The recirculation of urea desorption waste water leads to eutrophication of water bodies, promoting the growth of bacteria and algae
Thread Content
This post was last edited by snhf1129 on 2010-10-21 at 16:26. It is said that some factories in Xuzhou use urea decomposition waste liquid recovery systems for water treatment; this recovered liquid is then used in the jackets of gas generation boilers. The initial results were good, but it was necessary to add scale and corrosion inhibitors, and the operating costs were high. Over time, corrosion of the jacket walls occurred as well. Our factory does not employ deep hydrolysis; the urea decomposition waste liquid is sent directly to the circulating water station for use as makeup water. However, over time this leads to eutrophication of the water body, the growth of bacteria and algae, which affects the efficiency of the heat exchangers and causes corrosion. It seems that boiler water film dust removal is the only option.
Sent to the boiler for water replenishment; no abnormalities observed
How much urea capacity does the poster have? Deep hydrolysis using just the previous single tower is sufficient to keep ammonia and urea levels below 5 ppm
Several small and medium-sized urea plants in the country did not originally have deep hydrolysis units; due to funding constraints, only desorption towers were designed. As environmental regulations become increasingly strict, the discharge standards for wastewater containing ammonia nitrogen are now close to those applicable to water that has undergone advanced hydrolysis. However, due to factors such as funding constraints, these manufacturers have not adopted advanced hydrolysis methods and instead treat this type of water in other ways. As the original poster said. However, these treatment methods are not the most optimal; although the initial investment appears to be low, their operating costs are high, and the cumulative cost over a long period of time is significant. The CEOs of some factories are very good at doing cost-benefit analysis; they address the problems at their source by making larger upfront investments to fundamentally solve the issue of urea wastewater treatment, so that the water meets the standards required for reuse in boilers.
Add an algaecide to the circulating water； The wastewater contains ammonia and urea, so..............