SU1386582A1 - Method of purifying waste waters of animal origin of suspended particles with production of organomineral fertilizer - Google Patents

Abstract

The invention relates to methods for treating wastewater with the production of organic mineral fertilizer and can be used for treating wastewater from the food and leather industry, as well as wastewater from livestock breeding complexes. The aim of the invention is to increase the degree of purification and improve the quality of the fertilizer produced. A method has been proposed for purifying animal wastewater from suspended particles with obtaining organic mineral fertilizer, according to which phosphogypsum in an amount of 10-12 g / l of waste is introduced into wastewater, then freshly prepared amorphous calcium hydroxyphosphate in an amount of 0.8- 1.2 mg / l drains, mix and stand. 2 h. the item f., 2 tab. SS (L

Description

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The invention relates to methods for treating wastewater with the production of an organic fertilizer and can be used for treating wastewater from the leather and food industry, as well as wastewater from livestock farms.

The purpose of the invention is to increase the degree of wastewater treatment and improve the quality of the fertilizer produced.

Example. In the wastewater of the animal-breeding complex with the amount of suspended weights, 3,400 mg / l and pH 6.8, phosphogypsum is introduced in an amount of 10-12 g per 1 l of effluent, and then freshly prepared amorphus

Calcium hydroxyphosphate with a density of 1.05 G / CM in an amount of 0.8-1.2 ml per 1 liter of effluent is mixed and settled.

Amorphous, freshly prepared — unsuccessful to crystallize — calcium hydroxyphosphate is a stimulator of the decomposition of phosphogypsum to form coagulant-amorphous calcium hydroxide. Coagulation and precipitation occur, and a clarified liquid forms above the precipitate.

Data on the degree of wastewater treatment and the quality of the fertilizer obtained, depending on the phases of the reagents introduced, are given in Table. one.

. t a 6 l and 1 a 1

As can be seen from the table. 1, the optimal dose of phosphogypsum is 10-12 g / l, while the addition of freshly prepared amorphous calcium hydroxyphosphate with a pH of 1.05 g / cm should be 0.8-1.2 ml. Increasing the dose above 12 g leads to a decrease in pH below the maximum permissible value of 6.5, which limits the use of sludge and the clarified portion of the effluent. Dose reduction reduces the quality of wastewater treatment and fertilizer quality.

Introduction of hydroxyphosphate first, and then phosphogypsum leads to a 9% reduction in the degree of purification.

The results of the comparison of the proposed method with the known - introduction of phosphogypsum alone - are given in table. 2

Table 2

Suspended substances, mg / l (source of water)

3400 360

630

90

380

50

one

: i:

Continuation of table 2 IIIIIZIIIIIIIIIII

0.28 0.28

6.3

0.32 0.3

6.5

Claims (3)

1. A method of treating animal wastewater from suspended particles to produce organic fertilizer, including the introduction of phosphogypsum, mixing and settling, characterized in that, in order to improve the quality of purification and improve the quality of the fertilizer, freshly prepared amorphous calcium hydroxyphosphate is introduced into the effluent. 2. A method according to claim 1, characterized in that phosphogypsum is administered in an amount of 10-12 g per 1 liter of effluent, and calcium hydroxophosphate is 0.8-1.2 mg per 1 liter of effluent. 3. Method according to paragraphs. 1 and 2, characterized in that phosphogypsum is first introduced, followed by calcium hydroxyphosphate.