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Device and process for treating photovoltaic organic wastewater

A kind of organic wastewater and photovoltaic technology, applied in the direction of water/sewage multi-stage treatment, neutralized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem that the effluent quality is difficult to meet the discharge standard, and achieve the slowdown of membrane pollution Effect

Inactive Publication Date: 2014-03-05
SHANGHAI OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a photovoltaic organic wastewater treatment process and device with high efficiency, easy operation and low operating cost, aiming at overcoming the disadvantage that the effluent quality of the existing photovoltaic organic wastewater treatment technology is difficult to meet the discharge standard, and using accurate physicochemical Precipitation method to remove silicon powder and silicon carbide powder with high concentration and small particles, hydrolytic acidification-aerobic-MBR biological treatment, the treated photovoltaic organic wastewater COD<60mg / L

Method used

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  • Device and process for treating photovoltaic organic wastewater
  • Device and process for treating photovoltaic organic wastewater
  • Device and process for treating photovoltaic organic wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0041] (1) Photovoltaic organic wastewater enters the grid collection tank 1 for a residence time of 0.5 hours. After preliminary precipitation, the sludge obtained by the precipitation is pumped into the sludge tank 8, and the liquid is lifted into the regulating tank 2 by the pump, and the residence time is 6 hours. , The ventilation equipment ventilates the bottom of the pretreatment tank 203 to homogenize the wastewater;

[0042] (2) The wastewater in the adjustment tank is sent to the reaction tank 3 through a lift pump, and the pH is adjusted in turn, and the coagulation and flocculation reactions are carried out; alkali (NaOH) is added to the pH adjustment tank, and the pH value is adjusted to 8-9. The coagulant PAC is added to the tank, the coagulant PAM is added to the flocculation tank A, and the flocculation reaction is carried out in the flocculation tank B; the ratio of the dosage of the coagulant and the flocculant to the wastewater is 500mg / L; The residence time in...

Embodiment 2

[0060] A photovoltaic cell company 1320t / d photovoltaic organic wastewater treatment, design influent COD cr ≤3000mg / L; SS≤800mg / L, effluent quality COD cr ≤100mg / L; SS≤5mg / L.

[0061] The treatment process is the same as that of Example 1, the difference is that in step (1), the residence time in the grid sump (1) is 1 hour, the residence time in the adjustment tank is 7.5 hours; the sedimentation tank is an inclined plate sedimentation tank.

[0062] Among them, 10 sets of hollow fiber membrane modules of Zhejiang University Qiushi Membrane are used in the membrane reactor pool. After more than 3 years of operation, the effluent COD is stable below 100mg / L, SS is less than 5mg / L, and the membrane modules are cleaned once more than half a year on average. The effluent quality is stable and membrane pollution is effectively controlled. As shown in Table 3.

[0063] table 3

[0064]

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Abstract

The invention discloses a device and a process for treating photovoltaic organic wastewater. According to the process, the photovoltaic organic wastewater passes through a grid water collection tank and is lifted to an adjusting tank by a water pump; then the photovoltaic organic wastewater is lifted into a reaction tank; an alkali, a flocculating agent and a coagulant aid are added by a medicament adding system to carry out coagulation and flocculation reaction; then the wastewater flows into a sedimentation basin by gravity for removing suspended matters in the wastewater; then the wastewater enters a hydrolysis acidification tank and hydrolysis acidification of the wastewater is carried out to convert macromolecular organic matters into micro-molecular easily-degradable matters; after BOD (Biochemical Oxygen Demand) / COD (Chemical Oxygen Demand) is improved, the wastewater flows into a pre-aeration tank by the gravity to carry out aerobic microorganism degradation; mixed liquid flows into a membrane reactor tank and organic matters are further degraded; the mixed liquid is filtered by the membrane reactor tank and effluent is pumped; the effluent is discharged after reaching the standards. The sludge mixed liquid in the membrane reactor tank flows back to the hydrolysis acidification tank and the pre-aeration tank according to a certain ratio. Sludge and one part of the sludge mixed liquid in the sedimentation basin are discharged into a sludge tank; the dehydrated sludge contains a lot of silicon powder and silicon carbide powder and can be recycled or sold.

Description

Technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and relates to a treatment process method for photovoltaic organic wastewater treatment. Background technique [0002] In the production process of photovoltaic silicon cells, the wastewater mainly comes from cutting, grinding wastewater, cutting fluid black water, citric acid wastewater, cleaning agent wastewater, ultrasonic cleaning wastewater, and contains the cutting fluid used in mass production (the main component is polyethylene Diol and silicon carbide), cleaning agent, silicon powder, citric acid, etc. The wastewater contains a large amount of water, complex components, and large fluctuations in water quality. Especially the molecular weight of polyethylene glycol is large, and it is difficult to treat wastewater. . [0003] At present, the most commonly used treatment process in China is physicochemical precipitation + hydrolytic acidification (anaerobic) + aerobic tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/52C02F1/56C02F1/66C02F101/30
Inventor 冀世锋巢晨骅高春梅邢云青李迎陈思思胡茂刚
Owner SHANGHAI OCEAN UNIV
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