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Process for combined water treatment of chemical oxidizing-biological biological filtering tank

A biological aerated filter and chemical oxidation technology, applied in the direction of oxidized water/sewage treatment, sustainable biological treatment, chemical instruments and methods, etc., can solve problems such as organic pollution, achieve high microbial biomass, reduce infrastructure costs, and resist The effect of strong impact load capacity

Active Publication Date: 2008-07-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Provides an economical and effective treatment process to solve the problem that the possibility of water source water being polluted by refractory organic matter increases, and meets people's requirements for the improvement of tap water quality and the removal of organic matter in tap water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Treatment of simulated wastewater containing refractory biodegradable acid rose bengal by using Fenton's reagent-biological aerated filter process. First, through the pretreatment of Fenton's reagent, the Fe 2+ / H 2 o 2 0.5:1, H 2 o 2 / COD is 2:1. Under these conditions, the chroma removal rate is 99%, and the COD removal rate is 46.94%. The chemical pre-oxidation residence time is 1 hour, and then the simulated wastewater pretreated by Fenton’s reagent is added with NaOH to adjust its pH value to 6.8-7.5, and then enters the sedimentation tank (not necessarily accurate to 6.8 or 7.5), and the wastewater is removed in the sedimentation tank Suspended matter in the wastewater, the residence time of the wastewater in the sedimentation tank is 1.5 hours, and the supernatant after the sedimentation treatment is passed through the biological aerated filter for subsequent biochemical treatment. The residence time in the biological aerated filter is 3 hours. The COD rem...

Embodiment 2

[0026] The ozone-biological aerated filter process was used to treat the simulated wastewater containing acid rose bengal which was difficult to biodegrade. First, the chroma is removed by ozone pretreatment, the ozone dosage is 2:1 in the mass ratio of ozone to COD, the ozonation time is 30 minutes, the chroma removal rate is 98%, and the COD removal rate is 30%. After ozone pretreatment Although the COD removal rate of the simulated wastewater in the future is not high, the biodegradability has been greatly improved. The effluent after ozone treatment enters the intermediate adjustment tank, and the wastewater stays in the intermediate adjustment tank for 50 minutes before entering the subsequent biological aerated filter. Although BAF has basically no removal effect on chroma, it has a good removal effect on COD. The residence time in the biological aerated filter is 6 hours, and the COD removal rate reaches 84.9%. The average COD of the original influent water is 250mg / L...

Embodiment 3

[0028] The average value of COD in the effluent of a chemical plant wastewater after secondary biochemical treatment is 120mg / L, which is slightly higher than the wastewater discharge standard at that time. The wastewater has been biochemically treated. Most of the organic matter in the water is difficult to further biochemically treat. Fenton’s reagent-biological aerated filter process is used to determine the Fe 2+ / H 2 o 2 2:1, H 2 o 2 / COD is 0.2:1. The chemical oxidation reaction time is 1.5 hours, and then the water pretreated by Fenton's reagent is added with potassium hydroxide to adjust the pH value to 7-8, and then enters the sedimentation tank to remove suspended solids in the water, and the residence time in the sedimentation tank is 1 hour , and the supernatant is subjected to subsequent biochemical treatment through a biological aerated filter. The residence time of the biological aerated filter is 2 hours, and the COD value of the effluent after treatment is...

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Abstract

A process for treating the polluted water source or sewage by combination of chemical oxidizing and aerating-bio-filtering pool includes such steps as chemical oxidizing, regulating pool and aerating bio-filter pool. If the Fendun agent is used as the chemical oxidant, a depositing pool is additionally used. Its advantages are high effect and low cost.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to the field of treating polluted water source water and waste water, especially waste water containing refractory biodegradable organic matter, by using a combined process of chemical oxidation and aerated biological filter. Background technique [0002] As a wastewater oxidation technology, chemical oxidation is widely used to remove refractory biodegradable organic matter in water and improve the biodegradability of wastewater. The chemical oxidants used in the method include: Fenton's reagent (redox system composed of hydrogen peroxide and ferrous ions), ozone, sodium hypochlorite, potassium permanganate, etc. However, if this method is used alone, the amount of medicament dosage is often large, the required cost is too high, and the economy is poor. [0003] The biological aerated filter (BAF) process is mainly used in low-concentration sewage treatment, such as urban domestic s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/72C02F1/52C02F3/02
CPCY02W10/10
Inventor 汪晓军林德贤万小芳顾晓扬董方
Owner SOUTH CHINA UNIV OF TECH
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