SU1468869A1 - Method of biologic treatment of waste water - Google Patents

Abstract

The invention relates to the field of biological treatment of domestic and industrial wastewater, in particular using attached and free-floating microflora. The aim of the invention is to save; the degree of purification in terms of changes in wastewater flow. The method of biological wastewater treatment includes preliminary mechanical treatment with the use of large inclusions in the lattice, mineral suspensions by a sand trap and primary settling in a settling tank, subsequent treatment of the waste liquid using a bio-oxidant with attached microflora, joint aerocoagulation of the previously cleaned waste liquid and part of the original waste liquid on the bio-oxidant with attached microflora, combined aero-coagulation of the previously cleaned waste liquid and part of the original waste liquid on the bio-oxidant with attached microflora; microflora, gravitational separation of free-floating microfusion in the secondary settling tank, release to the treated wastewater through the discharge pipe, returning the recirculating flow of the free floating microflora is carried out by the main and additional airlifts and mixed in the mixer with the bypass flow coming from the separating tray to collect the excess part of the wastewater flow, joint, the flow goes to aero-coagulation where in oxygen and mixing provide aerating devices. 3 tab. aa oo 00 SU5 o

Description

The invention relates to biological purification of domestic and industrial wastewater, in particular using attached and free flooding, and its microflora.

The aim of the invention is to maintain the degree of purification under the conditions of varying wastewater flow.

The method of biological purification waters includes a preliminary

mechanical cleaning with the use of large inclusions grating, mineral suspensions by sand trap and primary settling in a settling tank, subsequent treatment of waste liquid on a bio-oxidant with attached micro-; flora, joint aerocoagulation of previously cleaned waste liquid and part of the original waste liquid on an aero-coagulant;

floating microflora, gravitational separation of free floating microflora in the secondary settling tank, release of treated wastewater through the discharge line, returning the recirculating flow of free floating microflora to the primary and secondary airlifts and in the mixer is mixed with the stream coming from the separating tray to extract the excess portion of the waste liquid , the joint flow enters aerocoagulation, where oxygen demand and mixing are provided by aerating devices .

PRI m e ro Method is carried out in wastewater treatment at real objects. In tab. and 2 presents the indicators of the treatment process and the data comparable with the prototype, where Q is the hourly inflow of wastewater; Lg - MIC wastewater entering the biofilter; BLo-biofilter-accessible load; B is the concentration of suspended solids entering the biofilter; K is the multiplicity of recycling by the mean inflow; A is the concentration of activated sludge; BD - technological load on the aerocoagulant j mgBPK / g ila-h; L. - MIC sewage entering. On aero-coagulant; In | - concentration of suspended substances entering aerocoagulum - Topj L - MIC wastewater after azocoagulant (purified liquid) | In |. - concentration of suspended substances in wastewater after aerocoagulant, mg / l (purified liquid).

As follows from these tables, in terms of fluctuations in the inflow and concentration of contaminations at a multiplicity of recirculation of 155-4.2, the technological load on the free-floating microflora is close to constant - 80–83 mg VPK / g silt.h.

With a decrease in the recycling ratio below 1.5, there is a sharp decrease in the relative Purification Effect, on the other hand, an increase in the recycling margin of more than 4.2 triple leads to a significant increase in the energy intensity of the process. Only in npef

. Q 5

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In cases of changing the reuse rate of 1.5-4, the specified cleaning effect is achieved along with the reduction of energy consumption in the conditions of natural fluctuations of the inflow

Table 3 presents the data on three purification fields, which allow tracing the change in the cleaning effect and energy costs depending on the limits of the change in the recycling ratio.

The process of tertiary treatment with activated sludge of sewage that has undergone biofiltration provides an autonomous mode of operation of the plant without periodic charging with active sludge. The proposed method is practically applicable to both existing and for. newly built sewage treatment plants, it is advisable to use the biofiltration process, and also allows operational process control of the cleaning process under conditions of natural fluctuations of the load.

Claims (1)

Invention Formula The method of biological treatment of wastewater, including mechanical treatment, treatment with bio-oxidants with attached microflora, is a local aerocoagulation of the previously treated wastewater and part of the original waste liquid with free floating microflora, characterized in that - types of changes in wastewater consumption; treatment with bio-oxidants with attached microflora is subjected to the main stream of waste liquid with a constant flow rate close to the minimum, the excess part of the discharge of waste liquid in the amount of 30-100% of the main stream is fed directly to aerocoagulitis, where it is mixed with the previously purified main stream of waste liquid and the recirculation stream free-floating microflora with recirculation rate relative to the main flow 1.5-4. Table 1