Bibliographical refernces appear at the end of each chapter / This study reviews solid waste management practices in Polokwane City. The study area covered some of the residential areas in Polokwane City; namely; Ivy Park, Fauna Park, Welgelegen, Westernburg and the City Centre. This article describes two main methods that were used to collect data; that is Qualitative and Quantitative method. Field survey was also made to validate data obtained from the participants that were interviewed during qualitative data process. After framing the problem, the objectives of Solid Waste Management Practices in Polokwane City were briefly outlined as follows: • Assess solid waste management practices in Polokwane City. • Make comparison on how households and the municipality take responsibility in storing, collecting, transporting, treating and disposing solid waste. • Investigate what problems the City encounters in managing solid waste. • Make relevant recommendations aimed at improving solid waste management practices within the City. The service management was administered by the municipality and private sector. From the five study residential areas, the Municipality manages waste in the City Centre while the private sector manages waste in the other residential areas. However, the City continues to play an administrative role over the contracted service provider. Statistical results were presented in figures and tables. The results showed the storage habits, frequency of collection, mode of transport and methods of disposal for solid waste in Polokwane City. The only method of disposal in the city was found to be landfilling. Activities that took place at the landfill site, such as reclaiming were outlined together with the economic values that these activities add to the City. The study also revealed that as population increases, the amount of solid waste generated also increased. / Environmental Sciences / M. Sc. (Environmental Management)

Denna avhandling behandlar rökgasutsläpp av persistenta organiska föroreningar, framförallt dioxiner, vid förbränning av fasta biobränslen och torrt hushållsavfall i relativt små anläggningar (5-600 kW) utan avancerad rökgasreningsteknik. Samförbränning av avfall och biobränsle i effektiva mindre biobränslepannor testades som en alternativ strategi till den vanligen förekommande storskaliga hanteringen och förbränningen fast hushållsavfall. Medan storskalig förbränning av avfall ger investeringsmässiga fördelar med rökgasreningsteknik etc. kan små lokala anläggningar ha transportmässiga fördelar och möjligheter till utnyttjande av lokala biobränsletillgångar. Källsorterat, torrt, brännbart hushållsavfall insamlades från hushåll i glesbygd och samförbrändes i brikettform med energigräset rörflen i 150-600 kW biobränslepannor. Endast undantagsvis understeg dioxinemissionerna gällande gränsvärden för avfallsförbränning och nivåerna av väteklorid i rökgas översteg gränsvärdena flerfaldigt. Det bedömdes att någon form av extra rökgasrening är nödvändig för att säkerställa nivågränserna. Dioxiner hittades också i det eldade avfallet, framförallt i textilfraktionen. Dioxinmängderna i rökgaserna var oftast lägre än i det ingående bränslet. Intermittent pelletseldning gav oväntat höga utsläpp av dioxiner med en emissionsfaktor på 28 ng(WHO-TEQ)/kg. Vedeldning i en modern miljömärkt villapanna gav betydligt lägre utsläpp av dioxiner än eldning i en gammal kombipanna och eldning med full lufttillförsel, som kan jämföras med användning av ackumulatortank, resulterade i upp till 90% minskning av utsläpp av dioxiner jämfört med eldning med reducerat lufttillskott (’pyreldning’). Eldning av plastavfall i en vedpanna gav höga utsläpp av dioxiner. Okontrollerad förbränning av trädgårdsavfall och hushålls avfall i tunna eller som öppen eld ’bakgårdsbränning’, gav stora variationer i utsläppsnivåer som bara delvis kunde kopplas till avfallsinnehåll. Resultaten visar att denna typ av förbränning kan vara en betydande källa till dioxiner i miljön, och ett emissionsfaktorintervall på 4-72 ng (WHO-TEQ)/kg föreslås för bedömningar av utsläpp från backgårdsbränning av avfall med låga eller måttliga klorhalter. En sammanfattande slutsats av alla försök är att dioxin utsläpp beror på komplicerade samband mellan bränsleinnehåll och förbränningsbetingelser. Bränslen med mycket höga klorhalter av ger oftast högre utsläpp av dioxiner än bränslen med låga klorhalter medan små skillnader döljs av variationer i förbränningsbetingelser. / This thesis deals with emissions of persistent organic pollutants, primarily dioxins, from the combustion of solid biofuels and dry combustible household waste in relatively small facilities, 5-600 kW, without advanced air pollution controls. Co-combustion of waste and biofuel in effective small boilers was tested as an alternative to prevailing large-scale management and combustion strategies for handling municipal solid waste. This approach includes no advanced air pollution control systems, but offers two advantages: limiting transport and providing scope to use local biofuel resources. Source-sorted, dry, combustible household waste was collected from households in a sparsely populated area and co-combusted as briquettes together with reed canary-grass in 150-600 kW biofuel boilers. Most trials showed difficulties to meet regulative limits for the emissions of dioxins valid for incineration of MSW and the regulated limits for emissions of hydrochloric acid were exceeded manifold. It was concluded that additional flue-gas cleaning will be needed to ensure that emissions are sufficiently low. Dioxins were also found in the waste, especially in the textile fraction. The mass of dioxins in the flue-gas emissions was generally lower than the mass in the fuel input. Intermittent combustion of wood pellets in a residential boiler resulted in an unexpectedly high dioxin emissions factor of 28 ng (WHO-TEQ)/kg fuel. Combustion of wood in a modern environmentally certified boiler yielded considerably lower dioxin emissions than combustion in an old boiler, and combustion with a full air supply, i.e. with use of heat storage tank, resulted in up to 90% reductions in dioxin emission factors compared to combustion with reduced air supply. Combustion of plastic waste in a residential wood boiler resulted in high emissions of dioxins. Tests of uncontrolled combustion of garden and household waste in barrels or open fires, ‘backyard burnings’, resulted in emissions with large variations that could only be partly correlated to the waste constituents. The results imply that this may be an important source of dioxins in the environment and an emission factor range of 4-72 ng (WHO-TEQ)/kg is suggested for estimating emissions from backyard burnings of lightly and moderately chlorine-contaminated waste. A summarized conclusion from all of the experiments is that predicting emission levels from waste contents is not straightforward (except that fuels with very high chlorine levels will usually result in high levels of dioxins in flue-gas emissions). Moderate differences in chlorine levels will usually be masked by the effect of variations in combustion conditions.

Im EU finanzierten Projekt "Die Verwendung von kompostiertem Haushaltsmüll in der vorstädtischen Landwirtschaft von Westafrika als Pflanzenschutzmittel", das in Rufisque im Senegal, Conakry und Timbi Madîna in der Republik Guinea sowie Lomé und Tsévié im Togo von 1999 bis 2002 stattfand, wurden die Daten für diese Arbeit erhoben. Diese Orte sind hauptsächlich von Wolofs, Fulfulbe, Sussus und Ewes bewohnt. Ihre Größe variert zwischen 4 000 und 1,4 Mill. Einwohner. Es wurden städtische Gemüsebau- und vorstädtische Ackerbausysteme untersucht. Ziel der Arbeit ist die Einführung von Kompost als Pflanzenschutzmittel zu erleichtern. Dazu wurden Bereitschaften untersucht: die der städtischen Haushalte Biomüll zu sammeln und die der vorstädtischen Bauern Kompost aus Haushaltsmüll als Pflanzenschutzmittel einzusetzen. Dafür wurden standardisierte Befragungen von 1802 Bauern und 1775 Haushalten durchgeführt. Etwa 10 % dieser Antworten wurden in 18 logistischen Regressionsmodellen mit Interaktionen des 1. Grades analysiert. Den Modellen wurden die qualitativen Ergebnissen aus den standardisierten, halbstandardisierten und unstrukturierten Interviews sowie Beobachtungen und Einzelfallstudien gegenübergestellt. Daraus läßt sich schließen, dass es keine traditionellen Hemmnisse gegen Biomüllsammlung und -verarbeitung, sowie die Verwendung von Kompost aus Müll gibt. Wilde Deponien stören die Einwohner. Sie sind bereit sich finanziell an einer Müllsammlung zu beteiligen. Für die Mülltrennung brauchen sie zusätzliche, an Klima und Menge angepasste Mülltonnen. Die Haushalte wollen geringere Müllgebühren bezahlen, wenn sie Müll trennen. Müllsammen ist rentable. Eine transparente Buchführung der Müllgebühren ist unerlässlich für die Nachhaltigkeit. Für eine Kompoststation eignet sich am besten eine Kleinstadt mit vielen Müllproblemen und noch ohne Müllsammelorganisation sowie mit vielen Gemüsebauern mit einem hohen Krankheitsbewußtsein. Die Kompostherstellung ist sehr arbeitsintensiv und nur rentable, wenn der Kompost zu Pflanzenschutzmittelpreisen verkauft werden kann. Kompost ist in Westafrika bekannt. Die Verwendung von Kompost als Pflanzenschutzmittel gegen bodenbürtige Krankheiten ist eine Neuerung. Daher benötigt eine Kompoststation ein sehr wirksames Marketing. / By the EU financed project called "Utilisation of composted waste from urban households in the peri-urban agriculture for plant protection purpose in West Africa" with took place in Rufisque in Senegal, Conakry and Timbi Madîna in the Republic of Guinea the same as Lomé and Tsévié in Togo from 1999 to 2002, the data which are the base of this study have been collected. These towns are mainly settled by Wolofs, Fulanis, Sussus and Ewes. The size of the towns varies from 4 000 to 1.4 mill inhabitants. Production systems of urban vegetable farmers as well as peri-urban rain fed farmers have been investigated. The objective was to analyse the willingness of household, to collect organic waste, and of farmers, to use composted household waste for plant protection, to facilitate the introduction of compost for phytosanitary purpose. Hence standardised interviews of 1802 farmers and 1775 households have been done. About 10 % of the answers have been standardised in a way which allowed analysing them in 18 models of logistic regression with the first level of interactions. The results of the models have been compared to the qualitative results of the standardised, the half standardised and the unstructured interviews as well as the observations and the case studies. We find out that: There are no traditional obstacles inhibiting the collection of organic waste, the processing and the use of compost. Wild waste heaps disturb the people. They are ready to participate financially on waste collection. For the separation of waste the households need bins adapted to the climate and to the amount of waste. Anyway households separating waste would like to pay reduced waste fees. The waste collection is actually a rentable economic activity. A conflict avoiding accountability for waste fees is essential for the long lasting of a waste collection organisation. An optimal place for a compost station is a small rural town with many waste problems, without an institutionalised waste collection and with many vegetable farmers aware of diseases. The production of compost is very labour-intensive and rentable only if the compost is sold on organic pesticide prices. Compost is well known in West Africa. The innovation would be the application of compost for pest treatment of soil related diseases. Therefore a compost station needs a very efficient marketing.

Abstracts in English, Sotho and Zulu / Waste generation is a global problem encountered by many nations. In recent years, population growth, booming urbanisation, an increase in economic activities and rise of communities’ living standards have significantly escalated household waste generation which has been a cause for concern. Waste production in households and schools imposes serious concern on the environment. To curb further depletion of environmental resources, sustainable consumption and household waste management practices and systems cannot be over emphasised. Therefore, the aim of the study was to explore the views of secondary school teachers’ views with regard to learners’ awareness of household waste management in Newcastle, South Africa. This study, following a qualitative approach, adopted a case study design to explore secondary teachers’ views on learners’ awareness on household waste management in the Newcastle municipality, in the Amajuba District, South Africa. By using semi- structured interviews, non-participatory observation and documents analysis, data were collected from three secondary schools and nine teachers, teaching Natural Sciences, Social Sciences and Life Orientation in Grade 8. The findings revealed that teachers understand the importance and benefits of household waste management although misconceptions of household waste management still prevailed. A challenge that emerged showed that teachers lack training to successfully integrate household waste management in their subjects. Their failure to identify household waste management themes in their CAPS subjects was sufficient evidence for the urgency of in-service training of teachers to assist them in integrating environmental education (EE) themes such as household waste management in their subjects. Although teachers experienced several challenges regarding implementing the theme of household waste management in their subjects, they considered the benefits outweighed the challenges. / Tlhahiso ya ditshila ke bothata bo aparetseng dinaha tse ngata. Dilemong tsa morao tjena, kgolo ya baahi, ho eketseha ha ditoropo, ho eketseha ha mesebetsi ya moruo, le ho phahama ha maemo a bophelo a baahi ho ekeditse tlhahiso ya ditshila tsa malapa ka mokgwa o bonahalang, e leng seo e leng sesosa sa ho tshwenyeha. Tlhahiso ya ditshila malapeng le dikolong e baka mathata a tebileng tikolohong. Ho thibela ho qepha ho eketsehileng ha mehlodi ya tikoloho, tshebediso e tsitsitseng le ditlwaelo tsa taolo ya ditshila tsa malapeng le ditsamaiso ho hloka ho elwa hloko ka tsela e kgethehileng. Kahoo, sepheo sa phuputso e ne e le ho hlahloba maikutlo a matitjhere a dikolo tse mahareng mabapi le tlhokomediso ya baithuti ka taolo ya ditshila tsa malapa Newcastle, Afrika Borwa. Phuputso, ka ho sebedisa mokgwa wa boleng, e amohetse moralo wa phuputso e ikgethileng ho hlahloba maikutlo a matitjhere a dikolo tse bohareng hodima tlhokomediso ya baithuti mabapi le taolo ya ditshila tsa malapa mmasepaleng wa Newcastle, Seterekeng sa Amajuba, Afrika Borwa. Ka ho sebedisa dipuisano tse hlophisitsweng hantle, tlhahlobo e sa kenyelletseng bonkakarolo le manollo ya ditokomane, datha e ile ya bokellwa ho tswa dikolong tse tharo tse bohareng le ho matitjhere a robong, a rutang Saense ya Tlhaho, Saense ya Phedisano le Thuto ya Bophelo bakeng sa baithuti ba Sehlopha sa 8. Diphetho di senotse hore matitjhere a utlwisisa bohlokwa le melemo ya taolo ya ditshila tsa malapa le hoja maikutlo a fosahetseng mabapi le taolo ya ditshila tsa malapa a ntse a atile. Phephetso e ileng ya hlaha e bontsha hore matitjhere a haellwa ke kwetliso ya ho kenyelletsa ka katleho taolo ya ditshila tsa malapa dithutong tsa bona. Ho hloleha ho kgetholla dihlooho tsa taolo ya ditshila tsa malapa dithutong tsa bona tsa CAPS e ne e le bopaki bo lekaneng ba ho potlaka ha kwetliso ya matitjhere a tshebetsong ho ba thusa ho kenyelletsa dihlooho tsa thuto ya tikoloho (EE) jwalo ka taolo ya ditshila tsa malapa dithutong tsa bona. Leha ele hore matitjhere a ile a ba le diphephetso mabapi le ho kenyelletsa dihlooho tsa taolo ya ditshila tsa malapa dithutong tsa bona, ba ile ba utlwa hore melemo e feta diphephetso. / Ukukhiqizeka kukadoti kuyinkinga ehlangabezana nezizwe eziningi emhlabeni. Eminyakeni esanda kudlula, ukukhula kwenani labantu, ukukhula kwamadolobha, ukukhula kwemisebenzi yamabhizinisi kanye nokukhuphuka kwezinga lempilo yabantu yikho okuye kwadala ukuthi imizi ikhiqize izinga eliphezulu likadoti/lenkukuma, okuyinkinga ebekade ivele isikhona. Ukukhiqizeka kukadoti emakhaya kanye nasezikoleni kudala izinkinga ezibi kakhulu endaweni. Ukuqeda ukumoshakala/ukuguga kwemithombo yezendawo okuqhubekela phambili, kusobala ukuthi kudingeka izindlela ezisimelele zokugaywa kukadothi kanye nezindlela zokulawula kukadothi kanti konke lokhu kuyiqiniso elingenakuphikiswa. Ngakho-ke, inhloso yocwaningo kwakuwukuphenya imibono yabafundisi bezikole zamabanga aphakeme mayelana nokuxwayisa uhlelo lokulawulwa kukadoti endaweni yase Newcastle, eNingizimu Afrika. Lolu cwaningo ngokulandela indlela yocwaningo eyencike kwingxoxo, luye lwalandela idizayini yocwaningo lotho ukuphenya imibono yabafundisi bamabanga aphakeme mayelana nokuxwayiswa kwabafundi ngokulawulwa kukadoti emakhaya ngaphansi kukamasipaladi waseNewcastle, ongaphansi kwesiFunda saseMajuba, eNingizimu Afrika. Idatha iye yaqoqwa ngokusebenzisa inhlolovo embaxambili, kwahlaziywa indlela yokuziphatha futhi kwahlaziywa imibhalo, kanti le datha iqoqwe ezikoleni zamabanga aphakeme ezintathu kanye nakubafundisi abayisishiyagalolunye, okungabafundisi abafundisa izifundo phecelezi Natural Sciences, Social Sciences kanye neLife Orientation yabafundi bakaGreyidi 8. Ulwazi olutholakele luveze ukuthi abafundisi bazwisisa ukubaluleka kanye nezinzuzo zohlelo lokulawulwa kukadoti, yize kusekhona ukudideka/ukungazwisisani mayelana nohlelo lokulawula ukuphatha kukadoti. Inselelo ebonakele, ikhombise ukuthi abafundisi baswela ukuqeqeshwa ukuze bakwazi ukuzwisisa kahle uhlelo lokulawulwa kukadoti kwizifundo zabo. Ukwehluleka kwabo ukwehlukanisa izindikimba zokulawulwa kukadoti emakhaya ezifundweni zabo zeCAPS kuye kwaba wubufakazi obanele besidingo esisheshayo sokuqeqeshwa kwabafundisi abasemsebenzini ukubanceda ukuba bakwazi ukuhlanganisa izindikimba zezifundo zezendawo environmental education (EE) ezinjengokulawulwa kukadoti ezifundweni zabo.Yize abafundisi behlangabezana nezinselele ezimbalwa mayelana nokusebenzisa indikimba yokulawulwa kukadoti ezifundweni zabo, baye babona ukuthi izinzuzo zalokhu zedlula izinselele. / Curriculum and Instructional Studies / M. Ed. (Environmental Education Curriculum)