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Lignin wastewater recycling technology

A technology of lignin and waste water, which is applied in the direction of waste water treatment, descaling and water softening, water/sewage treatment, etc. in the processing process. achieve a high degree of effect

Active Publication Date: 2016-03-30
NANJING JIUSI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If these treatment processes are used alone, there will still be lignin organic matter in the effluent, which will not meet the recycling standard, and the discharge will still pollute the environment to a certain extent

Method used

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  • Lignin wastewater recycling technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Wastewater from a paper mill needs to be reused as process water. The process flow chart is as follows figure 1. The volume of wastewater is 2000t / d, the water quality is BOD53254mg / L, CODCr is 13017mg / L, TDS is 2337mg / L, and lignin substance is 783mg / L. The effluent water quality after passing through the micro-electrolysis system is BOD53817mg / L, CODCr is 8237mg / L, and TDS is 2569mg / L. The B / C ratio of wastewater is increased from 0.25 to 0.47, that is, the biochemical properties of wastewater are converted from difficult biochemical treatment to good biodegradability, which is conducive to the efficient removal of COD by subsequent biochemical systems. After the effluent from the micro-electrolysis system passes through the biochemical system, the effluent quality is CODCr290mg / L, TDS is 2483mg / L, hardness is 635mg / L, SS is 188mg / L, and the removal rate of COD by the biochemical system reaches 96%. Due to the high COD, hardness, and SS of the effluent of the bioche...

Embodiment 2

[0027] Papermaking wastewater is reused as circulating cooling water, the process flow chart is as follows figure 1 . The volume of wastewater is 240t / d, the water quality is BOD5735.6mg / L, CODCr is 4327mg / L, TDS is 1275mg / L, and lignin is 180mg / L. The effluent water quality after passing through the micro-electrolysis system is BOD5971mg / L, CODCr is 2942mg / L, and TDS is 1338mg / L. The B / C ratio of wastewater is increased from 0.17 to 0.33, that is, the biochemical properties of wastewater are converted from unsuitable for biochemical treatment to biochemical treatment. After the micro-electrolysis system effluent passes through the biochemical system, the effluent water quality is CODCr86mg / L, TDS is 1174mg / L, hardness is 301mg / L, and SS is 175mg / L. Due to the high SS of the effluent of the biochemical system, the pre-membrane pretreatment system is set to air flotation and filter cloth filter. After the pre-membrane pretreatment system, the effluent water quality is CODCr57...

Embodiment 3

[0029] Pulping wastewater is reused as circulating cooling water, the process flow chart is as follows figure 1 . The volume of wastewater is 800t / d, the water quality is BOD52102mg / L, CODCr is 8083mg / L, TDS is 4589mg / L, and lignin is 672mg / L. The effluent water quality after passing through the micro-electrolysis system is BOD52036mg / L, CODCr is 5358mg / L, and TDS is 4634mg / L. The B / C ratio of wastewater is increased from 0.26 to 0.38, that is, the biochemical properties of wastewater are converted from difficult biochemical treatment to biochemical treatment. The effluent water quality of the micro-electrolysis system after passing through the biochemical system is CODCr157mg / L, TDS is 4418mg / L, hardness is 774mg / L, and SS is 235mg / L. Because the effluent hardness and SS of the biochemical system are high, the pre-membrane pretreatment system is set to softening, air flotation, and media filter. After the pre-membrane pretreatment system, the effluent quality is CODCr68mg / L...

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Abstract

The invention relates to a lignin wastewater recycling technology. A micro-electrolysis system, a biodegradation system, a membrane pretreatment system, a membrane treatment system and an evaporation system are adopted in the technology, wherein the micro-electrolysis system at least comprises a micro-electrolysis reaction and coagulating sedimentation, the biodegradation system at least comprises anaerobic and aerobic composite biodegradation, the membrane pretreatment system integrates multiple technologies selected according to effluent quality of the biodegradation system, and the membrane treatment system at least comprises ultrafiltration and reverse osmosis. The biodegradability of high-content lignin wastewater is improved by the micro-electrolysis system, effluent of the micro-electrolysis system enters the biodegradation system for removal of partial COD (chemical oxygen demand), the wastewater enters the membrane treatment system after the hardness, the COD and suspended solids are reduced again by the membrane pretreatment system, produced water of the membrane treatment system is deployed and recycled, and concentrated water enters the evaporation system for evaporative crystallization. The technology treats and recycles the high-content lignin wastewater, the pollution caused by the wastewater to the environment is reduced, and efficient recovery of the water resource is realized.

Description

technical field [0001] The invention relates to the treatment of organic waste water, and in particular to a lignin waste water reuse process. The technology not only reduces the environmental pollution caused by high-content lignin waste water, but also realizes the recovery of water resources, and the produced water meets the requirements of enterprise production allocation. Background technique [0002] Lignin mainly exists in woody plants and herbaceous plants, and also exists in all vascular plants. Lignin, cellulose and hemicellulose are the main components of the plant skeleton, and its quantity in nature is second only to Natural organic matter of cellulose. There are two types of lignin that enter the environment: one is the lignin produced by the wood hydrolysis industry, which is less in quantity and is better used abroad; the other is the lignin produced by the paper industry, which mainly exists in papermaking wastewater. The main pollutant in papermaking waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/28
CPCC02F1/001C02F1/04C02F1/24C02F1/42C02F1/441C02F1/444C02F1/461C02F1/52C02F1/66C02F1/78C02F3/00C02F5/00C02F9/00C02F2001/425C02F2103/28C02F2209/055C02F2209/08C02F2209/10C02F2305/026
Inventor 丁晓斌周利跃赵祥强南江普
Owner NANJING JIUSI HIGH TECH
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