Hexa-Cover R114 covering system for manure tanks with pig slurry Reduction of Ammonia and Odour Emission

Overview A test mark „DLG-APPROVED for individual criteria“ is awarded for agricultural products which have successfully fulfilled a scope-reduced usability testing conducted by DLG according to independent and recognised evaluation criteria. The test is intended to highlight particular innovations and key criteria of the test object. The test may contain criteria from the DLG test scope for overall tests, or focus on other value-determining characteristics and properties of the test subject. The minimum requirements, test conditions and procedures as well as the evaluation bases of the test...

The covering system from the company Hexa-Cover A/S consists of individual buoyant elements to be applied as a floating cover for open manure tanks, mainly for pig manure or degassed manure. This forms a floating layer, with the flotation bodies arranged closely on the surface of the manure.The individual elements are applied to the surface of the manure using mobile technology and then largely arrange themselves in a form-fitting manner. The examination was carried out on two agricultural farms with pig manure and degassed manure. Under test conditions, a reduction level of ammonia of 98 % could...

The basis of the evaluation by the DLG Technical Committee (TC) are the measurements from the year 2004. The TC acknowledges the quality of the measurements at that time. The deviations from the current DLG test framework are tolerated and accepted as acceptable. The changes made to the product in the meantime (reduced product height as well as lower weight) are not expected by the TC to result in any relevant change in effect. The test included measuring of the emission reduction of odour and ammonia under laboratory conditions. The examinations (see test conditions Table 3) were carried out...

The test was carried out at two agricultural farms. The test results are based on comparison between containers covered by Hexa-Cover system and uncovered containers, filled with identical pig manure. The results are summarized below. Measuring results of the odour concentration Ventilation (m3/h) uncovered Hexa-Cover Efficiency (%) The odorant concentrations generated by the uncovered manure ranged from 372 to 10,378 OU/m3, depending on temperature and ventilation. With the Hexa-Cover cover system, the measured concentrations ranged from 70 to 803 OU/m3. This results in a reduction degree of...

Ammonia The measurement of ammonia emissions showed, with a covering of 98 % of the surface, an emission reduction of 96 to 99 % for pig manure I and II (manure from piglet rearing, pH value adjusted/degassed from biogas plant). Based on a container diameter of 30 m with a resulting coverage rate of 98 %, an average reduction rate of 98 % can therefore be stated. Relationship between coverage level and ammonia emission The coverage level achievable with the Hexa-Cover covering system depends on the diameter of the manure tank. In Figure 3, the relationship between coverage rate and ammonia reduction...

Summary The examination included technical measurements for reducing odour and ammonia emissions from pig manure under laboratory conditions. The covering system was not tested in practical use. Based on the present results, the Hexa-Cover covering system meets the requirements for the award of the test mark DLG APPROVED with regard to the test criteria “Ammonia and odour emission reduction”. Other criteria were not investigated.

Further information Testing agency DLG TestService GmbH, Groß-Umstadt location, Germany Farm Inputs Division Head The tests are conducted on behalf of DLG e.V. Labor and emissions measurements Test engineer(s) Odour: ECOMA GmbH, Consult Mannebeck, Harvighorster Weg 12, 24211 Honigsee, Germany Dipl-Ing (FH) Tommy Pfeifer * Technical Committee Ammonia: LugtTec A/S, Niels Pedersen Alle 2, 8830 Tjele, Denmark Dr. Gunnar Brehme, Wiesenhof Frank Geburek, District Coesfeld Dr David Janke, ATP Potsdam Alfons Krafeld, LWK NRW Prof. Dr. Jörg Oldenburg, Engineering office DLG test framework DLG APPROVED...