Method for processing algae-enriching water and application system thereof

Abstract

The invention relates to a method for processing algae-enriching water. The method comprises the following steps of: a) obtaining algae liquid after thoroughly decomposing and hydrolyzing; b) carrying out anaerobic digestion on the algae liquid; c) carrying out anaerobic-aerobic processing on the algae liquid after the anaerobic digestion; and d) discharging the algae liquid subjected to the anaerobic-aerobic processing after nitrogen and phosphorus are absorbed by water plant. The invention also relates to an application system of the method for processing the algae-enriching water. According to the method and the system which are disclosed by the invention, the difficult problem of processing a large amount of cyanobacteria bloom in Lake Taihu can be effectively solved, organic pollutants and nitrogen and phosphorus nutrients in the algae-enriching water can be effectively removed, the purposes of biogas production by blue green algae organic biomass and the agriculture resource utilization of the nitrogen and the phosphorus can be realized while the lake water quality is directly improved, and the processed tail water can reach to a level A emission standard related to the national standard. Compared with the regular algae-enriching water gas floatation thickening method, the method disclosed by the invention has the advantages of having a good removing effect, being simple in operation and management and good in energy saving effect, greatly reducing the processing cost of the blue green algae, and having excellent social benefit and economic benefit.

Description

technical field [0001] The invention belongs to a treatment method for lake pollution, in particular to a treatment method for algae-rich water in a lake and an application system thereof. Background technique [0002] It is an indispensable means to remove algae in the local area where a large number of algae blooms accumulate. Timely salvage and collection of algae can reduce the biomass of algae in a short period of time, reduce the level of nitrogen and phosphorus nutrients in the endogenous water body, and the content of algae toxins. It can speed up the ecological restoration of water bodies and is considered to be a safe and effective method. At present, the salvage of cyanobacteria mainly has two methods: fixed algae water separation station and algae fishing boat. The survey results show that there are currently more than 70 cyanobacteria salvage points and 8 fixed algae water separation stations around Taihu Lake. Due to limited capacity, only about 50% of the alg...

AI Technical Summary

Problems solved by technology

As time accumulates, the accumulated algae-rich water becomes old algae, which not only deteriorates the water quality, rots and smells and affects the surrounding environment of the water body, but also releases algal toxins; the nitrogen, phosphorus, and algal toxins produced by decomposition will also be washed away by rainwater, Flow into Taihu Lake again through surface runoff or leaching, causing secondary pollution

This not only fails to fundamentally solve the problem of algae-rich water in Taihu Lake, but also causes the pollution of the shore base of Taihu Lake due to the accumulation of cyanobacteria on the shore, which has a great impact on the local water environment and air quality, and aggravates the water environment in Taihu Lake. deterioration of quality

[0003] At present, the commonly used cyanobacteria salvage and treatment methods are manual salvage, algae-enriched water salvaged by algae boats, air flotation concentration and dehydration by pressure filtration. This method has problems of economic and technical rationality.

The cost of algae-enriched water treatment is relatively high, and it is difficult to avoid the loss of some nitrogen and phosphorus in the process of filter press treatment, and the treatment is not perfect

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