Alga-rich trench system for farmland tail water treatment and treatment method

Abstract

The invention discloses an alga-rich trench system for farmland tail water treatment and a treatment method. The alga-rich trench system comprises an alga-rich trench, a flow pusher, a water level control gate, a draining communicating culvert pipe, an aquatic organism pond and a regulating station and is characterized in that farmland tail water discharged from farmland enters the alga-rich trench system, the flow speed of the farmland tail water is kept by the action of the flow pusher, an algal-bacterial symbiotic system in the trench purifies the tail water, the purified water enters the aquatic organism pond through the draining communicating culvert pipe for further purification, and the water processed by the trench-pond system is lifted to the farmland by the regulating station for recycling. The alga-rich trench system has the advantages that the farmland tail water is deeply purified by the trench-pond combination process, a common trench is modified into the alga-rich trench, the pollutant removing ability of the trench is increased effectively, the processed tail water is lifted back to the farmland for recycling, purposes of saving irrigation water and nitrogen and phosphorus resources, reducing the amount of drained water, reducing water environment pollution pressure, and the like are achieved.

Description

technical field [0001] The invention relates to the field of low-pollution water treatment, in particular to an algae-rich trench system and a treatment method for farmland tail water treatment. Background technique [0002] High input and high output are the main characteristics of my country's planting industry at present, which leads to high-intensity nitrogen and phosphorus emissions. Taking the Taihu Lake Basin as an example, the average annual consumption of farmland fertilizers is 570-600kg / hm2 of nitrogen fertilizers and 79.5-99kg / hm2 of phosphate fertilizers, which greatly exceeds the range of reasonable application rates, and the average utilization rate of chemical fertilizers is only 30%-35%. Excessive fertilizer input increases the background value of nitrogen and phosphorus in soil, increasing the risk and amount of nitrogen and phosphorus loss to water bodies. Unreasonable fertilization and irrigation and drainage patterns cause farmland tailwater to exceed t...

AI Technical Summary

Problems solved by technology

[0008] However, the above-mentioned patented technology focuses on the treatment and purification of farmland tail water, and the pollutant removal capacity of ditches needs to be further improved, and at the same time, the recycling of treated tail water is not considered.

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