SU833584A1 - Method of treatment of waste water precipitate - Google Patents

Description

The invention relates to methods for wastewater treatment and is intended for the treatment of sewage sludge.

Currently, for the treatment of sewage sludge, sludge digestion is mainly used in digesters, followed by dehydration in the mechanical dewatering workshop, or on sludge sites.

Known method in which digested sludge fed to pryvku then compacted in structures ,, operating on the principle, the gravitational compacting and then treated with the reagent and dewatered on a suction fil- ^'3 bang, centrifuge or filter presses [11.

This method of processing sludge is highly productive, but has a number. ’Drawbacks, namely: the complexity of the techno - '*' * 'logical scheme; the need for preliminary treatment of the sediment with reagents;

the need for complex expensive. equipment, highly qualified staff.

The closest in technical essence and; the achieved result to the proposed is a method of processing sludge on silt sites. Sludge fermented in digesters, served.

to silt sites, where it is dehydrated and dried [2].

However, the load on the silt sites is low, and therefore, their productivity is low. Therefore, silt sites occupy large areas and the capital costs of their construction are significant. *

The purpose of the invention is to increase the performance of sludge pads by reducing the moisture content of sediment.

This goal is achieved by the fact that the sediment fermented in digesters · is subjected to flotation compaction before being fed to silt sites.

The method is as follows.

Sewage sludge is digested in a digester, then it is compacted in a flotator and fed to sludge sites. During the flotation compaction process, the fermented sludge is saturated with air, which positively affects its moisture-removing properties. Sludge yield increases and its dehydration rate increases. An increase in the rate of sludge dewatering allows increasing the load on the sludge sites, and therefore, increasing their productivity.

Example Sewage sludge is digested in a digester. The volume of sediment after fermentation is 200 m / day, humidity 98%. The flotation cake is then compacted. The moisture content of the compacted sediment 93%, the volume of sediment. 57 musut. Compacted sediment serves ^e on sludge beds.

Table 1 presents the results of compaction, namely: a decrease in the moisture content of the sludge during its flotation packing θ with different recirculation ratios of the working fluid and sludge.

Table 1

Duration of compaction, min Humidity of sediment during recirculation ratio,% 1:10 1: 6.7 1: 5,6 1: 5 0 98.6 98.6 98.6 98.6 5 94.5 92.8 9 3.4 94.0 Yu 92.1 92.0 92.7 92.2 20 92.1 91.9 92.1 92.2 thirty 92.1 91.9 92.1 92.2

The duration of dewatering of compacted sludge in a laboratory model of a sludge site is 1.1 - 1.2 times less than that of a non-compacted one.

In the table. 2 presents comparative data of the proposed and known methods for processing sludge.

table 2

Indicators Way 40 proposed j famous The amount of sediment after fermentation, musut 200 200 45 The moisture content of the sediment after fermentation,% 98 98

Continuation of the table. 2 ι

Way Indicators -------------1 proposed famous

Humidity of sludge fed to silt sites,%

98

The volume of sediment fed to silt ki,

200

Useful area of silt sites, m ^2, 17337

60833

As a result of flotation compaction of sludge, the area of sludge pads can be reduced by 4–5 times due to an increase in productivity and a decrease in the volume of sludge supplied for dewatering.

The cost of dehydration and drying m ^ sludge according to the proposed method is approximately 1.5 to 2 times lower compared to the known.

Claims (2)

(54) METHOD FOR TREATMENT OF WASTEWATER SEDIMENTS Note. Drainage of wastewater is subject to clearing in a methane tank. OIOL ayADka after SARAW 200 vcyT, humidity 98%. Then, the flotation sediment is compacted. 93% of compacted sludge, volume of residuals 57 musut. Compacted sludge is fed to sludge beds. Tab.1 presents the results of compaction, namely; a decrease in the moisture of osgchka during its flotation consolidation with a different recirculation ratio of working fluid and sediment. Table 1 98.6 98.6 98.6 98.6 Duration of dewatered compacted sludge on the laboratory model of the sludge bed is 1.1 - 1 times less than the unconsolidated. In tab. Table 2 presents the comparative data of the proposed and known methods of sludge treatment. Table Method Parameters proposed volume Weak sediment volume after fermentation, musculature EXTENSION of sediment after fermentation,% Continued table. 2 Volume of sediment supplied to sludge pods, 57 200 Useful area of sludge beds, m 17337 60833 As a result of flotation sludge settlement, the area of sludge plots can be reduced by 4-5 times by increasing the capacity and reducing the volume of sludge supplied to dewatering. The cost of dehydration and drying of 1 m of sediment by the proposed method is approximately 1.5 - 2 times lower compared with the known. Claims The method of treating sewage sludge, including digestion in digesters and dewatering at sludge sites, is characterized in that, in order to increase sludge production capacity by reducing the moisture content, the sludge is subjected to flotation compaction after fermentation. Sources of information taken into account in the examination 1. SV Yakovlev and others. Sewers. M., stroiizdat, 1972, p. 168-173, 2. In the same place, pp. 165-168.