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Novel process for pretreating carbendazim wastewater

A carbendazim and new process technology, which is applied in the new process field of pretreatment of carbendazim pesticide production wastewater, can solve problems such as incomplete sedimentation and centrifugation, high ammonia nitrogen concentration, and increased difficulty in biochemical treatment.

Inactive Publication Date: 2010-02-03
XINYI AGRI CHEM PLANT JIANGSU PROV
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Problems solved by technology

The disadvantage of this treatment method is: the carbendazim product in the process is centrifuged and dehydrated by a centrifuge, the residual carbendazim particles in the wastewater are relatively fine, the sedimentation and centrifugation are not complete, and the concentration of ammonia nitrogen is high, which will affect the subsequent biochemical process. Dealing with increased difficulty

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  • Novel process for pretreating carbendazim wastewater
  • Novel process for pretreating carbendazim wastewater

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Embodiment Construction

[0005] see figure 1 , the treatment process of the present invention mainly adopts the following process steps: 1, adjust the pH value to 11 in the neutralization tank with lye for concentrated waste water; 2, utilize compressed air to blow out ammonia in the stripping tower; 3, blow ammonia 4. Put the remaining waste water into the waste water storage tank; 5. Then put the waste water into the extraction kettle and extract it with hydrochloric acid and extractant; 6. Finally, use a centrifuge to separate the solid Carbendazim complex; 7. Wastewater is sent to the environmental protection workshop for biochemical treatment. After being treated by the new process of the invention, the color of the waste water becomes lighter, and the biochemical property is obviously improved, and it is transported to the environmental protection workshop through pipelines for biochemical treatment and discharged up to the standard. The solid carbendazim complex obtained in step 6 has medicina...

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Abstract

The invention provides a novel process for pretreating carbendazim wastewater, which relates to a pretreatment technique of carbendazim pesticide production wastewater. The process comprises the following steps: 1, adjusting the pH value of concentrated wastewater to 11 by lye in a neutralization tank; 2, blowing out ammonia in a stripping tower by using compressed air; 3, blowing the ammonia to afalling film recovery tower and an aqua ammonia circulating tower for recycling; 4, feeding the residual wastewater in a wastewater storage tank; 5, feeding the wastewater in an extraction kettle, and extracting the wastewater by hydrochloric acid and extracting agent; 6, separating a solid carbendazim complex by a centrifugal machine; and 7, sending the wastewater to an environment-friendly workshop for a biochemical treatment. The process ensures that the COD removal rate, the ammonia nitrogen removal rate and the wastewater removal rate of the wastewater treatment process are improved greatly.

Description

Technical field: [0001] The invention relates to a new pretreatment process for carbendazim pesticide production wastewater. Background technique: [0002] Carbendazim is a broad-spectrum, high-efficiency, low-toxic fungicide, mainly used for vegetable anthracnose, powdery mildew of melons, common diseases of apples, citrus, and pears, and can be used for textiles, paper, leather, etc. , antisepsis and fruit preservation. The domestic and foreign market demand is 30,000 tons / year. Carbendazim products produce process wastewater in the condensation, centrifugation, and dehydration processes. The main components are water, a small amount of carbendazim and ammonia nitrogen (NH3-N), and all the generated wastewater is treated. The common pretreatment process of this wastewater is: sedimentation - filtration - stripping - biochemical treatment. Precipitation filtration mainly removes the carbendazim product, blows off the ammonia nitrogen in the wastewater, and then enters th...

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Application Information

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IPC IPC(8): C02F9/14C02F1/66C02F1/20C02F1/26C02F1/38C02F103/36
Inventor 梁华中
Owner XINYI AGRI CHEM PLANT JIANGSU PROV
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