RU2228304C1 - Water treatment process - Google Patents

Abstract

FIELD: water treatment. SUBSTANCE: process of clearing and cleaning natural water comprises saturation of original water with gaseous oxidant, modifying treatment of filter charge with original water, and subsequent filtration of original water through treated charge. According to invention, before modifying treatment, water is supplemented by potassium permanganate and filter charge utilized is composition of granulated material containing no ore than 90% quartz sand and no more than 50% Mn(II) oxide-based catalyst, the rest being adsorbent based on iron, magnesium, manganese, and silicon oxides. EFFECT: reduced filter charge treatment time and increased water clarification degree with preserving considerable amount of humin substances. 4 cl, 6 ex

Description

The invention relates to the field of natural water treatment.

A known method of clarification and purification of water, comprising the use of a filter having the sorbent properties of a granular material modified with a reagent layer as a loading (SU No. 1198016, C 02 F 1/64, 1985).

The disadvantage of this method is the need to extract the filter load for processing granular material and restore the properties of the reagent layer.

The technologically more advanced and closest analogue to the claimed one is a method of clarifying and purifying water, which includes the use of a filter having sorbent properties of mineral granular material as a feed, saturation of the feed water with a gaseous oxidizing agent, modifying the treatment of the filter feed with feed water and subsequent filtration of the feed water through the treated feed ( RU No. 2046764, C 02 F 1/64, 1995).

The implementation of this method involves either a modifying treatment of significant duration or the presence of mineral granular material that has already undergone a modifying treatment with a similar source water composition. Mentioned ultimately significantly increases the cost of water treatment and in addition worsens the degree of water purification, especially with a significant content of humic substances.

The problem to which the invention is directed, is the creation of a cost-effective method of water treatment.

The technical result that can be obtained by carrying out the invention is to reduce the processing time of the filter load and to increase the degree and reagentless discoloration of water with a significant content of humic substances.

The specified technical result is achieved by the method of clarification and purification of water, including the use of a filter having sorbent properties of mineral granular material as a feed, saturation of the feed water with a gaseous oxidizing agent, modifying the treatment of the filter feed with feed water and subsequent filtration of the feed water through the treated feed, due to the fact that potassium permanganate is introduced into the feed water for the modifying treatment of the charge, while approx. they change the composition of the granular material containing silica sand, a catalyst based on Mn (II) oxide and an adsorbent based on oxides of iron, magnesium, manganese and silicon in the following ratio of components, wt.% silica sand - not more than 90, catalyst - not more than 50, adsorbent - the rest.

And also due to the fact that the content of potassium permanganate in the source water for the modifying treatment of the charge is adjusted to 1.0-100.0 mg / L.

And also due to the fact that the modifying processing of the filter load is carried out by filling it with source water at a speed of 0.05-1.0 m / h and subsequent exposure for 2-24 hours.

And also due to the fact that the filling of the filter load with source water is carried out until the thickness of the source water layer is reached above the load value of 0.3-9 of the height of the load layer.

The method is as follows

A filter loading is formed from mineral granular material with sorbent properties, for example, with a grain size of 0.5-3.0 mm, using a composition of granular material containing quartz sand (for example, “Milk and White Quartz of the Khrustalnaya Mountain Deposit” TU 571726-002- 45588031 ), a catalyst based on Mn (II) oxide (for example, Granosit P TU 0731-003-23360385-2001) and an adsorbent based on iron, magnesium, manganese and silicon oxides (for example, Granular material MZhF TU 4059-001 -53232176-2000) in the following ratio of components, wt.%: Quartz sand - not more than 90, catalyst - not more than 50, adsorbent - the rest Source water from a natural source directed from bottom to top is forced out from the pore volume of the loading of gaseous substances and the elimination of air congestion When the thickness of the source water layer above the charge reaches 1.2- 2.5 height of the loading layer in the source water is introduced potassium permanganate with bringing its content to 1.0-100.0 mg / l in the volume of the specified layer. For the modifying treatment of the charge, the pore space of the charge is filled, saturated with a gaseous oxidizing agent (for example, aeration or ozonation), with source water with potassium permanganate from the bed above the charge with a filtration rate of 0.05-1.0 m / h. water, determined by the equality of the color of the incoming and outgoing water, the filtration is stopped and subsequent loading is carried out for 2-24 hours. In this case, as a result of the interaction of potassium permanganate, alizatora, adsorbent of organic matter and initial water in the pore space on the surface of the particulate material actively stable structure is formed. Subsequent filtration of the source water through the charge thus treated ensures efficient separation of organic (humic) substances and reagentless discoloration of the water.

The regeneration of loading properties can be carried out by repeating the cycle of modifying processing of the loading without removal and replacement.

The effectiveness of the treatment and clarification of water is illustrated by the following examples.

Example 1. Source water with a turbidity of 4 mg / l, color - 120 degrees and an iron content of 0.8 mg / l is filtered at a speed of 0.8 m / h through a granular charge 800 mm high from quartz sand - 90%, catalyst - 5%, the adsorbent - the rest, treated with source water containing 30 mg / l potassium permanganate with exposure for 20 hours. Quality indicators of purified water: turbidity - 0.6 mg / l, color - 15 degrees, iron content - 0.2 mg / l.

Example 2. Source water with a turbidity of 4 mg / l, color - 120 degrees and an iron content of 0.8 mg / l is filtered at a speed of 0.8 m / h through a granular load 800 mm high from quartz sand - 10%, catalyst - 5%, adsorbent - the rest treated with source water containing 20 mg / l potassium permanganate with exposure for 12 hours Quality indicators of purified water: turbidity - 0.5 mg / l, color - 12 degrees, iron content - 0, 11 mg / l

Example 3. The source water with a turbidity of 4 mg / l, color - 120 degrees and an iron content of 0.8 mg / l is filtered at a speed of 0.8 m / h through a granular charge 900 mm high from quartz sand - 20%, catalyst - 50%, adsorbent - the rest, treated with source water containing 20 mg / l potassium permanganate with exposure for 12 hours. Quality indicators of purified water: turbidity - 0 mg / l, color - 0 degrees, iron content - 0.03 mg / l.

Example 4. The source water with a turbidity of 4 mg / l, color - 120 degrees and an iron content of 0.8 mg / l is filtered at a speed of 1.5 m / h through a granular load with a height of 800 mm from quartz sand - 20%, catalyst - 5%, adsorbent - the rest treated with source water containing 20 mg / l potassium permanganate with exposure for 12 hours Quality indicators of purified water: turbidity - 0.2 mg / l, color - 5 degrees, iron content - 0, 1 mg / l.

Example 5. The source water with a turbidity of 4 mg / l, color - 120 degrees and an iron content of 0.8 mg / l is filtered at a speed of 0.8 m / h through a granular charge 800 mm high from quartz sand - 95%, catalyst - 5%, treated with source water containing 30 mg / l potassium permanganate with exposure for 20 hours. Quality indicators of purified water: turbidity - 2.0 mg / l, color - 25 degrees, iron content - 0.4 mg / l.

Example 6. The source water with a turbidity of 4 mg / l, color - 120 degrees and an iron content of 0.8 mg / l is filtered at a speed of 0.8 m / h through a granular charge 800 mm high from quartz sand - 40%, catalyst - 60%, treated with feed water containing 20 mg / l potassium permanganate with exposure for 20 hours. Quality indicators of purified water: turbidity - 2.8 mg / l, color - 18 degrees, iron content - 0.1 mg / l.

Claims (4)

1. A method of treating water, comprising using as a feed a filter having sorbent properties of a mineral granular material, saturating the feed water with a gaseous oxidizing agent, modifying the treatment of the feed of the filter with feed water and then filtering the feed water through a treated feed, characterized in that the feed water for modifying processing of the load is introduced potassium permanganate, while the composition of the granular material containing aschuyu quartz sand, based catalyst Mn oxide (II) and adsorbent based on oxides of iron, magnesium, manganese and silicon in the following ratio, wt%: Quartz sand - not more than 90, the catalyst - not more than 50, the adsorbent - the rest.. 2. The method according to claim 1, characterized in that the content of potassium permanganate in the source water for the modifying treatment of the charge is adjusted to 1.0-100.0 mg / L. 3. The method according to claim 1 or 2, characterized in that the modifying processing of the filter load is carried out by filling it with source water at a filtration rate of 0.05-1.0 m / h and subsequent exposure for 2-24 hours 4. The method according to one of claims 1 to 3, characterized in that the filling of the filter loading with the source water is carried out until the thickness of the source water layer is reached above the loading of a value of 0.3-9 of the height of the loading layer.