janvier 1, 2019

The typical large plant, in other words, would kill eleven hundred cattle per day or four thousand hogs per day. It is necessary to see that solid materials are screened or settled out before the wastewater is distributed onto the filter in order to prevent clogging of the filter. The gap between the supply of fish and the demand for fish is widening both in Uganda and globally. Recent attempts to process paunch material into animal feed have met with only partial success. In it was estimated that seventy per cent of all plants recovered blood.

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In many instances hoses equipped with valves have been found to have been altered by plant workers so that the valves remain open all the time. Change subprocess from wet ren- dering with no evaporation of tank water to continuous rendering. Any plant which did not collect blood was automatically listed as « old » technology, regardless of the type of rendering, paunch handling, etc. Poultry Production in the U. Resources in America’s Future. Wet cleanup of plant.

Large plants according to Table 13 use slightly less wastewater per unit than medium-sized plants but more than small plants.

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Washing Washing of the carcass and the internal organs takes place throughout the meat packing process. Future estimates indicate shift in the treatment mixj indicating increased use of methods especially suited for the degradation of meat packing wastewater; that is, wastewater with high concentrations of BOD and high temperatures. Pngpr was chosen because it is one of the most important, commonly used measures of wastewater strength.

To a large extent this is accounted for by the locational shift which has occurred within the industry.

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Therefore, this subprocess is the second highest polluting method of rendering edible materials. Plants of « typical technology » use the most water per unit of product while plants of the « advanced technology » use a slightly smaller amount per unit of product.


Meat Packing plants range in size from plants whose annual kill is less than one million pounds to those plants whose annual kill is over eight hundred million pounds. The reason for this is that processing plants for the most part tend to fall at the lower end of each size group bringing the median down. Meat packing waste is especially suited to anaerobic decomposition because it is a very strong waste and comes from the packing house at a temperature of eighty degrees.

The trend seems to be towards sale of the hog hair because it can be used in the manufacture of foam rubber. There is no discernible pattern relating BOD per thousand pounds of live- weight killed to plant size. Effect of Technology on Wasteloads Technology has been defined in terms of the subprocess mix. Pollution Reduction by Tndustrv Waste Treatment- Table 13 gives the breakdown of the types of treatment being used by poultry processors who have their own waste treat- ment facilities.

When operating efficiently, this process requires retention periods of six to twelve hours. Dry dumping of paunch material followed by off- site disposal 2.

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Two types of plants are considered in this report. II, Chemical Technology Monographs.

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For pungpr reason the median, rather than the mean, was decided upon as the measure of central tendency. Another direct effect of dry cleanup is the reduction of wastewater volume. The pingprr of treatment were based upon the average cost per thousand gallons experienced by plants in our « sample » with occasional adjustments by engineering cost estimates. GHogs average Ibs. The poultry processing industry is different from the meat packing industry in that the former relies primarily upon municipal treatment facilities to reduce wasteloads.


Paunch Material In ruminants cattle, calves, pingpf sheep the paunch or first stomach contains a large amount of undigested material. Because of differing effects upon the waste loading, four subprocesses will be included in this study.

The average charge was then assumed to apply to all processors in the appropriate size group.

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Most of pingprr sample firms had « typical » technology and most of these firms were medium or large in size. A bleeding cycle of longer duration will cause feather removal to be more difficult. The BOD wasteload projections were functions of the total slaughter and the per unit wasteload,which in turn was based upon an assumed distribution of technology.

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This sector of the industry is expected to experience the most growth in as next ten years at the exp- ense of the small sector. Table 6 gives the per cent of plants employing each technology level in as ascertained from the questionnaire data.

In practice, however, it was often found that wastewater use per unit is directly related to wasteload per unit. Pingppr Material Paunch material is troublesome primarily because it pibgpr greatly the total solids concentration in packing plant effluent.

For this reason average figures had to be used many places in the report because of the lack of adequate information. Miscellaneous The United States Department of Agriculture regulations pertaining to the poultry processing industry also affect waste- water volumes. Wastewater It was stated previously that the « technology level » affected in an indirect manner the volume of wastewater effluent.

Very little wastewater comes, for example, from « advanced » technology plants of small size because there are few such plants.