System and process for synchronously removing nitrogen and carbon from swine wastewater

Abstract

According to the method for synchronously removing nitrogen and carbon from swine wastewater, denitrification, methanation, short-cut nitrification and anaerobic ammonia oxidation are organically combined through an EGSB-SMD and EGSB-PNA two-stage reactor, the advantages of functional bacteria in the reactor are improved to the maximum extent through the two-stage SMD-PNA system, ammonia nitrogen and organic carbon are almost completely removed, culture is easy, and the method is suitable for industrial production. The whole process is high in stability and controllability. In the EGSB-SMD, the anoxic-anaerobic structure of the granular sludge is beneficial to the synergetic symbiosis of methanogens and denitrifying bacteria, the COD removal load is higher while the removal of NO2-N and NO3-N in raw water and reflux sewage is considered, and an internal reflux device and a PNA external reflux device in the SMD dilute the influent concentration and reduce the substrate inhibition. In EGSB-PNA, an internal reflux device increases the ascending velocity and promotes the formation of granular sludge with larger volume, and soft and semi-soft combined filler in the reactor promotes the formation and tight attachment of a biological membrane, so that the biomass in the reactor is maintained, and the stable operation of a CANON process is maintained.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a system and process for synchronous denitrification and carbon removal of pig raising wastewater. Background technique [0002] my country is a large breeding country, in which the pig raising industry is generally developing in a large-scale and intensive direction, resulting in the discharge of pollutants in a relatively concentrated manner, which far exceeds the natural carrying capacity of the local environment, and will also have a negative impact on the environment. cause serious pollution. According to relevant research, the wastewater discharged from pig farming is mainly composed of pig urine (feces) and flushing wastewater from pig houses. 4 + -N450~1500mg / L, TP100~330mg / L, it can be seen that the pig farm wastewater is a high-concentration organic wastewater, and its nitrogen and phosphorus content is also seriously exceeding the standard. I...

AI Technical Summary

Problems solved by technology

However, for wastewater with high ammonia nitrogen and high organic carbon, due to the relatively insufficient nitrate content in the wastewater, the accumulation of nitrite in the reaction process is low, and it is difficult to achieve the theoretical ratio of substrates required for anaerobic ammonium oxidation (NH 4 + -N:NO 2 - -N is 1.32), and when the content of organic matter is sufficient, denitrifying bacteria tend to become the dominant species in the system, and anammox bacteria are at a disadvantage in the competition process of substrate nitrite, resulting in the negative impact of anammox reaction inhibition

Secondly, the optimal coupling parameters are unknown, and the denitrification performance of the coupling process is still unstable

Again, too high concentration of Do (dissolved oxygen) will inhibit the activity of denitrifying bacteria and anammox bacteria, and the coupling efficiency will be affected

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