is required in biochemical pretreatment, which consumes chemicals. Biochemical treatment of ammonia nitrogen requires nitrification to ensure that the total nitrogen in the effluent reaches the standard. The liquid return flow is 150-300%, the sludge return flow is 50-100%, and the energy consumption is relatively large

The above and other problems, such as control errors in the processing process, will lead to system abnormalities, which will affect the drainage of the workshop and stop production for recovery, resulting in waste of workshop capacity and seriously affecting the benefits of the workshop

At present, there is no more suitable method to solve many problems in the industry at home and abroad

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