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Denitrification method for coking wastewater

A technology for coking wastewater and denitrification, applied in chemical instruments and methods, water pollutants, multi-stage water treatment, etc. The effect of land area and operation cost reduction

Inactive Publication Date: 2019-04-16
PINGXIANG HUAXING ENVIRONMENTAL PROTECTION ENG TECH CO LTD
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Problems solved by technology

[0013] The present invention provides a short-range nitrification-denitrification process for treating coking wastewater in order to solve the problems of large power consumption, high operating costs, long process flow, high investment, and the need to add carbon sources in the current coking wastewater denitrification process. method, which can effectively shorten the reaction process, reduce carbon source consumption, reduce power consumption, and reduce operating costs

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  • Denitrification method for coking wastewater

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Embodiment Construction

[0035] In order to further understand the present invention, the preferred embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only to further illustrate the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0036] The coking wastewater was taken from a large coking plant. The water quality is shown in Table 1. The pH value of the wastewater was adjusted by adding sulfuric acid and phosphoric acid, and phosphorus was added to adjust the nutrient composition of the wastewater according to C:N:P=200:50:1. The sludge is taken from the aeration tank of the coking wastewater biochemical treatment system, and it is statically settled for 30 minutes to remove the sludge with poor settling performance and suspended impurities.

[0037] The temperature is controlled at (35±1)°C, the dissolved oxygen is 2.0-3.0 mg / L, and the first-stage ae...

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Abstract

The invention provides a denitrification method for coking wastewater. The denitrification method for the coking wastewater comprises the steps that a coagulant and a demulsifier are added into the coking wastewater, sulfide and mineral oil in the coking wastewater are removed, then the coking wastewater is introduced into a partial nitrification tank, an anaerobic ammoxidation tank and an aerobicdecarbonization tank in sequence for a nitration reaction, denitrification and decarbonization, the treated coking wastewater is precipitated by a secondary sedimentation tank and separated into a supernatant and sludge, the sludge flows back to the partial nitrification tank, then the supernatant is introduced into a coagulative precipitation tank to be precipitated, a flocculating agent is added, suspended solids in a mixed solution are removed, finally, the denitrified coking wastewater is obtained, and the precipitated excess sludge is discharged from a discharge port in the bottom of thecoagulative precipitation tank. The denitrification method for the coking wastewater has the advantages that a method for treating the coking wastewater by adopting a partial nitrification-denitrification technology is adopted to effectively shorten the reaction mechanism, reduce the consumption of a carbon source, reduce the power consumption and reduce the operating cost.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a method for denitrification of coking wastewater. Background technique [0002] Coking wastewater has a complex composition, a large amount of water, and serious environmental pollution. In addition to inorganic compounds such as ammonia nitrogen, sulfide, and cyanide, water also contains monocyclic or polycyclic aromatic compounds such as phenol, naphthalene, pyridine, and quinoline, as well as heterocyclic organic pollutants containing nitrogen, sulfur, and oxygen. One of the difficult industrial wastewater. [0003] At present, the traditional technologies for coking wastewater treatment at home and abroad are mainly A / O or A 2 / O process, the denitrification mechanism is the whole process of nitrification and denitrification. This technology is to convert the ammonia nitrogen in the sewage into nitrogen through the process of nitrification and denitrification denit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/16C02F101/10C02F101/30
CPCC02F1/5236C02F1/56C02F3/302C02F9/00C02F2001/007C02F2101/101C02F2101/16C02F2101/166C02F2101/30C02F2301/08
Inventor 宁平王学谦王郎郎候建国李波李斌
Owner PINGXIANG HUAXING ENVIRONMENTAL PROTECTION ENG TECH CO LTD
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