E-mail: michael@shboqu.com   |   Expert in Water Quality Measurement and Water Treatment Project

What impact does high temperature have on the water environment?

by:BOQU     2023-03-19
In the summer of 2022, the high temperature will continue to set new records, and many places in my country have issued high temperature warnings. This high-temperature day also caused many wading problems, and the quality of the water environment was once again tested. Therefore, relevant departments need to pay attention, because too high temperature will affect the water quality of the river! What impact will the continuous high temperature weather have on the quality of the water environment? Temperature is one of the important factors affecting aquatic ecosystems. Sustained high temperature will change the physical and chemical properties of water bodies, thus affecting the quality of aquatic ecological environment. Its overall performance is the deterioration of water quality or even black odor, algae outbreak, fish and shrimp death, and water body odor. The main reasons are as follows: 1. Continuous high temperature will reduce the self-purification ability of water. Continuous high temperature will lead to an increase in evaporation, coupled with a decrease in precipitation, resulting in insufficient water capacity and hydrodynamic force, which will weaken the self-purification ability of water. 2. Sustained high temperature will reduce the concentration of dissolved oxygen in water, resulting in a decrease in the solubility of oxygen in the air in water. At the same time, the oxygen consumption process of the river sediment and water body will be accelerated at high temperature, resulting in a rapid decrease in the concentration of dissolved oxygen in the water body. At the same time, high temperature is conducive to promoting the degradation of organic matter, resulting in a decrease in dissolved oxygen and an increase in the concentration of inorganic nutrients, and accelerates the release of nitrogen and phosphorus pollutants in sediments, thereby intensifying the degree of eutrophication in water bodies. 3. The continuous development of high temperature will destroy the ecological management system of the aquatic environment. The main reason is that the sensitivity analysis of aquatic plant organisms to temperature in my country is usually higher than that of other terrestrial organisms. High temperature is prone to accelerate the succession or destruction of aquatic ecosystems. In eutrophic water bodies, the growth and change speed of cyanobacteria also accelerates with the increase of water temperature, and cyanobacteria blooms are very easy to break out in high temperature seasons. A large number of studies on the outbreak and death of cyanobacteria will further reduce the consumption of dissolved oxygen in water, release odors, and produce toxic and harmful social substances such as cyanotoxins, which will lead to the death of aquatic animals such as fish and shrimp, and may lead to rapid deterioration of urban river water quality and even black and odor. Cause damage to the entire aquatic ecological protection system of the enterprise. In addition, under the condition of high temperature and strong sunlight, it is also conducive to the rapid and healthy growth of duckweed. A large number of duckweed covers the water surface, which will directly lead to the death and decay of various aquatic organisms and aggravate the eutrophication of the water body. The death and decay of a large number of duckweed will also consume and dissolve, resulting in an increase in the concentration of organic matter, nitrogen, phosphorus and other pollutants in the water body, deteriorating the water quality. High temperature and short-term heavy rain in summer can easily lead to deterioration of water quality. There are many thunderstorms in summer, and short-term heavy rain will cause a large amount of non-point source pollutants to enter the river with runoff. The rapid reduction of oxygen leads to the deterioration of water quality and the death of fish and shrimp. What measures are in place to deal with the above problems? 1. Implement ecological water replenishment, improve hydrodynamic conditions, and adopt methods such as reclaimed water replenishment, river diversion, and reservoir discharge to replenish water. Actively expand ecological water sources and increase the amount of ecological water. Through the scientific dispatch of sluices, inland river sluices, and pumping stations along the Yangtze River, the river water body can be precisely regulated, the fluidity of the plain river network can be enhanced, and the hydrodynamic conditions of the river can be improved. In some rivers that do not have the conditions for water replenishment and regulation, temporary water pumps, surge machines and plug-flow aeration devices can be installed to increase the fluidity of the water body. 2. Strengthen the oxygenation and aeration of urban rivers to improve the self-purification treatment capacity of water bodies in China. Use facilities such as fountain aerators, surge machines, or micro-nano aeration equipment to restore water body information outside the range that does not affect the online monitoring of cross-section water quality. Oxygen, increase the time of aeration in high temperature days, promote the mixing of upper and lower water bodies, and increase the disturbance of local water bodies, increase the content of dissolved oxygen in the water, inhibit the release of sediment nitrogen and phosphorus, and prevent the occurrence of black and odorous water bodies Occurrence, recovery and enhancement of the activity of aerobic microorganisms in China's water bodies, so that the degradation of polluting substances in water bodies can be purified, thereby improving the water quality of rural rivers. 3. Strengthen the control of algae, enhance the sense of water body through physical methods, use water disturbance, change the hydrodynamic conditions, and reduce the occurrence and accumulation of cyanobacteria. Biological floating island technology and aquatic animal technology can also inhibit the growth of cyanobacteria. At the same time, river cleaning should be strengthened, and the frequency of cleaning cyanobacteria, duckweed, water hyacinth, etc. in the river should be increased to avoid reunion and affect the senses of the water body. If necessary, special algicides should be used for rivers with cyanobacteria outbreaks. Four. Strengthen the supervision and strict control of river pollution, strengthen the investigation, supervision and management of river pollution sources, drainage facilities and outlets, actively promote the closure of major pollution source pipelines, the renovation of drainage facilities and the regulation of river mouths, and effectively reduce the discharge of river pollutants. Give full play to the enthusiasm of river chiefs, network members and people at all levels, increase river inspections, and find problems in a timely manner. At the same time, local governments and relevant departments should strengthen the monitoring of river water quality and algae, and conduct analysis and early warning of water quality changes in high temperature seasons.
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