Method for processing high-concentration wastewater containing alkaline mud

A technology of alkali residue wastewater and treatment method, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of large system impact load, poor biodegradability, and high power consumption , to reduce organic matter load, improve biodegradability, and reduce COD

Active Publication Date: 2010-04-14
TONGJI UNIV +1
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Problems solved by technology

[0009] The following problems exist in the mixed treatment of alkali slag and other wastewater in refineries: (1) The alkali slag has an impact load on the large system, which destroys the stable operation of the large system and leads to deterioration of the effluent water quality; (2) The high chroma of the alkali slag causes the effluent to have an impact (3) The long-term accumulation of persistent organic pollutants in the alkali slag will affect the performance of the biochemical system after a certain period of time;
It needs to dilute the COD of alkali slag wastewater to below 1100mg / L (the dilution factor reaches about 80 times), and it needs to consume a lot of dilution water
[0013] Chinese patent CN 98121082.1 adopts SBR (sequenced batch activated sludge method) to treat alkali residue wastewater. After pretreatment, alkali residue wastewater is diluted with condensed water and enters the SBR system, and the COD load of sludge is controlled through sludge domestication and cultivation. Basically, to realize the COD reduction process, it is also difficult to treat high-concentration alkali slag wastewater. The SBR reactor needs to be set with a high reflux ratio, high power consumption, and the problem of alkali slag toxicity and poor biodegradability is not solved.
Existing technologies are difficult to combat the toxicity and organic matter load of alkali slag wastewater, and the existence of persistent pollutants in the system will affect the long-term and stable operation of the system
[0015] In order to improve the treatment effect of alkali slag wastewater, provide a new sewage solution for oil refineries, especially for the problems of poor biodegradability and poor treatment process feasibility of alkali slag wastewater, and propose feasible, economical and efficient solutions

Method used

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  • Method for processing high-concentration wastewater containing alkaline mud
  • Method for processing high-concentration wastewater containing alkaline mud
  • Method for processing high-concentration wastewater containing alkaline mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 1 As shown, the alkali slag wastewater enters the regulating tank 1 to adjust the water volume and water quality, and enters the micro-electrolysis pretreatment system 3 through the lift pump 2 (corrosion-resistant treatment), and enters the water from the bottom. The bottom of the micro-electrolysis pretreatment system is equipped with an aeration tube, which has the dual functions of sufficient mass transfer and preventing packing structure. The micro-electrolytic filler is constructed into a rod shape and filled according to a volume ratio of 30%-80%. The stable operation of the micro-electrolysis pretreatment system is ensured by the double structure of water distribution and aeration. The residence time of the whole micro-electrolysis pretreatment process is 2-8h, and it is recommended to be 4-6h, so as to ensure the effect of pretreatment. The pretreatment system enters the coagulation sedimentation system through the valve C2. The coagulation mixi...

Embodiment 2

[0041] Take the comprehensive alkali slag effluent from a petrochemical refinery through mild wet oxidation technology. The characteristics of the wastewater are high organic matter, high toxicity, high phenolic substances, and poor biodegradability. The COD concentration is 81000mg / L, the volatile phenol content is 910mg / L, and the BOD / COD is less than 0.05, and the chromaticity is 12500 times.

[0042] The micro-electrolysis pretreatment reactor uses iron-carbon mixture as the filler layer, and the filling rate is 20%. The temperature of the reactor is controlled at room temperature. When the residence time of alkali slag wastewater is 8-12h, the COD concentration of the effluent is 6000mg / L, BOD / COD =0.34, the volatile phenol concentration is 76mg / L, the whole effluent has the taste of yogurt, the pungent taste basically disappears, and the chroma is reduced to about 800 times. The effluent of the micro-electrolysis system is treated by the coagulation system, and the COD ...

Embodiment 3

[0046] After mild wet oxidation treatment in a petrochemical refinery, the alkali slag wastewater stored in the storage tank is mixed with the upper concentrated liquid and the small layer clear liquid at a ratio of 1:3. The mixed COD concentration is 300,000 mg / L and the chromaticity is 50,000 times . The iron-carbon and iron-copper systems are used for treatment respectively. When the hydraulic retention time is 6h, the COD concentration after treatment by the iron-carbon system is 16984mg / L, the chromaticity of the effluent is 1200 times, and the COD concentration after treatment by the iron-copper system is 19864mg / L, the chromaticity of the effluent is 900 times, the biodegradability BOD / COD of the wastewater after iron-carbon and iron-copper treatment are 0.43 and 0.52 respectively, and the biodegradability of the wastewater is greatly improved. The effluent of iron-copper micro-electrolysis is coagulated and precipitated, and a polymer flocculant with a molecular weigh...

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Abstract

The invention discloses a method for processing wastewater containing alkaline mud with high COD concentration, high toxicity, low biodegradability and high chroma. In the invention, a micro-electrolysis pretreatment, and flocculating and decoloring process are adopted to reduce the COD concentration and chroma and improve the biodegradability, thus providing precondition for the subsequent acidified hydrolysis and aerobic treatment system to further eliminate alkaline mud contamination load; and the yielding water is deposited by a deposition pool and discharged after disinfection. In the invention, the COD concentration (80,000-300,000mg / L) and the chroma (12,500-50,000 times) of inflowing water are improved to maximum degree, stability for the running of system is considered sufficiently, a large amount of diluted water required in the running process is saved, the yielding water can be directly exhausted to urban sewage pipelines, received by waterbody or combined in other treatment systems for treatment, and can comply with the recycling standard. In the whole treatment process, the secondary pollution is not generated, the total emission amount of COD is reduced, the whole system runs conveniently and quickly, and the investment and running expense is far lower than that of the traditional film treatment system.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to an efficient treatment method for alkali washing waste water (commonly known as oil refinery alkali slag), especially suitable for effluent of alkali slag pretreated by a moderate wet oxidation system. Background technique [0002] The petroleum refining industry takes petroleum as the main raw material and converts it into petroleum products through atmospheric and vacuum distillation, catalytic cracking, hydrocracking, delayed coking and other production processes. Its main products are gasoline, diesel, kerosene, liquid hydrocarbons, Lubricating oil, asphalt, etc. The products of secondary processing of high-sulfur crude oil often contain impurities such as non-hydrocarbon compounds and diolefins with relatively high concentrations, resulting in unstable oil properties and poor quality, which need to be refined. At present, my country's oil refineries generall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/461C02F1/52C02F3/30
Inventor 张亚雷王海峰庞维海章明
Owner TONGJI UNIV
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