Method for recovering ammonia nitrogen in livestock and poultry breeding wastewater

Abstract

The invention relates to the field of wastewater treatment, and particularly discloses a method for recovering ammonia nitrogen in livestock and poultry breeding wastewater. An exchanger and an ammonia nitrogen analysis solution in step c), step d) and step e) in the method can sufficiently recover most of ammonia nitrogen in the livestock and poultry breeding wastewater, and the ammonia nitrogen recovered in the exchanger and the ammonia nitrogen analysis solution can be produced into products as needed, such as ammonium chloride, ammonium sulfate and the like, and can also be used as a nitrogen source for fermentation of agricultural straws. Moreover, after most of the ammonia nitrogen in the livestock and poultry breeding wastewater is recovered, a ratio of C/N in the livestock and poultry breeding wastewater is increased, so as to facilitate biochemical treatment of the livestock and poultry breeding wastewater in a later period, so that the treatment cost of the livestock and poultry breeding wastewater can be effectively reduced. The scheme can reduce the recovery cost of the ammonia nitrogen in the livestock and poultry breeding wastewater.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a method for recovering ammonia nitrogen in livestock and poultry breeding wastewater. Background technique [0002] In the treatment of livestock and poultry breeding wastewater, after the treatment of dry-wet, solid-liquid, and biogas tanks, the COD, ammonia nitrogen, and suspended solids in the wastewater have been significantly reduced, thus greatly reducing the processing load of the subsequent process. However, in the existing wastewater treatment methods for livestock and poultry breeding, the post-processes all adopt biochemical treatment, and its fundamental essence is to remove nitrogen and phosphorus. However, livestock and poultry breeding wastewater is a typical wastewater with a low BOD / N ratio, and its ratio is generally between 2:1 and 3:1, sometimes close to 1:1. According to the basic requirements of the current sewage treatment biochemical sectio...

AI Technical Summary

Problems solved by technology

However, livestock and poultry breeding wastewater is a typical wastewater with a low BOD / N ratio, and its ratio is generally between 2:1 and 3:1, sometimes close to 1:1. According to the basic requirements of the current sewage treatment biochemical section C:N:P should be controlled at 100:5:1. From the perspective of biochemical reactions, to improve the denitrification effect, the BOD / N ratio should be controlled at least above 4. To have a good phosphorus removal effect, BOD / N P is at least 15, which leads to the imbalance of nutrient ratio in the process of biochemical treatment of wastewater, so for the treatment of livestock and poultry wastewater, many treatment effects are not ideal, the key is that the biochemical treatment effect is not good

[0003] In response to this problem, many new technologies have emerged, such as: increasing the C / N ratio by adding carbon sources to improve the treatment effect of the biochemical section; short-range nitrification and denitrification biological nitrogen removal technology, anammox biological nitrogen removal technology, synchronous nitrification Nitrification biological denitrification technology, etc., plus carbon source, there is a problem of carbon source, which directly affects the cost of wastewater treatment, while many other technologies are still in the research stage, or only a small part of them are in use, and their control requirements and operators The skill requirements and automation requirements are relatively good, and some technologies take a long time to start up. It takes at least three months when the control conditions are met, and the load shock resistance is relatively low.

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