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(1)

30

-ioo

kg growing pigs

and

gestating-lactating

sows. It results in a linear increase of

DBO 5 ,

in relation to

liveweight

of

growing pigs,

whereas

pollution (on liveweight basis)

is enhanced for

piglet

and lowered for sows.

Food

composition

has a small influence

except

when fat

(DBO, increased),

fibre

(DCO increased),

N

(NH, increased)

are added.

Management factors, including bedding

with straw and

washing

of pens, have a wide influence

on

volume, dry

matter and

composition

of

solid/liquid

wastes.

PRÉ-TRAITEMENT

DES LISIERS DE

PORCS

AVANT

ÉPURATION BIOLOGIQUE

A. HAUBRY Société

Degremont,

B. P.

46,

92 Suresnes

RÉSUMÉ

L’étude rassemble les

principaux

résultats obtenus par

tamisage

sur

vibro-séparateur

et par

centrifugation

avec ou sans conditionnement au moyen de décanteuses continues.

Nous

analysons

essentiellement les rendements d’élimination en matières

sèches,

DCO et

DBO,

et comparons les extractions de lisiers frais et lisiers

âgés.

Le

problème

de la

déshydratation

des boues en excès

provenant

de

l’épuration biologique

de

lisiers est

également

abordé.

SUMMARY

SWINE WASTES PRETREATMENT

(BEFORE

BIOLOGICAL

TREATMENT)

This paper

gives

the main results obtained

by sifting

on

vibrating separator

and

by

centri-

fugation

with or without

conditioning, by

means of continuous decanters.

We

mainly analyse

elimination rates of

dry solids,

COD and

BOD.,

and we compare the extractions of fresh and

aged

swine wastes.

We also examine the

dehydration

of activated excess

sludge resulting

from

biological

treat-

ment.

Références

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