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Coking waste water joint-treatment process

A coking wastewater and combined treatment technology, applied in water/sewage treatment, aerobic process treatment, anaerobic digestion treatment, etc., can solve problems such as high toxicity, unreachable biochemical process, complex and changeable components, etc., to improve impact resistance Load performance, enhanced anoxic degradation function, and the effect of reducing COD concentration

Inactive Publication Date: 2019-01-15
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the Chinese patent application 201410345998.9, the three-stage A / O process is used to treat coking wastewater. On the one hand, it cannot meet the requirements of more land occupation in the actual project, and on the other hand, the simple biochemical process cannot meet the requirements of (GB16171-2012) New coking enterprises Requirements for wastewater discharge COD≤80mg / L
Chinese patent 200410005197.4 adopts the O-A-O biochemical process, although the ammonia nitrogen in the coking wastewater can be controlled below 15mg / L, and the COD can be controlled below 100mg / L, but due to insufficient carbon source in the denitrification process, it cannot be achieved (GB16171-2012) Requirements for wastewater discharge TN≤50mg / L for new coking enterprises
A is adopted in Chinese patent 201210408185.0 2 O process combined with internal electrolysis + Fenton oxidation coagulation precipitation + activated carbon adsorption method to treat coking wastewater, but in the advanced treatment stage, concentrated H 2 SO 4 Control its pH to 2.5, at lower pH, H 2 SO 4 The dosage is large, and the pH of the effluent after treatment is low, and additional lye is required to restore it to a higher pH (8.5), and the waste of acid and alkali is serious
[0008] In summary, due to the high content of COD and ammonia nitrogen in coking wastewater, high toxicity, complex and changeable components, poor biodegradability, especially macromolecular refractory organic matter, the effluent quality is difficult to meet the current discharge standards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A: Biochemical treatment of coking wastewater:

[0038] A two-stage A / O process with staged water inflow, that is, anoxic-aerobic-anoxic-aerobic biological denitrification process, adopts the activated sludge method, and the activated sludge is inoculated with the sewage from the secondary sedimentation tank of the coking wastewater treatment plant. mud. First, the raw water of coking wastewater is pretreated in the pretreatment unit 1, that is, the temperature is kept at 38°C through a heat exchanger to adapt to the subsequent biological treatment, and then part of the oil contained in the wastewater is removed through the oil removal tank, and then The water quality is adjusted through the homogenizing tank to prevent the impact of the biochemical system caused by the violent fluctuation of the water quality. The bottom of the homogenizing tank is equipped with an aeration head. After aeration, some volatile toxic substances can be preliminarily removed, which is cond...

Embodiment 2

[0046] The experimental parameters in embodiment 2 and embodiment 3 are selected with reference to table 1.

[0047] After the above-mentioned biochemical treatment+advanced treatment of each embodiment, the main indicators of the effluent are shown in Table 2. Each embodiment of table 2 is to the removal effect of pollutant

[0048] From the results in Table 2, it can be seen that the coking wastewater after the above-mentioned biochemical treatment + advanced treatment has COD≤80mg / L, ammonia nitrogen≤10mg / L, and total nitrogen≤50mg / L. Emission Standard (GB16171-2012)" emission requirements.

[0049]

[0050] Table 1

[0051]

[0052] Table 2

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Abstract

The invention relates to a coking waste water joint-treatment process, which comprises a biochemical treatment process of coking waste water and an advanced treatment process of coking waste water. The biochemical treatment process of coking waste water adopts two-stage A / O process with segmented water inflow, namely, anoxic, aerobic, anoxic, aerobic biological denitrification process, all using activated sludge method, wherein activated sludge is inoculated from a second sedimentation tank of a coking waste water treatment plant. The advanced treatment process of the coking waste water adoptsthe sequencing batch operation.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment. It specifically relates to a process for joint treatment of coking wastewater, which is a waste water treatment process for efficiently reducing COD and denitrification through the combination of multi-stage water inflow A / O process combined with potassium ferrate and hydrogen peroxide. Background technique [0002] Coking wastewater is a typical industrial wastewater with complex components, high concentration of pollutants, and large chromaticity. In addition to high concentrations of ammonia nitrogen, it also contains many refractory fused-ring aromatics and heterocyclic compounds, such as indole, naphthalene, quinine, etc. The main sources are residual ammonia water produced in the process of coal dry distillation gas cooling, gas final cooling water and crude separation water produced in the process of gas purification. [0003] The water quantity and water quality of coking wastew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/34C02F101/16C02F101/32C02F101/30C02F101/38
CPCC02F1/40C02F1/5236C02F1/66C02F1/722C02F1/725C02F3/02C02F3/121C02F3/28C02F3/286C02F3/30C02F9/00C02F2101/16C02F2101/30C02F2101/327C02F2101/38C02F2103/34
Inventor 姚宏田盛孙斌李欢
Owner BEIJING JIAOTONG UNIV
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