Source and Analysis of Microorganisms in Circulating Water

Microorganisms in circulating cooling water come from two aspects. One is that the cooling tower needs to introduce a large amount of air during the evaporation process of water, and microorganisms are also brought into the cooling water with the air. Second, there are more or less microorganisms in the supplementary water of the cooling water system, and these microorganisms also enter the cooling water with the supplementary water system. Under the irradiation of sunlight, algae will photosynthesize with carbon sources such as carbon dioxide and bicarbonate in water, absorb carbon as nutrition and release oxygen. Therefore, when algae proliferate in large numbers, the dissolved oxygen content in water will increase, which is beneficial to oxygen The depolarization effect of the corrosion process is thus accelerated. The massive reproduction of microorganisms in the circulating water system will turn the circulating water black, produce stench, and pollute the environment. At the same time, a large amount of slime will be formed to reduce the cooling efficiency of the cooling tower, and the wood will deteriorate and rot. The slime deposits in the heat exchanger, which reduces the heat transfer efficiency and increases the head loss. The slime deposited on the metal surface will cause serious corrosion under the scale. At the same time, it also isolates the effect of the corrosion and scale inhibitor on the metal, so Chemicals cannot exert their due corrosion and scale inhibition performance. In addition to accelerating under-deposit corrosion, microbial slime also directly corrodes metals with biological secretions during the metabolic process of some bacteria. All these problems lead to the long-term and safe operation of the circulating water system, affecting production and causing serious economic losses. Therefore, the hazards of microorganisms are as serious as the hazards of scale and corrosion to the cooling water system. It can even be said that the comparison of the three controls Microbial hazards are primary. The movement of microorganisms in circulating water can be measured by the following chemical analysis items: (1) Residual chlorine (free chlorine) When chlorinating and disinfecting, pay attention to the time and amount of residual chlorine, because when the microbial reproduction is serious, the circulating water will be consumed. The amount of chlorine is greatly increased. (2) Ammonia circulating water generally does not contain ammonia, but ammonia will also appear in the water due to the leakage of the process medium or the inhalation of ammonia in the air. Containing nitrite, the ammonia content in the water is preferably controlled below 10mg/l. (3) NO2- When ammonia and nitrite appear in the water, it is said that nitrous bacteria in the water have converted ammonia into nitrite. At this time, it will be very difficult to add chlorine to the circulating water system, and the chlorine consumption will increase. Residual chlorine is difficult to reach the target, and the NO2- content in water is best controlled at less than 1mg/l. (4) COD will increase when the microbial reproduction in the water is serious, because the mucus secreted by the bacteria increases the content of organic matter in the water, so through the analysis of the chemical oxygen demand, the trend of microbial changes in the water can be observed. COD is preferably less than 5mg/l (KMnO4 method). The harm caused by microorganisms in circulating water is very serious. If you want to take measures after the microorganisms cause harm, you will often get twice the result with half the effort and spend a lot of biocides and money. Therefore, it is necessary to comprehensively monitor the microbial situation of circulating cooling water in advance.
If you have a need for water quality monitoring device water analyzer, like , and , you need to be able to find a dependable provider who you can trust when necessary.
Deliver value to our customers by providing the most reliable and efficient products as water analyzer.
water analyzer has a very good repute over the global market.
water analyzer is receiving a great positive feedback in the market. And many of our clients are fully satisfied with it.
Shanghai Boqu Instrument Co., Ltd. affords you a suitable low price for proving our ethical considerations.