SU1331838A1 - Method of treating waste water sediments - Google Patents

Abstract

The invention relates to methods for treating sewage sludge, can be used for treating sludge, which forms during biological treatment of sewage, allows preserving the water-withdrawing properties of sludge during its accumulation, improves the productivity of sludge plots and cheapens the method due to the fact that compacted aerobic-stabilized The sediment is processed in successively changing aerobic and anaerobic conditions x for 0.5-10 days. With a duration of treatment in aerobic and anaerobic conditions 0.5-6 hours. 1 zp f-ly, 2 tab. & (L oo with CX) from 00

Description

sewage sludge treatment and can be used to treat sludges from biological wastewater treatment.

Workshop 1 of the invention is to preserve the drainage properties of the sludge during its accumulation, increase the productivity of sludge beds and reduce the cost of the process.

The method is carried out as follows.

The aerobic stabilization sediment is compacted for 6-8 hours to a moisture content of 97-96% and processed in successive aerobic and anaerobic regimes, the duration of aerobic and anaerobic treatment is 05.-6 h. The intensity of aeration of the sediment at the aerobic stage of process 1- 2 The total duration of such a processing of 0, 5–10 days, during which an accumulation of a significant amount of compacted siege of 25 0.5 hours takes place is also impractical, since

without deterioration of its water withdrawal properties, which allows to obtain a high efficiency of its dehydration. Submission to dehydration of a large amount of compacted sludge allows, in the case of natural dehydration, to collect the necessary sludge layer (1-1.5 m) on the sludge bed in one cast, eliminating filtration of sludge water through the layer of previously dehydrated sludge, which makes it possible to shorten the duration of filtration precipitation and increase the productivity of the sludge bed up to 6-8 m / m. 1.1-1.3 times. In the case of mechanical dewatering, the method allows the use of highly efficient dewatering devices for treating sludge, forming 28–10 cm / g) and is treated for 15 days in successive aerobic (0.3 h) and anaerobic ones. (0.4 hrs.) Conditions. Specific

small filtration resistance of the processed productivity.

The total duration of anaerobic-aerobic treatment is 0.5-10 days. With an increase in the total treatment time of 10 days, there is a sharp deterioration in the water returning properties of the sludge (the value of the specific resistance of the filter increases). At the same time, the minimum duration of treatment cannot be less than 0.5 days, based on the possibility of the duration of the anaerobic and aerobic stages of 6 hours each.

total sediment 91 cm / g.

The productivity of sludge beds during its dewatering is 2.5 m / M - year.

50 PRI mme R 2. The aerobic stabilization sludge is compacted for 8 hours to a moisture content of 96% (specific filtration resistance of the compacted sludge is 22–10 ° cm / g). It is then underwent treatment for 5 days in successively alternating aerobic (0.5 h) and anaerobic (0.5 h) modes. Specific filtration resistance of the spent sludge 23 to 10 cm / g.

Filter sediment resistance against the duration of anaerobic-aerobic treatment is given in Table. 1, The duration of aerobic treatment of compacted sludge over 6 hours leads to a gradual deterioration of its water withdrawal properties due to the auto-oxidation of the bacterial cells of the sediment. Staying sediment under anaerobic conditions for more than 6 hours also leads to deterioration of its water-withdrawing properties due to the development of anaerobic processes.

in flakes of aerobic stabilized sediment.

Conducting aerobic treatment for less than 0.5 hours does not allow the functional activity of aerobic sludge bacteria to be fully restored, which leads to disruption of sludge flake structure and, consequently, deterioration of its water withdrawal properties. The duration of the anaerobic stage is less than

despite the creation of anaerobic uye-. VIY (when disabling aeration) some dissolved oxygen remains in the stabilized sediment, i.e. the sediment is practically under aerobic conditions.

The dependence of the resistivity of the sediment filtration on the duration of aerobic or anaerobic treatment is given in Table 2.

Example 1. The aerobic-stabilized sediment is compacted for 6 hours to a moisture content of 96.5% (specific resistance to filtration of the sediment

28-10 cm / g) and processed for 15 days in successive aerobic (0.3 h) and anaerobic. (0.4 hrs.) Conditions. Specific

d filtering resistance processed

filtration resistance

total sediment 91 cm / g.

The productivity of sludge beds during its dehydration, 5 m / M - year.

PRI mme R 2. The aerobic stabilization sludge is compacted for 8 hours to a moisture content of 96% (specific filtration resistance of the compacted sludge is 22–10 ° cm / g). Then it is processed for 5 days in sequential alternating aerobic (0.5 h) and anaerobic (0.5 h) regimes. The resistivity of the filtration of the spent sludge 23 10 cm / g.

Performance of sludge beds 7.6. Consumption of reagents required for mechanical decontamination, 1.5% FeCl and 3% CaO.

PRI me R 3. The aerobic-stabilized sediment is compacted for 8 hours to a moisture content of 96%. Compacted sediment having a filtration resistivity of 25-10 ° cm / g is treated for 10 days under successively changing aerobic (3h) and anaerobic (3h) conditions. The filtration resistivity of the treated sludge is 2510 cm / g.

The performance of sludge sites 8 year.

EXAMPLE 4 The example is carried out analogously to example 3, but the duration of compaction of a precipitate is 6 hours, humidity 97%, and specific filtration resistance 25 10 ° cm / g. The duration of the aerobic stage of treatment is 6 hours, anaerobic 6 hours. The total duration of treatment is 0.5 days. The filtration resistivity of the treated sludge is 25-10 ° cm / g.

The productivity of sludge beds during its dehydration is 6 m / m –year. Consumption of reagents, necessary for mechanical dehydration, 1.6% - FeClj and 3.7% - CaO.

PRI me R 5. The aerobic-stabilized sediment is compacted for 7 hours to a moisture content of 96.5%. The compacted sediment with a filtration resistivity of 28–10 cm / g is processed for 5 days in sequential alternating aerobic (18 h) and anaerobic (10 h) regimes.

Total duration of anaerobic-aerobic treatment, day 0.5

Specific filtration resistance of treated sediment, 10 ° cm / g

The duration of the aerobic and anaerobic stages, respectively, each, h

The filtration resistivity of the treated sludge is 96-10 cm / g.

Performance sludge sites, 2.5.

The proposed method in comparison with the known ensures the preservation of the water-returning properties of compacted aerobic stabilized sediment in

its accumulation (up to 10 days), increasing the efficiency of dewatering, characterized by an increase in the productivity of sludge sites by 1.1-1.3 times: from 5-6 to

6-8 m, cheaper processing due to the reduction (1.2-1.4 times) of the number of sludge platforms and, therefore, land areas for roads, ramps, slopes of sites,

Claims (2)

1. A method of treating sewage sludge, including compaction of aerobic-stabilized sludge, aeration of compacted sludge, followed by dewatering on sludge beds, characterized in that, in order to preserve the water department sediment properties in the process of its accumulation, increasing the productivity of sludge beds and cheapening the process, compacted sediment is treated under successive aerobic and anaerobic conditions for 0.5-10 days. 2. Method POP.1, differing from that by the fact that the duration of treatment under aerobic and anaerobic conditions is 0.5-6 hours. Table 1 ten 15 22 19 21 22 20 91 13318386 Table 2 The aerobic stage during aerobic anaerobic treatment, part 0.2 0.5 13 6 8 12 Resistivity filtering compacted draft, U cm / g35 20 19 21 22 38 124 The duration of the anaerobic stage in the process of aerobic-anaerobic treatment, h 0.2 0.4 0.5 1 3 6, 10 Resistivity. filtering compacted draft, U cm / g 120 21 23 21 24 78 106 Dissolved oxygen concentration, mg 02 / l.h 3-3.5 0.2-0.1 O O 000