Discussion on the final treatment process for wastewater from fertilizer plants
Thread Content
For the comprehensive wastewater from nitrogen fertilizer enterprises, which process technology is cost-effective, stable in operation, and easy to manage? As far as I know, some companies in the nitrogen fertilizer industry currently use a two-end A/O treatment process, such as Yankuang Yishan Fertilizer and Lunan Fertilizer Factory ； Some companies use the MBR treatment process, such as Tianji ； Some use the CASS process, while there is also the A/SBR process (a short-nitration denitrification process) developed by Xuzhou Water Treatment Institute; this process is currently in operation at Deqilong Fertilizer Factory in Shandong. Which of these processes is most suitable for treating high-ammonia-nitrogen wastewater in the nitrogen fertilizer industry, and which one offers the most stable operation with relatively lower investment costs? I hope everyone will actively participate in the discussion
Actually, any of these processing methods will work, so why do different manufacturers choose different methods? This is due to the different requirements regarding the quality of raw water and treated water from various manufacturers; hence, as stated in the design manuals, the treatment processes used vary when basic parameters such as different water quality indicators and environmental requirements change. Additionally, this is related to factors such as treatment costs, local water environment regulations, whether reuse is required, and the frequency of leaks in the production process. Therefore, it cannot be said that one particular process is suitable for all situations. Whether it is the A/O process, MBR process, SBR process, or CASS process, all of them can be used for nitrogen removal; however, their efficiency in this regard varies. Therefore, it is best to select a treatment process suitable for a particular plant based on the quality of the wastewater entering that plant.
This post was last edited by tjsong on 2009-7-22 at 18:04. Definitely, the investment for MBR is relatively high. We use A/O contact oxidation, which enables the ammonia nitrogen level to drop from 300 to below 10. The two systems at Anhui Linquan Chemical and Anhui Quansheng Chemical are now operating stably. If you are interested, please contact us: hongjihb@126.com
Upstairs, can A/O contact oxidation reduce ammonia nitrogen levels from 300 to 10? ? I’m a bit skeptical. Could you explain it in detail? As far as I know, ammonia nitrogen levels above 200 mg/l can lead to ammonia poisoning. Isn’t it ineffective to use biological treatment methods for wastewater with high concentrations of ammonia nitrogen? And generally, sludge discharge is not implemented in A/O systems, right? Biochemical sludge with a sludge age of over 25 days has a rather poor efficiency in removing ammonia nitrogen, right?
This isn’t something that can be resolved just by discussing it; a specialized design firm must be hired, otherwise it won’t be possible to handle it
I think MBR is more suitable
I agree with the opinion from the second floor; it would be best if the poster could mention the quality of the water. Our company also has projects related to wastewater treatment, including COD levels in wastewater