Solid composite polymeric ferric sulfate flocculant and preparation thereof

Abstract

The invention provides a solid composite polymeric ferric sulfate flocculating agent used in the treatment of high-concentration organic starch wastewater. The flocculating agent takes ferrous sulfate and sodium bentonite as raw materials and sulphuric acid and hydrogen peroxide as oxidizing agents, is obtained after oxidative polymerization, aging, concentrating and settling, and is a straw yellow solid which has stable performance and is convenient for storage and transportation; during the treatment of high-concentration organic starch wastewater, the flocculating agent ensures quick settling velocity of floc, compact floc, excellent deodorization effect, relatively high removal rate of COD and large removal value of COD, and has high use value; the flocculating agent has low energy consumption during preparation; moreover, the flocculating agent has the advantages of cheap and easily obtained raw materials, low cost, simple device and process and convenient operation, and is easy to realize industrial production.

Description

technical field

[0001] The invention belongs to the technical field of water treatment, and relates to a polymeric ferric sulfate flocculant used in water treatment technology, in particular to a solid composite polymeric ferric sulfate flocculant and a preparation method thereof. This product is mainly used in the treatment of high-concentration organic starch wastewater as a purifying agent for the pretreatment of starch wastewater. Background technique

[0002] In northern my country, potatoes are mostly used as raw materials to produce starch. In the starch production process, a large amount of high-concentration organic compounds and suspended matter acid wastewater are usually produced. The main components in wastewater are soluble starch and a small amount of protein, which are generally non-toxic, but the COD value is very high, usually 1000-30000mg / L, and the SS is 1500mg / L. If the wastewater is directly discharged into the water body environment, it will not only ...

Examples

Embodiment 1

[0029] Weigh 50.0g ferrous sulfate (FeSO 4 ·7H 2 O) and 0.5 g of sodium bentonite were added to the three-necked bottle, and then 25.0 g of distilled water was added, and electric stirring was performed for 5 min, and the mixture was evenly mixed. Add 9.0 g of 98% sulfuric acid dropwise; after the dropwise addition, stir for 3 min, then add 7.8 g of 30% H 2 o 2 solution; after the dropwise addition was completed, the reaction was stirred at room temperature for 1h. After the reaction is completed, let stand and age for 24 hours, concentrate under reduced pressure at 45°C to about half of the original volume to obtain a reddish-brown pasty pre-product, leave it for about 15 days to obtain a light yellow new solid composite polymeric ferric sulfate flocculant.

[0030] In the flocculation test, the dosage of the flocculant is 4g / L. When the COD value of the raw starch wastewater is 8831mg / L, the COD removal value of the treated water sample is 3328mg / L, and the removal rate i...

Embodiment 2

[0032] Weigh 50.0g ferrous sulfate (FeSO 4 ·7H 2 O) and 1.3g of sodium bentonite were added to the three-necked bottle, and then 25.0g of distilled water was added, and electric stirring was carried out for 5min, and the mixture was evenly mixed. Add 9.0 g of 98% sulfuric acid dropwise, stir for 3 min after the dropwise addition, and add 7.8 g of 30% H 2 o 2 After the solution was added dropwise, the reaction was stirred at room temperature for 1 h. After the reaction is completed, let it stand still, and after aging for 24 hours, concentrate at 45°C to about half of the original volume to obtain a reddish-brown pasty pre-product. After standing for about 15 days, a new light yellow solid composite polymeric ferric sulfate flocculant is obtained.

[0033] In the flocculation test, the dosage of flocculant is 4g / L. When the COD value of raw starch wastewater is 8831mg / L, the COD removal value of the treated water sample is 3875mg / L, and the removal rate is 43.9%.

Embodiment 3

[0035] Weigh 50.0g ferrous sulfate (FeSO 4 ·7H 2 O) and 1.8 g of sodium bentonite were added to a three-necked bottle, and then 25.0 g of distilled water was added, and electric stirring was performed for 5 min, and the mixture was evenly mixed. Add 9.0 g of 98% sulfuric acid dropwise, stir for 3 min after the dropwise addition, and slowly add 7.8 g of 30% H 2 o 2 After the solution was added dropwise, the reaction was stirred at room temperature for 1 h. After the reaction is completed, let it stand still and age for 24 hours, then concentrate at 45°C to about half of the original volume to obtain a reddish-brown paste-like pre-product, and leave it for about 15 days to obtain a light yellow new solid composite polymeric ferric sulfate flocculant.

[0036]In the flocculation test, the dosage of flocculant is 4g / L. When the COD value of raw starch wastewater is 8831mg / L, the COD removal value of the treated water sample is 4551mg / L, and the removal rate is 51.5%.

technical field

[0001] The invention belongs to the technical field of water treatment, and relates to a polymeric ferric sulfate flocculant used in water treatment technology, in particular to a solid composite polymeric ferric sulfate flocculant and a preparation method thereof. This product is mainly used in the treatment of high-concentration organic starch wastewater as a purifying agent for the pretreatment of starch wastewater. Background technique

[0002] In northern my country, potatoes are mostly used as raw materials to produce starch. In the starch production process, a large amount of high-concentration organic compounds and suspended matter acid wastewater are usually produced. The main components in wastewater are soluble starch and a small amount of protein, which are generally non-toxic, but the COD value is very high, usually 1000-30000mg / L, and the SS is 1500mg / L. If the wastewater is directly discharged into the water body environment, it will not only ...

Examples

Embodiment 1

[0029] Weigh 50.0g ferrous sulfate (FeSO 4 ·7H 2 O) and 0.5 g of sodium bentonite were added to the three-necked bottle, and then 25.0 g of distilled water was added, and electric stirring was performed for 5 min, and the mixture was evenly mixed. Add 9.0 g of 98% sulfuric acid dropwise; after the dropwise addition, stir for 3 min, then add 7.8 g of 30% H 2 o 2 solution; after the dropwise addition was completed, the reaction was stirred at room temperature for 1h. After the reaction is completed, let stand and age for 24 hours, concentrate under reduced pressure at 45°C to about half of the original volume to obtain a reddish-brown pasty pre-product, leave it for about 15 days to obtain a light yellow new solid composite polymeric ferric sulfate flocculant.

[0030] In the flocculation test, the dosage of the flocculant is 4g / L. When the COD value of the raw starch wastewater is 8831mg / L, the COD removal value of the treated water sample is 3328mg / L, and the removal rate i...

Embodiment 2

[0032] Weigh 50.0g ferrous sulfate (FeSO 4 ·7H 2 O) and 1.3g of sodium bentonite were added to the three-necked bottle, and then 25.0g of distilled water was added, and electric stirring was carried out for 5min, and the mixture was evenly mixed. Add 9.0 g of 98% sulfuric acid dropwise, stir for 3 min after the dropwise addition, and add 7.8 g of 30% H 2 o 2 After the solution was added dropwise, the reaction was stirred at room temperature for 1 h. After the reaction is completed, let it stand still, and after aging for 24 hours, concentrate at 45°C to about half of the original volume to obtain a reddish-brown pasty pre-product. After standing for about 15 days, a new light yellow solid composite polymeric ferric sulfate flocculant is obtained.

[0033] In the flocculation test, the dosage of flocculant is 4g / L. When the COD value of raw starch wastewater is 8831mg / L, the COD removal value of the treated water sample is 3875mg / L, and the removal rate is 43.9%.

Embodiment 3

[0035] Weigh 50.0g ferrous sulfate (FeSO 4 ·7H 2 O) and 1.8 g of sodium bentonite were added to a three-necked bottle, and then 25.0 g of distilled water was added, and electric stirring was performed for 5 min, and the mixture was evenly mixed. Add 9.0 g of 98% sulfuric acid dropwise, stir for 3 min after the dropwise addition, and slowly add 7.8 g of 30% H 2 o 2 After the solution was added dropwise, the reaction was stirred at room temperature for 1 h. After the reaction is completed, let it stand still and age for 24 hours, then concentrate at 45°C to about half of the original volume to obtain a reddish-brown paste-like pre-product, and leave it for about 15 days to obtain a light yellow new solid composite polymeric ferric sulfate flocculant.

[0036]In the flocculation test, the dosage of flocculant is 4g / L. When the COD value of raw starch wastewater is 8831mg / L, the COD removal value of the treated water sample is 4551mg / L, and the removal rate is 51.5%.