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Nitration denitrificatoin and filter method for double-sludge series-connection aeration biofilter, and nitration denitrification and filter device

A biological aeration filter, nitrification and denitrification technology, applied in the field of biological sewage treatment, can solve the problems of heterotrophic bacteria population structure susceptible to backwashing, no phosphorus removal effect, and reduced suspended solid concentration, etc., and achieve oxygen mass transfer. High efficiency and utilization rate, deep denitrification and suspended solids removal, and the effect of reducing hydraulic retention time

Active Publication Date: 2013-07-10
北控水务(中国)投资有限公司
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Problems solved by technology

[0004] The main defect of the traditional one-piece or two-stage biological aerated filter is that the fillers such as pebbles or ceramsite are easy to block and harden, and the energy consumption of backwashing is very high
With the rapid interception of pollutants in the filter bed during operation, the biofilm on the lower filler grows rapidly, the porosity of the filter bed will decrease rapidly, the water head loss will increase rapidly, the working cycle will be short, and there will be almost no phosphorus removal effect, etc. question
Increasing the chemical pretreatment process can effectively control the quality of influent water, thereby reducing the number of backwashing, but chemical coagulation reduces the concentration of suspended solids and is accompanied by the removal of about 50% of COD, reducing the carbon source required for biological denitrification, which is not suitable Low C / N water quality is common in my country, and this method will also produce a large amount of chemical sludge that pollutes the environment. At the same time, the population structure of heterotrophic bacteria and autotrophic bacteria is easily affected by backwashing

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  • Nitration denitrificatoin and filter method for double-sludge series-connection aeration biofilter, and nitration denitrification and filter device

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Embodiment

[0047] Taking domestic sewage from a septic tank in a residential area as the treatment object, the hydraulic load of the device is 0.8m 3 / m 2 h, HRT=5h, the main water quality indicators of influent are: COD=210~355mg / L, NH 4 + -N=55~75mg / L, TN=60~85mg / L, pH=7~8, BOD / COD around 0.5, test temperature 18~20℃. System to COD, NH 4 + - The average removal rate of N and TN reaches 85%, 95% and 75% respectively, the dissolved oxygen in the effluent of the second biological aerated filter is 3-4mg / L, and the backwash cycle of the biological aerated filter under the test conditions is average up to 15d. However, the dissolved oxygen in the effluent of the traditional biological aerated filter process is 5-7mg / L, and the backwash cycle is generally 2 days, so as to achieve the purpose of saving energy, reducing consumption and increasing water production.

[0048] The TN of the domestic sewage received by the actual sewage treatment plant is in the range of 30-50mg / L. After bein...

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Abstract

The invention discloses a nitration denitrificatoin and filter method and a nitration denitrification and filter device for a double-sludge series-connection aeration biofilter. The nitration denitrification and filter device is mainly composed of a water inlet system, a first section aeration biofilter, a second section aeration biofilter and a clean water tank, wherein the first section aeration biofilter is divided into a denitrification zone and a decarburization zone, suspended biological carriers serving as fillers are arranged in the denitrification zone, the second section aeration biofilter is connected with the decarburization zone of the first section aeration biofilter through a gas-water separator arranged in a middle water layer, and the second section aeration biofilter is divided into a nitration zone and a nitration deoxidization filter zone. The nitration denitrification and filter method comprises that denitrification and aerobic decarburization of waste water are respectively achieved through the denitrification zone and the decarburization zone of the first section aeration biofilter, ammonia nitrogen is converted into nitrate nitrogen through the second section aeration biofilter, electron acceptors are provided for the denitrification zone of the first section aeration biofilter, and chemical oxygen demand (COD), nitrogen (N) and suspended solid (SS) areremoved. The system nitration denitrificatoin and filter method and the nitration denitrification and filter device for the double-sludge series-connection aeration biofilter can achieve function separation of denitrification, decarburization and nitration and have the advantages of saving energy, being stable and denitrifying efficiently.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and is particularly suitable for upgrading sewage treatment plants and building new sewage advanced treatment plants, and specifically relates to a method and device for sewage treatment with double sludge series BAF nitrification, denitrification and filtration . Background technique [0002] Due to the impact of influent water quality and quantity in the activated sludge treatment system, sludge bulking and sludge floating in the secondary sedimentation tank often occur, which affects the normal operation of the process. At present, a large number of researches have been carried out on the biological aerated filter at home and abroad, and it is pointed out that the biological aerated filter can be used as an alternative technology for the treatment of activated sludge. [0003] Biological Aerated Filter (BAF) is a sewage treatment technology that integrates the functions of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
Inventor 彭永臻张为堂王淑莹
Owner 北控水务(中国)投资有限公司
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