Testing VTI-M pilot high-rate lamella clarifier with microsand

Summary

In order to test and adjust in pilot mode the technology of enhanced water coagulation a VTI-M pilot high-rate clarifier with microsand was designed. The installation with a capacity of up to 30 m³/h is designed for the purification of surface, storm and waste water. It is constructed in such a way that the purification process can be carried out either with recycling of generated sludge or with the use of fine-grained sandy weighting material. VTI-M clarifier provides for the sustainable water quality that fully meets the requirements to the quality of water supplied to ion exchange desalination.

Key words

coagulation , coagulant , flocculant , microsand , clarifier , enhanced treatment , sand recycling , thin-layer block

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UDC 628.316.12

Iavtushenko Marina, Larionov S. Iu., Panteleev Aleksei, Riabchikov Boris, Shilov Mikhail, Kasatochkin A. S., Zhadan A. V.

Testing IKO-R enhanced coagulation pilot plant

Summary

An experimental plant with a capacity up to 20 m3/h was developed for enhanced coagulation of surface and waste water as well as storm water. The treatment process is based on sedimentation of inclusions together with coagulated flocs under the optimal conditions of chemical addition and mixing. To enhance the sedimentation process sludge recycling from the settling tank was provided that ensured the formation of big flocs. Pilot tests of the plant were carried out to evaluate the efficiency of removing suspended solids and phosphorus from the effluent during tertiary treatment at the Podolsk wastewater treatment facilities in the Moscow Area. The capacity of the plant during testing varied from 3 to 15 m³/h. At steady operation of the settling tank no sludge washout was observed. During longer tests the capacity was 8–10 m³/h; in terms of the cross section of the settling tank the specific capacity (flow rate) was 5–7 m³/(m²·h). Time to reach the steady state conditions was 5–10 minutes. At that the efficiency of phosphorus removal was 80%, permanganate value was reduced by 54% and suspended solids concentration was reduced by 58%.

Key words

coagulation , coagulant , flocculant , sludge recirculation , enhanced treatment , pilot plant

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UDC 628.32

Larionov S. Iu., Panteleev Aleksei, Riabchikov Boris, Shilov Mikhail, Kasatochkin A. S., Zhadan A. V., Savochkin Andrei

Commercial tests of VTI-M high-rate horizontal clarifier enhanced with microsand

Summary

For the adjustment of enhanced coagulation technology on industrial scale a commercial VTI-M plant has been designed for the purification of surface and waste water as well as storm run-off. The design capacity of the plant is up to 300 m³/h. Enhancing the impurity sedimentation process is achieved using fine-grained sand weighting agent. Its subsequent washing off of the sludge is carried out in a pulse column which provides for reducing significantly the amount of secondary waste compared to the known analogues. The development of a new horizontal type clarifier was carried out on the basis of previous laboratory, pilot and experimental-industrial studies. VTI-M commercial clarifier consistently provides for the high quality clarified water that fully meets the requirements for the composition and quality of water supplied for ion-exchange desalination. During the testing period water was supplied for production needs. The use of the equipment package allows obtaining high quality water while reducing the consumption of acids and alkalis which in turn will reduce the discharge of salt waste and thereby reduce the harmful impact on the environment.

Key words

coagulation , coagulant , flocculant , microsand , enhanced treatment , sand recycling , water , commercial plant

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UDC 628.16.066.1:628.164-92
DOI 10.35776/VST.2023.08.01

Bobinkin V. V., Vukolov Oleg, Gizzatullin Artur, Kasatochkin A. S., Kostylev Evgenii, Larionov S. Iu., Oliunin Sergei, Panteleev Aleksei, Riabchikov Boris, Savochkin Andrei, Shilov Mikhail

Industrial horizontal intensified clarifier for water
softening/decarbonization by liming

Summary

Chemical softening methods have been widely used in the water treatment practice. As shown in the previous review, the chemistry of the process has remained unchanged over the past 100 years; however, the instrumentation of the process has changed. This equates to significantly increase the capacity and efficiency of the devices. Research work has been carried out on designing domestic intensified apparatus for softening/decarbonization of water by liming; and their introduction into industrial practice has started. Studies of the developed version of the multi-chamber horizontal clarifier with liming of Aquafloc type were carried out. The boundary parameters of the process of water liming with coagulation with iron salts were determined. It was established that the improved mixing, acceleration of chemical reactions and recirculation of carbonate sludge (seed) provide for the optimization of the sedimentation process to reduce the coagulant consumption and significantly improve the sludge characteristics. Essential advantages of the clarifier are as follows: smaller dimensions and metal consumption compared to classical clarifiers, as well as a short time to reach the operating mode. Thereby, an Aquafloc clarifier can be delivered to the site ready assembled, ready-to-use and with anti-corrosion protection that significantly reduces the time and cost of assembling at the facility. The concentration of dry matter in sludge reaches 8%. In comparison with the existing VTI-630 clarifiers, Aquafloc clarifier showed similar results in terms of chemical parameters and the best in terms of the concentration of suspended solids. In terms of water consumption for own needs, the clarifier turned out to be at the level of VTI apparatus that have a total blowdown volume of 2–4%.

Key words

coagulation , suspended layer , hardness , enhanced treatment , water , mixing , chemical water softening , liming , horizontal clarifier