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A water purifying agent suitable for advanced treatment of coal chemical and coking industrial wastewater

A technology for industrial wastewater and advanced treatment, applied in aerobic process treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc. The effect of reducing CODcr, improving treatment efficiency and enhancing decolorization effect

Active Publication Date: 2020-01-10
江苏建霖环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing advanced treatment, there are several common methods for removing CODcr and chroma by dosing: (1) directly adding water purification materials, such as polyaluminum chloride, polyferric sulfate, M180 and other flocculants, which have a single effect , the removal efficiency of CODcr is low, and the decolorization rate is poor. Generally, when the CODcr value of the biochemical effluent of the secondary sedimentation tank is greater than 200mg / L, the new GB16171-2012 "Coking Chemical Industry Pollutant Discharge Standard" cannot be reached after adding such flocculants Emission standards in Table 2 and Table 3
(2) Fenton's method: usually add concentrated sulfuric acid to adjust the pH value to 4-6, then add Fenton's reagent ferrous sulfate and hydrogen peroxide, and adjust the pH by sodium hydroxide (or calcium hydroxide), and finally add PAM For flocculation and sedimentation, this type of dosing method is complicated to operate, and some chemicals are highly dangerous, and affected by changes in water quality and water volume, it is difficult for the system to operate stably
(3) Dosing of ozone: A large number of on-site cases have shown that the removal of CODcr and chroma is not effective after adding such advanced oxidants to wastewater such as coking and coal chemical industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A water purifying agent suitable for advanced treatment of coal chemical industry and coking industrial wastewater. 22 parts by weight of nano-carbon materials, 2 parts by weight of diatomaceous earth powder and 2.5 parts by weight of extracts of coking aerobic pool bacteria are mixed in proportion. Dry at 105-110°C until the water content is less than 5%, put it into a ball mill to grind to 200-300 mesh, and fully stir and mix with 63 parts by weight of special flocculant before packing in separate bags; the special flocculant is produced by Potassium aluminum sulfate dodecahydrate or aluminum sulfate, polyferric sulfate, and tertiary ammonium salt polymer flocculant are mixed according to the mass ratio of 90:9.5:0.5.

[0021] When in use, pour 0.6g of the water purifying agent into 1L of waste water to be treated with aeration and stirring for 4 hours, and let it stand for 3 hours. The CODcr removal rate is determined to be 80%, and the decolorization rate is 85%.

Embodiment 2

[0023] A water purifying agent suitable for the advanced treatment of coal chemical industry and coking industrial wastewater. 28 parts by weight of nano-carbon materials, 6 parts by weight of diatomaceous earth powder and 3.6 parts by weight of coking aerobic pool strain extracts are mixed in proportion. Dry at 105-110°C until the water content is less than 5%, put it into a ball mill to grind to 200-300 mesh, and fully stir and mix with 63 parts by weight of special flocculant before packing in separate bags; the special flocculant is produced by Potassium aluminum sulfate dodecahydrate or aluminum sulfate, polyferric sulfate, and tertiary ammonium salt polymer flocculant are mixed and compounded according to the mass ratio of 95:4.5:0.5.

[0024] Nano-carbon material is processed as follows: 1 weight part of nano-carbon material is added to 2 weight parts of H 3 PO 4 Soaking in the solution (concentration: 30%) for 12 hours; then filtering, washing and drying to obtain a m...

Embodiment 3

[0027] A water purifying agent suitable for the advanced treatment of coal chemical industry and coking industrial wastewater. 31 parts by weight of nano-carbon materials, 4.5 parts by weight of diatomaceous earth powder and 3.6 parts by weight of coking aerobic pool strain extracts are mixed in proportion, and tested Dry at 105-110°C until the water content is less than 5%, put it into a ball mill to grind to 200-300 mesh, and fully stir and mix with 68 parts by weight of special flocculant before packing in separate bags; the special flocculant is produced by Potassium aluminum sulfate dodecahydrate or aluminum sulfate, polyferric sulfate, and tertiary ammonium salt polymer flocculant are mixed and compounded according to the mass ratio of 94:5:1.

[0028] Nano-carbon material is processed as follows: 1 weight part of nano-carbon material is added to 3 weight parts of H 3 PO 4 soaking in the solution (concentration is 30%) for 18 hours; then filtering, washing and drying to...

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PUM

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Abstract

The invention provides a water purifying agent suitable for the advanced treatment of industrial wastewater produced by coal chemical industry and coking. The water purifying agent is prepared from the following components in parts by weight: 20-35 parts of a carbon nanomaterial, 0-10 parts of kieselguhr powder, 60-75 parts of a special flocculating agent and 2-8 parts of a coking aerobic pond strain extract. The poisonous and harmful heavy metal elements are not added into the water purifying agent, so that the water purifying agent is green and free from pollution; the water purifying agent improves the decoloration effect while increasing the flocculation effect, and increases the treatment efficiency. Tests prove that after the water purifying agent is added into the effluent, subjected to biochemical treatment, of a secondary sedimentation tank, the CODcr removal rate reaches 85% or above, and the decolorization rate reaches 90% or above; therefore, the CODcr and chroma of the final treated effluent are enabled to meet the water pollutant concentration emission limits of a table 2 and a table 3 in (GB16171-2012) Coking Chemical Industry Pollutant Discharge Standard.

Description

technical field [0001] The invention relates to a water purifying agent, in particular to a water purifying agent suitable for advanced treatment of coal chemical and coking industrial wastewater. Background technique [0002] High-concentration industrial wastewater such as coking and coal chemical industry contains a large amount of refractory organic matter (such as polycyclic aromatic hydrocarbons and heterocyclic compounds, etc.). At this time, CODcr is difficult to degrade or remove, so it is difficult to meet the requirements of CODcr in the discharge standard, and the darker color also seriously affects the sensory effect of the water body. In this regard, it is necessary to do further advanced treatment on the wastewater after biochemical treatment. In the existing advanced treatment, there are several common methods for removing CODcr and chroma by dosing: (1) directly adding water purification materials, such as polyaluminum chloride, polyferric sulfate, M180 and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C02F3/02
CPCC02F3/02C02F3/34Y02W10/10
Inventor 张清
Owner 江苏建霖环保科技有限公司