Low-COD (Chemical Oxygen Demand) high-ammonia-nitrogen livestock wastewater treatment process

Abstract

The invention discloses a low-COD (Chemical Oxygen Demand) high-ammonia-nitrogen livestock wastewater treatment process, and belongs to the field of biological sewage treatment. The treatment process is divided into a pretreatment stage and a biochemical treatment stage specific to the characteristics of livestock wastewater quality. The treatment process comprises the following steps: firstly, removing large-particle suspended matters through a gradual screening tank and a primary sedimentation tank; homogenizing water quality and water amount in an adjusting tank, and adding wastewater into a dosing reaction tank; making the wastewater flow into a coagulating-precipitating tank in order to remove most suspended matters; added a NaOH solution into effluent for adjusting pH, introducing the effluent into an ammonia-nitrogen blow-off tower, adding hydrochloric acid into the effluent for adjusting pH to neutral, entering a secondary bio-contact oxidation process to remove most COD and deepen the ammonia-nitrogen removing effect; lastly, making the effluent flow through a secondary sedimentation tank to discharge the effluent up to standard. The low-COD high-ammonia-nitrogen livestock wastewater treatment process has a short route and high efficiency, sewage can be treated up to standard under the condition that a C / N ratio is close to 1 to 1, the problem that the effluent wastewater is difficult to reach standard is solved, and the aim of recycling the effluent is fulfilled.

Description

technical field [0001] The invention relates to the field of biological sewage treatment, in particular to a process for treating livestock and poultry breeding wastewater with low COD and high ammonia nitrogen. Background technique [0002] Nowadays, with the demolition of pig farms all over the country, the breeding industry is facing a difficult environmental protection revolution, and the pollution of the breeding industry cannot be avoided. Taking pig wastewater as an example, according to the design and on-site commissioning experience of our research group, it is found that there is a kind of low-COD and high-ammonia-nitrogen livestock and poultry wastewater that is extremely difficult to meet the discharge standard with the traditional process, and the C / N ratio is close to 1:1. The process currently used in the market for this type of wastewater is still a traditional biochemical process, which directly leads to the problem of large investment but difficulty in reac...

AI Technical Summary

Problems solved by technology

Taking pig wastewater as an example, according to the design and on-site commissioning experience of our research group, it is found that there is a kind of low-COD and high-ammonia-nitrogen livestock and poultry wastewater that is extremely difficult to meet the discharge standard with the traditional process, and the C / N ratio is close to 1:1. The process currently used in the market for this type of wastewater is still a traditional biochemical process, which directly leads to the problem of large investment but difficulty in reaching the standard

Through analysis, although this type of wastewater has less feces and slag, the content of suspended solids is still high. The combination of various factors makes the treatment of this type of wastewater difficult. At the same time, investment and operating costs and other factors need to be considered comprehensively in the process design.

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