CN205803169U - A kind of algin production waste water recycling system - Google Patents

Abstract

A recycling system for alginate production wastewater, which belongs to the technical field of aquatic products processing and environmental protection, and includes a settling unit, a flocculation unit, a plate and frame filter unit, a microfiltration unit, an ultrafiltration unit, a reverse osmosis unit and an ultrafiltration concentrated water storage tank Among them, the settling unit, flocculation unit, plate and frame filter unit, microfiltration unit, ultrafiltration unit, and reverse osmosis unit are connected through water pipes in sequence; the ultrafiltration dope storage tank unit is connected with the ultrafiltration unit and the flocculation unit; The new structure is simple, the treatment cost is low, and the treatment cost is 1.5-2.1 yuan/ton, which saves a lot of cost compared with the use of tap water; the utility model can remove calcium, magnesium, sodium ions, and chloride ions, and the removal rate is over 90%, and the treatment effect is good , The wastewater recovery rate is 50% to 60%, effectively removing organic matter, sodium ions and calcium ions in the wastewater, which can meet the water requirements for alginate production, and finally the concentrated water treated by the reverse osmosis membrane reaches the discharge index.

Description

A recycling system for alginate production wastewater

technical field

The utility model belongs to the technical field of aquatic product processing and environmental protection, and in particular relates to a recycling system for alginate production wastewater.

Background technique

Alginate is extracted and produced from brown algae. The production process consumes a lot of water. The production of 1 ton of alginate requires 800-1200 tons of fresh water. At the same time, acid-base and calcium salts are used in the production process, resulting in high salt content in waste water. Complex, biochemical treatment is difficult. At present, the treatment of alginate production wastewater adopts the aeration biochemical method. After treatment, the wastewater cannot be reused and needs to be treated again by sewage treatment plants. Enterprises need to bear huge sewage treatment fees. Patent 200610069057.2 uses a variety of technologies to treat alginate wastewater, including pretreatment, decalcification, cyclic oxidation, filtration, biological oxidation, protein treatment, and reverse osmosis treatment of waste calcium water, which can reuse calcium waste water. This method is complicated to operate, consumes a lot of power, and the cost of water treatment is high, so it cannot meet the production needs. Therefore, there is an urgent need for a low-cost, economical and practical alginate production wastewater recycling system to achieve the goals of saving water, protecting the environment, and improving economic benefits for enterprises.

Contents of the invention

The technical problem to be solved by the utility model is to provide a recycling system for alginate production wastewater, realize partial recycling of alginate production wastewater, save water, protect the environment, and the system of the invention is simple in operation, low in treatment cost, economical and practical.

The utility model is realized through the following technical solutions:

A recycling system for alginate production wastewater, which includes a sedimentation unit, a flocculation unit, a plate and frame filter unit, a microfiltration unit, an ultrafiltration unit, a reverse osmosis unit, and an ultrafiltration concentrated water storage tank;

Among them, the settling unit, flocculation unit, plate and frame filter unit, microfiltration unit, ultrafiltration unit, and reverse osmosis unit are connected through water pipes in sequence; the ultrafiltration concentrated liquid storage tank unit is connected with the ultrafiltration unit and the flocculation unit;

Alginate production wastewater is first collected in the settling unit, and settles through the inclined plate settling tank to remove part of the suspended solids and impurities; after the settled wastewater enters the flocculation unit, the flocculant polyacrylamide is added to the flocculation unit, and after mixing, the Flocculation and sedimentation; the waste water after flocculation and sedimentation enters the plate-and-frame filter press unit, and the plate-and-frame filter press is used for press filtration; the press-filtered water enters the microfiltration unit for microfiltration treatment; the microfiltration water enters the ultrafiltration unit for ultrafiltration Treatment, the ultrafiltration concentrated water is stored in the ultrafiltration concentrated water tank storage unit, and then enters the flocculation unit for further treatment; the ultrafiltration water enters the reverse osmosis unit for reverse osmosis treatment, the reverse osmosis concentrated water is discharged up to the standard, and the permeated water is recycled.

The utility model has the beneficial effects compared with the prior art:

The utility model has the advantages of simple structure, low treatment cost, and the treatment cost is 1.5-2.1 yuan/ton, which saves a lot of cost compared with the use of tap water; The effect is good, the wastewater recovery rate is 50% to 60%, and the organic matter, sodium ion and calcium ion in the wastewater are effectively removed, which can meet the requirements of alginate production water, and finally the concentrated water treated by the reverse osmosis membrane reaches the discharge index .

Description of drawings

Fig. 1 is a schematic diagram of a recycling system for alginate production wastewater of the present invention: settling unit 1, flocculation unit 2, plate and frame filter unit 3, microfiltration unit 4, ultrafiltration unit 5, reverse osmosis unit 6 and ultrafiltration concentration Water storage tank7.

detailed description

The technical scheme of the utility model will be further explained below through the embodiments in conjunction with the accompanying drawings, but the protection scope of the utility model is not limited in any form by the embodiments.

Example

A recycling system for alginate production wastewater, which includes a settling unit 1, a flocculation unit 2, a plate and frame filter unit 3, a microfiltration unit 4, an ultrafiltration unit 5, a reverse osmosis unit 6 and an ultrafiltration concentrated water storage tank 7.

Among them, the settling unit 1, the flocculation unit 2, the plate and frame filter unit 3, the microfiltration unit 4, the ultrafiltration unit 5, and the reverse osmosis unit 6 are sequentially connected through water pipes; the ultrafiltration dope storage tank unit 7 is connected with the ultrafiltration unit 5 and Flocculation unit 2-unit connected;

The above-mentioned system is used to treat the alginate production wastewater. Before the treatment, the COD of the alginate production wastewater is 640 mg/L, the hardness is 53 German degrees, and the salinity (calculated as sodium chloride) is 0.2%. The specific processing steps are as follows:

(1) The alginate production wastewater is collected in the settling unit 1, and settled in the inclined plate settling tank to remove part of the suspended solids and impurities and reduce the COD in the wastewater.

(2) The settled wastewater then enters the flocculation unit 2, where the flocculant polyacrylamide is added in an amount of 40mg/L water body, and then flocculated and settled after mixing.

(3) The waste water after flocculation and sedimentation enters the plate and frame filter press unit 3 for press filtration.

(4) The press-filtered water enters the microfiltration unit 4 for microfiltration treatment to remove solids not removed during the plate-and-frame press-pressing process to ensure the quality of ultrafiltration influent water.

(5) The microfiltration water enters the ultrafiltration unit 5 for ultrafiltration treatment, and the ultrafiltration concentrated water is stored in the ultrafiltration concentrated water tank storage unit 7, and then enters the flocculation unit 2 for further processing.

(6) The ultrafiltered water then enters the reverse osmosis unit 6 for reverse osmosis treatment, the concentrated reverse osmosis water is discharged up to the standard, and the permeated water is recycled.

The clear water treated in this embodiment has a COD of 11 mg/L, a hardness of 0.7 German degrees, and a salt content (calculated as sodium chloride) of 0.01%. The COD of reverse osmosis concentrated water is 10 mg/L (meeting discharge requirements), and the waste water treatment cost of sodium alginate production in this embodiment is 1.5-2.1 yuan/ton of water.

Claims (1)

1. A system for recycling waste water from alginate production, which includes a settling unit, a flocculation unit, a plate and frame filter press unit, a microfiltration unit, an ultrafiltration unit, a reverse osmosis unit and an ultrafiltration concentrated water storage tank; wherein the settling unit, the flocculation unit The unit, plate and frame filter unit, microfiltration unit, ultrafiltration unit, and reverse osmosis unit are connected through water pipes in sequence; the ultrafiltration concentrate storage tank unit is connected with the ultrafiltration unit and the flocculation unit; Alginate production wastewater is first collected in the settling unit, and settles through the inclined plate settling tank to remove part of the suspended solids and impurities; after the settled wastewater enters the flocculation unit, the flocculant polyacrylamide is added to the flocculation unit, and after mixing, the Flocculation and sedimentation; the waste water after flocculation and sedimentation enters the plate-and-frame filter press unit, and the plate-and-frame filter press is used for press filtration; the press-filtered water enters the microfiltration unit for microfiltration treatment; the microfiltration water enters the ultrafiltration unit for ultrafiltration Treatment, the ultrafiltration concentrated water is stored in the ultrafiltration concentrated water tank storage unit, and then enters the flocculation unit for further treatment; the ultrafiltration water enters the reverse osmosis unit for reverse osmosis treatment, the reverse osmosis concentrated water is discharged up to the standard, and the permeated water is recycled.