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Recently, the magnetic Fenton advanced oxidation process of the Guang'an Xinqiao Chemical Park sewage treatment project provided by Geemblue has a stable effluent COD of less than 30mg/L and a stable effluent total phosphorus of less than 0.3mg/L , and passed the acceptance with high standards.
1. Project Overview
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Project Name |
Guang'an Xinqiao Chemical Park Wastewater Treatment Project Phase II |
|
Processing scale |
20,000 m3/day, with a total investment of 223 million RMB and an area of about 70 acres |
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Core Technology |
Pretreatment → hydrolysis and acidification → integrated biological pool → magnetic Fenton system →V-type filter basin → activated carbon filter basin→ disinfection and discharge |
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Emission standards |
"Pollutant Discharge Standard for Urban Sewage Treatment Plants" Level A standard, (COD ≤ 50 mg/L, TP ≤ 0.5 mg/L) |
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Operating Unit |
Beijing Enterprises Water Group |
2. The wastewater in the park is mainly organophosphorus pesticide wastewater, which is difficult to treat
The wastewater in the park is mainly organophosphorus pesticide wastewater (accounting for 90%), and the main polluting enterprises is the two Chemical industries. Due to the different pretreatment processes of the enterprises, the total phosphorus structure of the two wastewaters is also different.
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enterprise |
Waste water characteristics |
Pretreatment process |
|
Chemical industry 1 |
The proportion of total phosphorus and organic phosphorus is relatively high, and the water quality fluctuates greatly |
Conventional pretreatment: anaerobic + aerobic + AO |
|
Chemical industry 2 |
The proportion of total phosphorus and organic phosphorus is relatively low, making treatment difficult |
Ozone pretreatment + anaerobic + aerobic + ultrafiltration + nanofiltration |
With the increase in the amount of high-phosphorus wastewater, the original sewage treatment system can stably meet the discharge requirements for COD, BOD, NH3-N, and TN, but the pressure to meet the effluent standards for total phosphorus is gradually increasing. The main reason is that most of the total phosphorus is organic phosphorus, and the original process system cannot effectively convert organic phosphorus. Therefore, new chemical phosphorus removal measures are needed.
3. Technical demonstration of phosphorus removal process
The sewage treatment plant and its technical unit jointly carried out an on-site pilot test to systematically evaluate the phosphorus removal efficiency of activated carbon adsorption, ozone and Fenton.
|
Technical route |
TP removal effect |
Core conclusion |
|
Activated carbon |
↓ of activated carbon alone is not obvious, while that of activated carbon + flocculant is more obvious, but still does not meet the effluent standard. |
Activated carbon has poor direct adsorption capacity for organic phosphorus, and TP removal mainly relies on flocculation and sedimentation, which cannot achieve deep phosphorus removal. |
|
ozone |
Chemical industry 1 Wastewater TP ↓ <40%; Chemical industry 2 wastewater TP ↓ <20%; |
Ozone can oxidize some organic phosphorus, but has little effect on organic phosphorus that has been pretreated by ozone. |
|
Fenton |
TP ↓ >90%, effluent TP can be stabilized <0.5mg/L |
through hydroxyl radical oxidation + Fe 3+ flocculation adsorption |
Pilot tests have shown that Fenton is the best choice for deep phosphorus removal from organic phosphorus wastewater.
4. Hardcore Upgrade - Fenton 2.0 to Fenton 3.0
After the project was further designed, Fenton 3.0 - Magnetic Fenton was adopted. Compared with the Fenton 2.0 - Fluidized Bed Fenton (with the distinctive feature that media must be used in conjunction), the hard-core upgrades were made as below:
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Energy saving and carbon reduction |
Magnetic Fenton does not need to use a reflux pump. By removing all reflux pumps (single unit power 55kw), power consumption is reduced by 0.017 usd/m3 of water |
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Media requirements |
Magnetic Fenton does not require the use of media (quartz sand or iron carbon) |
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Area |
Magnetic Fenton does not need a matching crystal temporary storage room, saving about 50 square meters |
|
reliability |
The magnetic Fenton reactor is trouble-free and does not require ladders, escalators or operating platforms. |
5. Operational Results:
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Extreme phosphorus removal |
Influent TP 1.4mg/L → effluent <0.3mg/L (removal rate > 80%) |
|
Outlet COD |
Stable < 30mg/L |
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Cost reduction |
The reagent consumption is 40% lower than that of fluidized bed Fenton |
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Flexible operation |
Magnetic Fenton can be started and stopped in anytime, but fluidized bed Fenton will be blocked when it stops. |
|
Smart Operation and Maintenance |
zero reactor failure , greatly reducing on-site operation pressure |
6. Project Summary: A New Paradigm for High-Phosphorus Wastewater Treatment
The second phase of the Guang'an Xinqiao Chemical Park sewage treatment project passed the acceptance inspection with high standards, marking a replicable breakthrough in magnetic Fenton 's high-phosphorus wastewater treatment. The technology reconstructs the Fenton process standards with the four core advantages of " zero media, ultra-low operating costs, zero reactor failures, and fully automatic operation ". It has been applied on a large scale in wastewater from the papermaking, printing and dyeing, pharmaceutical and other industries, and has become a technical model for new quality productivity to empower environmental protection upgrades.
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