Technology for treating high-nitrogen, high-carbon and high-chroma organic sewage

Abstract

The invention discloses a technology for treating high-nitrogen, high-carbon and high-chroma organic sewage. The technology comprises the following processes: organic sewage is treated successively through an anaerobic tank, a denitrification tank, a nitration tank and a secondary sedimentation tank, and finally undergoes membrane treatment to be discharged; part of sewage treated through the nitration tank undergoes internal reflux into the denitrification tank to be treated; and sludge which has undergone sedimentation separation through the secondary sedimentation tank flows into the anaerobic tank, the denitrification tank and the nitration tank, and residual sludge enters the anaerobic tank. As the residual sludge enters the anaerobic tank, the problem of low anaerobic bacteria growth rate is solved on one hand, and on the other hand, disposal problem of residual sludge is also dissolved. As there are certain requirements for calculation of volume of the denitrification tank and sectional internal reflux is carried out in the nitration tank, high-nitrogen, high-carbon and high-chroma wastewater is not limited by the condition of C / N being greater than 20, there is no need to additionally add a carbon source, cost is saved, and energy consumption is reduced. The volume of the tank is about 1 / 3 of the volume of a conventional tank. Thus, investment cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, is suitable for landfill leachate and industrial waste water, and specifically relates to a process for treating organic sewage with high nitrogen, high carbon and high chroma. Background technique [0002] With the development of my country's urbanization and the gradual improvement of people's living standards, the per capita solid waste output is also increasing, which has become one of the main factors of environmental pollution. At present, the main treatment processes of municipal solid waste include composting process, incineration process and sanitary landfill process. Among them, sanitary landfill process is characterized by its mature technology, low construction and operation costs, and convenient management. The processing capacity accounts for the total amount of waste treatment in my country more than half. Due to the influence of various processes such as anaerobic ferment...

AI Technical Summary

Problems solved by technology

[0007] 2. Large changes in water quality and quantity:

[0037] 1. Because the concentration of ammonia nitrogen is too high and the ratio of carbon to nitrogen is out of balance, the denitrification effect is unstable during operation and fluctuates from time to time

[0038] 2. Compared with municipal sewage activated sludge, leachate activated sludge has poorer properties, poor sedimentation and mud-water separation, which adds a lot of operating pressure to the back-end membrane system

[0039] 3. The process control is complicated, the energy consumption is high, and the total cost of treatment is high, which can reach 40-60 yuan / ton of water

[0040] 4. Many leachate treatment systems are not equipped with special sludge storage systems and sludge dewatering systems

[0052] 2. The cost of Fenton treatment is high and there is a lot of sludge

For example, the high chemical cost of hydrogen peroxide is also one aspect, and the cost calculated by most enterprises now does not include the increase of sludge (a large amount of sludge caused by the addition of ferrous sulfate), equipment depreciation, maintenance costs, etc.

[0053] 3. Fenton treatment is easy to return color

If the dosing amount and dosing ratio of hydrogen peroxide and ferrous sulfate are not well controlled, or the ferric iron does not precipitate, it is easy to cause the wastewater to appear yellowish or yellowish brown

[0054] 4. More difficult to control

Because the optimal ratio of hydrogen peroxide and ferrous sulfate needs to be obtained through orthogonal experiments, and is affected by the pH value of the reaction, the length of reaction time, and the degree of stirring and mixing, the ratio is difficult to control

[0055] 5. Fenton treatment is highly corrosive, and even the cement pool is corroded

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