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Deep treatment method for coking waste water

A technology for advanced treatment of coking wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, adsorption water/sewage treatment, etc., can solve the problem of large dosage, large flocculant dosage, and unclear treatment conditions And other issues

Inactive Publication Date: 2007-11-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the flocculant used in Document 1 needs to adjust the pH value during use, and the dosage is relatively large. Using activated carbon as the adsorbent also costs a lot. The water quality of the effluent only clarifies that the COD index after treatment can reach National Secondary Standards for Wastewater; Document 2 Aiming at the problem that the high discharge of COD in the effluent of the secondary sedimentation tank of coking wastewater is difficult to meet the standard, a new flocculant polysilicon aluminum chloride was prepared. Larger, the use of slag as the adsorbent can achieve the purpose of waste recycling, and the effluent can only reduce COD to meet the national emission standards
The above two relatively similar treatment technologies can only reduce COD and other pollutants, and the treatment of other water quality indicators, especially ammonia nitrogen, is not clear

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Flocculation pretreatment: The coking wastewater that has not reached the standard after biochemical treatment flows into the flocculation stirring tank, and the PFASSB flocculant with a molar ratio of Fe / Si=0.5, Si / (Al+Fe)=0.8, B / Si=0.3 is added, It can avoid adjusting the pH value of the water during the treatment process. The dosage is 10mg / L, stirred at a speed of 120rpm for 1min, and then stirred at a speed of 40rpm for 5min.

[0022] 2. Adsorption secondary treatment: the waste water after flocculation treatment flows into the adjustment tank, and the waste acid and waste alkali are used to adjust the pH value of the waste water to 4-5, then enter the adsorption bed of fly ash, and add 150g / L powder with a particle size of 100 mesh Coal ash and 2.5g / L lime are adsorbed by constant temperature oscillation for 1 hour, then flow into the sedimentation tank and stand still, and the supernatant is drained out to obtain the treated effluent.

Embodiment 2

[0024] 1. Flocculation pretreatment: Coking wastewater that has not reached the standard after biochemical treatment flows into the flocculation stirring tank, and Fe / Si=0.4, Si / (Al+Fe)=0.7, B / Si=0.25PFASSB flocculant is added. During the treatment process, it can No need to adjust the pH value of the water quality, the dosage is 11mg / L, stir at 140rpm for 2min, then 30rpm for 7min, pass the treated wastewater into the flocculation sedimentation tank, and let it settle for 40min.

[0025] 2. Adsorption secondary treatment: the waste water after flocculation treatment flows into the adjustment tank, and the pH value of the waste water is adjusted to 5 with waste acid and waste alkali, and then enters the adsorption bed of fly ash, and 130g / L fly ash with a particle size of 120 mesh is added and 2.0g / L of lime, oscillating at a constant temperature for 1 hour, then flowing into the sedimentation tank and standing still, and draining the supernatant to obtain the treated effluent....

Embodiment 3

[0027] 1. Flocculation pretreatment: The coking wastewater that has not reached the standard after biochemical treatment flows into the flocculation mixing tank, and Fe / Si=0.6, Si / (Al+Fe)=0.9, B / Si=0.35PFASSB flocculant is added. During the treatment process, it can No need to adjust the pH value of the water quality, the dosage is 12mg / L, stir at a speed of 130rpm for 1min, then stir at a speed of 50rpm for 5min, pass the treated wastewater into the flocculation sedimentation tank, and let it settle for 30min.

[0028]2. Adsorption secondary treatment: the wastewater after flocculation treatment flows into the adjustment tank, adjusts the pH value of the wastewater to 4-5 with waste acid and waste alkali, then enters the adsorption bed of fly ash, and adds 140g / L powder with a particle size of 140 mesh Coal ash and 2.5g / L lime are adsorbed by constant temperature oscillation for 1 hour, then flow into the sedimentation tank and stand still, and the supernatant is drained out t...

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Abstract

The deep coking waste water treating process belongs to the field of environment protecting engineering, and features the flocculant of PFASSB and the adsorbent of fly ash and lime. The deep coking waste water treating process includes the first flocculating pre-treatment with the flocculant, the subsequent pH regulation in a regulating pond with waste acid and waste alkali to 4-5, constant temperature vibrating adsorption in a adsorbing bed with 100-140 size fly ash in 130-150 g / l and lime in 1.5-2.5g / l for 1-2 hr, settling in a settling pond and leading out the supernatant as out water. The said process can obtain out water with COD lowered to 59.1 mg / l and NH3-N decreased from 77.67 mg / l to 19.8 mg / l.

Description

Technical field: [0001] The invention belongs to the field of environmental protection engineering, and in particular relates to a method for treating coking wastewater by utilizing fly ash. Background technique: [0002] Coking wastewater is a kind of industrial wastewater that is difficult to treat. Its composition is very complex, and it contains a variety of organic substances that are difficult to be degraded by microorganisms or are biologically toxic, as well as a large amount of inorganic salts such as ammonium salts, sulfides, and cyanides. one of the major sources of pollution. In practice, the biochemical treatment adopted by most enterprises has a high removal rate of phenolic substances in coking wastewater, but the treatment effect on refractory organic matter is not good, and the effluent COD often fails to meet the national discharge standards. Therefore, it is necessary to seek advanced treatment with good effect and low cost method is positive. [0003] A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F1/52C02F1/28
Inventor 李素芹周静
Owner UNIV OF SCI & TECH BEIJING
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