Method for removing algae and microcystin from raw water in water plant
A microcystin and raw water technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of poor water treatment effect, hysteresis of biodegradation, Low efficiency and other problems, to achieve the effect of high practicability, low price and high safety
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Embodiment 1
[0021] A method for removing algae and microcystins in raw water of a waterworks, the steps of which are:
[0022] 1) Filling film at water source 1: Place the selected carrier filler (ZH plastic suspension packing of Φ10×10~20mm) in the water source, and cultivate it in a natural state for 30 or 35 or 40 or 44 or 48 or 52 or 56 or 60 days, transferred to biofilm reactor (biofilm reactor preparation is very easy, those skilled in the art can prepare, biofilm reactor inner diameter is 300-1000mm, high 1000-2000mm), raw water operation 1 or 2 or 3d make the system stable.
[0023] 2) Biofilm reactor treatment 2: use the biofilm in the biofilm reactor (inner diameter 300-1000mm, height 1000-2000mm) to intercept algae cells and the feeding effect of micro-animals in the biofilm to remove algae in the water; Degradation by microorganisms in the membrane removes soluble microcystins. When the chlorophyll a in the raw water is 100 or 110 or 125 or 135 or 145 or 150 μg / L, and the hy...
Embodiment 2
[0032] Microcystins are intracellular toxins. The treatment technology of microcystins in water should not only consider the removal of soluble algal toxins, but more importantly, effectively remove algal cells containing algal toxins. In the above examples, after adding 22.5-45.75 μg / L MC crude extract to the raw water, the concentration of soluble MC in the effluent water is less than 1.0 μg / L, and it can be seen that the removal rate of soluble MC by the biofilm reactor can reach more than 99%. However, the effluent still contains many algae cells, so the removal rate of total toxins is only 86.3%, and the concentration of total toxins is still greater than 1.0 μg / L, which poses a certain threat to the health of drinking water. In order to improve the removal rate of Microcystis by biofilm reactor, oleic acid, which has obvious allelopathic inhibitory effect on Microcystis, was selected to enhance the treatment efficiency of biofilm reactor. The specific steps are: soak the...
Embodiment 3
[0034] There are several stages in the growth of biofilm, such as adaptation, attachment, growth, shedding, and stabilization. In order to ensure the treatment effect of the system on the raw water during the biofilm shedding stage, and to prevent the shedding biofilm from entering the subsequent treatment process, a sedimentation tank (inner diameter: 300mm height: 1000mm) and an activated carbon treatment system (inner diameter: 300mm, 1000mm high, filled with Φ2-3mm, high: 4-8mm granular activated carbon). Activated carbon is used to further treat residual pollutants and small molecular substances in the effluent water of the biofilm reactor. Under the condition that the residence time is 3 hours, the effluent treated by the activated carbon column can meet or exceed the Hygienic Standard for Drinking Water (GB5749-2006).
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