Method for alleviating swelling of filamentous bacterium-containing activated sludge under low-temperature condition

A technology of activated sludge and low-temperature conditions, which is applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc., and can solve unstable operation effects, reduced mud-water separation effect, long recovery period, etc. problems, to achieve the effect of enhancing the separation effect of mud and water, increasing the specific gravity of sludge, and increasing the sludge load

Inactive Publication Date: 2018-02-23
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Purpose: In order to overcome the deficiencies in the prior art, the present invention provides a method for alleviating the expansion of activated sludge filamentous bacteria under low temperature conditions, and solves the separation of sludge and water after the problem of filamentous bacteria sludge expansion occurs in activated sludge treatment plants Decline in effect, unstable operation, long recovery period, etc.

Method used

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  • Method for alleviating swelling of filamentous bacterium-containing activated sludge under low-temperature condition
  • Method for alleviating swelling of filamentous bacterium-containing activated sludge under low-temperature condition
  • Method for alleviating swelling of filamentous bacterium-containing activated sludge under low-temperature condition

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Embodiment 1

[0030] Step 1: Increase the sludge load. According to the sludge concentration (3200 mg / L) of the expanded sludge and the influent COD (80-100 mg / L) index, the sludge load is increased by increasing the sludge discharge, so that the sludge load is from 0.025kgCOD / kgMLSS• d reaches 0.075kgCOD / kgMLSS•d. The sewage load in the reaction tank increases, which is more suitable for the growth of microbes and inhibits the growth of filamentous bacteria with stronger growth ability under low load.

[0031] Step 2: The external boiler steam is used to heat the inlet water in the regulating tank, and the blast aeration equipment is used to increase aeration. The standby blast aeration device was turned on, and the DO concentration of the water body was increased from 3.0 mg / L to 3.5 mg / L. A higher dissolved oxygen concentration can promote nitrification and avoid local anaerobic and hypoxia in the reaction tank. Due to the heat tracing of the external boiler steam and the heat generation ...

Embodiment 2

[0035] Step 1: Increase the sludge load. According to the sludge concentration (3200 mg / L) of the expanded sludge and the influent COD (80-100 mg / L) indicators, the sludge load is reduced by increasing the sludge discharge, so that the sludge load is reduced from 0.03 kgCOD / kgMLSS· d reaches 0.09 kgCOD / kgMLSS·d.

[0036] Step 2: The external boiler steam is used to heat the inlet water in the regulating tank, and the blast aeration equipment is used to increase aeration. The standby blast aeration device was turned on, and the DO concentration of the water body was increased from 3.0 mg / L to 4 mg / L. A higher dissolved oxygen concentration can promote nitrification and avoid local anaerobic and hypoxia in the reaction tank. Due to the heat tracing of the external boiler steam and the heat generation of the blast aeration equipment, the temperature of the mud-water mixture rose from 7°C to 11°C.

[0037] Step 3: Loess dosing is divided into two stages. In the first stage, loess is ...

Embodiment 3

[0040] Step 1: Increase the sludge load. According to the sludge concentration (3200 mg / L) of the expanded sludge and the influent COD (80-100 mg / L) indicators, the sludge load is reduced by increasing the sludge discharge, so that the sludge load is reduced from 0.03 kgCOD / kgMLSS· d reaches 0.08 kgCOD / kgMLSS·d.

[0041] Step 2: The external boiler steam is used to heat the inlet water in the regulating tank, and the blast aeration equipment is used to increase aeration. The standby blast aeration device is turned on, and the DO concentration of the water body is increased from 2.9 mg / L to 3.8 mg / L. The higher dissolved oxygen concentration can promote nitrification and avoid local anaerobic and hypoxia in the reaction tank. Due to the heating of the external boiler steam and the heat generation of the blast aeration equipment, the temperature of the mud-water mixture rose from 10°C to 12°C.

[0042] Step 3: Loess dosing is divided into two stages. In the first stage, loess is un...

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Abstract

The invention discloses a method for alleviating swelling of filamentous bacterium-containing activated sludge under a low-temperature condition. The method comprises the following steps: firstly increasing the sludge load in a reaction tank, tracing heat of inlet water of the reaction tank, increasing aeration by using blowing aeration equipment so as to increase the dissolved oxygen concentration in water of an aerobic aeration tank section of the reaction tank and the temperature of sludge-and-water mixed liquid, and then adding loess as a modifier into the aerobic aeration tank section ofthe reaction tank by two stages so as to increase the proportion of sludge. By the method, the common problem of the swelling of the filamentous bacterium-containing sludge caused by low temperature in an aerobic activated sludge treatment technology is economically and quickly solved; meanwhile, a modifying process does not affect pollutant-removing, denitrifying and dephosphorizing effects of the sludge, and the activated sludge can still effectively remove pollutant indexes such as suspended particulates, CODs, total nitrogen, total phosphorus and the like from influent water.

Description

Technical field [0001] The invention belongs to the technical field of biochemical sewage treatment, and relates to a method for alleviating the expansion of activated sludge filamentous bacteria under low temperature conditions. Background technique [0002] Activated sludge method is a sewage purification process with relatively low cost and good treatment effect, which is widely used in urban sewage treatment plants. About 60% of urban sewage treatment plants and most industrial wastewater treatment plants in China adopt the activated sludge method. This method is suitable for processing sewage with a high degree of purification and stability, and has the characteristics of high flexibility. When the influent load increases, it can be solved by increasing the return ratio of sludge. The activated sludge is fully mixed with the sewage that enters the biochemical reaction tank. After the treated mud-water mixture enters the secondary settling tank, the mud-water is separated by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCC02F3/12Y02W10/10
Inventor 王龙飞白忠龙李轶牛丽华张培胜
Owner HOHAI UNIV
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