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Treatment method for removing high concentration urea from wastewater

A treatment method and high-concentration technology, which can be used in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. To achieve the effect of simple reaction conditions, simple and feasible operation method and stable effect

Active Publication Date: 2014-10-22
FOSHAN HUAERAN BIOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the urease hydrolysis method has a good effect on removing urea, it is mainly in the experimental stage at present, and there are difficulties such as difficulty in maintaining urease activity, separation, purification, and fixation of urease.
The chemical oxidation method is directly effective, but it has the disadvantages of large amount of chemical input and uneconomical
The biological treatment method has simple process, simple operation cost and good treatment effect, but it needs a large amount of carbon source when treating high-concentration urea wastewater, which increases the operation cost
Moreover, the high concentration of urea also has a great inhibitory effect on the biochemical treatment system, reducing the operating efficiency of the system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Taking urea wastewater as the treatment object, the urea concentration in the raw water is 18076mg / L. Adjust the pH of the urea wastewater water sample to 9.8, take 250mL water samples into three jars respectively, according to the molar ratio of formaldehyde to urea (F:U value) is 2:1, 5:1 and 10:1 corresponding in Add 6.75mL, 16.88mL and 33.75mL of formaldehyde to the three water samples, shake and react on a water bath shaker at 65°C for 1h; after the reaction is completed, add 5ml of 10% ferrous sulfate solution, Sodium hydroxide solution adjusts the pH of the three water samples to about 8. First stir quickly at 200r / min for 2 minutes, then slowly stir at 60r / min for 10min, let it settle for half an hour, and take the supernatant to measure the urea concentration. The results are shown in Table 1:

[0026] Table 1. Urea content and removal rate results of each water sample

[0027] F:U value

[0028] It can be seen from the data in the table that the gr...

Embodiment 2

[0030] Taking urea wastewater as the treatment object, the urea concentration of urea wastewater is 10050mg / L, adjust the pH of the urea wastewater water sample to be 9.8, get 250mL water samples respectively in three jars, according to the molar ratio of formaldehyde and urea (F:U Value) is 1:1, 3:1 and 5:1 corresponding to adding formaldehyde 1.80mL, 5.10mL and 8.44mL to the three water samples, shaking and reacting on a water bath shaker at 70°C for 2h; after the reaction is complete, add 5mL ferrous sulfate solution with a concentration of 10%, adjust the pH of the three water samples to about 8.0 with a calcium oxide solution, first stir at 200r / min for 2 minutes, then slowly stir at 60r / min for 10min, and let it settle for half Hours, the supernatant was taken to measure the urea concentration. The results are shown in Table 2:

[0031] Table 2. Urea content and removal rate results of each water sample

[0032] F:U value

Embodiment 3

[0034] Taking urea wastewater as the treatment object, the urea concentration of urea wastewater is 4301mg / L, the pH of the urea wastewater water sample is adjusted to be 9.8, and 250mL water samples are respectively taken in three jars, according to the molar ratio of formaldehyde and urea (F:U value) is 1:1, 3:1 and 5:1, add 1.80mL, 5.10mL and 8.44mL of formaldehyde to the three water samples, shake and react on a water bath shaker at 80°C for 3h; after the reaction is completed, add 5mL of 10% ferrous sulfate solution, adjust the pH of the three water samples to 5.0-6.0 with 30% sodium hydroxide solution, first stir at 200r / min for 2 minutes, then slowly stir at 60r / min for 10min , allowed to settle for half an hour, and the supernatant was taken to measure the urea concentration. The results are shown in Table 3:

[0035] Table 3. Urea content and removal rate results of each water sample

[0036] F:U value

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Abstract

The invention belongs to the field of environment protection and wastewater treatment, and discloses a treatment method for removing high concentration urea from wastewater. The treatment method comprises the following steps of (1) adding formaldehyde in the wastewater containing the high concentration urea under an acid or alkaline condition and reacting at a high temperature; and (2) adding a flocculating agent into the wastewater containing the high concentration urea, then regulating the wastewater containing the high concentration urea into a wear acid or weak alkali wastewater containing the high concentration urea under state by using an alkali, mixing with stirring, standing for precipitation, and a supernatant being discharge wastewater with urea removed. Compared with a conventional method, the treatment method provided by the invention is characterized in that reaction conditions are simple, with no need of high temperature or high pressure; an operation method is simple and practical; and a urea removal effect is stable.

Description

technical field [0001] The invention belongs to the field of environmental protection wastewater treatment, and in particular relates to a treatment method for removing high-concentration urea in wastewater. Background technique [0002] Urea is the most used nitrogenous fertilizer product with the highest nitrogen content in the world. At the same time, urea is also an important raw material for plastics, medicine, food, printing and dyeing industries, and chemical products such as melamine, urea-formaldehyde resin, and explosives. Such a large amount of urea production and usage will inevitably produce a large amount of urea wastewater. With the rapid development of industry and agriculture in our country, the environmental problems caused by urea wastewater are becoming more and more serious. [0003] Urea wastewater contains a large amount of ammonia nitrogen. If the wastewater containing urea is directly discharged into the water body, it will inevitably cause huge env...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/38
Inventor 汪晓军饶力郑垒
Owner FOSHAN HUAERAN BIOTECH CO LTD