It may be that biowaste composting increase the absorption or enhance or increase the binding of pesticides to the soil, thus the plant will absorb it and this will lead to more residues levels in the products.

Pesticides are different in formulation, and composting temp, moisture and other compounds,so there should be different routes to degrade a pesticide than other one. This is why we do research ! Wish you luck.

Some of the Biowaste composting microbes may also react upon the pesticide residues but not on all the pesticides.

During Biowaste composting, generally the pesticides residue will also be reduced by the action of these microbes.

Thank you Dr Aboutayeb for this interesting question. In fact, pesticides in general once used with water and sprayed on crops and soil, are degraded. They're transformed into so called pesticide residues and react differently compared to the initial molecule. The question here to raise is how many pesticide residues could we have into the crop wastes ?and how far could pesticide cocktails be formed ? and how could they react under thermophile and high microbial activity?

So many questions to be raised...

All the best

Khalid Azim

Some pesticides are phosphorous compounds. Whereas, others are organic possess Functional groups viz., a halogen, methoxy, C=O, H-C=O, OH... some long carbonic chain could be a target to micro Flora such as Bacteria and fungi, and macrofuana such as insects. Some of them are uptake in weeds and crops. Others are leaked deeply with groundwater. In contrast, biowastes may either increase toxicity of given pesticides or increase certain pesticides degradiation. Given biowastes consisted from many compounds, biochemicals, organic compounds and hodgepodge chemicals resulted in activation chemical reaction. Consequently, these reaction caused adsoption of some chemicals on colloidal clay surfaces. Some of them persist for a long term in soil and groundwater.

Dear Dr Rachid Aboutayeb . See the following useful RG link: Article Effect of Pesticide Inoculation, Duration of Composting, and...

Kindly see also the following useful RG link: Article Dissipation of pesticides during composting and anaerobic di...

Also check please the following useful RG link: Article Occurrence, Degradation and Fate of Pesticides During Composting

The following RG link is also very useful: Article Comparing straw, compost, and biochar regarding their suitab...

Check please also the following very good RG link: Article The influence of small- and large-scale composting on the di...

Dissipation of pesticides during composting and anaerobic digestion of source-separated organic waste at full-scale plants

As we comparisons of pesticide concentrations before and after composting also showed organochlorine compounds to be most resistant to biodegradation during composting. With some exceptions, pesticides in other categories decomposed moderately well to very well. Other prominent fates include partial degradation to secondary compounds, adsorption, humification, and volatilization. In general the pattern of pesticide degradation during composting is similar to the degradation observed in soils.

Organic waste is any material that is biodegradable and comes from either a plant or an animal. ... Examples of organic waste include green waste, food waste, food-soiled paper, non-hazardous wood waste, green waste, and landscape and pruning waste. The organic material will decompose in the buried solid waste due to the action of microorganisms. At first, the waste aerobically decomposes until the oxygen present in the freshly placed fill is used up by the aerobic microorganisms. However, organic waste in landfills generates, methane, a potent greenhouse gas. By composting wasted food and other organics, methane emissions are significantly reduced. Compost reduces and in some cases eliminates the need for chemical fertilizers. Compost promotes higher yields of agricultural crops.

Thanks Mr. Aboutayeb for this question. The same issue arises from the anaerobic digestion of organic wastes (biowastes and manure). This work deals with this subject:

https://reader.elsevier.com/reader/sd/pii/S0304389420316204?token=70758B81DAF26B8D9725E2BC63EB4D60CCFD6CF7E8A938EADAC066EA7994AB79C94EF742E83ED7D51A343DDE59CF94FE&originRegion=eu-west-1&originCreation=20220227212823