Method for promoting ferment acid production of excess sludge through soapnut saponin production leftovers

A technology of sapindus saponin and excess sludge, which is applied in biological sludge treatment, fermentation, chemical instruments and methods, etc., can solve the problems of increasing excess sludge output, increasing operating costs, and being uneconomical, and achieving the realization of The effect of reducing excess sludge, increasing acid production and realizing resource utilization

Inactive Publication Date: 2016-04-20
JINGGANGSHAN COLLEGE
2 Cites 0 Cited by

AI-Extracted Technical Summary

Problems solved by technology

At present, in the process of domestic sewage treatment in southern cities, there is a common problem of low carbon-nitrogen ratio. It is often necessary to add external carbon sources to achieve the purpose of nitrogen and phosphorus removal. However, adding external carbon sources will not only increase operating costs, but also In the process of sewage treatment, it will be converted into excess sludge, further increasing the output of excess sludge
Studies have found that the presence of chemical surfa...
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Method used

The daily monitoring result to VFAs in embodiment 1~3 and comparative example shows that adding sapindus saponin produces leftovers and can significantly improve the effect of sludge anaerobic acid production, wherein does not add sapindus saponin production The highest VFAs concentration of the control group of leftovers appeared on the 8th day of fermentation, and the amount of acid production was 42mg/gDS (DrySludge, dry sludge); the highest VFAs concentration of each group embodiment of adding sapindus ...
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Abstract

The invention discloses a method for promoting ferment acid production of excess sludge through soapnut saponin production leftovers. The method includes the steps of firstly, drying the soapnut saponin production leftovers; secondly, putting the soapnut saponin production leftovers into concentrated excess sludge; thirdly, conducting anaerobic fermentation on the excess sludge; fourthly, conducting solid-liquid separation on ferment liquid to obtain clear liquid containing volatile fatty acid. By adding the soapnut saponin production leftovers, the hydrolysis fermentation acid yield of the excess sludge is increased, and meanwhile the resource utilization of the soapnut saponin production leftovers and the consumption decrease of the excess sludge are achieved.

Application Domain

Specific water treatment objectivesFermentation +1

Technology Topic

ChemistryAcid production +7

Examples

  • Experimental program(3)
  • Comparison scheme(1)

Example Embodiment

[0021] Example 1
[0022] In the embodiment of the present invention, the method for using the leftovers produced by Sapindus saponin to promote acid production by fermentation of excess sludge includes the following steps:
[0023] (1) Sapindus saponin produced by water extraction method 20g of sapindus saponin produced by the enterprise (the content of sapindus saponin is 1‰) is dried with a moisture content of 70%, and a moisture content of 10% is obtained. Material 5.34g;
[0024] (2) Leave the remaining sludge to settle for 36 hours until the concentration of the lower layer of concentrated sludge is 25g/L, remove the supernatant, and take 2000ml of concentrated sludge into a 5L anaerobic fermentation tank; produce according to Sapindus Saponin Leftovers: The mass ratio of dry sludge is 0.1:1. Add 5g of the leftovers from the soappin saponins production to the concentrated remaining sludge;
[0025] (3) Perform anaerobic fermentation on the remaining sludge. The specific steps are to introduce carbon dioxide into the anaerobic reactor until there is no oxygen in the reactor, and then perform anaerobic fermentation on the remaining sludge at a fermentation temperature of 30°C. The time is 20d. During the whole fermentation process, the remaining sludge is mixed and stirred at a low speed of 120rpm to make it evenly mixed;
[0026] (4) Sampling 50ml a day during the fermentation process, using natural sedimentation to separate the fermentation broth from solid-liquid to obtain a clear liquid containing volatile fatty acids. The natural sedimentation time is 8h, and the concentration of VFAs in the clear liquid is determined.

Example Embodiment

[0027] Example 2
[0028] In the embodiment of the present invention, the method for using the leftovers produced by Sapindus saponin to promote acid production by fermentation of excess sludge includes the following steps:
[0029] (1) Sapindus saponin produced by water extraction method production of sapindus saponin production scraps 375g (the content of sapindus saponin is 1%) moisture content is 80%, and the moisture content is 50% scraps 150g;
[0030] (2) Leave the remaining sludge to settle for 36 hours until the concentration of the lower layer of concentrated sludge is 25g/L, remove the supernatant, and take 2000ml of concentrated sludge into a 5L anaerobic fermentation tank; produce according to Sapindus Saponin Leftovers: The mass ratio of dry sludge is 3:1. Add 150g of the leftovers from the soappin saponins production to the concentrated remaining sludge;
[0031] (3) Perform anaerobic fermentation on the remaining sludge. The specific steps are to first pass carbon dioxide into the anaerobic reactor until there is no oxygen in the reactor, and then perform anaerobic fermentation on the remaining sludge at a fermentation temperature of 35°C. The time is 8 days. During the whole fermentation process, the remaining sludge is mixed and stirred at a low speed of 100 rpm to make it evenly mixed;
[0032] (4) During the fermentation process, 50ml is sampled every day, and the fermentation broth is separated by natural sedimentation to obtain a clear liquid containing volatile fatty acids. The natural sedimentation time is 24h. The concentration of VFAs in the serum is measured every day.

Example Embodiment

[0033] Example 3
[0034] In the embodiment of the present invention, the method for using the leftovers produced by Sapindus saponin to promote acid production by fermentation of excess sludge includes the following steps:
[0035] (1) 400g of soapspin saponins produced by the water extraction method for production of sapindus saponin (the content of sapindus saponin is 6‰) is dried with a moisture content of 80%, and a water content of 20% is obtained. ;
[0036] (2) Leave the remaining sludge to settle for 36 hours until the concentration of the lower layer of concentrated sludge is 25g/L, remove the supernatant, and take 2000ml of concentrated sludge into a 5L anaerobic fermentation tank; produce according to Sapindus Saponin Leftovers: The mass ratio of dry sludge is 2:1, and 100g of the leftovers from the soappin saponins production are added to the concentrated remaining sludge;
[0037] (3) Perform anaerobic fermentation on the remaining sludge. The specific steps are to introduce carbon dioxide into the anaerobic reactor until there is no oxygen in the reactor, and then perform anaerobic fermentation on the remaining sludge at a fermentation temperature of 33°C. The time is 18 days. During the whole fermentation process, the remaining sludge is mixed and stirred at a low speed of 120 rpm to make it evenly mixed;
[0038] (4) During the fermentation process, 50ml is sampled every day, and the fermentation broth is separated by natural sedimentation to obtain a clear liquid containing volatile fatty acids. The natural sedimentation time is 20h. Determine the concentration of VFAs in the supernatant.
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