DE2238621A1 - METHOD OF PURIFICATION OF WASTE WATER - Google Patents

Description

P / G 2661 January 28th-1972

Applicant;

J. Conrad Steiagelin
72 Tuttliragen
Upper suburb 21

Process for the clarification of waste water

The invention relates to ®isa Verfalhffesa raar clarification of wastewater in a Klärasalag® ·, preferably with a mechanical transfiguration, eisaeoa multilevel biological Part and a mechanical one! HaeMüLärun.g «»

In the biological purification stage of an eolel & em sewage treatment plant the organic pollution contained in the wastewater is broken down, i.e. in microorganisms or in nutrient eels There are converted - for procedural reasons conditional - only three biological cleaning processes, namely those with trickling filter systems, immersed trickling filter systems or with sludge activation systems.

40980 7/0658

BATH

- 2 ■ - P / G 2661

Stalkin

When treating heavily organically polluted wastewater with extensive purification, it is advantageous to use the To treat wastewater gradually in two or more biological stages with or without intermediate clarification. The biological levels are separated from each other by weirs. The biological purification stages often sit down from two different biological cleaning processes, e.g .:

first biological stage: immersion trickling filter,

Decomposition from e.g. 2000 mg / 1 BOD to 300 mg / 1 BOD.

second biological stage: sludge activation,

Degradation of 3 20 mg / 1 BOD

Degradation of 300 mg / 1 BOD. on

In this two-stage biological clarification stage, between the first stage and the second stage a settling basin serving for coarse desludging is arranged. The use of a sedimentation basin after the first biological stage has the advantage that the second biological stage no longer corresponds to that produced in the first biological stage Mud is polluted.

Investigations on multi-stage experimental plants with or without an intermediate clarifier have shown that the biological degradation the pollutants, which are still contained in the wastewater after leaving the first cleaning stage, only takes place relatively slowly in the second cleaning stage. This relative Slow degradation in the second purification stage is due in particular to the fact that substances were removed from the wastewater in the first purification stage which are necessary for rapid biological degradation of the wastewater that is still present

4098 07/06 5 8 bad original

- 3 - P / G 2661

Stalkin

organic pollutants in the second biological Level missing.

Sewage treatment plants usually consist of the following types of construction:

Primary clarification

biological plant separated into several individual levels arranged from one another are broken down can be. Example: immersion drip head. There can also be a Be connected intermediate clarifier.

After clarification Slimming treatment.

In these systems, all of the wastewater to be treated flows through the primary treatment, biological treatment and secondary treatment.

This delay or loss of biodegradation To hinder in the second biological stage or in subsequent biological stages is the task of Invention.

This object is achieved by the invention in that part of the incoming raw water or part of the out wastewater coming to the primary treatment is branched off and bypassing the first biological treatment stage and, if necessary further, also biological cleaning stages of the second biological cleaning stage or one or more is fed to the further biological purification stages.

At. the present invention is therefore the wastewater the primary clarification. A small part of the mechanical

409807/0658 ~ ⁴ ~

BATH ORIGINAL

- k - P / G 2661

Stalkin

Purified wastewater is added to the biologically partially purified wastewater after the first biological stage (in the second, third, fourth, etc. biological stage) (Fig.l). When using an intermediate clarification between two biological stages, a small part of the mechanically cleaned wastewater from the primary clarification process is added to the inlet to the second biological stage in the runoff from the intermediate clarifier (Fig. 2) that approx. 80 - 95 S flow directly through the biological system and the secondary clarification. 5 % to 20 % of the wastewater is distributed to the other existing biological stages. These stages are now fed with a mixture of biologically partially cleaned wastewater from the first biological stage (approx. 80 - 95%) and mechanically cleaned wastewater from the primary treatment (5 - 20 S).

The addition of the small amount of mechanically cleaned wastewater or, in other cases, raw wastewater in the absence of primary treatment, causes the degradation in the second, third, etc. biological stage to proceed at the same rate as in the first biological stage, which only occurs with mechanically cleaned wastewater or raw wastewater is charged. The nutrients removed from the mechanically cleaned wastewater or raw wastewater in the first biological stage, which hinder or slow down biological degradation in the second, third, etc. stage, are replaced by adding 5 - 20% of mechanically cleaned wastewater or raw wastewater.

The addition of 5 - 20 % of the mechanically treated wastewater or the raw wastewater into the second, third, fourth uο β.w. The biological stage can take place continuously over 24 h / d, ie these stages are fed with a constant amount of waste water.

BATH 409807/0658

- 5 - P / G 2661

Stalkin

It is also possible to control the metering in the same way as the incoming raw sewage volume. The amount of raw water is continuously, ZoB. with a venturi channel. About this water quantity measurement are now also Brosse! Pipelines for the supply of mechanically treated wastewater odeF Rofeabwasser in the second, third, -vierte u _o © _o w _o Level controlled ^ so that this stage proportiosaal the sirfliQßeadei & D © Iha1b> waissermenge charged are can ₀ The Zsadosienitig isa «ä ± ® second, third, fourth UoSoW. biological stage outside via pumps or pumping stations «. It is also necessary, usad In some cases, the second ©, - third ,, -ifierfe n _o s _o w ". To feed stage with different amount »v © m HsecSiaaiscfe gsreiaigtciiB" sewage or raw sewage, delta ,; that di @ swite receive third, fourth UoS.w "biologically © © Stuf® aiclit di same. Amount of waste water.

The invention is further illustrated by 3ar of ± n "Zaichnung embodiments of £ cent, <i @ m Beeeüireibuag which also Einzelheitera of erfindungsgeaäßon process entnonuen werdoa könaen _o Ea is gas * ·.

Fig. 1 is a four-stage Reinigungeanlage ISIT miner. biological cleaning,

2 shows a cleaning system with a two-stage biological cleaning, with an intermediate clarifier between the first and the second stage is switched on.

In the cleaning system shown in Fig. 1, the graining raw sewage is fed through a channel 1 to a primary clarification tank 2 o After the mechanical primary treatment in this tank, about 80-95 Ji of the mechanically pre-treated sewage is discharged through a channel 3 of the first stage 4

409807/0658

BATH ORIGINAL

- 6 - P / G 2661

Stalkin

Immersion drip fed to existing biological cleaning. A circulation line 5 takes about 20 - 5 Jt of the mechanically pre-clarified wastewater and divides the amount of wastewater through branch lines 6, 7 and 8 equally or differently of the second stage 9 _{t of} the third stage 11 or the fourth stage 12 of the other immersed drip heads beateben · the biological cleaning. The individual stages of the biological cleaning are separated from one another by weirs 13. This arrangement prevents the biological degradation in the second, third or fourth biological stage 9t H or 12 from being delayed or silting up of these stages.

From the biological part of the cleaning plant with stages k 1 91 11 and 12, the now also biologically clarified wastewater is led through a channel ik a secondary clarifier 15 ″ ″. From this the cleaned waste water is discharged through a channel 16. The still activated surplus sludge can be fed from the secondary clarifier 15 through a line 17 to the primary clarifier 2 or through a line 18 branched through lines 191 21 and 22 to the second, third or fourth biological stage 9t 11 or 12 «

In the cleaning system shown in FIG. 2, the incoming raw waste water is also fed through a channel 1 to a primary clarification tank 2. After the mechanical pre-treatment in this basin, about 80-95% of the mechanically pre-treated wastewater is fed to a two-stage biological treatment through a channel 3 of the first stage 4 of the immersion drip heads. A recirculation to line 5 "i — t here also takes up about 20-5 % of the mechanically pre-treated wastewater and conveys this amount of wastewater to a channel 23, which led into the second stage of the biological treatment

BATH ORIGINAL

409807/0658

22386 ^ 1

- 7 - P / G 2661

Stalkin

This second stage consists of a tank 24 designed as an activated sludge system, from which the clarified wastewater is fed through the channel 25 to a secondary clarifier 15, from which the completely clarified water is discharged through the channel l6 .. The first stage k incoming wastewater is fed to an intermediate clarifier 27 via the channel 26. The intermediate clarifier 27 is also connected to the basin 2h by the channel 23.

Both from the intermediate clarifier 27 and from the secondary clarifier 15 each leads a branch line 28, 29 to one Bus 31 | through which the excess flows into channel 1 and can thus be fed back to the primary treatment »

-8th-

409807 / Q658

BATH ORIGINAL

Claims (1)

- 8 - P / G 2661 Stalkin Expectations .JProcess for the treatment of wastewater in a sewage treatment plant preferably with a mechanical primary clarification, a multi-stage biological part and a mechanical part After clarification, characterized in that part of the incoming Raw sewage or part of the sewage from the primary treatment can be diverted and bypassing the first biological purification stage and possibly further, also biological purification stages of the second biological Purification stage or one or more of the further biological purification stages is fed. 2. A method for clarifying waste water according to claim 1, characterized in that at least between the first and the second biological cleaning stage in each case before the supply of the raw water or the supply of the an intermediate clarification tank is provided for the preliminary treatment of the wastewater coming. 3ο method according to claim 1 or 2, characterized in that that the successive biological purification stages are based on different purification processes (Trickling filter method, immersed trickling filter method, Schlai activation process). 409807/0658 BATH ORIGINAL - 9 - P / G 2661 Stalkin 4. The method according to claims 1-3, characterized in that the diverted part of the raw water or of the water coming from the primary treatment amounts to a constant 5 to 20% of the total amount of raw water. 5. The method according to claims 1-3, characterized in that the branched off part of the raw water or from the Pre-treatment of incoming water in proportion to the amount of raw water inflow, preferably through a Venturi channel measuring the amount of raw water controlled throttle slide is controlled. 6. The method according to one or more of claims 1-5 * characterized in that the individual biological cleaning stages following the first biological cleaning stage different amounts of raw water or water coming from the pre-treatment can be supplied. pt ec- se »d A aee 6 changed according to input • Received on 409807/0658 BATH ORIGINAL Yo Blank page