CN105366749A - Treatment method of high-salinity organic volatile waste water - Google Patents

Abstract

The invention discloses a treatment method of high-salinity organic volatile waste water. The treatment method comprises the following specific steps: 1, picking and adding the high-salinity organic volatile waste water into an evaporation device, then adding a persulfate solution, and conducting stirring and uniform mixing; 2, adjusting the pH value of a mixed solution in the evaporation device to be 6-9, heating and evaporating the waste water in the evaporation device at the temperature-rise rate of 3.5 DEG C/min, and guiding steam generated in the evaporation process to enter a next condensation device; 3, guiding condensed water generated through condensation in the condensation device to enter a drainage system along a drainpipe, wherein the concentration of organic compounds in the condensed water meets the emission standards; 4, after the waste water in the evaporation device is completely evaporated, taking out residual salt in the evaporation device for recycling, wherein the recycled salt approaches the anhydrous state. By means of the treatment method of the high-salinity organic volatile waste water, recycling of the salt in the high-salinity organic volatile waste water and degradation of organic pollutants are achieved simultaneously through the simple and effective mode.

Description

A kind for the treatment of process of high salt volatile organic waste water

Technical field

The invention belongs to industrial waste water treatment, be specifically related to a kind for the treatment of process of high salt volatile organic waste water.

Background technology

In the intermediate building-up process of the industries such as food-processing and fine chemistry industry, medicine, agricultural chemicals, dyestuff, high salt organic waste water can be produced.Because in these high salt organic waste waters, salts contg is very high, to microorganism, there is extremely strong killing and restraining effect, can not process with traditional biochemical process, usually evaporative crystallization technique first to be adopted to carry out desalination, and then by biochemical or other method, condensation sewage is further processed, complex process, operational management difficulty is high.Therefore, develop new high-salt wastewater treatment process, realize salt at a processing unit simultaneously and to reclaim and organic pollutant degradation two objects are breakthroughs of high salt organic waste water process field, have broad application prospects.

Summary of the invention

The technical problem that the present invention solves there is provided a kind for the treatment of process being realized the high salt volatile organic waste water of salt recovery and organic pollutant degradation in high salt organic waste water by simple and effective way, this treatment process less investment, processing efficiency is high, treatment scheme is short and operation easier is little, the fast degradation to volatile organic contaminant in waste water can be realized by control temperature rise rate, organism in waste water can not be volatilized with steam, guarantee that in water of condensation, organic concentration meets emission standard, substantially not residual organic contaminants in evaporation unit after evaporation completely, in the salt reclaimed, organic content is lower, use value is high, need not carry out large-scale redevelopment to the existing evaporation unit of enterprise just can adopt this technique effectively to process high salt organic waste water.

The present invention adopts following technical scheme for solving the problems of the technologies described above, and a kind for the treatment of process of high salt volatile organic waste water, is characterized in that concrete steps are:

(1) get high salt volatile organic waste water to join in evaporation unit, then add persulfate solution and be uniformly mixed;

(2) regulate the pH=6-9 of mixing solutions in evaporation unit, to the waste water in evaporation unit with the temperature rise rate heating evaporation of 3.5 DEG C/min, the steam that evaporative process produces enters next condensing works;

(3) water of condensation produced after condensation in condensing works enters in water exhaust system with water shoot, and in this water of condensation, organic concentration meets emission standard;

(4), after the complete evaporate to dryness of waste water in device to be evaporated, take out salinity residual in evaporation unit and reclaim, the salinity of recovery is close to anhydrous state.

The treatment process of methyl alcohol height salt organic waste water of the present invention, is characterized in that concrete steps are:

(1) to get 50mL methanol quality concentration be 500mg/L, NaCl massfraction be 5% methyl alcohol height salt organic waste water join in evaporation unit, then the potassium persulfate solution added containing 5.4064g Potassium Persulphate being uniformly mixed;

(2) regulate the pH=7 of mixing solutions in evaporation unit, to the waste water in evaporation unit with the temperature rise rate heating evaporation of 3.5 DEG C/min, the steam that evaporative process produces enters next condensing works;

(3) water of condensation produced after condensation in condensing works enters in water exhaust system with water shoot, and in this water of condensation, the concentration of methyl alcohol meets emission standard;

(4), after the complete evaporate to dryness of waste water in device to be evaporated, take out salinity residual in evaporation unit and reclaim, the salinity of recovery is close to anhydrous state.

The present invention compared with prior art has following beneficial effect:

1, effective degraded of organic pollutant in high salt organic waste water can be realized, secondary treatment need not be carried out to water of condensation;

2, the salts substances in high salt organic waste water can be reclaimed;

3, evaporation unit can be utilized to realize the recovery of organic degraded and salts substances, whole sewage treatment process a step can complete in an evaporation unit, and treatment scheme is short simultaneously, and treatment unit is simple, and processing efficiency is high.

Accompanying drawing explanation

Fig. 1 is process flow sheet of the present invention.

Fig. 2 is that the embodiment of the present invention 2 different concns potassium persulfate solution is to the degradation curve of methyl alcohol high-salt wastewater;

Fig. 3 is that the mixing solutions of the different pH of the embodiment of the present invention 3 is to the degradation curve of methyl alcohol high-salt wastewater;

Fig. 4 is that the NaCl of the embodiment of the present invention 4 different mass mark is to the degradation curve of methyl alcohol high-salt wastewater;

Fig. 5 is that the different dosing method of the embodiment of the present invention 5 persulphate is to the degradation curve of methyl alcohol high-salt wastewater.

Embodiment

Be described in further details foregoing of the present invention by the following examples, but this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following embodiment, all technology realized based on foregoing of the present invention all belong to scope of the present invention.

Embodiment 1

In waste water, the massfraction of NaCl is 5%, and system pH is adjusted to 7 in advance.Table 1 is the degradable situation of different concns methyl alcohol high-salt wastewater, can find out that the COD containing the high salt organic waste water of different concns methyl alcohol is certain linear ratio relation close to the amount of degradable required persulphate.

The degradable situation of table 1 different concns methyl alcohol high-salt wastewater

Methanol concentration (mg/L)	Potassium Persulphate concentration (moL/L)	COD degradation rate (%)
			1000	0.1	98.3
900	0.09	98.2
			800	0.08	98.7
700	0.07	98.4
			600	0.06	98
500	0.05	96.9

Embodiment 2

In waste water, methanol concentration is the massfraction of 500mg/L, NaCl is 5%, and system pH is adjusted to 7, and the temperature rise rate controlling evaporation unit is 3.5 DEG C/min.Fig. 2 is the impact that Potassium Persulphate concentration is degraded on methyl alcohol high-salt wastewater, as can be seen from Figure 2, along with Potassium Persulphate concentration constantly increases, the COD of distillate is in continuous reduction, when Potassium Persulphate concentration is 0.05moL/L, the COD of distillate, almost close to degradable, namely illustrates organism in waste water solution in heating evaporation process close to degradable.

Embodiment 3

In waste water, methanol concentration is the massfraction of 500mg/L, NaCl is 5%, and Potassium Persulphate concentration is 0.04mol/L, and the temperature rise rate controlling evaporation unit is 3.5 DEG C/min.Fig. 3 is the impact that pH degrades on methyl alcohol high-salt wastewater, and as can be seen from Figure 3, pH is little on its impact, when pH is 7 in reaction system, is comparatively conducive to reaction relative to acid alkaline environment.

Embodiment 4

In waste water, methanol concentration is 500mg/L, Potassium Persulphate concentration is 0.04moL/L, and system pH is adjusted to 7, and the temperature rise rate controlling evaporation unit is 3.5 DEG C/min.Fig. 4 is the impact that NaCl degrades on methyl alcohol high-salt wastewater, as can be seen from Figure 4, NaCl massfraction is increased to 3% from 1%, slight suppression trend is had to the degraded of methyl alcohol high-salt wastewater, afterwards along with the increase of NaCl concentration, degradation rate has increased slightly, and generally speaking, the impact that NaCl degrades on methyl alcohol high-salt wastewater is little.

Embodiment 5

In waste water, methanol concentration is 500mg/L, Potassium Persulphate concentration be the massfraction of 0.04moL/L, NaCl is 5%, and system pH is adjusted to 7, and the temperature rise rate controlling evaporation unit is 3.5 DEG C/min.Fig. 5 is the impact that Potassium Persulphate dosing method is degraded on methyl alcohol high-salt wastewater, dosing method 1: Potassium Persulphate dosage is 5.4064g, and is dissolved; Dosing method 2: add Potassium Persulphate particle 5.4064g; Dosing method 3:3.379g+0.6758g+0.6758g+0.6758g; Dosing method 4:2.7032g+1.3516g+0.6758g+0.6758g; Dosing method 5:1.3516g+1.3516g+1.3516g+1.3516g, interval of adding is 30min, and as can be seen from Figure 5, dosing method 1 is best.

Embodiment above describes ultimate principle of the present invention, principal character and advantage; the technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present invention; under the scope not departing from the principle of the invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the scope of protection of the invention.

Claims (2)

1. a treatment process for high salt volatile organic waste water, is characterized in that concrete steps are:

(1) get high salt volatile organic waste water to join in evaporation unit, then add persulfate solution and be uniformly mixed;

(2) regulate the pH=6-9 of mixing solutions in evaporation unit, to the waste water in evaporation unit with the temperature rise rate heating evaporation of 3.5 DEG C/min, the steam that evaporative process produces enters next condensing works;

(3) water of condensation produced after condensation in condensing works enters in water exhaust system with water shoot, and in this water of condensation, organic concentration meets emission standard;

(4), after the complete evaporate to dryness of waste water in device to be evaporated, take out salinity residual in evaporation unit and reclaim, the salinity of recovery is close to anhydrous state.

2. a treatment process for methyl alcohol height salt organic waste water, is characterized in that concrete steps are:

(1) to get 50mL methanol quality concentration be 500mg/L, NaCl massfraction be 5% methyl alcohol height salt organic waste water join in evaporation unit, then the potassium persulfate solution added containing 5.4064g Potassium Persulphate being uniformly mixed;

(2) regulate the pH=7 of mixing solutions in evaporation unit, to the waste water in evaporation unit with the temperature rise rate heating evaporation of 3.5 DEG C/min, the steam that evaporative process produces enters next condensing works;

(3) water of condensation produced after condensation in condensing works enters in water exhaust system with water shoot, and in this water of condensation, the concentration of methyl alcohol meets emission standard;

(4), after the complete evaporate to dryness of waste water in device to be evaporated, take out salinity residual in evaporation unit and reclaim, the salinity of recovery is close to anhydrous state.