Method for preparing rapid external carbon source through cassava ethanol wastewater

A cassava alcohol and wastewater technology, which is applied in chemical instruments and methods, food industry wastewater treatment, biological water/sewage treatment, etc., can solve the problems of high effluent COD and unstable wastewater quality, and achieve the effect of convenient operation

Inactive Publication Date: 2013-09-18
TONGJI UNIV
View PDF6 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, it has been reported that the acidified fermentation broth of excess sludge can be used as a supplementary carbon source for sewage plants, but the fermentation broth contains high concentrations of ammonia nitrogen and phosphorus that require further pretreatment, an

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing rapid external carbon source through cassava ethanol wastewater
  • Method for preparing rapid external carbon source through cassava ethanol wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Using cassava alcohol wastewater as the substrate, take 270mL of the above substrate, inoculate 30mL of granular sludge, adjust the initial pH to 9, and place them in 35 o C and 55 o Under the condition of C, perform anaerobic fermentation for 48 hours, pour out 270 mL of the upper liquid after standing for half an hour, and add an equal volume of fresh cassava alcohol wastewater to adjust the initial pH=9, and the other fermentation conditions are the same as above, continue to ferment for 48 hours, and repeat this operation Five batches of experiments. Samples were taken for each batch of experiments to determine VFA concentration, SCOD, etc. The results showed that the total amount of VFA was slightly increased under high temperature conditions compared with medium temperature conditions, and the content of n-butyric acid and acetic acid was higher under high temperature conditions. When cassava alcohol wastewater is used as the substrate, it is recommended to choo...

Embodiment 2

[0024] Take 360mL of cassava alcohol wastewater, inoculate 40mL of granular sludge, adjust the initial pH=8, place it in a water bath shaker with a rotation speed of 120r / min, and keep anaerobic fermentation at medium temperature for 3 days, and the content of volatile acid can reach 9.5gCOD / L , accounting for 27% of SCOD. Volatile acids are mainly composed of n-butyric acid, acetic acid and propionic acid, of which acetic acid is 512mg / L, propionic acid is 764mg / L, n-butyric acid is 7121mg / L, and the high-quality carbon source content (propionic acid + acetic acid content) reaches 24%.

Embodiment 3

[0026] According to the same matrix and inoculated sludge conditions of Example 2, adjust the initial fermentation pH=9, (35 under the medium temperature condition o C), after 3 days of anaerobic fermentation, the content of volatile acids can reach 12.2g / L, including 2084mg / L acetic acid, 958mg / L propionic acid, 7860mg / L n-butyric acid, high-quality carbon source (propionic acid + acetic acid content) Reached 46%. The total volatile acid content (calculated as COD) accounts for 38% of SCOD.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the technical field of environmental protection, and particularly relates to a method for preparing a rapid external carbon source through cassava ethanol wastewater. The method is characterized in that the key factor, reaction temperature and pH (Potential of Hydrogen) in the anaerobic fermentation of the cassava ethanol wastewater are controlled on the basis of the characteristics of the cassava ethanol wastewater of high carbohydrate content and relatively low nitrogen and phosphorus contents, so as to realize the purpose of converting an organic matter into volatile fatty acids to the maximum; the volatile acid content in the fermentation broth (based on COD (Chemical Oxygen Demand)) accounts for 70 to 80% of the SCOD (Soluble Chemical Oxygen Demand); the volatile acid mainly comprises the components namely acetic acid, propionic acid and butyric acid. Compared with sludge hydrolyzed acidifying carbon source, the rapid external carbon source has the advantages that the volatile fatty acids in the fermentation broth is at high concentration, and the fermentation broth is high in nitrogen and phosphorus contents and can be directly used as the external carbon source used for nitrogen and phosphorus removal in urban sewage treatment.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for preparing a fast denitrification carbon source by utilizing cassava alcohol wastewater. Background technique [0002] At present, more and more countries around the world are seriously polluted by nitrates on the surface and underground water bodies, and eutrophication of water bodies often occurs, and people's drinking water sources are mostly ground water and surface water, so this threatens people to a large extent. drinking water safety. Long-term intake of excessive nitrate by the human body can cause methemoglobinemia and even cancer. At present, there are many ways to remove nitrate nitrogen in water, such as: ion exchange method, reverse osmosis method and biological denitrification method and so on. Among the many denitrification methods, biological denitrification has attracted the most attention due to its advantages of safet...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C02F3/34C02F103/32
Inventor 谢丽刘辉陈银广周琪
Owner TONGJI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap