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Process and device for efficiently treating wheat straw pulp intermediate wastewater by alkaline method

A technology for wheat straw pulp and wastewater, which is applied in the process of wastewater treatment, water/sewage multi-stage treatment, oxidized water/sewage treatment, etc. The effect of sludge treatment cost, less sludge output and low cost

Active Publication Date: 2012-01-25
山东绿泉环保科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies of the traditional treatment method for middle stage wastewater of wheat straw pulp with low CODCr removal rate, extremely low AOX removal rate, high cost and high energy consumption, the purpose of the present invention is to provide a low operating cost, low energy consumption, COD Cr Wastewater treatment process and device with high and chromaticity removal rate, AOX removal and small sludge output

Method used

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  • Process and device for efficiently treating wheat straw pulp intermediate wastewater by alkaline method
  • Process and device for efficiently treating wheat straw pulp intermediate wastewater by alkaline method

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Example 1 :A device for realizing the middle-stage wastewater treatment process of wheat straw pulp by figure 1 As shown, it mainly includes a pretreatment device 1, a Fenton preoxidation device 2, an aerobic treatment device 3, and a coagulation precipitation treatment device 4. The pretreatment device 1, the Fenton preoxidation device 2, the aerobic treatment device 3 and the coagulation precipitation treatment device 4 are sequentially connected by pipelines.

[0042] The pretreatment device 1 mainly includes a fine grid 5, a collecting basin 6, and an inclined net 7. The fine grid 5, the collecting basin 6, and the inclined net 7 are connected by pipelines in sequence.

[0043] The Fenton pre-oxidation device 2 mainly includes a concentrated sulfuric acid storage tank 8, a pH adjustment tank 9, and FeSO 4 Dosing tank 10, H 2 O 2 Storage tank 11, Fenton oxidation tank 12, lye dosing device 13, neutralization tank 14 and primary sedimentation tank 15. The pH adjustment t...

Embodiment 2

[0052] Example 2: Except that the flocculant added in the coagulation sedimentation treatment step is polyferric sulfate (PFS), the dosage is 90mg / L. The coagulant aid is polyacrylamide (PAM), and the dosage is the same as in Example 1, except that the dosage is 2.5 mg / L.

Embodiment 3

[0053] Example 3: The device can still refer to Example 1 and Appendix figure 1 , Using its process to treat the middle-stage wastewater of alkaline wheat straw pulp, the steps are as follows:

[0054] (1) Wastewater pretreatment: remove the large floating suspended solids in the wastewater that can easily block pumps and pipelines, and recover longer fibers for comprehensive utilization;

[0055] (2) Pre-oxidation treatment: The pre-treated wastewater is adjusted to pH 3-5 with acid. Under the action of Fenton reagent, the organic matter is decomposed and most of COD is removed Cr And chromaticity, the effluent is added with alkali to adjust the pH to 6-7, then the suspended solids in the wastewater are removed under the action of the coagulant, and the pre-oxidation process is completed after solid-liquid separation;

[0056] (3) Aerobic biological treatment: the wastewater undergoes the adsorption, oxidation, and degradation of aerobic microorganisms to remove most of the organic ...

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Abstract

The invention discloses a process and equipment for efficiently treating wheat straw pulp intermediate wastewater by an alkaline method. The process comprises the following four steps: carrying out pretreatment, pre-oxidation, aerobic biological treatment and coagulating sedimentation on wastewater so that effluent reaching standard is discharged. According to the invention, a combined process comprising pretreatment, Fenton pre-oxidation, aerobic biological treatment and coagulating sedimentation is adopted, the treatment equipment has simple structure, high efficiency and good treatment effect, and is stable to operate; total CODCr (chemical oxygen demand Cr) removal rate is up to 95-97%, and total chroma removal rate reaches 95-99%; cost is low, thus energy is saved by above 40%; and the yield of sludge is less, thereby saving sludge treatment cost. By the treatment with the process and equipment, the final effluent can stably reach the requirement of 'water pollutant emission standard in pulp-producing paper-making industry (GB3544-2008)'.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a process and a device for treating wastewater in the middle section of wheat straw pulp. Background technique [0002] In recent years, the structure of papermaking raw materials in my country is changing, and the proportion of wood fiber and secondary fiber is increasing. However, according to the actual situation in our country, non-wood raw materials are still important papermaking raw materials in our country for a long time. Among the numerous non-wood fiber resources, wheat straw and rice straw account for 65-75% of the non-wood fiber resources. At present, most wheat straw pulp in my country still adopts CEH bleaching, that is, the traditional chlorine-containing bleaching agents such as chlorine gas and hypochlorite are used to bleach the pulp. Contains a large amount of highly toxic adsorbable organic chloride (AOX), causing serious pollution to water bo...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/72C02F1/52C02F103/28
Inventor 周焕祥房爱东宗可卿
Owner 山东绿泉环保科技股份有限公司
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