SU906359A3 - Process for treating effluent precipitate - Google Patents

Abstract

A process for the utilization of anaerobic digested sewage sludge which comprises: (a) heating the digested sewage sludge to at least 80 DEG C and then optionally cooling it from 80 to 40 DEG C; (b) separating the heat treated digested sewage sludge, optionally in the presence of a coagulant, to give a concentrate and a supernatant; (c) preparing a culture medium by adding to the supernatant a C1-C3 alcohol and a nitrogen-containing inorganic salt and, optionally, one or more water-soluble vitamin precursors or growth factors; (d) inoculating the culture medium with anaerobic digested sewage sludge; (e) anaerobically fermenting the inoculated culture medium at from 26 to 38 DEG C; (f) separating the biomass from the fermentation liquid formed during the fermentation. e

Description

I

The invention relates to methods for treating sewage sludge and may find application in purifying municipal municipal waters and various sewage. - 10) using known substances used in pasteurization, then the precipitate is cooled to 30 ° C and the solid and liquid phases are separated. 1.15

The aim of the invention is to obtain feed biomass.

The goal is achieved by the fact that according to the method, which includes heat treatment, cooling and 20 separation of the precipitate from the filtrate, heat treatment is carried out at 100-150 ° C, o.ch. bio-substance and 25

fermented at 2b-38 ° C, the biomass is separated and dried.

Preferably, ammonium acid carbonate and / or ammonium acid phosphate and / or ammonium nitrate are used as the nitrogen-containing inorganic salt.

Either pimelic or nicotinic acid is used as bio-substance.

The product obtained as a result of processing is rich in vitamins and proteins, it can be used as feed. The content of crude protein in a product is 50 wt.%, The total content of water-soluble vitamins is 1000 g / h.

The method is carried out as follows.

Claims (2)

The sludge from the sludge collector (t 30-35 ° C, pH 7-8, anaerobic conditions) is fed to the storage tank and then to the heat exchanger. The storage tank is approximately 10 times the daily discharge of raw sludge. Before the introduction of a raw sludge, the same quantity of rotted sludge is taken from the sludge collector. The sludge is heated in a heat exchanger to 100-150 ° C, and then cooled to 40-80 ° C and transferred to a septic tank. During heating, pathogenic bacteria are destroyed. In addition, the nutrient solution (supernatant) becomes more beneficial for further processing. A coagulant, such as inorganic or organic electrolytes, natural glue, and starch, is added to the settling tank. However, the stopping process can be carried out without coagulant. From the bottom of the settling tank, the slits are taken away, from the top - nutrient solution “30-50 of the sludge contains 1218% of dry matter, 50-70% of the volume of the nutrient solution — 0.5-1% DL The slurry is centrifuged and a concentrate of 30-50% by volume additionally nutrient solution. The dry matter content in the concentrate is 30 kO wt.%. The concentrate is dried and / or calcined. In both cases, a product is obtained that is used as an additive to livestock feed. Supernzant is injected into nutrient solution, inorganic metal salt, methanol, bio-substance is introduced and fermented. The presence of methanol in the supernatant prevents the multiplication of pathogenic bacteria. From the fermenter, liquid is fed to a separator, where biomass is separated, in an amount of 10–20% by volume, which is then dried. Biomass contains about 70% of crude protein and a significant amount of water-soluble vitamins. As a result of drying, the biomass is conserved and acquires a condition suitable for packaging and transportation. Example. 30 m of raw sludge are daily fed to a tank with a volume of 300 m, which is subjected to anaerobic treatment at 80-85 ° С, pH 7-8. 30 m of rotted sludge are taken every day and fed to heat treatment for 15 minutes at 100 ° C, then cooled to 60 ° C. After that, the sludge is fed to a sump, where 60 K of A22 (504) h, dissolved in 300 l of water, is introduced. Deposition was carried out k hours. After decantation, 18 m of the supernatant nutrient solution and 12 m of concentrate were obtained. The concentrate is rifled and 5 m of concentrate are obtained with 35 wt.% Solid content 9 dry matter (dry matter 1.9 tons) and 6.58 m supernatant with 1.58 wt.% Dissolved solids content (dry matter 0, 1 t). Both nutrient solutions are fed to a container with a volume of 50. In the end, 2k, 6 m of supernatant is obtained with a content of 0.85 wt.% Of dissolved solids (dry matter 0.2 tons) and 5.2 m of concentrate with a solids solids content of 35 wt. dry matter 1.9 t), the latter is dried with and thus 1.77 tons of product with a water content of 10% is obtained. The composition of this substance: total organic matter content is 59%, including crude protein 18%, ash containing metal oxides, 1%, acid soluble cations,%: Fet 2.1 4, Zu 0.25, Mn 0 , 36, Mgl 0.3,, 1, Cb 8.2., 800 l of methanol, 36 kg of ammonium hydrogen carbonate, diammonium carbonate, 12 kg of glycine, 12 kg of molasses, 0.6 kg of chloride are introduced into the supernatant magnesium, 2 kg of brewer's yeast, dissolved in 5, m of water. The mixture is fed into the fermenter, where it is maintained at 8 hours with stirring. After fermentation, the biomass is separated. From 30 m of fermentation liquid, 2.28 m of biomass is obtained with a dry matter content of 30% by weight (dry matter content is 670 kg) and 27.7 m of nutrient solution (supernatant) with a dissolved solids content of 0.3 weightD (dry matter content is 8Q kg). The supernatant is fed to biological treatment facilities. The amount of biomass after the dryer is 627 kg. In terms of dry matter, the composition is as follows: crude protein 6E%, vitamins B, BQ, 85,. nicotinic acid, pantothenic acid. Instead of ammonium hydrogen carbonate, it is possible to introduce ammonium acid phosphate and / or ammonium nitrate. Pimelic or nicotinic acid can be used as biobios. In this case, the biomass has the following composition: (quantity 7b5 kg) crude protein (k%, vitamins B, B2, Bjj, B,., Nicotinic acid, choline chloride, biotin, pantothenic acid. Formula of the invention 1. Wastewater treatment method including heat treatment. 5 9063596 cooling, followed by separation, containing inorganic salts and extracts from the filtrate, is distinguished by using ammonium hydrogen carbonate u and with the fact that, in order to obtain and / or acidic ammonium phosphate and / or. no feed biomass, heat treatment ammonium nitrate. ku is carried out at lOO-ISO C, cooling-s 3. Method about PP. 1 and 2, about t l and at 80-4 ° C, and in the filtrate it is introduced with the fact that either pimek salt, bio-substance and fermenting linear or nicotinic acid are used as methanol, nitrogen-containing nergene-bio-substance at a temperature of 26-38 С followed by-Sources of information, biomass.to taken into account during the examination, 2. The method according to p. 1, distinguish -1. Germany application number 2317673, “) And with the fact that as nitrogen-cl. 85 C 6/09, 197.