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Chemical fertilizer waste water treatment method

A wastewater treatment and fertilizer technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the large difference in the control of different process parameters, and many restrictions on wastewater treatment process management and other problems, to achieve the effects of shock load resistance, cost saving, and cost saving

Active Publication Date: 2010-06-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many restrictions on wastewater treatment process management, and the control of different water quality and process parameters is quite different, resulting in many processes not operating in the best state

Method used

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  • Chemical fertilizer waste water treatment method
  • Chemical fertilizer waste water treatment method
  • Chemical fertilizer waste water treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] After being mixed by air blowing and aeration in the adjustment tank, the wastewater indicators of the fertilizer plant: CODcr=1000-1200mg / L, SS=200mg / L, NH 3 -N=200-300mg / L, pH=6~9. The incoming water from the regulating pool includes high-ammonia-nitrogen fertilizer wastewater from chemical fertilizer plants and organic production wastewater. The load of the regulating pool is configured according to the treatment capacity and the discharge of production wastewater, and the excess wastewater is temporarily stored in the emergency pool. The continuous water distribution method is adopted, and the ammonia nitrogen wastewater and organic wastewater are distributed into the regulating tank according to the flow ratio of 4:1, and the treatment capacity is 120m 3 / h.

[0029] The homogenized wastewater is pumped into the blast aeration complete mixing primary aeration tank to keep the dissolved oxygen at about 1.5mg / L, which can initially remove COD and maintain the remain...

Embodiment 2

[0034]After being mixed by blowing and aerating in the adjustment tank, the wastewater indicators of the fertilizer plant: COD=100-300mg / L, SS=50-100mg / L, NH 3 - N = 100-200 mg / L. The incoming water from the regulating pool includes high-ammonia-nitrogen fertilizer wastewater from chemical fertilizer plants and organic production wastewater. In an accident state, the concentration of organic wastewater is ultra-low, and the organic load of the entire system is reduced. The continuous water distribution method is adopted, and the ammonia nitrogen wastewater and organic wastewater are respectively distributed into the regulating tank, and the treatment capacity is 150m 3 / h.

[0035] The high-ammonia-nitrogen fertilizer wastewater from the chemical fertilizer plant is mixed evenly by blowing aeration in the regulating tank, and the residence time is 3 hours. The homogenized wastewater is pumped into the primary aeration tank, the dissolved oxygen is adjusted to 0.8mg / L, the co...

Embodiment 3

[0039] After being mixed by blowing and aerating in the adjustment tank, the wastewater indicators of the fertilizer plant: COD=600-1000mg / L, SS=50-100mg / L, NH 3 -N=100-200 mg / L, phenols=50 mg / L. The incoming water from the regulating pool includes high-ammonia-nitrogen fertilizer wastewater from chemical fertilizer plants and organic production wastewater. The load of the regulating pool is configured according to the treatment capacity and the discharge of production wastewater, and the excess wastewater is temporarily stored in the emergency pool. The continuous water distribution method is adopted, and the ammonia nitrogen wastewater and organic wastewater are respectively distributed into the regulating tank, and the treatment capacity is 120m 3 / h.

[0040] The homogenized wastewater is pumped into the primary aeration tank. In order to effectively remove phenolic substances and remove toxic and side effects for the subsequent biological denitrification unit, the dissol...

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Abstract

The invention provides a chemical fertilizer waste water treatment process control method. The process comprises the following steps of: homogenizing chemical fertilizer waste water through a regulating pool; then pumping the waste water in the regulating pool into a primary aeration tank by utilizing a sewage pump so as to primarily remove COD (chemical oxygen demand) and relieve toxic and side effects for a subsequent biological and chemical system; after the waste water is treated by a primary sedimentation tank, ensuring that the waste water enters an A / O (anacrobic / oxic) biological denitrification system and a subsequent materialization deep treatment system; keeping DO (dissolved oxygen) of a pool A (anoxia pool) being below 0.5mg / L and the water flow of nitration liquid refluxing from a pool O (oxic pool) being 3-5 times of that of inlet water; maintaining the pH of the pool O to be 6.5-8.5 and the DO to be 2-3mg / L; and regulating to a proper mud reflux ratio so as to ensure that the biological and chemical system can be efficiently and stably operated. The materialization deep treatment system is used for adding flocculating agents PAC (polyaluminium chloride) and PAM (polyacrylamide), and after reaction and precipitation, outlet water can reach the national first-level discharge standard.

Description

technical field [0001] The invention relates to a method for treating chemical fertilizer wastewater, in particular to a treatment process control method for high-concentration ammonia nitrogen fertilizer wastewater. Background technique [0002] In chemical fertilizer wastewater, the concentration of ammonia nitrogen is extremely high and the carbon source is relatively insufficient, which is a technical problem in its treatment. For denitrification technology, it is generally believed that biochemical treatment is the most economical and effective technology. Traditional biological denitrification technologies mainly include A / O method, A / A / O method, etc. These processes can remove COD and ammonia nitrogen, but they are more suitable for urban sewage, and the effect is not good for high-concentration fertilizer wastewater. The reason is the limitation of growth conditions of nitrifying bacteria, too long sludge age, and limitation of influent load. Nitrifying bacteria ha...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/30C02F1/52
Inventor 周少奇冯平
Owner SOUTH CHINA UNIV OF TECH
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