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Technology for anaerobic treatment of high concentration desizing wastewater through utilizing pulverized fuel ash

A technology for desizing wastewater and anaerobic treatment, applied in anaerobic digestion treatment, aerobic and anaerobic process treatment, water/sewage multi-stage treatment, etc. The effect of reducing production, facilitating implementation and popularization

Active Publication Date: 2014-04-16
HUAFANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microorganisms are mainly filamentous bacteria and bacilli. It is difficult to form activated sludge with good sedimentation performance when anaerobic treatment of desizing wastewater alone. The residence time is as long as 15 days. The removal rate of soluble COD is less than 50%, and the removal rate of COD is low.
Moreover, the effluent often contains a large number of suspended particles, and the apparent COD is as high as 15000mg / l
The standard discharge of printing and dyeing wastewater depends on physical and chemical treatment, which has become the bottleneck of printing and dyeing wastewater treatment

Method used

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  • Technology for anaerobic treatment of high concentration desizing wastewater through utilizing pulverized fuel ash

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Before the desizing wastewater is discharged into the anaerobic tank, the fly ash and anaerobic effluent are mixed according to the mass ratio of fly ash: anaerobic effluent is 5:95, fully stirred, floating beads are removed, and the fly ash is adsorbed and saturated After the surface is covered by anaerobic bacteria, the mixed solution is pumped into the pulse tank and put into the anaerobic internal circulation reactor. At the same time, industrial glucose with a COD concentration of 2% is added to the mixed solution, and the water temperature is controlled at 35±2°C. The hydraulic retention time of oxygen is 5 days, and the ascending velocity is 6m / h.

[0016] The effluent of the anaerobic internal circulation reactor and the aerobic nitrification liquid discharged from the aerobic tank are discharged into the intermittent anoxic tank. The aeration method of the anoxic tank is microporous aeration, and the hydraulic retention time is 2-2.5 days. The supernatant in th...

Embodiment 2

[0022] Before the desizing wastewater is discharged into the anaerobic tank, the fly ash and the anaerobic effluent are mixed according to the ratio of fly ash: anaerobic effluent is 4: 96 by weight, fully stirred, and the floating beads are removed, and the fly ash is adsorbed and saturated After the surface is covered by anaerobic bacteria, the mixed solution is pumped into the pulse tank and put into the anaerobic internal circulation reactor. At the same time, industrial glucose with a COD concentration of 2% is added to the mixed solution, and the water temperature is controlled at 38±2°C. The hydraulic retention time of oxygen is 6 days, and the ascending velocity is 8m / h.

[0023] The effluent from the anaerobic internal circulation reactor and the aerobic nitrification liquid discharged from the aerobic tank are jointly discharged into the intermittent anoxic tank. The supernatant in the anoxic tank is discharged into the aerobic tank, and the remaining sludge in the a...

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Abstract

The invention relates to a technology for the anaerobic treatment of high concentration desizing wastewater through utilizing pulverized fuel ash. The technology is that before the desizing wastewater is discharged into an anaerobic tank, the pulverized fuel ash and anaerobic water are mixed with each other according to a certain ratio and are fully stirred to remove floating beads, after the pulverized fuel ash adsorbs to be saturate and is covered by anaerobic bacteria, the mixed liquid is put into an internal circulation anaerobic reactor through a pump pulse tank, the outlet water of the anaerobic reactor and a nitrified liquid which is discharged by the aerobiotic tank are commonly discharged into an intermittent anoxic tank, supernatant in the anoxic tank is discharged into the aerobiotic tank, the residual sludge in the anaerobic tank is discharged into a continuous stirred tank reactor (CSTR) anaerobic digester, the supernatant in the CSTR anaerobic digester is discharged back to the intermittent anoxic tank, the residual sludge in the CSTR anaerobic digester is discharged into a filter press to be dehydrated, and water in the aerobiotic tank is discharged outside after the chemical oxygen demand (COD) reaches the standard. By the technology, the settling property of the settling sludge is obviously improved, the COD removal rate is increased, and the residual sludge yield is reduced; and moreover, the engineering is easy to carry out, the operation cost is low, and the technology is convenient to popularize and apply.

Description

technical field [0001] The invention relates to the field of refractory biodegradable industrial wastewater treatment, in particular to a process for anaerobic treatment of high-concentration desizing wastewater by using fly ash. Background technique [0002] The COD concentration of the desizing wastewater in the printing and dyeing wastewater is as high as 20g / l or more, and the main pollutants are PVA, carboxymethyl cellulose, surfactants and fabric hairs. The water quality is single and the degradability is poor. The sulfate radical content in the desizing wastewater is generally 3-5g / l, and the alkali content is relatively high, generally 3-5g / l. The microorganisms are mainly filamentous bacteria and bacilli. It is difficult to form activated sludge with good sedimentation performance when desizing wastewater is treated anaerobically alone. The residence time is as long as 15 days. The removal rate of soluble COD is less than 50%, and the removal rate of COD is low. Mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/28C02F3/30
CPCY02E50/30
Inventor 王力民罗维新孙国庆韩其儒李志海李春光周新民张炳营刘新利赵奇生
Owner HUAFANG