Organic waste water anaerobic treatment method

Abstract

The invention relates to an organic waste water anaerobic treatment method, which belongs to the waste water treatment technology field. The invention adopts a processing apparatus composed by a tower type container with and a water distribution device, a three phase separator and a matched gas-liquid pressure balancer doubled as a water power flame arrester disposed therein; an acid-producing bacteria gathering area and a methane-producing bacteria gathering area are disposed above the water distribution device. the processed water is formed into homogeneously distributed rising water flow on the cross section of the apparatus by passing through the water distribution device; the organic compounds in the water is decomposed into methane and carbon dioxide gas in the acid-producing bacteria gathering area and the methane-producing bacteria gathering area; all the gases and liquid are passed through the three phase separator to be separated and the gas-liquid pressure balancer doubled as a water power flame arrester to be discharged; and the anaerobic bacteria sludge is entrapped in the apparatus effectively without loss. The invention needs not to dispose hydrolysis-acidification pool or water outlet backflow, has a simple process, can operate stably under the volume load of 1-30kgCOD / M.d, and can reach the organic compounds removal rate of waste water to about 90%.

Description

technical field [0001] The invention relates to an anaerobic treatment method for organic wastewater, in particular to an organic wastewater treatment method which does not require a hydrolysis acidification tank and does not use reflux of treated water, and belongs to the field of wastewater treatment. Background technique [0002] In recent years, anaerobic treatment, as an energy-saving and biogas-generating organic wastewater treatment technology, has become one of the most eye-catching technologies in the field of organic wastewater treatment. The core of anaerobic treatment technology is not only to promote the optimized high-density reproduction of anaerobic bacteria and form a stable anaerobic metabolic ecosystem, but also to make the process simple and easy to implement, and the treatment device used has a simple structure. [0003] Under the guidance of the above goals, the current anaerobic treatment methods include complete mixed anaerobic treatment, anaerobic fi...

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Problems solved by technology

Since this kind of bacteria is more sensitive to the change of pH value and temperature, and when the substrate concentration exceeds 5000mg / LCOD, it will also cause substrate inhibition problem, so it is necessary to adopt more complex and strict control measures to control the water quality of the device, to give processing costs increase

At the same time, since the waste water reacts in the hydrolytic acidification tank, it will produce malodorous gas to pollute the environment, so it is necessary to increase the complex odor treatment facilities and operating costs

[0006] 2. The structure of the processing device itself is complex

The backflow of treated water not only complicates the ancillary equipment of the device, but also reduces the matrix concentration in the influent

Therefore, it not only increases the cost and operating cost of the treatment system, but also is not conducive to improving the rate of biological reactions.

Since the baffle three-phase separator with a triangular section is arranged and installed inside the device according to strict geometric requirements, its volume occupies about 1 / 3 of the space of the device, so the mechanical structure of the device is complicated and the cost is high. increase

[0007] 3. Granular sludge must be used as inoculation to start

In most cases, it is difficult and expensive to find a suitable granular sludge to be used as the inoculum sludge of the anaerobic treatment plant.

The current design of UASB and EGSB requires the use of granular sludge to start, which limits its application to a large extent and is not conducive to its expansion of the market

[0008] 4. Only suitable for high volume loads

When the current UASB and EGSB operate under low volume load, the granular sludge will disintegrate and flow out with the effluent, so they are only suitable for operation under higher volume load

However, when treating higher concentration organic wastewater, the high volume load will result in a high concentration of residual organic matter in the effluent, which will increase the difficulty and cost of subsequent aerobic treatment to meet the standard

At the same time, in most cases, due to the limitation of the characteristics of the wastewater, the anaerobic treatment device cannot operate under high load. At this time, the current anaerobic treatment device is difficult to be applied, which also limits its application range.

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