RU2238787C1 - Loading of a contact filter for natural waters purification - Google Patents

Abstract

FIELD: production of drinking water.

SUBSTANCE: the invention is dealt with the field of treatment of natural waters for production of drinking water and it may be used at water sewage treatment plants, structures for after-purification of sewage water and at other public utilities. Loading of a contact filter contains as an upper layer a filtrating sorption material - ОДМ-2Ф mark inoculated fragmentized molding boxes with a granular size of 2.3-3.5 mm and density of 1.35 kg/m³, in the capacity of interlayer - fragmentized anthracite with a granular size of 1.5-2.3 mm and density of 16 kg/m+3, and as a low layer - sand with a granular size of 0.7-1.5 mm and density of 2.6 kg/m³. The invention ensures production of standard condition potable water with high efficiency.

EFFECT: the invention ensures production of standard condition potable water with high efficiency.

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Description

The invention relates to the field of preparation of water for drinking purposes. The load can be used at water treatment plants, wastewater treatment plants and other public utilities.

The technical solution “Two-layer loading for a contact filter KF-2” is known, designed to produce drinking water (Designer Handbook “Water Supply for Populated Places and Industrial Enterprises” / Ed. By engineer I. A. Nazarov, - M .: Stroyizdat, 1977). This download contains a layer of silica sand with a grain size of 0.7-1.5 mm and a layer of crushed anthracite with a grain size of 0.8-1.8 mm.

The disadvantage of this load is that when it is used in contact filters, the filtrate turbidity at the outlet is 1.5 mg / dm ³ , which, given the current extreme deterioration of water supply networks, is quite large.

The closest technical solution is “Three-layer loading for contact filter KF-5”. This download contains quartz sand with a grain size of 0.7-1.25 mm, agloporite with a grain size of 1.25 - 2.3 mm and expanded clay with a grain size of 2.3-3.3 mm (Designer Handbook “Water supply to populated areas and industrial enterprises” / Pod Edited by engineer I.R. Nazarov, - M .: Stroyizdat, 1977).

When using this load in contact filters, the filtering speed is 9 m / s. Such a filtration rate is insufficient for modern high-tech water treatment plants. In addition, the turbidity of the filtrate at the outlet of the contact filter is also 1.5 mg / DM ³ .

The task of the invention is to obtain high quality drinking water, increasing the performance of contact filters.

The task is achieved in that the contact filter loading for the purification of natural waters contains a layer of quartz sand, and an additional filtering sorbent material is introduced as an upper layer - flask crushed modified grades ODM-2F with a grain size of 2.3-3.5 mm and a density of 1 , 35 kg / m ³ (Certificate of Conformity No. РОСС RU.ПБО3. НОО859; Sanitary and Epidemiological Conclusion No. 66.01.15.216.11.000102.08.02; Patent for invention No. 2141374 “Method for producing sorbent” according to application No. 98122486 dated December 15, 1998. ), as the middle layer - anthracite is crushed It was grained with a grain size of 1.5-2.3 mm and a density of 1.6 kg / m, and the lower layer of sand was used with a grain size of 0.7-1.5 mm and a density of 2.6 kg / m ³ .

The pre-washed and sorted load is poured into the contact filter housing in layers: sand, crushed anthracite and filtering sorbent material - flasks, crushed, modified ODM-2F grades. Next, the load is poured with water and kept soaked for 2 days, after which the load is flushed with reverse current (from bottom to top) with an intensity that provides a 50% expansion of the entire layer of filtering materials.

After washing, purified water is fed to the load. The productivity of the load compared with the analogue and prototype increases by 1.6-1.7 times, since the filtering speed is 15 m / h Moreover, the turbidity of the filtrate throughout the filter cycle lies in the range of 0.2-0.3 mg / dm ³ , which is 5-7.5 times lower in comparison with the analogue and prototype.

This load also has a higher dirt capacity than the analogue and prototype, as a result of which the duration of the filter cycle increases, which in turn contributes to the saving of clean water and the energy needed to flush the load.

In addition, when using flask modified ODM-2F modified grades of material, which have higher adsorption properties than sand and anthracite, a deeper effect of water purification is noted for the following indicators: hardness, calcium, sodium, chlorides, sulfates, dry residue, petroleum products.

Claims (1)

Loading a contact filter for treating natural waters, containing a layer of silica sand, characterized in that the loading additionally includes a filtering sorbent material as a top layer - flask shredded modified grades ODM-2F with a grain size of 2.3-3.5 mm, as an average the anthracite layer is crushed with a grain size of 1.5-2.3 mm, and the lower quartz sand layer is used with a grain size of 0.7-1.5 mm with an equal ratio of components.