Method and system for carrying out ecological treatment on breeding wastewater from pig farms

Abstract

The invention discloses a method and a system for carrying out ecological treatment on breeding wastewater from pig farms. The method comprises the following steps: A. carrying out solid-liquid separation; B. building a first-level front-end regulation and biomass purification treatment pond for treating the wastewater; C. building a second-level front-end regulation and biomass purification treatment pond for treating the wastewater; D. building a third-level front-end regulation and biomass purification treatment pond for treating the wastewater; E. building a first-level ecological wetlandfor treating the wastewater; F. building a second-level ecological wetland for treating the wastewater; G. building a third-level ecological wetland for treating the wastewater; H. building fourth-level ecological wetland for treating the wastewater; I. building a fifth-level ecological wetland for treating the wastewater; J. building a sixth-level ecological wetland for treating the wastewater; K. building a seventh-level ecological wetland for treating the wastewater; L. building an eighth-level ecological wetland for treating the wastewater; M. building an end enhanced treatment pond for treating the wastewater. The system consists of solid-liquid separation equipment, the first-level, second-level and third-level front-end regulation and biomass purification treatment ponds, the first-level, second-level and third-level ecological wetlands, the fourth-level ecological wetland, the fifth-level, sixth-level, seventh-level and eighth-level ecological wetlands, and the end enhanced treatment pond. The method is easy to implement, simple and convenient to operate and low in engineering construction cost; after the breeding wastewater is treated by the system, the contents of main pollutants such as chemical oxygen demand (COD), ammonia nitrogen, total nitrogen, phosphate and total phosphorus in the breeding wastewater are stably controlled to be within a certain range.

Description

technical field [0001] The present invention relates to the field of agricultural environment, and more specifically relates to a method for ecological treatment of pig farm wastewater, and also relates to a system for ecological treatment of pig farm wastewater, especially suitable for the treatment of pollutants in subtropical large-scale pig farm wastewater. Achieve emission standards. Background technique [0002] In recent years, with the rapid development of the economy, the eutrophication of rivers and lakes has gradually become an important ecological environment problem facing our country. For example, several large lakes (Taihu Lake, etc.) Rivers, etc.) and streams are often silted up by water hyacinth, blocking river courses and affecting the normal reproduction and growth of aquatic organisms such as fish. The treatment of water eutrophication often takes engineering measures (removing lake silt, carrying out domestic sewage treatment, etc.); land treatment (pur...

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Problems solved by technology

[0003] The existing aquaculture wastewater treatment method is after the anaerobic fermentation of the biogas tank, the biogas slurry industrial treatment generally follows the process of urban domestic sewage treatment (flocculation, anaerobic, aeration, biofilm cultivation of active sludge for digestion and denitrification), The treatment project needs to consume a lot of electric energy (aeration device, water body lifting equipment, stirring device and blowing off device, etc.), needs to add a large amount of chemical flocculants (such as polyaluminum chloride, etc.), requires professional maintenance and management, and produces a large amount of sludge. After retreatment, the content of COD, nitrogen and phosphorus in the discharged water after treatment is effectively reduced, but the content of chloride ions and aluminum ions increases and causes secondary pollution to the water body

Pig farms with 3,000-6,000 live pigs in stock use industrialized treatment processes to treat aquaculture wastewater. The construction cost of the treatment equipment system is generally 3-5 million yuan, and the daily operation and maintenance costs are 800-2,000 yuan / day. Willing to build, some farms have built the treatment facilities but they have been idle for a long time (in order to save about 1,000 yuan / day operation and maintenance costs)

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