CN203845908U

CN203845908U - Device for treating wastewater generated in production of N-methylpyrrolidone

Info

Publication number: CN203845908U
Application number: CN201420129937.4U
Authority: CN
Inventors: 宋国全; 杨理; 徐富
Original assignee: MAIQI CHEMICAL Co Ltd
Current assignee: MAIQI CHEMICAL Co Ltd
Priority date: 2014-03-21
Filing date: 2014-03-21
Publication date: 2014-09-24
Anticipated expiration: 2024-03-21

Abstract

The utility model relates to a device for treating wastewater generated in production of N-methylpyrrolidone. The device for treating the wastewater generated in the production of the N-methylpyrrolidone comprises a water collecting well and is characterized in that the water collecting well is communicated with a regulating tank by virtue of a pump; the regulating tank is communicated with a UASB (Upflow Anaerobic Sludge Blanket) anaerobic reactor by virtue of a pump; the UASA anaerobic reactor is communicated with a first-grade A/O biochemical pool; the first-grade A/O biochemical pool is communicated with a second-grade A/O biochemical pool; the second-grade A/O biochemical pool is communicated with a secondary sedimentation tank; the secondary sedimentation tank is communicated with a carbon filter tank. The wastewater treatment device has the advantages that the discharged water is excellent in quality, the operation is stable, the process is simple, the floor space is small and the maintenance frequency is low. The overall wastewater treatment device has a test run and the UASA anaerobic reactor suffers impacts of high pH value, organic load, parking, driving and the like and passes the test on buffering capability of high-pH value wastewater, load bearing capability and restart effect recovery condition of the reactor, therefore the wastewater treatment device is proven to have relatively high impact resistance.

Description

A kind of device of processing N-Methyl pyrrolidone factory effluent

technical field:

The utility model relates to a kind of device of processing N-Methyl pyrrolidone factory effluent.

background technology:

Existing N-Methyl pyrrolidone (being called for short NMP) production equipment adopts 1,4-butanediol gas phase dehydrogenation technique is prepared gamma-butyrolactone, gamma-butyrolactone makes N-Methyl pyrrolidone with methylamine is synthetic again, and NMP is wide as the market outlook of lithium ion battery solvent, medicine, dyestuff and insulating material.The process section that NMP production equipment produces waste water is mainly methylamine process section, reclaims thick NMP process section and tetrahydrofuran (THF) process section, and the Pollutants in Wastewater that this production equipment is discharged is mainly COD and ammonia nitrogen.Remove the method for ammonia nitrogen and generally have struvite crystallization process, chemical precipitation method, air stripping method, By Electrocatalytic Oxidation, supersonic method], Anammox method etc., but aforesaid method exists and adds medicament, secondary pollution, operational administrative complexity, the application of difficult engineering, equipment cost and drop into the problems such as high.

Summary of the invention

The utility model is exactly for the deficiencies in the prior art, and a kind of device of processing N-Methyl pyrrolidone factory effluent is provided.The utility model is for processing for the waste water that raw material production N-Methyl pyrrolidone is produced with Isosorbide-5-Nitrae butyleneglycol and methylamine, and simple in structure, design science is reasonable, practical.

The technical scheme that the utility model provides is:

A kind of device of processing N-Methyl pyrrolidone factory effluent, comprise pump well, pump well is communicated with equalizing tank by pump, equalizing tank is communicated with UASB anaerobic reactor by pump, UASB anaerobic reactor is communicated with one-level A/O biochemistry pool, one-level A/O biochemistry pool is communicated with secondary A/O biochemistry pool, and secondary A/O biochemistry pool is communicated with second pond, and second pond is communicated with carbon filtering pool.

Concrete, described pump well is also communicated with accident pool, and accident pool is communicated with equalizing tank by pump.

Concrete, described UASB anaerobic reactor is also connected with Marsh gas collector.

Concrete, second pond bottom is also connected with one-level A/O biochemistry pool and secondary A/O biochemistry pool by pump.

This wastewater treatment equipment effluent quality is good, stable, technique is simple, floor space is few, maintenance is few.Whole wastewater treatment equipment is through test run, UASB anaerobic reactor has experienced high pH value, organic loading, has stopped the impacts such as car, pass through the test that the surge capability to high pH value waste water, the ability of bearing load and reactor restart effect recovery situation, verified that this wastewater treatment equipment has stronger shock-resistant ability.

Brief description of the drawings

Fig. 1 is structural representation of the present utility model.

Embodiment

As shown in Figure 1, a kind of device of processing N-Methyl pyrrolidone factory effluent, comprises pump well, and pump well is collected N-Methyl pyrrolidone factory effluent.Pump well is communicated with equalizing tank by pump, and described pump well is also communicated with accident pool, and accident pool is communicated with equalizing tank by pump.Equalizing tank is communicated with UASB anaerobic reactor by pump, and UASB anaerobic reactor is communicated with described UASB anaerobic reactor with one-level A/O biochemistry pool and is also connected with Marsh gas collector.One-level A/O biochemistry pool is communicated with secondary A/O biochemistry pool, and secondary A/O biochemistry pool is communicated with second pond, and second pond is communicated with carbon filtering pool.Second pond bottom is also connected with one-level A/O biochemistry pool and secondary A/O biochemistry pool by pump.

Each strand of waste water is collected at pump well, and then pumps into equalizing tank, regulates water quality, the water yield of waste water, simultaneously temperature control and extra-nutrition salt.Waste water after overregulating pumps into UASB anaerobic reactor, and operating temperature is 35-38 DEG C, and the organism in waste water is converted into biogas, reduces the COD of anaerobic effluent.The water outlet of UASB anaerobic reactor is from flowing into one-level A/O biochemistry pool.In one-level A/O biochemistry pool, under good oxygen condition, ammonia nitrogen is oxidized to nitric nitrogen by nitrobacteria, and the mixed solution after nitrated is pumped in one-level A/O biochemistry pool, and under anoxic condition, nitrate-nitrogen reduction is become nitrogen by denitrifying bacteria.Secondary A/O biochemistry pool occurs and nitrification and denitrification identical in one-level A/O biochemistry pool reaction too, and water outlet ammonia nitrogen is reduced to requirement up to standard.Second pond carries out mud-water separation, clarification and effluent, the sludge part of precipitation is back to one-level A/O biochemistry pool and secondary A/O biochemistry pool, improve the sludge concentration of two-stage A/O biochemistry pool, precipitation water outlet adds gac, filter the SS of water outlet and the pollutent of absorption difficult for biological degradation, ensure water outlet qualified discharge.

The present embodiment is for processing for the waste water that raw material production N-Methyl pyrrolidone is produced with Isosorbide-5-Nitrae butyleneglycol and methylamine.Adopting UASB anaerobic reactor and two-stage A/O biochemistry pool is main art breading NMP waste water, and UASB anaerobic reactor influent COD is in 2950 mg/L left and right, and water outlet COD is in 600 mg/L left and right, and COD clearance is in 80% left and right, and OLR is 2.4 kgCOD/ (m ³d).Control one-level A/O biochemistry pool A section DO<0.1 mg/L, O section 1.5-2.5 mg/L, secondary A/O biochemistry pool A section DO<0.5 mg/L, O section 2-3 mg/L.One-level A/O biochemistry pool water outlet COD average out to 59.0 mg/L, ammonia nitrogen is 10.7 mg/L, reach " urban wastewater treatment firm wastewater pollutants emission standard " (GB18918-2002) one-level B standard, secondary A/O biochemistry pool water outlet COD average out to 45.8 mg/L, ammonia nitrogen is 4.7 mg/L, has reached one-level A standard.

UASB anaerobic reactor seed sludge water ratio 81.8%, ash content 57.9%, seed sludge amount is 60 t, UASB anaerobic reactor inoculation artifact amount concentration MLSS is 6800 mg/L.UASB anaerobic reactor influent COD is in 2950 mg/L left and right, and water outlet COD is in 600 mg/L left and right, and COD clearance is in 80% left and right.UASB anaerobic reactor influent ammonium concentration is in 300-350 mg/L left and right, and UASB anaerobic reactor does not have removal effect to ammonia nitrogen.

The domestication of two-stage A/O biochemistry pool mud adopts the vexed mode of exposing to the sun of intermittent type, synchronizes and carries out with anaerobism.While starting to debug, surfactant foam is a lot, and sludge settling is slow, and along with the prolongation of working time, surfactant foam tails off, and mud is grown up good.One-level A/O biochemistry pool O section DO exceedes 3.0 mg/L, the A section that can make DO enter secondary biochemical pond with the water outlet of one-level A/O biochemistry pool, causes secondary A/O biochemistry pool A section DO to exceed 1.0 mg/L, destroys the environment of anoxic section, reduced denitrification effect, thereby system water outlet ammonia nitrogen is greater than 5 mg/L.One-level A/O biochemistry pool O section DO is less than 1.5 mg/L, and DO can suppress one-level A/O biochemistry pool O section nitrification, by reducing one-level A/O biochemistry pool O section aeration rate, reduces secondary A/O biochemistry pool A section, and system ammonia nitrogen could be up to standard.Control one-level A/O biochemistry pool A section DO<0.1 mg/L, O section 1.5-2.5 mg/L, secondary A/O biochemistry pool A section DO<0.5 mg/L, O section 2-3 mg/L.

One-level A/O biochemistry pool water outlet COD average out to 59.0 mg/L, ammonia nitrogen is 10.7 mg/L, reach " urban wastewater treatment firm wastewater pollutants emission standard " (GB18918-2002) one-level B standard, secondary A/O biochemistry pool water outlet COD average out to 45.8 mg/L, ammonia nitrogen is 4.7 mg/L, has reached one-level A standard.

Claims

1. process the device of N-Methyl pyrrolidone factory effluent for one kind, comprise pump well, it is characterized in that, pump well is communicated with equalizing tank by pump, equalizing tank is communicated with UASB anaerobic reactor by pump, and UASB anaerobic reactor is communicated with one-level A/O biochemistry pool, and one-level A/O biochemistry pool is communicated with secondary A/O biochemistry pool, secondary A/O biochemistry pool is communicated with second pond, and second pond is communicated with carbon filtering pool.

2. a kind of device of processing N-Methyl pyrrolidone factory effluent according to claim 1, is characterized in that, described pump well is also communicated with accident pool, and accident pool is communicated with equalizing tank by pump.

3. a kind of device of processing N-Methyl pyrrolidone factory effluent according to claim 1, is characterized in that, described UASB anaerobic reactor is also connected with Marsh gas collector.

4. a kind of device of processing N-Methyl pyrrolidone factory effluent according to claim 1, is characterized in that, second pond bottom is also connected with one-level A/O biochemistry pool and secondary A/O biochemistry pool by pump.