SU1139715A1 - Method of dehelminthization of waste water sediments - Google Patents

Abstract

A METHOD FOR DEGHELMINIZING SUCTION WASTE DEPOSITS by machining them, characterized in that 4TOv-C is intended to shorten the processing time and energy consumption, and they are mechanically disintegrated for 3–10 s at 5–10 s / s collision rates of particles. for the period of processing. at

Description

The invention relates to the decontamination of sewage sludge and can be used in the treatment of sediments contaminated with helminth eggs. The known method of deworming sewage sludge by heat treatment at a temperature of not less than more than 30 minutes. The disadvantages of this method are the high duration of the degel mining, large volumes of deworming chambers and high energy consumption for heating the sludge. The closest to that proposed by the technical essence is the method of deworming sewage sludge by mechanical action in the ultrasonic treatment of sludge of helminths infected with eggs. The disinfecting effect reaches. C at certain frequencies and powers of the ultrasonic effect: the frequency is 22-44 kHz, the power is 10-15 W / cm, the processing time is 50-70 s. Wastewater can be treated with wastewater. There is no possibility of processing condensed pasty precipitates with moisture below 80%. and dry sediments dehydrated on vacuum filters, centrifuges, etc., with humidity below 78-80% due to the low propagation efficiency of ultrasonic waves in such environments. The energy consumption for processing 1 m of sediment with 95–96% moisture is about 25–30 kW / h or 0.5–0.6 kW / per 1 kg of dry matter. 23 The disadvantages of this method are longer processing times, high energy costs. , the impossibility of processing dry and pasty sediments, as well as the complexity of the design of the ultrasonic device and. its high cost The purpose of the invention is to reduce the processing time and energy consumption. This goal is achieved by the fact that, according to the method of deworming sewage sludge by mechanical treatment, the latter are disintegrated for 3-10 s at a speed of collision of particles of sludge 100-200 m / s and the number of mechanical effects; riop processing. The method is carried out as follows. Sewage sludge containing helminth eggs (liquid, condensed, dewatered on sludge plots or dehydration apparatus), floors, are fed into the disintegrator treatment chamber, equipped with one of the types of rotors that ensure successively multiple local mechanical effects on the sludge components, causing stress shear and collisions of particles. At the same time, 5–10 consecutive local mechanical impacts per cycle of sludge treatment for 3–10 s and a velocity of collision of particles of sludge 100–200 m / s are provided. Liquid sediments are fed to the disintegrator by a dosing pump, and paste-like and dry-auger feeders. Energy consumption for processing 1 m of sediment with humidity 96% 5-6 kW / h or 0.16 kW / h per 1 kg of dry matter. When processing pasty and dry sediments (humidity 75-80%) energy costs 10 kW / h per 1 m - or 0.05-0.45 kW / h per 1 kg of dry matter. The design of the apparatus allows processing both pasty and dry sediments of any moisture content. Helminth eggs lose viability as a result of mechanical stress and the integrity of the membranes. The treated sediments do not contain viable eggs of helminths, Example 1, Sewage sludge with a moisture content of 96%, containing helminth eggs in an amount per kg of osapka 300 eggs, is fed into the chamber of the disintegrator j equipped with a rotor. When treating the sediment, the number of consecutive local mechanical impacts during one treatment cycle is 5, the particle impact velocity is 100 m / s, and the treatment time is 3 s. At the same time, the treated sludge does not contain viable eggs of helminths. PRI me R 2, Sewage sludge with a moisture content of 80%, containing helminth eggs in the amount of 2000 pieces per 1 kg of sediment, is fed to the disintegrator chamber equipped with a rotor. When treating sludge, the number of consecutive local mechanical effects for one-cycle treatment 7, sko311

particle impact velocity 150 m / s, treatment time 5 s. The treated sediment does not contain viable helminth eggs.

PRI me R 3. The sewage sludge with a moisture content of 50%, containing helminth eggs in the amount of 5,000 pieces per 1 kg of sludge, is fed into the disintegrator chamber equipped with a rotor. During sludge treatment, the number of consecutive local mechanical impacts per treatment cycle is 10, the particle impact velocity is 200 m / s and the treatment time is 10 s. In this case, the treated sediment does not contain viable eggs of helminths.

The experimental results obtained indicate that when the sludge treatment time in the disintegrator is less than 3 s, when the particle impact velocity is less than 100 m / s and the number of consecutive local mechanical effects less than 5, complete deworming of the sediment is not achieved. An increase in the processing time of precipitates by more than 10 s, the velocity of collision of particles more than 200 m / s, and the number of local mechanical forces following one after another,

action more than 10 is impractical because it leads to a sharp increase in energy consumption without improving the degree of deworming.

Comparative data indicating the advantages of the proposed method in comparison with the known, are shown in the table.

As follows from the data presented in the table, the implementation of the process of deworming sewage sludge according to the proposed method makes it possible to shorten the process time by 7-17 times and energy costs by 3-4 times, and also allows processing paste-like and dehydrated sediments of any humidity. In addition, the application of the proposed method allows to significantly simplify the design of the equipment used and reduce its cost.

Due to the reduction of energy consumption and cost of equipment, the application of the proposed method yields an economic effect as compared to the base order of 24.15 thousand rubles. per year on the reduced costs of wastewater treatment plants 100 thousand.

The specific energy consumption per 1 kg of the treated sludge is 96% moisture. kWh

Specific energy consumption for processing 1 kg of dewatered sludge with a humidity of 80%, kW / h

Processing time, with

Equipment cost (with a device capacity of 200 m / h thou. Rubles

Ability to process pasty and dehydrated sludge

0.15-1.16

0.05-0.045 3-10

10-15 Possible

Claims (1)

METHOD FOR DEGELMINTIZATION OF SEDIMENTS OF SEWAGE WATER by mechanical treatment, characterized in that for the purpose of reducing the processing time and energy consumption, the mechanical treatment is carried out by disintegration for 3-10 s at a speed of collision of sediment particles of 100-200 m / s in the amount of mechanical stress 5 -10 per processing period. Tnwn ⁿⁿ tiS 1139715 2