VVNA: Overcoming Monochloramine Disinfection Hurdles, Precise Ratio Control for Water Supply Safety

In China, water treatment plants adopting the chloramine disinfection process are commonly confronted with a thorny challenge: excessive ammonia dosing leads to an abnormally low chlorine-to-ammonia ratio. Though seemingly a simple issue, it triggers a series of knock-on effects for water plants, seriously compromising the quality of water supply and operational efficiency.

The free ammonia generated by excessive dosing serves as a breeding ground for biofilms in the water distribution network. These biofilms consume a large amount of residual chlorine in the water, forcing water plants to increase chlorine dosage. However, higher chlorine dosage elevates the risk of disinfection by-product formation, laying hidden dangers for water quality safety. More notably, nitrifying bacteria in the water will convert ammonia into nitrite, a substance detrimental to human health. This incomplete nitrification process further degrades water quality. Meanwhile, the presence of excessive free ammonia also accelerates the reproduction of red worms, which frequently results in user complaints and has long been a persistent headache for water plant operations.

How to accurately and stably control the chloramine dosing ratio? And how to effectively and cost-efficiently address this long-standing problem plaguing water treatment plants while reducing excessive ammonia dosing? These have become the common research directions for the industry.

With years of dedicated experience in the water quality testing field, VVNA Water Quality Analysis Instruments (Shenzhen) Co., Ltd. has always been guided by the principle of "addressing industry pain points through technological innovation". Targeting this specific challenge faced by China's water treatment plants, the company has launched a proprietary technology and corresponding products capable of simultaneously detecting monochloramine and free ammonia in finished water. By analyzing these two key indicators, water plants can precisely adjust the chloramine dosing ratio and scientifically control the ammonia dosage, thus breaking the vicious cycle of "excessive ammonia dosing → a cascade of problems" from the source.

The practical application of this solution in a large domestic water supply company has delivered impressive results: excessive ammonia dosing has been completely eliminated. Not only has the ammonia gas dosage been significantly reduced, but the effective inhibition of biofilms in the distribution network has also led to a remarkable decrease in residual chlorine consumption. Over the course of one year, the chlorine dosage was reduced by 550 tons, resulting in a total cost saving of more than 2.5 million yuan. More importantly, the concentration of nitrite in the distribution network has dropped significantly, complaints about red worms have almost vanished, and the health quality of the water supply has been substantially improved.

VVNA's monochloramine/free ammonia detection technology has enabled domestic water supply enterprises to achieve precise control of the chloramine ratio, providing a reliable basis for the scientific management of ammonia dosing. While significantly enhancing water supply safety and quality standards, it also optimizes operational costs, achieving a dual improvement in both economic and social benefits. Particularly noteworthy is that this technology offers a practical and feasible application solution for monochloramine, a key routine indicator specified in the National Drinking Water Health Standard (GB 5749-2006), effectively filling the long-standing gap in the industrial application of this indicator.

With the rapid development of China's industrial and agricultural economy, water pollution incidents occur from time to time, posing severe challenges to traditional disinfection processes. The water supply industry shoulders the crucial responsibility of safeguarding the drinking water safety of hundreds of millions of households. How to deliver reliable tap water efficiently and cost-effectively is the unremitting pursuit of every water treatment plant. In this mission-driven journey, VVNA is committed to joining hands with domestic water supply enterprises, leveraging its profound technological accumulation, rich experience in water quality testing, and strong sense of social responsibility, to jointly safeguard the "drinking water safety on the tip of the tongue".

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