Urine sewage nitrogen and phosphorus recovery and purification treatment device and method

Abstract

The invention provides a urine sewage nitrogen and phosphorus recovery and purification treatment device and method, and belongs to the technical field of sewage treatment, the urine sewage nitrogen and phosphorus recovery and purification treatment device comprises a hydrolysis tank for collecting urine, the hydrolysis tank is communicated with a reduced pressure distillation tower, the reduced pressure distillation tower is communicated with a dissolving tank and a sedimentation tank, the dissolving tank is communicated with a vacuum pump, and the sedimentation tank is communicated with an MBR reactor. The hydrolysis pool is used for collecting, storing and hydrolyzing urine resources; the reduced pressure distillation tower is used for realizing separation of nitrogen resources in the hydrolyzed urine, and recycling of nitrogen and phosphorus resources is completed by connecting the sedimentation tank and the dissolving tank; and the MBR is used for removing residual nitrogen and organic matters after the urine resources are recycled. According to the invention, the nitrogen load of a downstream sewage treatment plant is reduced, the carbon-nitrogen ratio is increased, and the treatment cost is saved; rapid and efficient ammonia separation is realized, and efficient recovery of ammonia gas is realized by virtue of a sulfuric acid solution; the heat loss is reduced, and the energy consumption is reduced; the recovered ammonium sulfate crystal and magnesium ammonium phosphate crystal have the advantages of few impurities, single component and higher purity.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a device and method for recycling and purifying urine sewage nitrogen and phosphorus. Background technique [0002] With the gradual emergence of the disadvantages of traditional sewage treatment facilities (high cost, high energy consumption, low efficiency, difficulty in maintaining balance of payments, etc.), and the rapid increase in population, the excessive use of chemical fertilizers has led to the depletion of non-renewable resources and the demand for renewable agricultural fertilizers. In urgent need, scientists have proposed the concept of "source separation", which is to consider the separation of human excrement from the source to the recovery, concentration and recycling of plant nutrients (using it as crop fertilizer) as a whole cycle, and complete the transformation from "human The concept of "excrement from buildings to sewage treatment plants" to "food ...

AI Technical Summary

Problems solved by technology

This method can efficiently recover phosphorus in urine, with a recovery rate of over 95%, but the recovery rate of nitrogen is very low, only about 5%.

In addition, because the COD:N (1.2:1) of urine itself is very low, it cannot meet the requirements of COD:N (5:1) required for biological denitrification, which makes it difficult to remove pollutants in urine after resource recovery.

In summary, the main defect of the existing technology is that it cannot effectively remove / recover the nitrogen in urine, which leads to the difficulty of subsequent biological denitrification, which in turn affects the operating cost of domestic sewage treatment facilities, resulting in high cost, difficult treatment, and energy consumption. High, low efficiency, not sustainable

Images