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A method for efficient treatment and reuse of chemical wastewater biochemical effluent

A technology for biochemical effluent and chemical wastewater, applied in the direction of oxidized water/sewage treatment, multi-stage water/sewage treatment, adsorption water/sewage treatment, etc. The effect of workload

Active Publication Date: 2015-11-04
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of poor effluent quality due to the residual refractory substances in the water after the biochemical treatment process of chemical wastewater in the existing process, the present invention provides an efficient treatment and reuse method for biochemical effluent of chemical wastewater, It can effectively remove the refractory substances in the biochemical effluent of chemical wastewater, and the effluent meets the national urban sewage treatment plant pollutant discharge level A standard and the relevant reclaimed water reuse standard, suitable for advanced treatment and reuse of wastewater

Method used

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  • A method for efficient treatment and reuse of chemical wastewater biochemical effluent
  • A method for efficient treatment and reuse of chemical wastewater biochemical effluent
  • A method for efficient treatment and reuse of chemical wastewater biochemical effluent

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The water quality of biochemical effluent from a large chemical wastewater treatment plant is shown in Table 1. After adjusting the pH value to 5.5, ferrous sulfate and hydrogen peroxide were sequentially added to the water sample for Fenton oxidation to make Fe 2+ Concentration is 3mmol / L, H 2 o 2 The concentration is 5mmol / L, and the reaction time is 300 minutes. Fenton’s oxidized effluent reacts with amine-modified magnetic ultra-high cross-linked composite functional resins (resins in Examples 1-9, all of which are disclosed in patent documents with patent application number 201310106265.5) that account for 4% of the water volume , After reacting for 800 minutes, solid-liquid separation was carried out. The quality of the effluent after separation is shown in Table 1. The desorption solution containing 6wt.% sodium hydroxide and 80wt.% methanol is used for regeneration, and the regeneration time is 150 minutes. Regenerated resin continues to react as fresh resi...

Embodiment 2

[0029] The water quality of the biochemical effluent of a medium-sized chemical wastewater treatment plant is shown in Table 2. After adjusting the pH value to 6, ferrous sulfate and hydrogen peroxide were sequentially added to the water sample for Fenton oxidation to make Fe 2+ Concentration is 2.5mmol / L, H 2 o 2 The concentration is 4mmol / L, and the reaction time is 600 minutes. The Fenton oxidation effluent was reacted with the amine-modified magnetic ultra-high cross-linked composite functional resin accounting for 2% of the water volume, and after 600 minutes of reaction, solid-liquid separation was carried out. The water quality after separation is shown in Table 2. The regeneration is performed with a desorption liquid containing 10wt.% sodium hydroxide and 70wt.% methanol, and the regeneration time is 180 minutes. Regenerated resin continues to react as fresh resin. The waste water of this plant complies with the recycled water reuse standard, which is listed in T...

Embodiment 3

[0033]The water quality of the biochemical effluent of a medium-sized chemical wastewater treatment plant is shown in Table 3. After adjusting the pH value to 7, ferrous sulfate and hydrogen peroxide were added to the water sample for Fenton oxidation to make Fe 2+ Concentration is 2mmol / L, H 2 o 2 The concentration is 4.5mmol / L, and the reaction time is 400 minutes. Fenton oxidation effluent was reacted with amine-modified magnetic ultra-high cross-linked composite functional resin accounting for 3% of water volume, and solid-liquid separation was carried out after 500 minutes of reaction. The quality of the effluent after separation is shown in Table 3. Regenerate with a desorption solution containing 18wt.% sodium hydroxide and 50wt.% methanol, and the regeneration time is 60 minutes. Regenerated resin continues to react as fresh resin. The waste water of this plant complies with the recycling standard of reclaimed water, which is listed in Table 3 with reference to th...

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Abstract

The invention relates to a high-efficiency treatment and recycling method of chemical industry wastewater and biochemical effluent and belongs to the field of wastewater treatment. The method comprises the following steps: (1) carrying out a Fenton oxidation reaction in a reaction tank, regulating the pH value to be 5-7, and adding ferrous sulfate and hydrogen peroxide into a water sample, so as to enable concentration of Fe<2+> and H2O2 respectively to be 1-3 mmol / L and 2-5 mmol / L, and performing reaction for 60-600 minutes; (2) mixing butylated hyper-crosslinked resin with effluent in the step (1), wherein the amount of the resin is 0.1-5 percent of the volume of the water, and mixing for 10-1000 minutes; (3) performing solid-liquid separation of the resin and water in the effluent in the step (2), so as to enable the separated effluent to be discharged or directly recycled. According to the method, hardly degradable substances in the chemical industry wastewater and the biochemical effluent can be effectively removed, the effluent meets the primary A discharge standard of pollutants for municipal wastewater treatment plants and related reclaimed water recycling standards, and the method is applied to advanced treatment and recycling of wastewater.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and more specifically relates to a high-efficiency treatment and reuse method for biochemical effluent of chemical waste water. Background technique [0002] The discharge of wastewater in the chemical industry is huge, and it contains a large amount of toxic and harmful substances that are difficult to degrade. It is difficult to efficiently treat this type of wastewater with the conventional processes currently used. Wastewater enters the environment, causing serious pollution, and a large amount of toxic organic matter migrates and accumulates in nature, directly or indirectly causing harm to human health. Therefore, a large number of advanced treatment technologies are widely used to strengthen the treatment effect of chemical wastewater and biochemical effluent, so that it can be discharged up to the standard and even reclaimed water can be reused. [0003] Commonly used advanced treatm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/72C02F1/28
Inventor 周庆周伟伟李爱民双陈冬李权王梦乔张满成王未史倩倩马艳徐子潇
Owner NANJING UNIV
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