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Non-discharge method for treating highly concentrated organic waste water using bio-evaporation

A technology of organic wastewater and biological evaporation, applied in the adjustment method of biological treatment, biological organic part treatment, biological water/sewage treatment, etc., can solve control problems, obtain clean water, and methanogens are susceptible to various toxic substances Damage and other issues, to achieve the effect of minimizing energy consumption

Inactive Publication Date: 2015-01-28
MYONGJI UNIV IND & ACAD COOPERATION FOUND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the activated sludge treatment method has the disadvantage that its treatment is limited to low-concentration organic wastewater, even with properly engineered microorganisms
However, anaerobic digestion also has the following disadvantages: the method requires a start-up time of at least 8 to 12 weeks, the methanogens are susceptible to various toxic substances, there are usually control problems during anaerobic digestion, etc.
However, this method also has the disadvantage that the high solids content under conditions of limited hydrolysis delays sludge formation and thus severely inhibits microbial metabolism
However, high-concentration wastewater requires a lot of energy to perform the process, so it is difficult to obtain clean water through the membrane separation process

Method used

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  • Non-discharge method for treating highly concentrated organic waste water using bio-evaporation
  • Non-discharge method for treating highly concentrated organic waste water using bio-evaporation
  • Non-discharge method for treating highly concentrated organic waste water using bio-evaporation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0143] Example 1: Biovaporization using glucose solution

[0144] Bioevaporation was carried out by mixing 404 mL of glucose solution (610 g / L) with 7.29 kg of biologically dried sludge (water content: 56.5% by weight), adding the mixture to a 28.3 L adiabatic reactor, and then adding 2.04 L Air was supplied to the reactor at a rate of 100 Å / min.

[0145] Such as image 3 As shown in , the temperature of the reactor increases rapidly after adding the glucose solution to the reactor. The temperature reached 71.4°C after 28 hours and returned to room temperature after 96 hours. However, the temperature of the control reactor to which no glucose solution was added was maintained at about room temperature. After observing the temperature changes, it was confirmed that the microorganisms in the sludge bed utilized glucose as an energy source for their metabolism with a short lag time.

[0146] Such as Figure 4 As shown in , when the reactor temperature increases, the oxygen...

Embodiment 2 to 6

[0180] Examples 2 to 6 and comparative example: biovaporization using glucose solution

[0181] In order to determine the relationship between glucose concentration and water evaporation, bioevaporation experiments were carried out with different glucose solutions prepared in Examples 2 to 6 and Comparative Example.

[0182] The heat production and water evaporation of the glucose concentration according to the theoretical simulations of Examples 2 to 6 and Comparative Example 1 are shown in Table 5 below.

[0183] 【table 5】

[0184]

[0185] To calculate the values ​​in Table 5 above, since the heat used for water evaporation was found to be 64.5% in Example 1, it was assumed that 65% of the heat generated by microbial metabolism had been used for water evaporation. Accordingly, assuming that the average temperature for biovaporization is 50 °C, the latent heat of water evaporation is 2344 kJ / kg. The amount of water evaporation by metabolic heat is calculated by dividi...

Embodiment 7 to 11

[0187] Examples 7 to 11 and Comparative Example: Biovaporization using a solution of food waste powder

[0188] Bioevaporation experiments were performed by mixing a solution of food waste instead of a glucose solution with biologically dried sludge to check whether the bioevaporation process can be practically applied to wastewater treatment. Food waste powders were prepared at concentrations of 42g / L, 82g / L, 120g / L, 157g / L and 194g / L and used in Examples 7 to 11, respectively. For the comparative example, 100 mL of water containing no food waste powder was used. The experimental results are shown in Figures 10 to 16 middle. In order to regulate the rapid microbial metabolism of food waste, the food waste powder is prepared as fine particles with a diameter of 1 mm or less. The VS content of the food waste powder in a dry state was 93.4% relative to the total solids.

[0189] Since the solution of food waste powder (194 g VS / L) contained readily biodegradable VS, the t...

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Abstract

Disclosed herein is a method for zero-discharge treatment of high-concentration organic wastewater by mixing sludge with high-concentration organic wastewater. The sludge is biodried sludge prepared by a method including preparing a sludge mixture consisting of belt-pressed sludge and dried sludge; and collecting the sludge mixture when its temperature finally becomes stable by returning to room temperature. The high-concentration organic wastewater used contained small particles of pulverized food waste having a diameter of 1 mm or less. The treatment was performed by decomposing the organic materials using microorganisms contained in the sludge via metabolism, followed by water evaporation caused by the metabolic heat generated by the decomposition of the organic materials, in which the microbial metabolism was performed under an aerobic condition.

Description

technical field [0001] The present invention generally relates to a method for zero-discharge treatment of high-concentration organic wastewater through biological evaporation, and more particularly, relates to a method for treating high-concentration organic wastewater by means of biological evaporation by mixing sludge and high-concentration organic wastewater. The method of zero discharge disposal. Background technique [0002] As is well known in the art, wastewater discharges from the food, leather, chemical and paper industries generally contain high concentrations of organic matter. High-concentration organic wastewater often destroys the beauty of the environment by producing slime, increasing the concentration of toxic substances in the drainage area, thereby seriously affecting the local aquatic ecosystem. In addition, high-concentration organic wastewater is one of the main reasons for clogging wastewater pipes. [0003] The conventional activated sludge treatme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F3/34
CPCC02F11/12C02F3/34C02F3/02C05F7/00C02F1/04C05F17/40C02F11/123C02F11/13Y02P20/145C02F3/006C02F2209/001C02F2209/005C02F2209/02C02F2209/38C02F2303/10C02F2103/32Y02W10/30Y02A40/20Y02W30/40Y02W10/10C02F11/02C02F3/1205C02F3/348
Inventor 张德镇杨本芹
Owner MYONGJI UNIV IND & ACAD COOPERATION FOUND
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