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A process for recycling municipal secondary effluent water to boiler water in power plants

A technology for secondary effluent and boiler water, applied in water/sewage treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc. Consumption and economic cost, prolong service life, save energy

Active Publication Date: 2020-12-08
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method regulates the short-range denitrification process by utilizing the difference in physiological and biochemical conditions between the chemoautotrophic bacteria AOB and the nitrite nitrogen oxidizing bacteria NOB, which oxidize ammonia nitrogen into nitrogen oxides. , pH, temperature, oxygen concentration and other environmental factors of organic matter are regulated, so that the growth rate of NOB is significantly lower than that of AOB, and NOB is washed out with water gradually to achieve stable accumulation of nitrite nitrogen; in actual operation Substrate concentration, pH, temperature process regulation is complicated, and it is difficult to solve the problem of insufficient carbon source

Method used

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  • A process for recycling municipal secondary effluent water to boiler water in power plants
  • A process for recycling municipal secondary effluent water to boiler water in power plants
  • A process for recycling municipal secondary effluent water to boiler water in power plants

Examples

Experimental program
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Effect test

Embodiment 1

[0035] 1) The urban effluent from the secondary treatment of the urban sewage treatment plant enters the aerobic denitrification biological filter.

[0036]The urban effluent from the secondary treatment of the urban sewage treatment plant sent from the water inlet pipe (see Table 1 for the influent water quality) directly enters the aerobic denitrification biological filter, and the urban effluent from the secondary treatment of the urban sewage treatment plant is used as the water to be treated According to the content of the material in the water to be treated, 8mg / L nitrous acid and 80mg / L glucose are added when entering, and the nitrite contained in it is used as the electron acceptor, and the glucose is used as the carbon source to control the nitrification in the nitrosation stage. Denitrification and denitrification are carried out under aerobic conditions. The water to be treated enters the 0.5m supporting layer made of pebbles through the water distribution system, a...

Embodiment 2

[0052] (1) The urban effluent from the secondary treatment of the urban sewage treatment plant enters the aerobic denitrification biological filter.

[0053] The urban effluent from the secondary treatment of the urban sewage treatment plant sent from the water inlet pipe (see Table 3 for the influent water quality) directly enters the aerobic denitrification biological filter, and the urban effluent from the secondary treatment of the urban sewage treatment plant is used as the water to be treated According to the content of the material in the water to be treated, 10mg / L nitrous acid and 60mg / L glucose are added at the same time, and the nitrite contained in it is used as the electron acceptor, and the glucose is used as the carbon source to control the nitrification in the nitrosation stage. Denitrification under aerobic conditions. Enter the 0.5m supporting layer made of pebbles through the water distribution system, and then flow through the spherical lightweight porous b...

Embodiment 3

[0070] (1) The urban effluent from the secondary treatment of the urban sewage treatment plant enters the aerobic denitrification biological filter.

[0071] The urban effluent from the secondary treatment of the urban sewage treatment plant sent from the water inlet pipe (see Table 5 for the influent water quality) directly enters the aerobic denitrification biological filter, and the urban effluent from the secondary treatment of the urban sewage treatment plant is used as the water to be treated According to the content of the material in the water to be treated, 13mg / L nitrous acid and 40mg / L glucose are added at the same time, and the nitrite contained in it is used as the electron acceptor, and the glucose is used as the carbon source to control the nitrification in the nitrosation stage. Denitrification under aerobic conditions. Enter the 0.5m supporting layer made of pebbles through the water distribution system, and then flow through the spherical lightweight porous b...

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Abstract

The invention discloses a process for recycling a municipal secondary effluent into boiler water of a power plant. The process comprises the following steps: firstly treating by using an aerobic denitrification biofilter: taking the secondary treatment city effluent from a municipal sewage plant as to-be-treated water, adding 8-13 mg / L of nitrous acid and 40-80 mg / L of glucose into the to-be-treated water according to the content of the material in the to-be-treated water, enabling the to-be-treated water to oxidize ammonia nitrogen in the water into the nitrous acid in the aerobic denitrification biofilter, further reducing the nitrite into the nitrogen gas, mechanically stirring, precipitating in a settling pond, filtering in a sand filter, removing a suspended solid and part of bacteriaand microorganisms in the water, and finally treating through an ultrafiltration reverse osmosis system. The process solves the problems of high energy consumption, insufficient carbon source, shortservice lives of an ultrafiltration film and a reverse osmosis film in the denitration process of the water treatment of the power plant, and provides a technical support for the reliability of the application of the recycled municipal secondary effluent into the boiler water of the power plant.

Description

technical field [0001] The invention relates to waste water treatment, in particular to a method for recycling municipal secondary city effluent water to power plant boiler water, and belongs to the technical field of sewage treatment. Background technique [0002] my country has always been a big country with shortage of water resources. Thermal power generation is the main source of power generation in our country, making power plants a major water consumer in our country. In order to alleviate the current situation of water shortage in my country, the reuse of urban sewage is the main way to solve this problem. This move can not only expand the scale of urban sewage reuse, but also provide sufficient water and stable water quality for power plants. [0003] In power production, impurities in water have a great impact on water treatment equipment and thermal equipment. Municipal secondary urban effluent (urban effluent from the secondary treatment of urban sewage treatme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
CPCC02F1/001C02F1/441C02F1/444C02F1/50C02F1/5245C02F1/56C02F3/302C02F9/00
Inventor 陈元彩王婧豪娄宏伟周晓岚唐军武戴大峰熊峰凌敏婵陈文中
Owner SOUTH CHINA UNIV OF TECH