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A biochemical treatment method for oil refinery wastewater
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A technology for oil refining wastewater and biochemical treatment, applied in natural water treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of harsh start-up conditions and poor universality of granular sludge. Sludge bulking, avoiding sludge loss, high biomass effect
Active Publication Date: 2021-05-04
CHINA UNIV OF PETROLEUM (BEIJING)
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However, the universality of granular sludge is poor and the conditions for starting work are relatively harsh. Only when granular sludge can grow in the wastewater to be treated, exist stably, and cultivate targeted degrading bacteria in the wastewater to be treated, can the granular sludge be used play to its advantage
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Embodiment 1
[0111] The treatment object of this embodiment is the oily waste water of a certain refinery. After the oily waste water is diluted and deoiled pre-treated, the oil content is 150-170 mg / L, the COD is 800-1000 mg / L, and the ammonia nitrogen is 8-25 mg / L. L of refinery wastewater to be treated. According to the volume of UASB and SBR, the amount of treated water in this implementation is 0.2m 3 / d.
[0112] The first influent is the diluted product of refinery wastewater to be treated, which is used for the cultivation and domestication of anaerobic granular sludge. The oil content of the first influent is 120mg / L, and the COD is 500-600mg / L;
[0113] The second influent is the diluted product of refinery wastewater to be treated, which is used for the cultivation and domestication of aerobic granular sludge. The oil content of the second influent is 70mg / L, and the COD is 200-300mg / L;
[0114] The present embodiment comprises the following steps to the biochemical treatment ...
Embodiment 2
[0148] The treatment object of this embodiment is oily wastewater from heavy oil refineries. After dilution treatment and deoiling pretreatment, the oily wastewater will have an oil content of 250-280 mg / L, COD of 1500-2500 mg / L, and ammonia nitrogen of 8- 25mg / L of refinery wastewater to be treated. According to the volume of UASB and SBR, the amount of treated water in this implementation is 1.8m 3 / d.
[0149] The first influent is the diluted product of refinery wastewater to be treated, which is used for the cultivation and domestication of anaerobic granular sludge. The oil content of the first refinery wastewater is 120mg / L, and the COD is 500-600mg / L;
[0150] The second influent is the diluted product of refinery wastewater to be treated, which is used for the cultivation and domestication of aerobic granular sludge. The oil content of the second influent is 70mg / L, and the COD is 200-300mg / L;
[0151] The present embodiment comprises the following steps to the bioc...
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Abstract
The invention provides a biochemical treatment method of oil refinery wastewater, which utilizes UASB anaerobic reactors and SBR aerobic reactors arranged in series, and wherein cultivated and domesticated anaerobic granular sludge and aerobic granular sludge are respectively arranged, The treatment method includes the following processes: operating UASB and SBR, introducing the untreated oil refining wastewater into the UASB for anaerobic treatment, and introducing the anaerobically treated wastewater into the SBR for aerobic treatment after being discharged, wherein the untreated oil refining wastewater The oil content is not higher than 300mg / L, the COD of the wastewater entering the SBR is 200-600mg / L, and the pH is 6.5-7.5. This treatment method can not only avoid the loss of sludge, save the area occupied by the reactor, and reduce the cost of infrastructure investment, but also the indicators of the treated wastewater can meet the relevant industry standards.
Description
technical field [0001] The invention relates to a wastewater treatment method, in particular to a biochemical treatment method for oil refinery wastewater. Background technique [0002] Due to the complex refining process, long process and different material components, the water quality of oil refining wastewater fluctuates greatly, and the pollutants are numerous and complex in composition. It not only contains petroleum, ammonia nitrogen, sulfide and other substances, but also contains a large amount of dissolved organic matter, including Phenols, organic acids, aldehydes and ketones, esters, alkanes, polycyclics, organic amines, alcohols, nitriles, heterocyclic compounds, etc. In recent years, as the proportion of heavy crude oil processed in the petroleum refining process continues to increase, the biological toxicity, treatment load and biodegradation difficulty of refinery wastewater continue to increase, the quality of wastewater continues to deteriorate, and the loa...
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