A kind of advanced biological treatment method of wastewater
A biological treatment, advanced technology, applied in sustainable biological treatment, aerobic process treatment and other directions, can solve the problems of running material, frequent backwashing, easy hardening of filter material, etc., to achieve high processing load, long backwashing cycle, no Easy to harden effect
Active Publication Date: 2017-12-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
BAF has the advantages of high processing load, good effluent quality, small footprint, strong impact resistance, etc., but at the same time, there are also problems such as easy hardening of the filter material, frequent backwashing and even material loss, so there are still many unsatisfactory places.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0064] A company's wastewater COD is 153mg / L, BOD 5 Dissolved oxygen is 80mg / L, and the dissolved oxygen is controlled at 6-7mg / L after mixing the waste water with the reflux water from the oxygenator. , The effluent water quality and the COD volume load of the reactor change with time as follows (time 0 is the time when the reactor backwash ends):
[0065]
[0066]
[0067] When the bed expansion ratio reached 41.2%, the reactor was started to be backwashed.
Embodiment 2
[0069] A company's wastewater COD is 96mg / L, BOD 5 Dissolved oxygen is 42mg / L. After the wastewater is mixed with the reflux water from the oxygenator, the dissolved oxygen is controlled to be 6-7mg / L. After being treated by a bioreactor filled with river sand (particle size 0.5-0.7mm), the bed expands Rate, effluent water quality and reactor COD volume load change with time as follows (time 0 is the time when the reactor backwash ends):
[0070]
[0071] When the bed expansion ratio reached 19.0%, the reactor was started to be backwashed.
[0072] In the table above:
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Abstract
The invention relates to a waste water deep biological treatment method. The method comprises the following steps: 1) mixing waste water to be processed and recirculation water from an oxygenator to form mixed waste water, and sending the mixed waste water into bottom of a bioreactor through a circulating pump; 2) after introducing the mixed waste water into the bioreactor, passing through an expanded filter filling layer from up to down, performing an aerobic biological reaction, forming overflow water at a top outlet of the bioreactor, introducing the overflow water in the oxygenator in a gravity flow mode, 3) dividing the overflow water into two strands in the oxygenator, wherein, one strand is taken as an effluent for being discharged, and the other strand is subjected to aeration oxygenation in the oxygenator and then as the recirculation water from the oxygenator in the step 1), and 4) regularly backwashing a filling material in the bioreactor. The waste water deep biological treatment method aims at disadvantage of BAF for performing technical improvement, and has the advantages of high processing loads, good water quality of the effluent, long backwashing period, little land occupation area, and strong impact resistance capability; hardening is not easily generated on the filter material, and the method is used for three-level biological processing on the waste water.
Description
technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a deep biological treatment method for waste water. Background technique [0002] Since the end of the 19th century, wastewater biological treatment technology has been applied to production. After more than one hundred years of development, biological treatment technology has become the most widely used wastewater treatment technology in the world today. With the application and continuous improvement of biological treatment technology in production practice, a variety of biological treatment technologies have emerged. [0003] According to whether the environment in which microorganisms live requires the presence of oxygen, the biological treatment of wastewater can be divided into two categories: aerobic biological treatment and anaerobic biological treatment. The premise of aerobic biological treatment is that it must be carried out in the presence of oxygen, ...
Claims
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IPC IPC(8): C02F3/02
CPCY02W10/10
Inventor 程学文莫馗李海龙侯秀华高凤霞张宾王珺
Owner CHINA PETROLEUM & CHEM CORP