High-nitrate wastewater pretreatment system and method for coal-to-ethylene glycol
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A coal-to-ethylene glycol and treatment method technology, which is applied in natural water treatment, water treatment parameter control, biological water/sewage treatment, etc., can solve the problems of high nitrate wastewater treatment difficulty and high treatment cost, and achieves the treatment cost. Low, low impact effect
Pending Publication Date: 2020-12-18
EAST CHINA ENG SCI & TECH
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[0009] The invention provides a high-nitrate wastewater pretreatment system and method for coal-to-ethyle
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Embodiment 1
[0044] See figure 1 , a high nitrate wastewater pretreatment system for coal-to-ethylene glycol,
[0045] The pretreatment system includes a regulating tank 1, an emergency tank 2, a reactor 3 and a water distribution tank group, and the reactor 3 is an expanded granular sludge bed,
[0046] The water distribution pool group includes an inlet pool 41, an outlet pool 42, and a drainage pool 43 arranged side by side in sequence, and an overflow pipe connects the outlet pool 42 and the inlet pool 41, and a weir is provided between the outlet pool 42 and the drainage pool 43 plate;
[0047] The water inlet pool 41 is connected to the flocculent sludge inlet 51 through the pipeline, the water outlet pool 42 is connected to the sulfuric acid inlet 52 and the sodium hydroxide solution inlet 53 through the pipeline, and the drainage pool 43 is connected to the water outlet 54 through the pipeline;
[0048] The high nitrate wastewater inlet 55 is connected in parallel with two branch...
Embodiment 2
[0057] The present invention also includes a treatment method for a high-nitrate wastewater pretreatment system for coal-to-ethylene glycol, comprising the following steps:
[0058] Step (1) Inoculation
[0059] The flocculent sludge is passed into the water inlet tank 41 through the flocculent sludge inlet 51, and the flocculent sludge is passed into the reactor 3 through the inflow lift pump 65, and the flocculent sludge is inoculated in the reactor 3; the selected flocculent sludge VSS / SS of sludge is 0.65~0.75, SRT>25d;
[0060] Step (2) Homogenization
[0061] The high nitrate wastewater is introduced into the regulating tank 1 through the high nitrate wastewater inlet 55, and the temperature of the high nitrate wastewater is controlled to be 15-35°C, and the homogenization time of the high nitrate wastewater in the regulating tank 1 is 48 hours. Obtain homogeneous high nitrate wastewater;
[0062] Step (3) Reaction
[0063] Normally close the cut-off valve 61, open t...
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Abstract
The invention belongs to the technical field of coal chemical industry sewage treatment, and particularly relates to a high-nitrate wastewater pretreatment system and method for coal-to-ethylene glycol. The system comprises an adjusting tank, an accident tank, a reactor and a water distribution pool group, the middle of the adjusting tank is communicated with the bottom of the accident tank through an accident lift pump pipeline, and the bottom outlet of the adjusting tank is communicated with a water inlet pool through a water outlet lift pump pipeline; the bottom outlet of the water inlet tank is communicated with a circulating water inlet at the bottom of the reactor through a water inlet lift pump and a flow regulator pipeline; a circulating water outlet at the top of the reactor is communicated with the water outlet tank through a pipeline; and a sludge outlet in the middle of the reactor is communicated with a sludge inlet in the bottom of the reactor through a reflux pump pipeline, and the outlet of the reflux pump is communicated with a sludge discharge outlet through a pipeline. The COD of the high-nitrate wastewater introduced into the pretreatment system is 12,000 mg/L,the NO3-N content is 1,000 mg/L, the COD removal rate of the treated water treated by the pretreatment system is more than or equal to 30%, the denitrification efficiency is more than or equal to 90%,and the operation cost is about 0.35 yuan/m<3> when the COD of effluent is less than or equal to 8,000 mg/L and the NO3-N content is less than or equal to 100 mg/L.
Description
technical field [0001] The invention belongs to the technical field of coal chemical wastewater treatment, and in particular relates to a high-nitrate wastewater pretreatment system and method for coal-to-ethylene glycol. Background technique [0002] Ethylene glycol is an important organic chemical raw material and strategic resource. Since the beginning of the 21st century, the consumption of ethylene glycol in my country has risen sharply. Coal-to-ethylene glycol uses coal as the raw material, and the technical route is in line with my country's resource characteristics of lack of oil, less gas, and relatively rich coal materials. [0003] During the industrial production process of coal-to-ethylene glycol, the wastewater produced contains high concentration of nitrate nitrogen, and the wastewater with high nitrate nitrogen flows directly into rivers and lakes, which will pollute surface water and groundwater, leading to the death or even extinction of aquatic animals and...
Claims
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