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

A livestock and poultry breeding wastewater and treatment process technology, applied in the field of low COD and high ammonia nitrogen livestock and poultry breeding wastewater treatment process, can solve the problems of difficult wastewater treatment, difficulty in meeting discharge standards, high content of suspended solids, etc., and achieve ideal actual operation effect, The effect of relatively low investment and operating costs and short process routes

Inactive Publication Date: 2017-07-25
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 biochemic

Method used

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

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Experimental program
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Example Embodiment

[0028] Example one

[0029] This embodiment provides a process for treating livestock and poultry farming wastewater with low COD and high ammonia nitrogen. Based on the process, the adopted devices include a sieving tank, a primary sedimentation tank, a regulating tank, a dosing reaction tank, a coagulation sedimentation tank, and Ammonia nitrogen stripping tower, second-stage biological contact oxidation tank, second settling tank, sludge tank.

[0030] Specifically, the water outlet pipe of the sieve filter tank is connected with the water inlet pipe of the primary sedimentation tank, the inner bottom of the primary sedimentation tank is connected to the inlet of the sludge self-priming pump through a sewage pipe, and the water outlet pipe of the primary sedimentation tank is connected to the adjustment tank A lift pump is provided at the bottom of the regulating tank, and the lift pump is connected with the water intake pipe of the dosing reaction tank. The lift pump is fixed a...

Example Embodiment

[0037] Example two

[0038] In this embodiment, the low COD high ammonia nitrogen livestock and poultry breeding wastewater is treated, and the process includes the following steps:

[0039] (1) The livestock and poultry farming wastewater with COD content of 350~450mg / L, ammonia nitrogen content of 400~500mg / L, and suspended solids content of 1000~2000mg / L is first passed through a step-by-step filter tank composed of multi-level screens. To remove large particles, the sieve filter tank is provided with a 2mm aperture stainless steel fine mesh, 1mm aperture stainless steel fine mesh, and 1mm aperture stainless steel fine mesh in sequence along the water flow direction. The whole process has no power and no energy consumption loss. Clean up the dung regularly.

[0040] The effluent of the step-by-step screen filter enters the primary sedimentation tank. The tank is equipped with an inclined pipe, which has high sedimentation efficiency and can remove most of the suspended solids und...

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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...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/20C02F101/16
CPCC02F1/001C02F1/52C02F1/66C02F3/02C02F9/00C02F2001/007C02F2101/16C02F2103/20C02F2301/08
Inventor 戴捷胡耀笛刘会应刘松吴先威易俊
Owner YANGTZE UNIVERSITY
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