Nitrification aerobic granular sludge culture method and application

A technology of aerobic granular sludge and cultivation method, which is applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., and can solve the problems of high cost, high cost of physical and chemical methods, secondary pollution, etc. , to achieve the effect of strong impact resistance, good settlement performance and high organic load

Inactive Publication Date: 2017-03-15
EAST CHINA JIAOTONG UNIVERSITY
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Problems solved by technology

As far as the existing treatment process is concerned, the most commonly used method is the chemical precipitation method. This method has a mature treatment process and is simple and easy to operate, but the dosage is large and the cost is relatively high. The metal ion precipitate after treatment is treated with chemical sludge. Existing in the form of sludge, the sludge is difficult to deal with, and it is easy to cause secondary pollution
Physicochemical methods are costly, complicated, and difficult to recover heavy metals, so they are often used to treat small-scale wastewater

Method used

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  • Nitrification aerobic granular sludge culture method and application
  • Nitrification aerobic granular sludge culture method and application
  • Nitrification aerobic granular sludge culture method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: the cultivation of nitrifying aerobic granular sludge

[0048] (1) Operation control of experimental device

[0049] The experimental setup of the SBR reactor is as follows: figure 1 shown. The SBR reactor has a total height of 100cm, an inner diameter of 7cm, and an effective volume of 2L. The drain is located at a distance of 26cm from the bottom of the reactor. The displacement is 1L, that is, the drainage ratio is 50%. There is an aeration head at the bottom of the reactor, the air is supplied by the air pump and the aeration volume is controlled by a rotameter, and the aeration volume is controlled at 0.1-0.3m 3 / h. Artificially prepared simulated wastewater is loaded into the water distribution tank, sucked by a small pump, and pumped into the SBR reactor from the upper water inlet. The drain is located in the middle of the reactor, and the drain is controlled by a solenoid valve. Each operation cycle of the SBR reactor is about 4 hours. The wat...

Embodiment 2

[0062] Embodiment 2: nitrifying aerobic granular sludge to waste water (COD / NH 4 + -N / TP) processing

[0063] In the cultivation of aerobic granular sludge, the removal of pollutants during the operation of the reactor is shown in Figure 3. Since the inoculation sludge of the initial reactor is taken from the membrane bioreactor, it is the sludge domestication process in the early stage of cultivation to ensure the normal growth of the sludge. The initial influent COD concentration is 200mg / L, gradually increase the reactor influent concentration, and the influent COD concentration gradually increases from 200mg / L to 800mg / L and stabilizes there. After culturing for 35 days, the COD removal rate in the two reactors R1 and R2 was basically maintained at around 95%, which was similar to the COD removal rate of the sludge at the time of inoculation.

[0064] At the same time, it can be seen from Figure 3 that the granular sludge formed under different conditions of C / N ratio h...

Embodiment 3

[0066] Embodiment 3: nitrifying aerobic granular sludge to Pb 2+ Determination of optimal pH for adsorption

[0067] Weigh 0.1g of dry aerobic granular sludge and place it in eight 250mL stoppered Erlenmeyer flasks, add 100mL of actual wastewater, and adjust the pH values ​​to 1.25 (stock solution), 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, place the Erlenmeyer flask in a constant temperature shaking shaker, set the temperature and speed of the shaker at 25°C and 200r / min respectively, shake for 2.0h, and measure Pb after filtering with a 0.45μm filter membrane 2+ concentration value. The scanning of aerobic granular sludge before and after adsorption is shown in Fig. 4.

[0068] When the pH value is 3.5, the best adsorption effect can be achieved, and the corresponding removal rate is 97.61%, that is, the raw water quality contains Pb 2+ When the concentration is 23.8mg / L, the effluent concentration is 0.57mg / L, and the corresponding adsorption capacity is 23.23mg / g. 2+The adsor...

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Abstract

The invention discloses a nitrification aerobic granular sludge culture method and application. According to the method, an experimental device operated by a control SBR reactor is used for performing aeration, sedimentation and other biochemical culture on inoculated sludge. The experimental device operated by the control SBR reactor comprises an SBR reactor (8), a water distribution box (1), a water inlet pump (2), a flowmeter (3), a time controller (4), an air pump (5), a rotor flowmeter (7) and an electromagnetic valve (6). Nitrification aerobic granular sludge has the advantages that various oxygen concentration environments and nutritious environments can be kept at the same time inside one particle, and good growth conditions are provided by the specific oxygen concentration gradient of the particle for various microorganisms; the synchronous phosphorus and nitrogen removal capability is achieved, and degradation-resistant wastewater and high-concentration organic wastewater can be treated; the porosity is high, the specific area is large, and the sedimentation function is good. According to the method, raw materials are easy to obtain and low in price; meanwhile, adsorbed heavy metal is easy to elute, the recycling rate is high, and implementation is easy.

Description

technical field [0001] The invention relates to a cultivation method and application of nitrifying aerobic granular sludge, belonging to the technical field of aerobic environmental engineering. Background technique [0002] With the rapid development of my country's economy, environmental pollution is becoming more and more serious. Wastewater containing heavy metals and excessive nitrogen and phosphorus deeply affects our health and living environment. The "Twelfth Five-Year Plan for Comprehensive Prevention and Control of Heavy Metal Pollution" approved by the State Council clarified the following key prevention and control targets. The first category of planning targets are mainly heavy metal elements with serious pollution such as lead, chromium, mercury, cadmium and metalloid arsenic. The metal pollutants of the second category of prevention and control are copper, manganese, bismuth, thallium, nickel, zinc, tin, molybdenum, etc. The five key industries for key preve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12C02F101/20C02F101/16C02F101/30
CPCC02F3/1205C02F3/1263C02F2101/16C02F2101/20C02F2101/30Y02W10/10
Inventor 唐朝春段先月吴庆庆刘名
Owner EAST CHINA JIAOTONG UNIVERSITY
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