CN1807467A - Water-saving method when processing Gracilaria to produce agar - Google Patents

Abstract

Water-saving method which produces agar by processing jiangli, contraposing process flow and all procedure's water use characteristic of jiangli, reclaiming discharged water which contains litter acid, alkali or impurity, reclaiming the reclaimed water in corresponding recovery pond according to contained acid, alkali or impurity, applying in production again after deposition, improving the availability ratio of water, reducing the use of tap-water or underground water. The invention's effect is evidence; the water-saving rate is as high as 52. 4% when producing strip product, the water-saving rate is as high as 31. 3% when producing powdery product, having biggish significance to save producing cost and spread using aptly.

Description

Water-saving method when fragrant plant mentioned in ancient texts is carried out processing agar

Technical field

The invention belongs to the wastewater treatment in the chemical treatment, the water-saving method when particularly fragrant plant mentioned in ancient texts being carried out processing agar.

Background technology

At present, each operation had all been used a large amount of water when fragrant plant mentioned in ancient texts was carried out processing agar, we can say, water plays crucial effect in fragrant plant mentioned in ancient texts processing, though the production technique and the method for each manufacturer are had nothing in common with each other, but no matter adopt which kind of technology and method, basically discharge water is not all reclaimed usefulness again, water consumption is very considerable.In China's water resources critical shortage and environment serious day by day today, exploitation difficulty is increasing, does not add aborning to make water temperately in a large number, will cause great negative impact to environment and continuous development of society economy.

Summary of the invention

The purpose of this invention is to provide a kind of water-saving method when fragrant plant mentioned in ancient texts is carried out processing agar, the technological process of production of processing at fragrant plant mentioned in ancient texts and the water characteristics of each operation, to contain acid, alkali is less or impure less discharge water reclaims, the water that reclaims is recovered in the corresponding pond for recovering according to the difference that contains acid, alkali and impurity, after filtration, post precipitation is used once more and is produced, improve the utilization ratio of water, reduce tap water or phreatic use.

The present invention includes following steps:

(1) reclaims lixiviating and clean the alkalescent water that produces

Fragrant plant mentioned in ancient texts after the alkaline purification is added water clean 1-7 time, clean the 1-5 time, pH and be discharged in the treatment tank, emit after treatment greater than 7.5 water; Clean the 6th, 7 time the water and the water of immersion and be recovered to the weakly alkaline pond, pH is stabilized in 6.5-7.5, the cleaning the 1st, 2 times of lixiviating matting when being used for after filtering producing next time;

(2) weakly acidic water behind the recovery cleaning bleaching fragrant plant mentioned in ancient texts

Fragrant plant mentioned in ancient texts after the bleaching is added water clean the 1-2 time, sodium hypochlorite solution, cleaning the 1st, 2, pH are discharged in the treatment tank less than 5.5 water, emit after treatment; Soak 1-3 time then, the timed interval is to change water one time in 1-2 hour, and pH is stabilized in 6.0-6.5, and the water that soaks the 1st, 2,3 time is recovered in the slightly acidic pond, after filtration, post precipitation is used for the 1st, 2 time of next lixiviating matting;

(3) reclaim snowmelt

Agar adhesive tape after freezing placed in the pond that thaws thaw, snowmelt is recovered to the pond that thaws, after filtration, precipitation, and then be used in the cleaning the 6th, 7 times of lixiviating treating processes, or be used in the cleaning the 1st, 2 times in the bleaching process again and soak in the 1st time.

Water-saving result of the present invention is obvious, and water-saving rate reaches 52.4% when producing the strip product, and water-saving rate reaches 31.3% when producing the powder product, to protection water resources, the bigger meaning that saves production cost, should promote the use of.

Description of drawings

Fig. 1 is a production scheme of the present invention.

Embodiment

As shown in Figure 1, fragrant plant mentioned in ancient texts is added in the alkali lye of 20-30%, in 60-65 ℃, handled 12 hours, drain alkali lye after the taking-up as far as possible.The water that adds 7 times of weakly alkaline ponds is (with the fragrant plant mentioned in ancient texts dry weight basis, below identical) soak a little, stir the back draining, totally 2 times, clean 3 times with the water in 7 times of slightly acidic ponds then at every turn, pH was between 6.0-7.5 when the 5th added water, between in stir, soak that pH goes back up to about 10.0-11.0 after 1 hour, draining, add the water in the pond that thaws when cleaning for the 6th, 7 time after, stir in, soaked 1-2 hour, pH is basicly stable about 6.5-8.0, does not go back up to higher pH value, can carry out next operation.6th, water filtration, the post precipitation that cleans discharging for 7 times is recovered to the weakly alkaline pond, contains impurity such as many mud, sand, shell before the 5th, so do not reclaim.

The water that in Bellmer, adds 7 times of ponds that thaw, adding hydrochloric acid accent pH is about 3.0, fragrant plant mentioned in ancient texts is poured in the Bellmer, stir slightly soon, constantly add small amount of hydrochloric acid and keep sodium hypochlorite solution pH about 4.0, time 3-5 minute to the fragrant plant mentioned in ancient texts deliquescing, add an amount of clorox then while stirring, handled about 5-10 minute, add small amount of hydrochloric acid again sodium hypochlorite solution pH is remained on about 4.0, add an amount of Sulfothiorine dechlorination, draining; Each water that adds 7 times of ponds that thaw cleans, Rapid Cleaning 2 times, the water logging that adds 7 times of ponds that thaw is then steeped 1 time, then soak 2 times with 7 times of tap water, each timed interval 1-2 hour, pH was 6.0-6.5 during the 1st immersion, and pH falls back to 5.5-6.0 about 1 hour, soak the basicly stable no longer falling between 6.0-6.5 of pH for the 3rd time, fragrant plant mentioned in ancient texts can be pulled out.The discharge water that soaks for 3 times after filtration, post precipitation is recovered in the slightly acidic pond, contains higher various chemical substances in the 1st, 2 time the discharge water, and smell is big, the more recovery value of foam is little.

Fragrant plant mentioned in ancient texts after will bleaching is dropped in 20 times of boiling water and carries glue, and different fragrant plant mentioned in ancient texts gel contents have bigger difference, puies forward the glue water consumption about 15-30 times, about 30 minutes of time; After filtration, sabot, cool off, push away bar, under-18 ℃ of temperature freezing 24-36 hour (producing the strip product), or press dewatering is pulverized (production powder-like product).

The freezing adhesive tape that meets the requirements of is placed in the pond that thaws that has been added with 30-40 times of water in batches and thaws, put bar simultaneously and dry, snowmelt after filtration, post precipitation is discharged to the pond that thaws, and uses in lixiviating or the bleaching process again.

Carry out concrete test with fragrant plant mentioned in ancient texts below:

In the alkali lye with 150 kilograms of fragrant plants mentioned in ancient texts addings 20%, in 60-65 ℃, handled 12 hours, drain alkali lye after the taking-up as far as possible.

1.0 cubic metres in each water that adds the weakly alkaline pond is the draining after the soaking and stirring a little, totally 2 times, this moment, the pH value was reduced to 7.0-8.0, used the water in slightly acidic pond to clean 3 times for 1.0 cubic metres then at every turn, p H was between 6.0-7.5 when the 5th added water, between in stir, soak that pH goes back up to about 10-11 draining after 1 hour, 6th, add the water in the pond that thaws for 7 times after, between in stir, soaked 1-2 hour, pH is basicly stable about 6.5-8.0.6th, the water that cleans discharging for 7 times after filtration, post precipitation is recovered to the weakly alkaline pond.

The water that adds 1.0 cubic metres of ponds that thaw in the Bellmer, adding hydrochloric acid accent pH is about 3.0, in the fragrant plant mentioned in ancient texts Bellmer of falling people, stir slightly soon, constantly add small amount of hydrochloric acid, keep sodium hypochlorite solution pH about 4.0, time 3-5 minute to the fragrant plant mentioned in ancient texts deliquescing, add an amount of clorox then while stirring, handled 5-10 minute, and added small amount of hydrochloric acid again, sodium hypochlorite solution pH is remained on about 4.0, add an amount of Sulfothiorine, draining; The 1.0 cubic metres of cleanings of water that add the pond that thaws fast, clean altogether 2 times, the water that adds the pond that thaws then soaks 1 time for 1.0 cubic metres, then soak 2 times with 1.0 cubic metres of tap water at every turn, the timed interval is to change 1 time water in 1-2 hour, and pH is 6.0-6.5 when soaking for the 1st time, and pH falls back to 5.5-6.0 after 2 hours, pH is basicly stable when soaking for the 3rd time no longer falls after rise between 6.0-6.5, fragrant plant mentioned in ancient texts can be pulled out.The discharge water that soaks for 3 times after filtration, post precipitation is recovered in the slightly acidic pond.

Fragrant plant mentioned in ancient texts dropped in 3.0 cubic metres the boiling water and carry glue, about 30 clocks of time, after filtration, sabot, cool off, push away bar, under-18 ℃ of temperature freezing 24-36 hour (producing the strip product), or press dewatering is pulverized (production powder-like product).

The freezing agar adhesive tape that meets the requirements of is placed in two ponds that thaw that are added with 2.5 cubic metres of water respectively in batches and thaws, pull the pendulum bar out and dry, snowmelt after filtration, post precipitation is discharged to the pond that thaws and reclaims.

Discharge water basic condition table

The pond	The weakly alkaline pond	The slightly acidic pond	The pond thaws
				Project
Reclaim the water yield (M 3)	2.0	3.0	7.8 *
				PH value	7.5～8.5	4.7～6.0	6.0～6.5
The recycle-water outward appearance	Faint tawny suspended substance is more	Faint yellow a little a small amount of suspended substance	Transparency well is with not obvious faint yellow have a small amount of little Huang, white suspension thing a little

Though passed through filtration after carrying glue, the fragrant plant mentioned in ancient texts residue and thaw after adhesive tape absorbed certain moisture.In the whole production flow process, produce 21 cubic metres of strip product waters, recycle 11 cubic metres, water-saving rate 52.4%; Produce 16 cubic metres of powder-like product waters, recycle 5 cubic metres, water-saving rate 31.3%.Calculate with the small processing factory that the more scale in ground such as Guangdong, Guangxi, Hainan is handled about 300 tons of fragrant plants mentioned in ancient texts in year, can economize on water every year 2.2 ten thousand steres (lyophilization) or 1.0 ten thousand steres (press dewatering), economic benefit and social benefit are all very outstanding.

Claims (1)

1, a kind of water-saving method when fragrant plant mentioned in ancient texts is carried out processing agar is characterized in that comprising the steps:

(1) reclaims lixiviating and clean the alkalescent water that produces

Fragrant plant mentioned in ancient texts after the alkaline purification is added water clean 1-7 time, clean the 1-5 time, pH and be discharged in the treatment tank, emit after treatment greater than 7.5 water; Clean the 6th, 7 time the water and the water of immersion and be recovered to the weakly alkaline pond, pH is stabilized in 6.5-7.5, the cleaning the 1st, 2 times of lixiviating matting when being used for after filtering producing next time;

(2) weakly acidic water behind the recovery cleaning bleaching fragrant plant mentioned in ancient texts

Fragrant plant mentioned in ancient texts after the bleaching is added water clean the 1-2 time, sodium hypochlorite solution, cleaning the 1st, 2, pH are discharged in the treatment tank less than 5.5 water, emit after treatment; Soak 1-3 time then, the timed interval is to change water one time in 1-2 hour, and pH is stabilized in 6.0-6.5, and the water that soaks the 1st, 2,3 time is recovered in the slightly acidic pond, after filtration, post precipitation is used for the 1st, 2 time of next lixiviating matting;

(3) reclaim snowmelt

Agar adhesive tape after freezing placed in the pond that thaws thaw, snowmelt is recovered to the pond that thaws, after filtration, precipitation, and then be used in the cleaning the 6th, 7 times of lixiviating treating processes, or be used in the cleaning the 1st, 2 times in the bleaching process again and soak in the 1st time.