Comprehensive processing process and system for cultivation wastewater

Abstract

The invention relates to a process and a system for treating breeding wastewater comprehensively, wherein the process comprises the following steps: firstly, performing grating filtration, mixed homogenization and silt sedimentation pretreatment in a pretreatment tank; secondly, performing heating and anaerobic fermentation in an anaerobic reactor; and thirdly, treating the wastewater in a bionic pond, wherein the material liquid in a water distribution trough of the bionic pond enters a sand filter through the bottom of the water distribution trough and then is raised to a water drop step; and the material liquid flows into a pond body and flows out of the pond body after being treated by an artificial float grass belt and hydrophyte floating bodies in the pond. The process and the system have the advantages of simple process, good commonality, high treatment efficiency, low running cost, low investment cost, and simple system maintenance.

Description

【Technical field】 [0001] The invention belongs to the field of agricultural environmental protection, and relates to a comprehensive treatment method and treatment system for aquaculture wastewater in aquaculture plots. 【Background technique】 [0002] With the acceleration of the construction of new rural areas in my country and the rapid development of intensive pig farming, the large amount of wastewater generated in the process of breeding development is far from being absorbed by the land naturally, and constitutes a serious threat to the atmosphere, soil, groundwater and other receiving water bodies. Serious threat of pollution, aquaculture pollution problem has aroused the country's great attention. [0003] The aquaculture wastewater of pig farms or breeding areas mainly includes pig feces and urine sewage, housing flushing water, etc. The wastewater is rich in organic pollutants composed of carbon, nitrogen, phosphorus and sulfur, which are responsible for environment...

AI Technical Summary

Problems solved by technology

my country has carried out large-scale research and application of anaerobic fermentation technology for more than 20 years, and various anaerobic fermentation technologies have gradually matured. To consume carbon and nitrogen, after the aquaculture wastewater undergoes anaerobic fermentation, CODcr will drop from 5000 to 10000 mg / L to 500 to 800 mg / L, while the carbon to nitrogen ratio in fresh pig manure is 13:1, from the perspective of environmental protection It is not enough to rely solely on anaerobic technology for aquaculture wastewater treatment technology in pig farms or breeding areas, and there are still areas that need to be further improved

Because a single anaerobic fermentation technology can only convert a large amount of organic carbon into methane gas and carbon dioxide, which is what we call biogas, while in the wastewater after anaerobic conversion, a large amount of nitrogen and phosphorus are retained. It cannot be removed, and if it is discharged directly into farmland, groundwater or surface water, it will cause serious water eutrophication

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