The excessive propagation of algae has a great impact on the water production of waterworks. Including: algae will block the filter, consume more liquid chlorine, and improve filtration. Algae and nutrients entering the pipe network of the filter serve as the substrate for microbial growth and reproduction The bacteria in the starting and distribution pipe network regenerate and grow, causing secondary pollution. The secretion and degradation products of algae contain toxic substances such as tetrachloroethylene and dimethyl disulfide, which can cause human and animal poisoning, and the musty and fishy smell produced by them can also make people unacceptable when drinking 。 The massive propagation of algae brings great difficulties to the subsequent chlorination disinfection of the water purification plant. The sensory quality of raw water becomes worse, which has a great impact on the conventional water treatment process, seriously reducing the effect of water treatment, increasing the cost of water treatment, and affecting the normal Production run. Algae will also multiply in a large number in the filter tank, which will cause the filter material layer to be blocked, shorten the filtration cycle, reduce the water yield, increase the flushing water volume and affect the effluent quality. Nowadays, people have higher and higher requirements for the quality of drinking water. Conventional water treatment in water plants The production requirements of should also be greatly improved, especially the removal of algae. We should focus on the algae removal process to reduce the algae content in the water.
Activated carbon The adsorption method uses the adsorption property of activated carbon to remove algae. We all know that activated carbon is a very good adsorbent. It has dual properties of physical adsorption and chemical adsorption, especially can adsorb toxic gases and impurities in water 。 Therefore, using activated carbon to absorb algal organisms can not only remove the organisms themselves, but also absorb toxic gases in water.
The adsorption of algal toxins on activated carbons made from different materials is obviously different. Activated carbon made of wood, coal, peat and nacre is used for adsorption Mil The initial concentration in core water and river water is 2.5mg/L Of Micnxvsti one LR It is found that wood charcoal is an effective adsorbent with an adsorption capacity of 220-280ug/mg 。 The reason is that wood charcoal has large mesopore volume, and Micmysrin-LR The relative molecular mass of is 994, It is easily adsorbed by mesopore. Another factor affecting the adsorption of algal toxins by activated carbon is dissolved organic matter.
Activated carbon adsorption is one of the effective processes to remove algal toxins, but the desorption of algal toxins in activated carbon is still lack of research. The removal of algal toxins by activated carbon with biofilm on its surface and its mechanism also need to be further studied.
