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Treatment method of domestic sewage

A treatment method and domestic sewage technology, applied in biological water/sewage treatment, water/sludge/sewage treatment, water treatment parameter control, etc., can solve problems such as low denitrification rate and control process

Active Publication Date: 2018-11-30
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These processes utilize the combined operation mode of aerobic-facultative oxygen (anoxic). In the anoxic process, denitrifying bacteria are used to remove nitrogen, which reduces the discharge of nitrogen in sewage. However, there are still many disadvantages in the existing processes. The innovation of the process only changes the parameters from the engineering point of view, lacks in-depth research on the biological factors in the system, and fails to regulate the process from the perspective of microorganisms, and the removal rate of the above-mentioned processes for nitrogen in sewage can only reach 55-60%. Nitrogen rates are still low

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Experimental program
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Embodiment 1

[0037] The initial content of COD in domestic sewage is 400mg / L, the initial content of total nitrogen is 40mg / L, and the initial content of SS is 200mg / L;

[0038] Domestic sewage is preliminarily treated by grating and sedimentation;

[0039] The preliminarily treated domestic sewage enters the anaerobic-aerobic integrated membrane bioreactor (hereinafter referred to as AOMBR) for anaerobic-aerobic circulation treatment, and the membrane filaments filled in the reactor are hollow fiber membranes containing quinone groups;

[0040] The sludge concentration in the AOMBR reactor was 4g / L; the AOMBR was operated according to the following parameters: no aeration during the anaerobic treatment, hydraulic stirring for 60 minutes, and redox potential of -50mv; Gas, no stirring, dissolved oxygen is controlled at 3mg / L, the aerobic treatment process is effluent through the membrane silk; the hydraulic retention time HRT is 5h, and then the waste water is discharged up to the standard...

Embodiment 2

[0046] The initial content of COD in domestic sewage is 320mg / L, the initial content of ammonia nitrogen is 62mg / L, and the initial content of SS is 85mg / L;

[0047] Domestic sewage is preliminarily treated by grating and sedimentation;

[0048] The preliminarily treated domestic sewage enters the anaerobic-aerobic integrated membrane bioreactor (hereinafter referred to as AOMBR), and the membrane filaments filled in the reactor are hollow fiber membranes containing quinone groups;

[0049] The sludge concentration in the AOMBR reactor was 6g / L; the AOMBR was operated according to the following parameters: no aeration in the anaerobic treatment process, hydraulic stirring for 60min, redox potential of -20mv; then aerobic treatment for 30min, aerobic treatment process Gas, no stirring, dissolved oxygen is controlled at 2.5mg / L, the aerobic treatment process is effluent through the membrane silk; the hydraulic retention time HRT is 5.5h, and then the waste water is discharged up...

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Abstract

The invention provides a treatment method of domestic sewage. The treatment method comprises the following steps: firstly, carrying out primary treatment on the domestic sewage through a grid and sediment to remove large-particle solid matters in the domestic sewage; conveying the domestic sewage subjected to the primary treatment into a membrane bioreactor and carrying out anaerobic-aerobic circulating treatment; in an aerobic treatment process, oxidizing nitrogen in the sewage into nitrite and nitrate through microorganisms; under an anaerobic condition, reducing the nitrate through denitrifying bacteria in the microorganisms, so as to realize molecular nitrogen or nitrous oxide. According to the treatment method, a hollow fiber membrane containing quinonyl is filled into the membrane bioreactor; in a microorganism denitrification process, the quinonyl can be used as an electron transfer vector to participate in a denitrification process and participate in and promote a reduction process of the nitrate (nitrite), and the denitrification speed is improved under an anaerobic condition, so that the efficient denitrification aim is realized.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating domestic sewage. Background technique [0002] Domestic sewage is the waste water discharged from the daily life of residents, mainly from residential buildings and public buildings, such as residences, institutions, schools, hospitals, shops, public places and toilets of industrial enterprises. The pollutants contained in domestic sewage are mainly organic matter (such as protein, carbohydrates, fat, urea, ammonia nitrogen, etc.) and a large number of pathogenic microorganisms (such as parasite eggs and intestinal infection viruses, etc.). The conventional biochemical treatment process can effectively reduce the COD, BOD and SS of sewage, but it can generally only remove 10% to 20% of the N co-existing in the sewage, and a large amount of nitrogen-containing sewage is discharged into the water body, which is an important water source, , one of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F101/16
CPCC02F3/1268C02F3/2853C02F3/301C02F2101/16C02F2101/166C02F2101/163B01D2325/02834Y02W10/10C02F2209/10C02F2209/04C02F2209/44C02F2209/20C02F3/305C02F3/1273B01D2311/2688B01D2315/06B01D61/14B01D69/02B01D69/08B01D71/06C02F1/001
Inventor 严滨
Owner XIAMEN UNIV OF TECH
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