Method for strengthening alkaline fermentation sludge reduction of excess sludge by adding NaCl

Abstract

The invention discloses a method for strengthening alkaline fermentation sludge reduction of excess sludge by adding NaCl and belongs to the technical fields of sludge anaerobic fermentation and sludge reduction. The method comprises the following steps: taking excess sludge for an SBR pilot plant test as fermentation device starting sludge, wherein after the sludge is elutriated with running water, the sludge indexes are that the sludge concentration MLSS is 9,000-10,000mg/L and the pH value is 7-8; adding the elutriated excess sludge to a miniature SBR device with the capacity of less than 3L; preparing 2-4mol/L NaOH solution in an alkali reagent box; and stirring in the miniature SBR device for 30-60 minutes, and then starting an NaOH dosing pump to pump the NaOH solution into the miniature SBR device. Hydrolysis of the excessive sludge can be promoted under the alkaline condition, the activity of methanogens can be restrained; in addition, the structure of EPS can be destroyed by high-concentration Na<+> under the alkaline condition, the amount of release of protein and polysaccharide is increased, and the autolysis speed of the excess sludge is quickened; therefore, the purpose of excess sludge reduction is achieved.

Description

technical field [0001] The invention relates to a method for strengthening excess sludge alkaline fermentation sludge reduction, which belongs to the technical field of sludge anaerobic fermentation and sludge reduction. Background technique [0002] At present, domestic and foreign sewage treatment plants usually use the activated sludge method to treat urban domestic sewage, but the treatment of domestic sewage by the activated sludge method will produce a large amount of excess sludge. The excess sludge contains a large amount of toxic and harmful substances, such as pathogenic microorganisms, heavy metals, etc. Therefore, if the excess sludge is not properly treated and disposed of, it will cause serious pollution to the environment. [0003] The treatment and disposal methods of excess sludge mainly include sanitary landfill, incineration, land utilization, etc. The land use method has the characteristics of low energy consumption and the use of nutrients in the excess...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of limited reduction of excess sludge fermentation sludge under alkaline conditions, the present invention proposes a method of adding NaCl to strengthen the reduction of excess sludge alkaline fermentation sludge

This method uses a small SBR device to change the traditional simple addition of alkali to increase the fermentation rate of sludge fermentation. At the same time, sodium chloride is added as an auxiliary agent to solve the problem of limited reduction of excess sludge and the treatment and disposal of salty sludge.

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